Created attachment 297549 [details] log0 ================================================================== BUG: KASAN: use-after-free in kthread_stop+0x33/0x370 Write of size 4 at addr ffff8880308eade8 by task syz-executor.3/402 EXT4-fs (loop7): mount failed CPU: 0 PID: 402 Comm: syz-executor.3 Not tainted 5.13.0-rc3+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace: dump_stack+0xaf/0xf2 print_address_description.constprop.8+0x1a/0x150 kasan_report.cold.13+0x7f/0x111 kasan_check_range+0x198/0x200 kthread_stop+0x33/0x370 ext4_put_super+0x7a4/0xce0 generic_shutdown_super+0x14a/0x370 kill_block_super+0x94/0xe0 deactivate_locked_super+0x7f/0xe0 deactivate_super+0xb2/0xc0 cleanup_mnt+0x2ec/0x450 task_work_run+0x101/0x1a0 exit_to_user_mode_prepare+0x132/0x140 syscall_exit_to_user_mode+0x12/0x20 do_syscall_64+0x48/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46b1b7 Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd5db62af8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000046b1b7 RDX: 0000000000404502 RSI: 0000000000000002 RDI: 00007ffd5db62bc0 RBP: 00007ffd5db62bc0 R08: 00000000032b0083 R09: 000000000000000b R10: 00000000fffffffb R11: 0000000000000246 R12: 00000000004d17aa R13: 00007ffd5db63c70 R14: 0000000000000004 R15: 0000000000000032 Allocated by task 2: kasan_save_stack+0x19/0x40 __kasan_slab_alloc+0x68/0x80 kmem_cache_alloc_node+0xd3/0x200 copy_process+0x174e/0x66e0 kernel_clone+0xbd/0x950 kernel_thread+0xa7/0xe0 kthreadd+0x3c8/0x520 ret_from_fork+0x22/0x30 Freed by task 12813: kasan_save_stack+0x19/0x40 kasan_set_track+0x1c/0x30 kasan_set_free_info+0x20/0x30 __kasan_slab_free+0xe2/0x110 kmem_cache_free+0x77/0x280 __put_task_struct+0x22a/0x4f0 delayed_put_task_struct+0x120/0x160 rcu_core+0x555/0x14e0 __do_softirq+0x17f/0x578 Last potentially related work creation: kasan_save_stack+0x19/0x40 kasan_record_aux_stack+0xa3/0xb0 call_rcu+0x76/0xac0 put_task_struct_rcu_user+0x61/0x90 finish_task_switch+0x48a/0x670 __schedule+0x873/0x18f0 preempt_schedule_common+0x16/0x50 __cond_resched+0x18/0x20 write_mmp_block+0x308/0x580 kmmpd+0x3e5/0x990 kthread+0x32a/0x3f0 ret_from_fork+0x22/0x30 Second to last potentially related work creation: kasan_save_stack+0x19/0x40 kasan_record_aux_stack+0xa3/0xb0 call_rcu+0x76/0xac0 put_task_struct_rcu_user+0x61/0x90 finish_task_switch+0x48a/0x670 __schedule+0x873/0x18f0 schedule+0xb8/0x250 exit_to_user_mode_prepare+0x97/0x140 irqentry_exit_to_user_mode+0x5/0x20 asm_sysvec_apic_timer_interrupt+0x12/0x20 The buggy address belongs to the object at ffff8880308eadc0 which belongs to the cache task_struct of size 3776 The buggy address is located 40 bytes inside of 3776-byte region [ffff8880308eadc0, ffff8880308ebc80) The buggy address belongs to the page: page:00000000af281d24 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880308e8f40 pfn:0x308e8 head:00000000af281d24 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=1) raw: 0100000000010200 0000000000000000 0000000100000001 ffff88800112cdc0 raw: ffff8880308e8f40 0000000080080006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880308eac80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880308ead00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8880308ead80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff8880308eae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880308eae80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 