Created attachment 300845 [details]
case.c

I have encountered a F2FS bug in the kernel v5.17.

This bug can be reproduced by running the following commands:
losetup /dev/loop0 case.img
mount -o "background_gc=off,no_heap,noacl,inline_dentry,flush_merge,test_dummy_encryption,test_dummy_encryption" /dev/loop0 /mnt/test/
gcc -o case case.c
./case

The system call sequence is in case.c, and the modified image can be found at (https://drive.google.com/file/d/1NJPVAObap1fuhCCbaAF0YacDuoc1LRxo/view?usp=sharing).

The kernel message is shown below:

6,811,176146014,-;loop0: detected capacity change from 0 to 131072
4,812,176177760,-;F2FS-fs (loop0): Test dummy encryption mount option ignored
4,813,176177773,-;F2FS-fs (loop0): Test dummy encryption mount option ignored
5,814,176180172,-;F2FS-fs (loop0): Disable nat_bits due to incorrect cp_ver (9632544162839053021, 5086346976812384983)
5,815,176207578,-;F2FS-fs (loop0): Mounted with checkpoint version = 7548c2dd
4,816,176363509,-;------------[ cut here ]------------
2,817,176363515,-;kernel BUG at fs/f2fs/segment.c:2560!
4,818,176363524,-;invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
4,819,176363528,-;CPU: 5 PID: 90 Comm: kworker/u16:2 Not tainted 5.17.0 #5
4,820,176363532,-;Hardware name: Dell Inc. OptiPlex 9020/03CPWF, BIOS A14 09/14/2015
4,821,176363535,-;Workqueue: writeback wb_workfn (flush-7:0)
4,822,176363543,-;RIP: 0010:new_curseg+0xe8d/0x15f0
4,823,176363548,-;Code: 45 0c 48 89 44 24 38 e9 2d f4 ff ff 89 e8 31 d2 41 89 ef f7 b3 58 04 00 00 31 d2 89 c1 f7 f6 89 cd 89 44 24 70 e9 0f f4 ff ff <0f> 0b e8 dc 56 1f 00 48 8d bb 08 0a 00 00 48 ba 00 00 00 00 00 fc
4,824,176363551,-;RSP: 0018:ffff888109ea6738 EFLAGS: 00010246
4,825,176363555,-;RAX: 0000000000000018 RBX: ffff888145c2c000 RCX: 0000000000000018
4,826,176363557,-;RDX: 0000000000000000 RSI: 0000000000000018 RDI: ffff888101a9be90
4,827,176363559,-;RBP: ffffed1028b8588c R08: ffff888101a9be88 R09: 0000000000000000
4,828,176363561,-;R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
4,829,176363563,-;R13: ffff888101100dc0 R14: dffffc0000000000 R15: ffffed10202201bb
4,830,176363566,-;FS:  0000000000000000(0000) GS:ffff8881d5740000(0000) knlGS:0000000000000000
4,831,176363568,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4,832,176363571,-;CR2: 00007f8dd8ecd0a0 CR3: 0000000159e10005 CR4: 00000000001706e0
4,833,176363573,-;Call Trace:
4,834,176363575,-; <TASK>
4,835,176363578,-; allocate_segment_by_default+0x228/0x440
4,836,176363582,-; f2fs_allocate_data_block+0x13d1/0x31f0
4,837,176363587,-; ? _raw_spin_lock_irqsave+0x88/0xe0
4,838,176363592,-; do_write_page+0x18d/0x710
4,839,176363596,-; f2fs_outplace_write_data+0x151/0x250
4,840,176363599,-; ? f2fs_do_write_node_page+0x110/0x110
4,841,176363602,-; ? __xa_set_mark+0xa8/0xf0
4,842,176363607,-; f2fs_do_write_data_page+0xef9/0x1980
4,843,176363611,-; ? f2fs_should_update_outplace+0x4f0/0x4f0
4,844,176363615,-; ? folio_mkclean+0xc9/0x150
4,845,176363621,-; ? percpu_counter_add_batch+0x79/0x130
4,846,176363625,-; move_data_page+0x6af/0xbc0
4,847,176363628,-; ? rwsem_down_read_slowpath+0x880/0x880
4,848,176363632,-; ? add_gc_inode+0x240/0x240
4,849,176363635,-; ? _raw_spin_unlock+0x34/0x60
4,850,176363639,-; ? down_write_trylock+0xa0/0x110
4,851,176363643,-; ? down_read_trylock+0x1c0/0x1c0
4,852,176363646,-; ? __get_node_page+0x13c/0xd30
4,853,176363649,-; do_garbage_collect+0x312f/0x46f0
4,854,176363654,-; ? move_data_page+0xbc0/0xbc0
4,855,176363657,-; ? move_data_block+0x22d0/0x22d0
