On Fri, 8 Dec 2017 13:08:37 -0700 Jens Axboe <axboe@xxxxxxxxx> wrote: > On 12/08/2017 08:38 AM, Michele Ballabio wrote: > > Hi, > > kernels 4.13.*, 4.14.* 4.15-rc2 crash on occasion, > > especially on x86-32 systems. To trigger the problem, run as root: > > > > while true > > do > > /sbin/udevadm trigger --type=subsystems --action=change > > /sbin/udevadm trigger --type=devices --action=change > > /sbin/udevadm settle --timeout=120 > > done > > > > (Thanks to Patrick Volkerding for the reproducer). > > > > Sometimes the kernel oopses immediately, sometimes a bit later > > (less than five minutes). > > > > The bisection pointed to commit > > caa4b02476e31fc7933d2138062f7f355d3cd8f7 (blk-map: call > > blk_queue_bounce from blk_rq_append_bio). A revert fixes the > > problem (tested on 4.13 and master). > > Thanks for your report - can you try the below patch? Totally > untested... I applied the patch on master (968edbd93c0cbb40ab48aca972392d377713a0c3), I tried two times to boot the system but couldn't get to the shell. I found this in the log: kernel: [ 37.625778] BUG: unable to handle kernel paging request at 00027f30 kernel: [ 37.660642] IP: bio_uncopy_user+0xab/0x120 kernel: [ 37.731620] Oops: 0000 [#1] SMP kernel: [ 37.766587] Modules linked in: kernel: [ 37.800794] CPU: 0 PID: 692 Comm: ata_id Not tainted 4.15.0-rc2-mike-1mike+ #165 kernel: [ 37.836750] Hardware name: System manufacturer System Product Name/PRIME B350-PLUS, BIOS 0902 09/08/2017 kernel: [ 37.873684] EIP: bio_uncopy_user+0xab/0x120 kernel: [ 37.909600] EFLAGS: 00010206 CPU: 0 kernel: [ 37.944533] EAX: ec7ea800 EBX: eb8ef380 ECX: 00027f2c EDX: 802a0013 kernel: [ 37.979895] ESI: 00000004 EDI: 00000000 EBP: e9721d78 ESP: e9721d4c kernel: [ 38.015108] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 kernel: [ 38.050511] CR0: 80050033 CR2: 00027f30 CR3: 2cee0ea0 CR4: 003406f0 kernel: [ 38.085727] Call Trace: kernel: [ 38.119868] ? mempool_free+0x23/0x80 kernel: [ 38.154149] __blk_rq_unmap_user+0x17/0x40 kernel: [ 38.188016] blk_rq_unmap_user+0x27/0x60 kernel: [ 38.221280] sg_io+0x1f4/0x390 kernel: [ 38.253896] ? blkdev_get+0xe6/0x2a0 kernel: [ 38.286291] scsi_cmd_ioctl+0x26a/0x3f0 kernel: [ 38.318792] ? path_openat+0x4e9/0x11e0 kernel: [ 38.350829] scsi_cmd_blk_ioctl+0x30/0x40 kernel: [ 38.382469] sd_ioctl+0x63/0x90 kernel: [ 38.413630] ? scsi_disk_put+0x40/0x40 kernel: [ 38.444589] blkdev_ioctl+0x47a/0x9a0 kernel: [ 38.474897] block_ioctl+0x37/0x40 kernel: [ 38.504137] ? block_ioctl+0x37/0x40 kernel: [ 38.532682] ? blkdev_fallocate+0x220/0x220 kernel: [ 38.560834] do_vfs_ioctl+0x81/0x610 kernel: [ 38.588706] ? putname+0x47/0x60 kernel: [ 38.616480] ? putname+0x47/0x60 kernel: [ 38.643817] ? do_sys_open+0x139/0x230 kernel: [ 38.670493] SyS_ioctl+0x58/0x70 kernel: [ 