402 at lib/refcount.c:25 refcount_warn_saturate+0x130/0x1a0 Modules linked in: CPU: 0 PID: 402 Comm: syz-executor.3 Tainted: G B 5.13.0-rc3+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x130/0x1a0 Code: e8 35 1e 66 ff 80 3d b9 2e de 02 00 0f 85 59 ff ff ff e8 23 1e 66 ff 48 c7 c7 40 41 36 ba c6 05 a0 2e de 02 01 e8 e9 5b 98 01 <0f> 0b e9 3a ff ff ff e8 04 1e 66 ff 80 3d 8a 2e de 02 00 0f 85 28 RSP: 0018:ffff88802ea0fd70 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffffb784f048 RDX: ffff888003215b80 RSI: 0000000000000000 RDI: ffff88806d22622c RBP: ffff8880308eade8 R08: ffffed100da45cbb R09: ffffed100da45cbb R10: ffff88806d22e5d7 R11: ffffed100da45cba R12: ffff8880308eade8 R13: 0000000000000000 R14: ffff888001c7e270 R15: dffffc0000000000 FS: 00000000032ae940(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000032b0000 CR3: 000000002e9f6001 CR4: 0000000000370ef0 Call Trace: kthread_stop+0x320/0x370 ext4_put_super+0x7a4/0xce0 generic_shutdown_super+0x14a/0x370 kill_block_super+0x94/0xe0 deactivate_locked_super+0x7f/0xe0 deactivate_super+0xb2/0xc0 cleanup_mnt+0x2ec/0x450 task_work_run+0x101/0x1a0 exit_to_user_mode_prepare+0x132/0x140 syscall_exit_to_user_mode+0x12/0x20 do_syscall_64+0x48/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46b1b7 Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd5db62af8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000046b1b7 RDX: 0000000000404502 RSI: 0000000000000002 RDI: 00007ffd5db62bc0 RBP: 00007ffd5db62bc0 R08: 00000000032b0083 R09: 000000000000000b R10: 00000000fffffffb R11: 0000000000000246 R12: 00000000004d17aa R13: 00007ffd5db63c70 R14: 0000000000000004 R15: 0000000000000032 ---[ end trace 852a0a8b5201e68c ]--- loop2: detected capacity change from 0 to 4096 Quota error (device loop2): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop2): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop2): mount failed loop6: detected capacity change from 0 to 545 loop4: detected capacity change from 0 to 544 EXT4-fs error (device loop4): ext4_quota_enable:6432: comm syz-executor.4: Bad quota inode # 3 EXT4-fs warning (device loop4): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-116). Please run e2fsck to fix. EXT4-fs (loop4): mount failed loop1: detected capacity change from 0 to 544 ext4 filesystem being mounted at /syzkaller-testdir919013516/syzkaller.s42ayS/269/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop6): re-mounted. Opts: (null). Quota mode: writeback. loop6: detected capacity change from 0 to 545 loop7: detected capacity change from 0 to 544 EXT4-fs error (device loop7): ext4_quota_enable:6432: comm syz-executor.7: Bad quota inode # 3 EXT4-fs warning (device loop7): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-116). Please run e2fsck to fix. loop2: detected capacity change from 0 to 4096 EXT4-fs error (device loop1): ext4_quota_enable:6432: comm syz-executor.1: Bad quota inode # 3 EXT4-fs warning (device loop1): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-116). Please run e2fsck to fix. loop4: detected capacity change from 0 to 544 EXT4-fs (loop1): mount failed EXT4-fs (loop7): mount failed ext4 filesystem being mounted at /syzkaller-testdir919013516/syzkaller.s42ayS/270/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop6): re-mounted. Opts: (null). Quota mode: writeback. Quota error (device loop2): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs error (device loop4): ext4_quota_enable:6432: comm syz-executor.4: Bad quota inode # 3 EXT4-fs warning (device loop4): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-116). Please run e2fsck to fix. EXT4-fs warning (device loop2): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs (loop2): mount failed general protection fault, probably for non-canonical address 0xc823ddfe220008: 0000 [#1] SMP KASAN PTI CPU: 0 PID: 12905 Comm: systemd-udevd Tainted: G B W 5.13.0-rc3+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 RIP: 0010:qlist_free_all+0x8d/0xd0 Code: 85 db 75 cf b8 00 00 00 80 48 01 f0 72 53 4c 89 fa 48 2b 15 3d c2 c2 02 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 1b c2 c2 02 <48> 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 78 18 eb 94 49 RSP: 0018:ffff888003cbf700 EFLAGS: 00010207 RAX: 00c823ddfe220000 RBX: 0000000000000000 RCX: 0000000000080006 RDX: 0000777f80000000 RSI: 320dffff888004dc RDI: 0000000000000000 RBP: 320dffff888004dc R08: 0000000000000000 R09: ffffffffb7be1f00 R10: ffff8880308eadc2 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffffffb7be1f36 R14: ffff888003cbf738 R15: ffffffff80000000 FS: 00007f3e9659c8c0(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc4c53aea7 CR3: 0000000008c8a006 CR4: 0000000000370ef0 Call Trace: kasan_quarantine_reduce+0x117/0x140 __kasan_slab_alloc+0x7a/0x80 kmem_cache_alloc_node+0xd3/0x200 __alloc_skb+0x201/0x320 alloc_skb_with_frags+0x87/0x4b0 sock_alloc_send_pskb+0x68b/0x7f0 unix_dgram_sendmsg+0x38d/0x12c0 sock_sendmsg+0x132/0x170 sock_write_iter+0x241/0x390 new_sync_write+0x418/0x5c0 vfs_write+0x445/0x730 ksys_write+0x1ac/0x1f0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3e956e31b0 Code: 2e 0f 1f 84 00 00 00 00 00 90 48 8b 05 19 7e 20 00 c3 0f 1f 84 00 00 00 00 00 83 3d 19 c2 20 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 RSP: 002b:00007ffc4c53d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00005569587229f0 RCX: 00007f3e956e31b0 RDX: 0000000000000000 RSI: 00007ffc4c53d0f0 RDI: 0000000000000008 RBP: 00007ffc4c53d1b0 R08: 00005569587210a4 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffc4c53d100 R13: 000055695871d7e0 R14: 0000000000000003 R15: 000000000000000e Modules linked in: ---[ end trace 852a0a8b5201e68d ]--- RIP: 0010:qlist_free_all+0x8d/0xd0 Code: 85 db 75 cf b8 00 00 00 80 48 01 f0 72 53 4c 89 fa 48 2b 15 3d c2 c2 02 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 1b c2 c2 02 <48> 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 78 18 eb 94 49 RSP: 0018:ffff888003cbf700 EFLAGS: 00010207 RAX: 00c823ddfe220000 RBX: 0000000000000000 RCX: 0000000000080006 RDX: 0000777f80000000 RSI: 320dffff888004dc RDI: 0000000000000000 RBP: 320dffff888004dc R08: 0000000000000000 R09: ffffffffb7be1f00 R10: ffff8880308eadc2 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffffffb7be1f36 R14: ffff888003cbf738 R15: ffffffff80000000
Created attachment 297551 [details] report0
This bug can be repro, if you need it, please tell me. Thanks
Created attachment 297611 [details] kernel config