4,856,176363661,-; f2fs_gc+0x6b0/0x3bc0
4,857,176363665,-; ? f2fs_start_bidx_of_node+0x10/0x10
4,858,176363669,-; ? f2fs_inode_chksum_set+0x15/0x130
4,859,176363672,-; ? f2fs_start_bidx_of_node.part.0+0x22f/0x310
4,860,176363676,-; ? down_write+0xa8/0x110
4,861,176363678,-; ? down_write_killable+0x120/0x120
4,862,176363681,-; ? f2fs_outplace_write_data+0x1c4/0x250
4,863,176363685,-; ? f2fs_balance_fs+0x921/0x2260
4,864,176363688,-; f2fs_balance_fs+0x921/0x2260
4,865,176363691,-; ? f2fs_should_update_outplace+0x4f0/0x4f0
4,866,176363695,-; ? __blk_account_io_start+0xe6/0x220
4,867,176363699,-; ? f2fs_balance_fs_bg+0xcd0/0xcd0
4,868,176363703,-; ? _raw_spin_lock+0x82/0xd0
4,869,176363706,-; ? _raw_spin_lock_irqsave+0xe0/0xe0
4,870,176363709,-; ? __unwind_start+0x514/0x7d0
4,871,176363712,-; ? kernel_text_address+0xd/0xb0
4,872,176363717,-; f2fs_write_single_data_page+0x16be/0x2370
4,873,176363721,-; ? submit_bio_checks+0x11e1/0x1240
4,874,176363724,-; ? submit_bio_noacct+0x5c6/0x850
4,875,176363727,-; ? release_pages+0x26f/0xa80
4,876,176363730,-; ? f2fs_do_write_data_page+0x1980/0x1980
4,877,176363734,-; ? invalid_page_referenced_vma+0x10/0x10
4,878,176363738,-; ? percpu_counter_add_batch+0x79/0x130
4,879,176363741,-; f2fs_write_cache_pages+0x428/0xd00
4,880,176363745,-; ? f2fs_write_single_data_page+0x2370/0x2370
4,881,176363749,-; ? nr_blockdev_pages+0xcb/0x100
4,882,176363753,-; ? si_meminfo+0x115/0x230
4,883,176363756,-; ? xas_set_mark+0xf0/0x1c0
4,884,176363760,-; ? __mutex_lock_slowpath+0x10/0x10
4,885,176363763,-; f2fs_write_data_pages+0x96e/0xd50
4,886,176363767,-; ? f2fs_write_cache_pages+0xd00/0xd00
4,887,176363770,-; ? f2fs_inode_synced+0x1e7/0x370
4,888,176363773,-; ? f2fs_set_node_page_dirty+0x1e1/0x7b0
4,889,176363777,-; ? f2fs_balance_fs_bg+0xcd0/0xcd0
4,890,176363780,-; do_writepages+0x168/0x550
4,891,176363783,-; ? page_writeback_cpu_online+0x10/0x10
4,892,176363786,-; ? f2fs_write_inode+0x468/0x1200
4,893,176363789,-; ? _raw_spin_lock+0x82/0xd0
4,894,176363792,-; ? _raw_spin_lock_irqsave+0xe0/0xe0
4,895,176363795,-; __writeback_single_inode+0x9f/0x870
4,896,176363799,-; ? __inode_add_lru+0x56/0x1c0
4,897,176363804,-; writeback_sb_inodes+0x47d/0xb20
4,898,176363808,-; ? _raw_spin_unlock+0x34/0x60
4,899,176363811,-; ? sync_inode_metadata+0xe0/0xe0
4,900,176363814,-; ? down_read_trylock+0x117/0x1c0
4,901,176363818,-; ? __traceiter_sb_clear_inode_writeback+0x90/0x90
4,902,176363822,-; __writeback_inodes_wb+0xb2/0x200
4,903,176363826,-; wb_writeback+0x4bd/0x660
4,904,176363830,-; ? __writeback_inodes_wb+0x200/0x200
4,905,176363834,-; ? get_nr_dirty_inodes+0xa9/0x100
4,906,176363837,-; wb_workfn+0x5f3/0xab0
4,907,176363840,-; ? inode_wait_for_writeback+0x30/0x30
4,908,176363842,-; ? set_next_entity+0x2b7/0x500
4,909,176363846,-; ? dequeue_task_fair+0x2cd/0x14d0
4,910,176363849,-; ? _raw_spin_unlock+0x34/0x60
4,911,176363852,-; ? finish_task_switch+0x1c8/0x680
4,912,176363856,-; ? read_word_at_a_time+0xe/0x20
4,913,176363859,-; ? strscpy+0x96/0x2a0
4,914,176363862,-; process_one_work+0x79f/0x13e0
4,915,176363865,-; worker_thread+0x89/0xf60
4,916,176363869,-; ? __kthread_parkme+0x86/0x150
4,917,176363872,-; ? process_one_work+0x13e0/0x13e0
4,918,176363875,-; kthread+0x26a/0x300
4,919,176363878,-; ? kthread_complete_and_exit+0x20/0x20
4,920,176363880,-; ret_from_fork+0x22/0x30
4,921,176363885,-; </TASK>
4,922,176363886,-;Modules linked in: x86_pkg_temp_thermal efivarfs
4,923,176363893,-;---[ end trace 0000000000000000 ]---
