On Fri, 15 Nov 2024, Song Liu wrote: > + dm folks > > It appears the crash happens in dm.c:clone_endio. Commit > aaa53168cbcc486ca1927faac00bd99e81d4ff04 made some > changes to clone_endio, but I haven't looked into it. > > Thanks, > Song Hi That commit just adds a test for tio->ti being NULL, so I doubt that it caused this error. Mikulas > On Fri, Nov 15, 2024 at 4:12 AM Genes Lists <lists@xxxxxxxxxxxx> wrote: > > > > md-raid crashed with kernel NULL pointer deref on stable 6.11.8. > > > > Happened with raid6 while rsync was writing (data was pulled over > > network). > > > > This rsync happens twice every day without a problem. This was the > > second run after booting 6.11.8, so will see if/when it happens again - > > and if frequent enough to make a bisect possible. > > > > Nonetheless, reporting now in case it's helpful. > > > > Full dmesg attached but the interesting part is: > > > > [33827.216164] BUG: kernel NULL pointer dereference, address: > > 0000000000000050 > > [33827.216183] #PF: supervisor read access in kernel mode > > [33827.216193] #PF: error_code(0x0000) - not-present page > > [33827.216203] PGD 0 P4D 0 > > [33827.216211] Oops: Oops: 0000 [#1] PREEMPT SMP PTI > > [33827.216221] CPU: 4 UID: 0 PID: 793 Comm: md127_raid6 Not tainted > > 6.11.8-stable-1 #21 1400000003000000474e5500ae13c727d476f9ab > > [33827.216240] Hardware name: To Be Filled By O.E.M. To Be Filled By > > O.E.M./Z370 Extreme4, BIOS P4.20 10/31/2019 > > [33827.216254] RIP: 0010:clone_endio+0x43/0x1f0 [dm_mod] > > [33827.216279] Code: 4c 8b 77 e8 65 48 8b 1c 25 28 00 00 00 48 89 5c 24 > > 08 48 89 fb 88 44 24 07 4d 85 f6 0f 84 11 01 00 00 49 8b 56 08 4c 8b 6b > > e0 <48> 8b 6a 50 4d 8b 65 38 3c 05 0f 84 0b 01 00 00 66 90 48 85 ed 74 > > [33827.216304] RSP: 0018:ffffb9610101bb40 EFLAGS: 00010282 > > [33827.216315] RAX: 0000000000000000 RBX: ffff9b15b8c5c598 RCX: > > 000000000015000c > > [33827.216326] RDX: 0000000000000000 RSI: ffffec17e1944200 RDI: > > ffff9b15b8c5c598 > > [33827.216338] RBP: 0000000000000000 R08: ffff9b1825108c00 R09: > > 000000000015000c > > [33827.216349] R10: 000000000015000c R11: 00000000ffffffff R12: > > ffff9b10da026000 > > [33827.216360] R13: ffff9b15b8c5c520 R14: ffff9b10ca024440 R15: > > ffff9b1474cb33c0 > > [33827.216372] FS: 0000000000000000(0000) GS:ffff9b185ee00000(0000) > > knlGS:0000000000000000 > > [33827.216385] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [33827.216394] CR2: 0000000000000050 CR3: 00000001f4e22005 CR4: > > 00000000003706f0 > > [33827.216406] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > 0000000000000000 > > [33827.216417] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: > > 0000000000000400 > > [33827.216429] Call Trace: > > [33827.216435] <TASK> > > [33827.216442] ? __die_body.cold+0x19/0x27 > > [33827.216453] ? page_fault_oops+0x15a/0x2d0 > > [33827.216465] ? exc_page_fault+0x7e/0x180 > > [33827.216475] ? asm_exc_page_fault+0x26/0x30 > > [33827.216486] ? clone_endio+0x43/0x1f0 [dm_mod > > 1400000003000000474e5500e90ca42f094c5280] > > [33827.216510] clone_endio+0x120/0x1f0 [dm_mod > > 1400000003000000474e5500e90ca42f094c5280] > > [33827.216533] md_end_clone_io+0x42/0xa0 [md_mod > > 1400000003000000474e55004ac7ec7b1ac1c22c] > > [33827.216559] handle_stripe_clean_event+0x1e6/0x430 [raid456 > > 1400000003000000474e550080acde909728c7a9] > > [33827.216583] handle_stripe+0x9a3/0x1c00 [raid456 > > 1400000003000000474e550080acde909728c7a9] > > [33827.216606] handle_active_stripes.isra.0+0x381/0x5b0 [raid456 > > 1400000003000000474e550080acde909728c7a9] > > [33827.216625] ? psi_task_switch+0xb7/0x200 > > [33827.216637] raid5d+0x450/0x670 [raid456 > > 1400000003000000474e550080acde909728c7a9] > > [33827.216655] ? lock_timer_base+0x76/0xa0 > > [33827.216666] md_thread+0xa2/0x190 [md_mod > > 1400000003000000474e55004ac7ec7b1ac1c22c] > > [33827.216689] ? __pfx_autoremove_wake_function+0x10/0x10 > > [33827.216701] ? __pfx_md_thread+0x10/0x10 [md_mod > > 1400000003000000474e55004ac7ec7b1ac1c22c] > > [33827.216723] kthread+0xcf/0x100 > > [33827.216731] ? __pfx_kthread+0x10/0x10 > > [33827.216740] ret_from_fork+0x31/0x50 > > [33827.216749] ? __pfx_kthread+0x10/0x10 > > [33827.216757] ret_from_fork_asm+0x1a/0x30 > > [33827.216769] </TASK> > > > > -- > > Gene > > >