And the poc also can cause another BUG sometimes: BUG: KASAN: double-free or invalid-free in __put_task_struct+0x22a/0x4f0. The log is as follow. [ 25.942673] ================================================================== [ 25.944029] BUG: KASAN: double-free or invalid-free in __put_task_struct+0x22a/0x4f0 [ 25.945550] [ 25.945872] CPU: 0 PID: 336 Comm: poc Tainted: G B D W 5.13.0-rc3+ #2 [ 25.947304] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 25.948439] ext4 filesystem being mounted at /root/syzkaller.OKJyCQ/24/file0 supports timestamps until 2038 (0x7fffffff) [ 25.949472] Call Trace: [ 25.949476] dump_stack+0xaf/0xf2 [ 25.949483] print_address_description.constprop.8+0x1a/0x150 [ 25.949490] ? __put_task_struct+0x22a/0x4f0 [ 25.949495] kasan_report_invalid_free+0x50/0x80 [ 25.949500] ? __put_task_struct+0x22a/0x4f0 [ 25.949505] __kasan_slab_free+0xfe/0x110 [ 25.949528] ? __put_task_struct+0x22a/0x4f0 [ 25.949532] kmem_cache_free+0x77/0x280 [ 25.958044] EXT4-fs (loop4): re-mounted. Opts: (null). Quota mode: writeback. [ 25.959010] __put_task_struct+0x22a/0x4f0 [ 25.959031] kthread_stop+0x2cf/0x370 [ 25.959036] destroy_workqueue+0xff/0x700 [ 25.959041] ? ext4_quota_write+0x600/0x600 [ 25.959046] ext4_put_super+0xdb/0xce0 [ 25.959050] ? ext4_quota_write+0x600/0x600 [ 25.959054] generic_shutdown_super+0x14a/0x370 [ 25.959059] kill_block_super+0x94/0xe0 [ 25.959064] deactivate_locked_super+0x7f/0xe0 [ 25.959069] deactivate_super+0xb2/0xc0 [ 25.970853] cleanup_mnt+0x2ec/0x450 [ 25.971622] task_work_run+0x101/0x1a0 [ 25.972437] exit_to_user_mode_prepare+0x132/0x140 [ 25.973434] syscall_exit_to_user_mode+0x12/0x20 [ 25.974330] do_syscall_64+0x48/0x80 [ 25.975106] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 25.976128] RIP: 0033:0x7f1c1389fd77 [ 25.976898] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48 [ 25.980943] RSP: 002b:00007fffa72c1428 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 [ 25.982628] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f1c1389fd77 [ 25.984122] RDX: 00007fffa72c150a RSI: 0000000000000002 RDI: 00007fffa72c1500 [ 25.985529] RBP: 00007fffa72c2510 R08: 000055b1e31fd083 R09: 000000000000000a [ 25.987042] R10: 0000000000000073 R11: 0000000000000206 R12: 000055b1e1c010b0 [ 25.988471] R13: 00007fffa72c2660 R14: 0000000000000000 R15: 0000000000000000 [ 25.989922] [ 25.990300] Allocated by task 131072: [ 25.991327] ------------[ cut here ]------------ [ 25.992295] slab index 131072 out of bounds (119) for stack id 00020000 [ 25.993720] WARNING: CPU: 0 PID: 336 at lib/stackdepot.c:237 stack_depot_fetch+0x5d/0x70 [ 25.995543] Modules linked in: [ 25.996309] CPU: 0 PID: 336 Comm: poc Tainted: G B D W 5.13.0-rc3+ #2 [ 25.997974] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 26.000094] RIP: 0010:stack_depot_fetch+0x5d/0x70 [ 26.001017] Code: 74 2d 48 c1 e0 04 25 f0 3f 00 00 48 01 d0 48 8d 50 18 48 89 16 8b 40 0c c3 89 f9 44 89 c6 48 c7 c7 d0 47 fb 87 e8 1c b6 8e 01 <0f> 0b 31 c0 c3 31 c0 c3 90 66 2e 0f 1f 84 00 00 00 00 00 48 63 15 [ 26.004698] RSP: 0018:ffff8880088bfc50 EFLAGS: 00010086 [ 26.005798] RAX: 0000000000000000 RBX: ffff8880075d8e02 RCX: ffffffff8504f048 [ 26.007441] RDX: ffff888001868000 RSI: 0000000000000000 RDI: ffff888068c1f598 [ 26.009075] RBP: ffffea00001d7600 R08: ffffed100d183eb4 R09: ffffed100d183eb4 [ 26.010611] R10: ffff888068c1f59b R11: ffffed100d183eb3 R12: ffff88800112cdc0 [ 26.012196] R13: ffff8880075d8e00 R14: ffff8880075d9b80 R15: 0000000000000000 [ 26.013861] FS: 