Example backtraces: Mar 4 05:41:40 host kernel: [291932.968664] INFO: task tar:44877 blocked for more than 120 seconds. Mar 4 05:41:40 host kernel: [291932.968826] Tainted: P OE 5.4.0-100-generic #113~18.04.1-Ubuntu Mar 4 05:41:40 host kernel: [291932.969019] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Mar 4 05:41:40 host kernel: [291932.969222] tar D 0 44877 44865 0x00004000 Mar 4 05:41:40 host kernel: [291932.969226] Call Trace: Mar 4 05:41:40 host kernel: [291932.969239] __schedule+0x292/0x720 Mar 4 05:41:40 host kernel: [291932.969315] ? xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.969321] schedule+0x33/0xa0 Mar 4 05:41:40 host kernel: [291932.969325] schedule_timeout+0x1d3/0x320 Mar 4 05:41:40 host kernel: [291932.969381] ? xfs_btree_update+0x7f/0xe0 [xfs] Mar 4 05:41:40 host kernel: [291932.969444] ? xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.969448] __down+0x91/0xe0 Mar 4 05:41:40 host kernel: [291932.969454] ? page_counter_try_charge+0x10/0xd0 Mar 4 05:41:40 host kernel: [291932.969460] down+0x41/0x50 Mar 4 05:41:40 host kernel: [291932.969463] ? down+0x41/0x50 Mar 4 05:41:40 host kernel: [291932.969521] xfs_buf_lock+0x3c/0xf0 [xfs] Mar 4 05:41:40 host kernel: [291932.969575] xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.969629] xfs_buf_get_map+0x43/0x2b0 [xfs] Mar 4 05:41:40 host kernel: [291932.969684] xfs_buf_read_map+0x2c/0x1c0 [xfs] Mar 4 05:41:40 host kernel: [291932.969757] xfs_trans_read_buf_map+0xd5/0x360 [xfs] Mar 4 05:41:40 host kernel: [291932.969805] xfs_read_agf+0x92/0x120 [xfs] Mar 4 05:41:40 host kernel: [291932.969851] xfs_alloc_read_agf+0x47/0x1c0 [xfs] Mar 4 05:41:40 host kernel: [291932.969896] xfs_alloc_fix_freelist+0x2d2/0x500 [xfs] Mar 4 05:41:40 host kernel: [291932.969899] ? down+0x2e/0x50 Mar 4 05:41:40 host kernel: [291932.969955] ? xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.969960] ? radix_tree_lookup+0xd/0x10 Mar 4 05:41:40 host kernel: [291932.970016] ? xfs_perag_get+0x2c/0xc0 [xfs] Mar 4 05:41:40 host kernel: [291932.970061] xfs_alloc_vextent+0x334/0x590 [xfs] Mar 4 05:41:40 host kernel: [291932.970115] xfs_ialloc_ag_alloc+0x17e/0x710 [xfs] Mar 4 05:41:40 host kernel: [291932.970183] ? xfs_trans_read_buf_map+0x183/0x360 [xfs] Mar 4 05:41:40 host kernel: [291932.970238] xfs_dialloc+0x139/0x280 [xfs] Mar 4 05:41:40 host kernel: [291932.970302] xfs_ialloc+0x7c/0x520 [xfs] Mar 4 05:41:40 host kernel: [291932.970364] xfs_dir_ialloc+0x62/0x1e0 [xfs] Mar 4 05:41:40 host kernel: [291932.970422] xfs_create+0x3d9/0x570 [xfs] Mar 4 05:41:40 host kernel: [291932.970479] xfs_generic_create+0x20e/0x2f0 [xfs] Mar 4 05:41:40 host kernel: [291932.970534] xfs_vn_mknod+0x14/0x20 [xfs] Mar 4 05:41:40 host kernel: [291932.970588] xfs_vn_create+0x13/0x20 [xfs] Mar 4 05:41:40 host kernel: [291932.970593] path_openat+0x12cb/0x16a0 Mar 4 05:41:40 host kernel: [291932.970659] ? xfs_trans_get_bud+0x4/0x70 [xfs] Mar 4 05:41:40 host kernel: [291932.970717] ? xfs_perag_get+0x2c/0xc0 [xfs] Mar 4 05:41:40 host kernel: [291932.970721] do_filp_open+0x9b/0x110 Mar 4 05:41:40 host kernel: [291932.970728] ? list_lru_add+0x6c/0x1b0 Mar 4 05:41:40 host kernel: [291932.970731] ? __check_object_size+0xdb/0x1b0 Mar 4 05:41:40 host kernel: [291932.970736] ? __alloc_fd+0x46/0x170 Mar 4 05:41:40 host kernel: [291932.970741] do_sys_open+0x1ba/0x2e0 Mar 4 05:41:40 host kernel: [291932.970744] ? do_sys_open+0x1ba/0x2e0 Mar 4 05:41:40 host kernel: [291932.970747] ? _cond_resched+0x19/0x40 Mar 4 05:41:40 host kernel: [291932.970751] ? task_work_run+0x46/0xc0 Mar 4 05:41:40 host kernel: [291932.970755] __x64_sys_openat+0x20/0x30 Mar 4 05:41:40 host kernel: [291932.970760] do_syscall_64+0x57/0x190 Mar 4 05:41:40 host kernel: [291932.970765] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Mar 4 05:41:40 host kernel: [291932.970768] RIP: 0033:0x7f5e77b6ff83 Mar 4 05:41:40 host kernel: [291932.970775] Code: Bad RIP value. Mar 4 05:41:40 host kernel: [291932.970777] RSP: 002b:00007ffda22272e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 Mar 4 05:41:40 host kernel: [291932.970781] RAX: ffffffffffffffda RBX: 00000000000809c1 RCX: 00007f5e77b6ff83 Mar 4 05:41:40 host kernel: [291932.970782] RDX: 00000000000809c1 RSI: 00005595a1b27d10 RDI: 0000000000000003 Mar 4 05:41:40 host kernel: [291932.970784] RBP: 00000000000001a4 R08: 0000000000000020 R09: 00000000ffffffd0 Mar 4 05:41:40 host kernel: [291932.970786] R10: 00000000000001a4 R11: 0000000000000246 R12: 0000000000000000 Mar 4 05:41:40 host kernel: [291932.970787] R13: 00005595a1b27d10 R14: 00005595a091f6f0 R15: 00007ffda2227377 Mar 4 05:41:40 host kernel: [291932.970796] INFO: task perl:50597 blocked for more than 120 seconds. Mar 4 05:41:40 host kernel: [291932.970952] Tainted: P OE 5.4.0-100-generic #113~18.04.1-Ubuntu Mar 4 05:41:40 host kernel: [291932.971147] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Mar 4 05:41:40 host kernel: [291932.971354] perl D 0 50597 22548 0x00004000 Mar 4 05:41:40 host kernel: [291932.971357] Call Trace: Mar 4 05:41:40 host kernel: [291932.971362] __schedule+0x292/0x720 Mar 4 05:41:40 host kernel: [291932.971422] ? xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.971425] schedule+0x33/0xa0 Mar 4 05:41:40 host kernel: [291932.971428] schedule_timeout+0x1d3/0x320 Mar 4 05:41:40 host kernel: [291932.971484] ? xfs_buf_trylock+0x1f/0xd0 [xfs] Mar 4 05:41:40 host kernel: [291932.971538] ? xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.971542] __down+0x91/0xe0 Mar 4 05:41:40 host kernel: [291932.971546] down+0x41/0x50 Mar 4 05:41:40 host kernel: [291932.971549] ? down+0x41/0x50 Mar 4 05:41:40 host kernel: [291932.971601] xfs_buf_lock+0x3c/0xf0 [xfs] Mar 4 05:41:40 host kernel: [291932.971652] xfs_buf_find.isra.34+0x205/0x640 [xfs] Mar 4 05:41:40 host kernel: [291932.971705] xfs_buf_get_map+0x43/0x2b0 [xfs] Mar 4 05:41:40 host kernel: [291932.971757] xfs_buf_read_map+0x2c/0x1c0 [xfs] Mar 4 05:41:40 host kernel: [291932.971760] ? _cond_resched+0x19/0x40 Mar 4 05:41:40 host kernel: [291932.971828] xfs_trans_read_buf_map+0xd5/0x360 [xfs] Mar 4 05:41:40 host kernel: [291932.971883] xfs_read_agi+0x93/0x130 [xfs] Mar 4 05:41:40 host kernel: [291932.971945] xfs_iunlink_remove+0x66/0x260 [xfs] Mar 4 05:41:40 host kernel: [291932.972011] ? xfs_trans_reserve+0x14f/0x1d0 [xfs] Mar 4 05:41:40 host kernel: [291932.972072] xfs_ifree+0x42/0x160 [xfs] Mar 4 05:41:40 host kernel: [291932.972130] xfs_inactive_ifree+0xab/0x1c0 [xfs] Mar 4 05:41:40 host kernel: [291932.972185] xfs_inactive+0xa8/0x140 [xfs] Mar 4 05:41:40 host kernel: [291932.972247] xfs_fs_destroy_inode+0xaf/0x1e0 [xfs] Mar 4 05:41:40 host kernel: [291932.972251] destroy_inode+0x41/0x80 Mar 4 05:41:40 host kernel: [291932.972255] evict+0x139/0x1a0 Mar 4 05:41:40 host kernel: [291932.972258] iput+0x143/0x210 Mar 4 05:41:40 host kernel: [291932.972262] do_unlinkat+0x19c/0x320 Mar 4 05:41:40 host kernel: [291932.972266] __x64_sys_unlink+0x23/0x30 Mar 4 05:41:40 host kernel: [291932.972270] do_syscall_64+0x57/0x190 Mar 4 05:41:40 host kernel: [291932.972275] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Mar 4 05:41:40 host kernel: [291932.972277] RIP: 0033:0x7f6d3a775e17 Mar 4 05:41:40 host kernel: [291932.972281] Code: Bad RIP value. Mar 4 05:41:40 host kernel: [291932.972283] RSP: 002b:00007ffe5a2888c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 Mar 4 05:41:40 host kernel: [291932.972286] RAX: ffffffffffffffda RBX: 000055dc7dbde260 RCX: 00007f6d3a775e17 Mar 4 05:41:40 host kernel: [291932.972287] RDX: 00007ffe5a288900 RSI: 00007ffe5a288900 RDI: 000055dc7e43d640 Mar 4 05:41:40 host kernel: [291932.972289] RBP: 000055dc7e784ed8 R08: 0000000000000000 R09: 0000000000000006 Mar 4 05:41:40 host kernel: [291932.972291] R10: 000055dc7e623ff8 R11: 0000000000000206 R12: 0000000000000001 Mar 4 05:41:40 host kernel: [291932.972292] R13: 000055dc7e784ed8 R14: 00007ffe5a2888f8 R15: 000055dc7e43d640
** Description changed: SRU Justification: [Impact] * The xfs filesystem suffers from a deadlock issue in kernels < 5.5. This hangs IO to/from the affected filesystem. [Fix] * 93597ae8dac0149b5c00b787cba6bf7ba213e666 93597ae8dac0 "xfs: Fix deadlock between AGI and AGF when target_ip exists in xfs_rename()" + + * This is from the upstream 5.5 kernel. [Test Plan] * Set up an Ubuntu Bionic/Focal installation using kernel 5.4. * Create and mount an XFS filesystem on a block device. * Exercise the filesystem to verify that IO does not hang. [Where problems could occur] * This patch could cause locking issues on XFS filesystems, requiring a system restart to correct. [Other Info] * Bug is difficult to reproduce, a test kernel on affected systems with the above patch prevented the issue. + + * Backports to earlier (4.15 and earlier) kernels have been omitted as + the upstream patch does not apply cleanly and the issue has not been + reproduced on them. ** Description changed: SRU Justification: [Impact] * The xfs filesystem suffers from a deadlock issue in kernels < 5.5. - This hangs IO to/from the affected filesystem. + This hangs IO to/from the affected filesystem. Sample backtraces added + as a comment. [Fix] * 93597ae8dac0149b5c00b787cba6bf7ba213e666 93597ae8dac0 "xfs: Fix deadlock between AGI and AGF when target_ip exists in xfs_rename()" * This is from the upstream 5.5 kernel. [Test Plan] * Set up an Ubuntu Bionic/Focal installation using kernel 5.4. * Create and mount an XFS filesystem on a block device. * Exercise the filesystem to verify that IO does not hang. [Where problems could occur] * This patch could cause locking issues on XFS filesystems, requiring a system restart to correct. [Other Info] * Bug is difficult to reproduce, a test kernel on affected systems with the above patch prevented the issue. * Backports to earlier (4.15 and earlier) kernels have been omitted as the upstream patch does not apply cleanly and the issue has not been reproduced on them. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1966803 Title: xfs: Fix deadlock between AGI and AGF when target_ip exists in xfs_rename() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1966803/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
