We got the following backtrace in our CI system, while executing a non-FS-intensive test. This means it is gonna be a little hard to reproduce the issue, but I wanted to share it with you anyway as this might already have all the information you need. [ 43.666366] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1342 [ 43.666550] in_atomic(): 0, irqs_disabled(): 1, pid: 233, name: systemd-journal [ 43.666576] 4 locks held by systemd-journal/233: [ 43.666578] #0: 00000000f4e8f811 (&mm->mmap_sem){++++}, at: __do_page_fault+0x116/0x590 [ 43.666593] #1: 000000008a5afe3b (sb_pagefaults){.+.+}, at: ext4_page_mkwrite+0x56/0x4f0 [ 43.666607] #2: 0000000037ac1e86 (&ei->i_mmap_sem){++++}, at: ext4_page_mkwrite+0x6a/0x4f0 [ 43.666618] #3: 00000000f4e8f811 (&mm->mmap_sem){++++}, at: __do_page_fault+0x116/0x590 [ 43.666629] irq event stamp: 956418 [ 43.666634] hardirqs last enabled at (956417): [<ffffffff811174b4>] current_kernel_time64+0x94/0xb0 [ 43.666638] hardirqs last disabled at (956418): [<ffffffff811f6709>] __slab_alloc.isra.27.constprop.33+0x19/0x70 [ 43.666643] softirqs last enabled at (944462): [<ffffffff818ae1ea>] unix_sock_destructor+0x4a/0xb0 [ 43.666646] softirqs last disabled at (944460): [<ffffffff818ae1ea>] unix_sock_destructor+0x4a/0xb0 [ 43.666650] CPU: 0 PID: 233 Comm: systemd-journal Tainted: G U 4.17.0-rc7-CI-CI_DRM_4286+ #1 [ 43.666652] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016 [ 43.666654] Call Trace: [ 43.666660] dump_stack+0x67/0x9b [ 43.666665] ___might_sleep+0x167/0x250 [ 43.666670] __do_page_fault+0x133/0x590 [ 43.666679] page_fault+0x1e/0x30 [ 43.666682] RIP: 0010:deactivate_slab.isra.26+0x1bb/0x8d0 [ 43.666684] RSP: 0000:ffffc900003c7980 EFLAGS: 00010086 [ 43.666688] RAX: 0000000080000000 RBX: 00000000001653f1 RCX: 0000000000000001 [ 43.666690] RDX: 0000000080000001 RSI: 0000000000000070 RDI: 00000000ffffffff [ 43.666692] RBP: ffffc900003c7a80 R08: ffff88041fa26c00 R09: ffff880400123ae0 [ 43.666695] R10: ffffc900003c7aa0 R11: 0000000000000000 R12: ffffea0010004800 [ 43.666697] R13: ffff880400122268 R14: ffff88040e179a40 R15: 0000000180250017 [ 43.666709] ? __kernel_text_address+0x9/0x30 [ 43.666714] ? __save_stack_trace+0x8d/0xf0 [ 43.666723] ? alloc_buffer_head+0x18/0x80 [ 43.666729] ? set_track+0x90/0x140 [ 43.666732] ? init_object+0x66/0x80 [ 43.666737] ? ___slab_alloc.constprop.34+0x232/0x3e0 [ 43.666740] ___slab_alloc.constprop.34+0x232/0x3e0 [ 43.666743] ? alloc_buffer_head+0x18/0x80 [ 43.666747] ? __lock_acquire+0x3c8/0x1b50 [ 43.666755] ? __lock_acquire+0x3c8/0x1b50 [ 43.666760] ? alloc_buffer_head+0x18/0x80 [ 43.666764] ? __slab_alloc.isra.27.constprop.33+0x3d/0x70 [ 43.666767] __slab_alloc.isra.27.constprop.33+0x3d/0x70 [ 43.666771] ? alloc_buffer_head+0x18/0x80 [ 43.666774] kmem_cache_alloc+0x234/0x2c0 [ 43.666779] alloc_buffer_head+0x18/0x80 [ 43.666782] alloc_page_buffers+0x84/0xd0 [ 43.666788] create_empty_buffers+0x14/0x100 [ 43.666792] create_page_buffers+0x47/0x50 [ 43.666795] __block_write_begin_int+0x89/0x590 [ 43.666800] ? ext4_inode_attach_jinode.part.18+0xa0/0xa0 [ 43.666807] ? ext4_inode_attach_jinode.part.18+0xa0/0xa0 [ 43.666811] block_page_mkwrite+0xab/0xf0 [ 43.666817] ext4_page_mkwrite+0x3d4/0x4f0 [ 43.666825] do_page_mkwrite+0x2c/0xa0 [ 43.666829] do_wp_page+0x1fc/0x4c0 [ 43.666835] __handle_mm_fault+0x7d6/0xe30 [ 43.666847] handle_mm_fault+0x196/0x3a0 [ 43.666852] __do_page_fault+0x295/0x590 [ 43.666858] ? page_fault+0x8/0x30 [ 43.666862] page_fault+0x1e/0x30 [ 43.666865] RIP: 0033:0x7fc2bf099b00 [ 43.666867] RSP: 002b:00007ffee8318390 EFLAGS: 00010246 [ 43.666871] RAX: 00007fc2b63b9518 RBX: 000055ce8ec61e80 RCX: 00007fc2bf163694 [ 43.666873] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffee8318338 [ 43.666875] RBP: 0000000000000024 R08: 00000000002da7c0 R09: 0000000001c66518 [ 43.666877] R10: 0000000000000000 R11: 0000000000000000 R12: 000055ce8ec51230 [ 43.666879] R13: 00007ffee83183c8 R14: 0000000004012be0 R15: 00007ffee8318538 [ 43.666892] BUG: unable to handle kernel paging request at 0000000000165461 [ 43.666908] Oops: 0000 [#1] PREEMPT SMP PTI Kernel logs (boot): https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4286/shard-hsw1/boot18.log Kernel logs (when running the tests): https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4286/shard-hsw1/dmesg18.log Kernel config: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4286/kernel.config.bz2 Hope this helps!
This issue occurred only once and that too 3 months ago, not seen afterwards.
This bug can be closed as the logs are not found from the above links.