38.697488] do_int80_syscall_32+0x3e/0xe0 kernel: [ 38.723925] entry_INT80_32+0x31/0x31 kernel: [ 38.750093] EIP: 0xb7dd82c4 kernel: [ 38.775882] EFLAGS: 00000246 CPU: 0 kernel: [ 38.801792] EAX: ffffffda EBX: 00000003 ECX: 00002285 EDX: bfd09900 kernel: [ 38.828336] ESI: bfd0af05 EDI: bfd09940 EBP: bfd09e18 ESP: bfd09868 kernel: [ 38.854585] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b kernel: [ 38.880557] Code: d4 8d 65 f4 5b 5e 5f 5d c3 8d b4 26 00 00 00 00 c7 45 d4 00 00 00 00 eb d6 8d b4 26 00 00 00 00 8b 4d d8 66 83 7b 54 00 8b 73 5c <8b> 41 04 89 45 dc 8b 41 08 89 45 e0 8b 41 0c 89 45 e4 8b 41 10 kernel: [ 38.935585] EIP: bio_uncopy_user+0xab/0x120 SS:ESP: 0068:e9721d4c kernel: [ 38.962830] CR2: 0000000000027f30 kernel: [ 38.989570] ---[ end trace 49c0f0f09584f509 ]--- kernel: [ 43.367782] BUG: unable to handle kernel paging request at 10010021 kernel: [ 43.396195] IP: kmem_cache_alloc+0x8e/0x1d0 kernel: [ 43.450948] Oops: 0000 [#2] SMP kernel: [ 43.478445] Modules linked in: kernel: [ 43.505799] CPU: 6 PID: 573 Comm: fc-cache Tainted: G D 4.15.0-rc2-mike-1mike+ #165 kernel: [ 43.534691] Hardware name: System manufacturer System Product Name/PRIME B350-PLUS, BIOS 0902 09/08/2017 kernel: [ 43.564549] EIP: kmem_cache_alloc+0x8e/0x1d0 kernel: [ 43.594336] EFLAGS: 00010206 CPU: 6 kernel: [ 43.624092] EAX: 00000000 EBX: 10010021 ECX: 0000108a EDX: 00001089 kernel: [ 43.654634] ESI: f77f3ae8 EDI: ecc03980 EBP: ea63fbc0 ESP: ea63fba4 kernel: [ 43.685394] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 kernel: [ 43.716288] CR0: 80050033 CR2: 10010021 CR3: 2bdaee40 CR4: 003406f0 kernel: [ 43.747663] Call Trace: kernel: [ 43.778709] ? mempool_alloc_slab+0x13/0x20 kernel: [ 43.810162] mempool_alloc_slab+0x13/0x20 kernel: [ 43.810165] mempool_alloc+0x3a/0x130 kernel: [ 43.810168] ? cfq_set_request+0x4d/0x4d0 kernel: [ 43.810172] ? native_sched_clock+0x2a/0xd0 kernel: [ 43.810175] bio_alloc_bioset+0x13a/0x220 kernel: [ 43.810177] bio_clone_bioset+0x47/0x370 kernel: [ 43.810180] blk_queue_bounce+0x1cb/0x3a0 kernel: [ 43.810183] blk_queue_bio+0x22/0x3f0 kernel: [ 43.810185] generic_make_request+0xd7/0x2d0 kernel: [ 43.810187] ? mempool_alloc+0x3a/0x130 kernel: [ 43.810189] submit_bio+0x67/0x130 kernel: [ 43.810191] ? bio_alloc_bioset+0x13a/0x220 kernel: [ 43.810194] ext4_mpage_readpages+0x59d/0x8e0 kernel: [ 43.810197] ? __alloc_pages_nodemask+0xd4/0xe80 kernel: [ 43.810202] ext4_readpages+0x31/0x40 kernel: [ 43.810203] ? ext4_readpages+0x31/0x40 kernel: [ 43.810205] ? ext4_invalidatepage+0xb0/0xb0 kernel: [ 43.810208] __do_page_cache_readahead+0x13e/0x1e0 kernel: [ 43.810211] filemap_fault+0x31a/0x550 kernel: [ 43.810214] ? find_get_pages_range_tag+0x270/0x270 kernel: [ 43.810216] ? filemap_map_pages+0x13d/0x2d0 (log ends here, the rest didn't make it to disk).
