On 4/26/21 2:40 AM, Bruno Goncalves wrote: > We hit kernel panic with the recent commit (ffa77af5), like: > > [ 5.093548] usb 2-2: Product: AVO USB2 RIP > [ 5.101546] ata3.00: configured for UDMA/100 > [ 5.104910] usb 2-2: Manufacturer: Avocent > [ 5.104912] usb 2-2: SerialNumber: 10343009E7D > [ 5.106686] device-mapper: uevent: version 1.0.3 > [ 5.106719] BUG: kernel NULL pointer dereference, address: 0000000000000378 > [ 5.106721] #PF: supervisor read access in kernel mode > [ 5.106722] #PF: error_code(0x0000) - not-present page > [ 5.106724] PGD 0 P4D 0 > [ 5.106726] Oops: 0000 [#1] SMP PTI > [ 5.106728] CPU: 2 PID: 7 Comm: kworker/u65:0 Tainted: G I 5.12.0-rc8 #1 > [ 5.106731] Hardware name: Hewlett-Packard HP Z600 Workstation/0B54h, BIOS 786G4 v03.19 03/11/2011 > [ 5.106732] Workqueue: events_unbound async_run_entry_fn > [ 5.106738] RIP: 0010:bio_add_hw_page+0x4f/0x180 > [ 5.106741] Code: 09 44 39 c8 0f 87 f3 00 00 00 0f b7 46 70 49 89 fc 49 89 d6 45 89 c5 66 85 c0 75 60 66 39 43 72 0f 86 d7 00 00 00 48 8b 53 08 <48> 8b 92 78 03 00 00 48 8b 52 50 8b 92 10 04 00 00 29 ea 39 53 28 > [ 5.106743] RSP: 0000:ffffa1c64005fc38 EFLAGS: 00010202 > [ 5.106745] RAX: 0000000000000000 RBX: ffff956641caad80 RCX: 0000000000000024 > [ 5.106747] RDX: 0000000000000000 RSI: ffff956641caad80 RDI: ffff95667679afa0 > [ 5.106748] RBP: 0000000000000024 R08: 0000000000000200 R09: 0000000000000400 > [ 5.106749] R10: 0000000000000002 R11: ffff956641ca9e8f R12: ffff95667679afa0 > [ 5.106750] R13: 0000000000000200 R14: ffffc299c00a9b40 R15: 0000000000000024 > [ 5.106752] FS: 0000000000000000(0000) GS:ffff9566fc080000(0000) knlGS:0000000000000000 > [ 5.106754] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 5.106755] CR2: 0000000000000378 CR3: 000000002a610001 CR4: 00000000000206e0 > [ 5.106757] Call Trace: > [ 5.106760] bio_add_pc_page+0x20/0x30 > [ 5.106762] blk_rq_map_kern+0x139/0x3f0 > [ 5.106765] __scsi_execute+0x204/0x250 > [ 5.106770] scsi_probe_and_add_lun+0x188/0xda0 > [ 5.106774] ? __pm_runtime_resume+0x58/0x80 > [ 5.106778] __scsi_add_device+0xdb/0xf0 > [ 5.106781] ata_scsi_scan_host+0x97/0x1d0 > [ 5.106784] async_run_entry_fn+0x39/0x160 > [ 5.106786] process_one_work+0x1ec/0x380 > [ 5.106789] worker_thread+0x53/0x3e0 > [ 5.106791] ? process_one_work+0x380/0x380 > [ 5.106793] kthread+0x11b/0x140 > [ 5.106796] ? __kthread_bind_mask+0x60/0x60 > [ 5.106798] ret_from_fork+0x22/0x30 > [ 5.106804] Modules linked in: > [ 5.106805] CR2: 0000000000000378 > [ 5.106807] ---[ end trace 9b02598b51db6513 ]--- > [ 5.106808] RIP: 0010:bio_add_hw_page+0x4f/0x180 > [ 5.106811] Code: 09 44 39 c8 0f 87 f3 00 00 00 0f b7 46 70 49 89 fc 49 89 d6 45 89 c5 66 85 c0 75 60 66 39 43 72 0f 86 d7 00 00 00 48 8b 53 08 <48> 8b 92 78 03 00 00 48 8b 52 50 8b 92 10 04 00 00 29 ea 39 53 28 > [ 5.106813] RSP: 0000:ffffa1c64005fc38 EFLAGS: 00010202 > [ 5.106814] RAX: 0000000000000000 RBX: ffff956641caad80 RCX: 0000000000000024 > [ 5.106816] RDX: 0000000000000000 RSI: ffff956641caad80 RDI: ffff95667679afa0 > [ 5.106817] RBP: 0000000000000024 R08: 0000000000000200 R09: 0000000000000400 > [ 5.106818] R10: 0000000000000002 R11: ffff956641ca9e8f R12: ffff95667679afa0 > [ 5.106819] R13: 0000000000000200 R14: ffffc299c00a9b40 R15: 0000000000000024 > [ 5.106820] FS: 0000000000000000(0000) GS:ffff9566fc080000(0000) knlGS:0000000000000000 > [ 5.106822] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 5.106823] CR2: 0000000000000378 CR3: 000000002a610001 CR4: 00000000000206e0 > [ 5.410328] device-mapper: ioctl: 4.44.0-ioctl (2021-02-01) initialised: dm-devel@xxxxxxxxxx <mailto:dm-devel@xxxxxxxxxx> > > > We can't say for sure what commit introduced the problem, but with commit "e62a826b" we didn't see this issue. It was: commit 15050b63567cb841e2b4137b957df52991f3b8ec Author: Changheun Lee <nanich.lee@xxxxxxxxxxx> Date: Wed Apr 21 18:47:45 2021 +0900 bio: limit bio max size and it has been dropped. -- Jens Axboe