00007f1c13d74480(0000) GS:ffff888068c00000(0000) knlGS:0000000000000000 [ 26.015540] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.016872] CR2: 00007ffc569bbcd7 CR3: 0000000008810000 CR4: 00000000000006f0 [ 26.018480] Call Trace: [ 26.019002] print_stack+0x9/0x18 [ 26.019737] print_address_description.constprop.8.cold.12+0x185/0x18a [ 26.021019] ? __put_task_struct+0x22a/0x4f0 [ 26.021976] kasan_report_invalid_free+0x50/0x80 [ 26.022911] ? __put_task_struct+0x22a/0x4f0 [ 26.023805] __kasan_slab_free+0xfe/0x110 [ 26.024598] ? __put_task_struct+0x22a/0x4f0 [ 26.025502] kmem_cache_free+0x77/0x280 [ 26.026293] __put_task_struct+0x22a/0x4f0 [ 26.027094] kthread_stop+0x2cf/0x370 [ 26.027827] destroy_workqueue+0xff/0x700 [ 26.028729] ? ext4_quota_write+0x600/0x600 [ 26.029851] ext4_put_super+0xdb/0xce0 [ 26.030690] ? ext4_quota_write+0x600/0x600 [ 26.031724] generic_shutdown_super+0x14a/0x370 [ 26.032753] kill_block_super+0x94/0xe0 [ 26.033593] deactivate_locked_super+0x7f/0xe0 [ 26.034426] deactivate_super+0xb2/0xc0 [ 26.035226] cleanup_mnt+0x2ec/0x450 [ 26.035964] task_work_run+0x101/0x1a0 [ 26.036711] exit_to_user_mode_prepare+0x132/0x140 [ 26.037644] syscall_exit_to_user_mode+0x12/0x20 [ 26.038541] do_syscall_64+0x48/0x80 [ 26.039299] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.040245] RIP: 0033:0x7f1c1389fd77 [ 26.040952] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48 [ 26.044786] RSP: 002b:00007fffa72c1428 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 [ 26.046353] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f1c1389fd77 [ 26.047859] RDX: 00007fffa72c150a RSI: 0000000000000002 RDI: 00007fffa72c1500 [ 26.049397] RBP: 00007fffa72c2510 R08: 000055b1e31fd083 R09: 000000000000000a [ 26.051028] R10: 0000000000000073 R11: 0000000000000206 R12: 000055b1e1c010b0 [ 26.052424] R13: 00007fffa72c2660 R14: 0000000000000000 R15: 0000000000000000 [ 26.053764] ---[ end trace d8fc4879a76a1704 ]--- [ 26.054669] ------------[ cut here ]------------ [ 26.055673] WARNING: CPU: 0 PID: 336 at kernel/stacktrace.c:28 stack_trace_print+0x16/0x20 [ 26.057321] Modules linked in: [ 26.057960] CPU: 0 PID: 336 Comm: poc Tainted: G B D W 5.13.0-rc3+ #2 [ 26.059328] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 26.061085] RIP: 0010:stack_trace_print+0x16/0x20 [ 26.061987] Code: 00 00 75 06 48 83 c4 60 5b c3 e8 e5 50 4b 02 0f 1f 44 00 00 41 55 41 54 55 53 48 85 ff 74 0b 85 f6 75 0b 5b 5d 41 5c 41 5d c3 <0f> 0b eb f5 e9 37 44 40 02 90 41 57 41 56 41 55 41 54 55 53 48 83 [ 26.065636] RSP: 0018:ffff8880088bfc30 EFLAGS: 00010046 [ 26.066639] RAX: 0000000000000000 RBX: ffff8880075d8e02 RCX: ffffffff8504f048 [ 26.068078] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.069440] RBP: ffffea00001d7600 R08: ffffed100d183eb4 R09: ffffed100d183eb4 [ 26.071029] R10: ffff888068c1f59b R11: ffffed100d183eb3 R12: ffff88800112cdc0 [ 26.072404] R13: ffff8880075d8e00 R14: ffff8880075d9b80 R15: 0000000000000000 [ 26.074029] FS: 00007f1c13d74480(0000) GS:ffff888068c00000(0000) knlGS:0000000000000000 [ 26.075887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.077192] CR2: 00007ffc569bbcd7 CR3: 0000000008810000 CR4: 00000000000006f0 [ 26.078700] Call Trace: [ 26.079225] print_stack+0x16/0x18 [ 26.079906] print_address_description.constprop.8.cold.12+0x185/0x18a [ 26.081193] ? __put_task_struct+0x22a/0x4f0 [ 26.082049] kasan_report_invalid_free+0x50/0x80 [ 26.082957] ? __put_task_struct+0x22a/0x4f0 [ 26.083799] __kasan_slab_free+0xfe/0x110 [ 26.084603] ? __put_task_struct+0x22a/0x4f0 [ 26.085479] kmem_cache_free+0x77/0x280 [ 26.086284] __put_task_struct+0x22a/0x4f0 [ 26.087056] kthread_stop+0x2cf/0x370 [ 26.087806] destroy_workqueue+0xff/0x700 [ 26.088556] ? ext4_quota_write+0x600/0x600 [ 26.089397] ext4_put_super+0xdb/0xce0 [ 26.090374] ? ext4_quota_write+0x600/0x600 [ 26.091299] generic_shutdown_super+0x14a/0x370 [ 26.092227] kill_block_super+0x94/0xe0 [ 26.092945] deactivate_locked_super+0x7f/0xe0 [ 26.093835] deactivate_super+0xb2/0xc0 [ 26.094663] cleanup_mnt+0x2ec/0x450 [ 26.095389] task_work_run+0x101/0x1a0 [ 26.096137] exit_to_user_mode_prepare+0x132/0x140 [ 26.097104] syscall_exit_to_user_mode+0x12/0x20 [ 26.098144] do_syscall_64+0x48/0x80 [ 26.098849] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.099909] RIP: 0033:0x7f1c1389fd77 [ 26.100749] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48 [ 26.104349] RSP: 002b:00007fffa72c1428 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 [ 26.105947] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f1c1389fd77 [ 26.107476] RDX: 00007fffa72c150a RSI: 0000000000000002 RDI: 00007fffa72c1500 [ 26.108963] RBP: 00007fffa72c2510 R08: 000055b1e31fd083 R09: 000000000000000a [ 26.110389] R10: 0000000000000073 R11: 0000000000000206 R12: 000055b1e1c010b0 [ 26.111832] R13: 00007fffa72c2660 R14: 0000000000000000 R15: 0000000000000000 [ 26.113173] ---[ end trace d8fc4879a76a1705 ]--- [ 26.114104] [ 26.114411] Last potentially related work creation: [ 26.115400] kasan_save_stack+0x19/0x40 [ 26.116078] kasan_record_aux_stack+0xa3/0xb0 [ 26.116964] call_rcu+0x76/0xac0 [ 26.117646] put_task_struct_rcu_user+0x61/0x90 [ 26.118554] finish_task_switch+0x48a/0x670 [ 26.119366] __schedule+0x873/0x18f0 [ 26.120116] preempt_schedule_common+0x16/0x50 [ 26.121022] __cond_resched+0x18/0x20 [ 26.121867] wait_for_completion+0x69/0x260 [ 26.122774] kthread_stop+0xf1/0x370 [ 26.123470] destroy_workqueue+0xff/0x700 [ 26.124307] ext4_put_super+0xdb/0xce0 [ 26.125078] generic_shutdown_super+0x14a/0x370 [ 26.125959] kill_block_super+0x94/0xe0 [ 26.126758] deactivate_locked_super+0x7f/0xe0 [ 26.127618] deactivate_super+0xb2/0xc0 [ 26.128299] cleanup_mnt+0x2ec/0x450 [ 26.128958] task_work_run+0x101/0x1a0 [ 26.129690] exit_to_user_mode_prepare+0x132/0x140 [ 26.130709] syscall_exit_to_user_mode+0x12/0x20 [ 26.131670] do_syscall_64+0x48/0x80 [ 26.132349] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.133458] [ 26.133856] Second to last potentially related work creation: [ 26.135165] ------------[ cut here ]------------ [ 26.136254] slab index 41440 out of bounds (119) for stack id e2a0a1e0 [ 26.137534] WARNING: CPU: 0 PID: 336 at lib/stackdepot.c:237 stack_depot_fetch+0x5d/0x70 [ 26.139039] Modules linked in: [ 26.139778] CPU: 0 PID: 336 Comm: poc Tainted: G B D W 5.13.0-rc3+ #2 [ 26.141483] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 26.143417] RIP: 0010:stack_depot_fetch+0x5d/0x70 [ 26.144331] Code: 74 2d 48 c1 e0 04 25 f0 3f 00 00 48 01 d0 48 8d 50 18 48 89 16 8b 40 0c c3 89 f9 44 89 c6 48 c7 c7 d0 47 fb 87 e8 1c b6 8e 01 <0f> 0b 31 c0 c3 31 c0 c3 90 66 2e 0f 1f 84 00 00 00 00 00 48 63 15 [ 26.147905] RSP: 0018:ffff8880088bfc50 EFLAGS: 00010086 [ 26.148949] RAX: 0000000000000000 RBX: ffff8880075d8e02 RCX: ffffffff8504f048 [ 26.150298] RDX: ffff888001868000 RSI: 0000000000000000 RDI: ffff888068c1f598 [ 26.151800] RBP: ffffea00001d7600 R08: ffffed100d183eb4 R09: ffffed100d183eb4 [ 26.153203] R10: ffff888068c1f59b R11: ffffed100d183eb3 R12: ffff88800112cdc0 [ 26.154663] R13: ffff8880075d8e00 R14: ffff8880075d9b80 R15: 0000000000000000 [ 26.156163] FS: 00007f1c13d74480(0000) GS:ffff888068c00000(0000) knlGS:0000000000000000 [ 26.157652] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.158793] CR2: 00007ffc569bbcd7 CR3: 0000000008810000 CR4: 00000000000006f0 [ 26.160229] Call Trace: [ 26.160772] print_stack+0x9/0x18 [ 26.161550] print_address_description.constprop.8.cold.12+0x12b/0x18a [ 26.162872] ? __put_task_struct+0x22a/0x4f0 [ 26.163770] kasan_report_invalid_free+0x50/0x80 [ 26.164760] ? __put_task_struct+0x22a/0x4f0 [ 26.165614] __kasan_slab_free+0xfe/0x110 [ 26.166382] ? __put_task_struct+0x22a/0x4f0 [ 26.167213] kmem_cache_free+0x77/0x280 [ 26.167915] __put_task_struct+0x22a/0x4f0 [ 26.168732] kthread_stop+0x2cf/0x370 [ 26.169485] destroy_workqueue+0xff/0x700 [ 26.170300] ? ext4_quota_write+0x600/0x600 [ 26.171151] ext4_put_super+0xdb/0xce0 [ 26.171893] ? ext4_quota_write+0x600/0x600 [ 26.172721] generic_shutdown_super+0x14a/0x370 [ 26.173628] kill_block_super+0x94/0xe0 [ 26.174366] deactivate_locked_super+0x7f/0xe0 [ 26.175283] deactivate_super+0xb2/0xc0 [ 26.176021] cleanup_mnt+0x2ec/0x450 [ 26.176698] task_work_run+0x101/0x1a0 [ 26.177432] exit_to_user_mode_prepare+0x132/0x140 [ 26.178462] syscall_exit_to_user_mode+0x12/0x20 [ 26.179371] do_syscall_64+0x48/0x80 [ 26.180145] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.181364] RIP: 0033:0x7f1c1389fd77 [ 26.182104] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48 [ 26.185719] RSP: 002b:00007fffa72c1428 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 [ 26.187183] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f1c1389fd77 [ 26.188577] RDX: 00007fffa72c150a RSI: 0000000000000002 RDI: 00007fffa72c1500 [ 26.190070] RBP: 00007fffa72c2510 R08: 000055b1e31fd083 R09: 000000000000000a [ 26.191547] R10: 0000000000000073 R11: 0000000000000206 R12: 000055b1e1c010b0 [ 26.193007] R13: 00007fffa72c2660 R14: 0000000000000000 R15: 0000000000000000 [ 26.194514] ---[ end trace d8fc4879a76a1706 ]--- [ 26.195530] ------------[ cut here ]------------ [ 26.196570] WARNING: CPU: 0 PID: 336 at kernel/stacktrace.c:28 stack_trace_print+0x16/0x20 [ 26.198604] Modules linked in: [ 26.199275] CPU: 0 PID: 336 Comm: poc Tainted: G B D W 5.13.0-rc3+ #2 [ 26.200824] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 26.202582] RIP: 0010:stack_trace_print+0x16/0x20 [ 26.203443] Code: 00 00 75 06 48 83 c4 60 5b c3 e8 e5 50 4b 02 0f 1f 44 00 00 41 55 41 54 55 53 48 85 ff 74 0b 85 f6 75 0b 5b 5d 41 5c 41 5d c3 <0f> 0b eb f5 e9 37 44 40 02 90 41 57 41 56 41 55 41 54 55 53 48 83 [ 26.207062] RSP: 0018:ffff8880088bfc30 EFLAGS: 00010046 [ 26.208146] RAX: 0000000000000000 RBX: ffff8880075d8e02 RCX: ffffffff8504f048 [ 26.209688] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.211005] RBP: ffffea00001d7600 R08: ffffed100d183eb4 R09: ffffed100d183eb4 [ 26.212375] R10: ffff888068c1f59b R11: ffffed100d183eb3 R12: ffff88800112cdc0 [ 26.214077] R13: ffff8880075d8e00 R14: ffff8880075d9b80 