4,924,176363895,-;RIP: 0010:new_curseg+0xe8d/0x15f0
4,925,176363898,-;Code: 45 0c 48 89 44 24 38 e9 2d f4 ff ff 89 e8 31 d2 41 89 ef f7 b3 58 04 00 00 31 d2 89 c1 f7 f6 89 cd 89 44 24 70 e9 0f f4 ff ff <0f> 0b e8 dc 56 1f 00 48 8d bb 08 0a 00 00 48 ba 00 00 00 00 00 fc
4,926,176363901,-;RSP: 0018:ffff888109ea6738 EFLAGS: 00010246
4,927,176363904,-;RAX: 0000000000000018 RBX: ffff888145c2c000 RCX: 0000000000000018
4,928,176363906,-;RDX: 0000000000000000 RSI: 0000000000000018 RDI: ffff888101a9be90
4,929,176363908,-;RBP: ffffed1028b8588c R08: ffff888101a9be88 R09: 0000000000000000
4,930,176363910,-;R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
4,931,176363912,-;R13: ffff888101100dc0 R14: dffffc0000000000 R15: ffffed10202201bb
4,932,176363915,-;FS:  0000000000000000(0000) GS:ffff8881d5740000(0000) knlGS:0000000000000000
4,933,176363917,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4,934,176363919,-;CR2: 00007f8dd8ecd0a0 CR3: 0000000159e10005 CR4: 00000000001706e0
6,935,176363922,-;note: kworker/u16:2[90] exited with preempt_count 1
4,936,176363925,-;------------[ cut here ]------------
4,937,176363926,-;WARNING: CPU: 5 PID: 90 at kernel/exit.c:738 do_exit+0xb8/0x27b0
4,938,176363931,-;Modules linked in: x86_pkg_temp_thermal efivarfs
4,939,176363935,-;CPU: 5 PID: 90 Comm: kworker/u16:2 Tainted: G      D           5.17.0 #5
4,940,176363938,-;Hardware name: Dell Inc. OptiPlex 9020/03CPWF, BIOS A14 09/14/2015
4,941,176363940,-;Workqueue: writeback wb_workfn (flush-7:0)
4,942,176363944,-;RIP: 0010:do_exit+0xb8/0x27b0
4,943,176363947,-;Code: 85 ed 74 28 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b3 21 00 00 48 83 7d 00 00 0f 84 b4 0b 00 00 <0f> 0b 4c 8d ab 90 07 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea
4,944,176363949,-;RSP: 0018:ffff888109ea7e48 EFLAGS: 00010202
4,945,176363952,-;RAX: dffffc0000000000 RBX: ffff888109def000 RCX: 0000000080000000
4,946,176363954,-;RDX: 1ffff110213d4f77 RSI: 0000000000000004 RDI: ffff888109def878
4,947,176363956,-;RBP: ffff888109ea7bb8 R08: 0000000000000033 R09: ffffed103aaece8e
4,948,176363959,-;R10: ffff8881d576746b R11: ffffed103aaece8d R12: 000000000000000b
4,949,176363961,-;R13: ffffffffab21c2e0 R14: ffff888109def000 R15: 0000000000000000
4,950,176363963,-;FS:  0000000000000000(0000) GS:ffff8881d5740000(0000) knlGS:0000000000000000
4,951,176363965,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4,952,176363967,-;CR2: 00007f8dd8ecd0a0 CR3: 0000000159e10005 CR4: 00000000001706e0
4,953,176363970,-;Call Trace:
4,954,176363971,-; <TASK>
4,955,176363973,-; ? _printk+0xad/0xde
4,956,176363977,-; ? swsusp_write.cold+0x39b/0x39b
4,957,176363980,-; ? is_current_pgrp_orphaned+0x90/0x90
4,958,176363983,-; ? __kthread_parkme+0x86/0x150
4,959,176363987,-; ? process_one_work+0x13e0/0x13e0
4,960,176363990,-; make_task_dead+0xab/0xc0
4,961,176363993,-; rewind_stack_and_make_dead+0x17/0x17
4,962,176363996,-;RIP: 0000:0x0
4,963,176364000,-;Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
4,964,176364002,-;RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
4,965,176364005,-;RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
4,966,176364007,-;RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
4,967,176364009,-;RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
4,968,176364011,-;R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
4,969,176364013,-;R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
4,970,176364015,-; </TASK>
4,971,176364017,-;---[ end trace 0000000000000000 ]---