R15: 0000000000000000 [ 26.215431] FS: 00007f1c13d74480(0000) GS:ffff888068c00000(0000) knlGS:0000000000000000 [ 26.216898] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.217980] CR2: 00007ffc569bbcd7 CR3: 0000000008810000 CR4: 00000000000006f0 [ 26.219375] Call Trace: [ 26.219931] print_stack+0x16/0x18 [ 26.220621] print_address_description.constprop.8.cold.12+0x12b/0x18a [ 26.222082] ? __put_task_struct+0x22a/0x4f0 [ 26.223018] kasan_report_invalid_free+0x50/0x80 [ 26.223902] ? __put_task_struct+0x22a/0x4f0 [ 26.224850] __kasan_slab_free+0xfe/0x110 [ 26.225682] ? __put_task_struct+0x22a/0x4f0 [ 26.226662] kmem_cache_free+0x77/0x280 [ 26.227496] __put_task_struct+0x22a/0x4f0 [ 26.228348] kthread_stop+0x2cf/0x370 [ 26.229216] destroy_workqueue+0xff/0x700 [ 26.230125] ? ext4_quota_write+0x600/0x600 [ 26.231218] ext4_put_super+0xdb/0xce0 [ 26.232073] ? ext4_quota_write+0x600/0x600 [ 26.233026] generic_shutdown_super+0x14a/0x370 [ 26.233985] kill_block_super+0x94/0xe0 [ 26.234790] deactivate_locked_super+0x7f/0xe0 [ 26.235624] deactivate_super+0xb2/0xc0 [ 26.236420] cleanup_mnt+0x2ec/0x450 [ 26.237129] task_work_run+0x101/0x1a0 [ 26.237977] exit_to_user_mode_prepare+0x132/0x140 [ 26.238961] syscall_exit_to_user_mode+0x12/0x20 [ 26.239822] do_syscall_64+0x48/0x80 [ 26.240574] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 26.241829] RIP: 0033:0x7f1c1389fd77 [ 26.242562] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48 [ 26.246192] RSP: 002b:00007fffa72c1428 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 [ 26.247587] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f1c1389fd77 [ 26.248997] RDX: 00007fffa72c150a RSI: 0000000000000002 RDI: 00007fffa72c1500 [ 26.250314] RBP: 00007fffa72c2510 R08: 000055b1e31fd083 R09: 000000000000000a [ 26.251786] R10: 0000000000000073 R11: 0000000000000206 R12: 000055b1e1c010b0 [ 26.253364] R13: 00007fffa72c2660 R14: 0000000000000000 R15: 0000000000000000 [ 26.254782] ---[ end trace d8fc4879a76a1707 ]--- [ 26.255930] [ 26.256317] The buggy address belongs to the object at ffff8880075d8e00 [ 26.256317] which belongs to the cache task_struct of size 3456 [ 26.259145] The buggy address is located 2 bytes inside of [ 26.259145] 3456-byte region [ffff8880075d8e00, ffff8880075d9b80) [ 26.261404] The buggy address belongs to the page: [ 26.262356] page:0000000055a51e09 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880075df000 pfn:0x75d8 [ 26.264348] head:0000000055a51e09 order:3 compound_mapcount:0 compound_pincount:0 [ 26.265713] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 26.266858] raw: 0100000000010200 ffffea0000257600 0000000200000002 ffff88800112cdc0 [ 26.268227] raw: ffff8880075df000 0000000080090006 00000001ffffffff 0000000000000000 [ 26.269902] page dumped because: kasan: bad access detected [ 26.270960] [ 26.271272] Memory state around the buggy address: [ 26.272370] ffff8880075d8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.273911] ffff8880075d8d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.275314] >ffff8880075d8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.276673] ^ [ 26.277327] ffff8880075d8e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.278712] ffff8880075d8f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.280176] ==================================================================