Public bug reported: Using latest zfs 0.8.3-1ubuntu12.4 on latest Ubuntu 20.04.1, I observe a rare zfs panics that seem to be workload-specific which render a server mostly unresponsive besides ssh still working. Attempting to reboot the server in this state makes the shutdown hang forever.
You may want to consider backporting the fix released in zfs 0.8.4 into 20.04: https://github.com/openzfs/zfs/pull/10148 Log sample of panic: ``` Nov 17 16:06:15 hostname kernel: [3385134.716024] PANIC: zfs: accessing past end of object c1c/2db52f (size=17408 access=7492+16428) Nov 17 16:06:15 hostname kernel: [3385134.716072] Showing stack for process 3166846 Nov 17 16:06:15 hostname kernel: [3385134.716074] CPU: 25 PID: 3166846 Comm: node Tainted: P O 5.4.0-48-generic #52-Ubuntu Nov 17 16:06:15 hostname kernel: [3385134.716075] Hardware name: <hardware> Nov 17 16:06:15 hostname kernel: [3385134.716076] Call Trace: Nov 17 16:06:15 hostname kernel: [3385134.716085] dump_stack+0x6d/0x9a Nov 17 16:06:15 hostname kernel: [3385134.716097] spl_dumpstack+0x29/0x2b [spl] Nov 17 16:06:15 hostname kernel: [3385134.716102] vcmn_err.cold+0x60/0x99 [spl] Nov 17 16:06:15 hostname kernel: [3385134.716106] ? _cond_resched+0x19/0x30 Nov 17 16:06:15 hostname kernel: [3385134.716108] ? __kmalloc_node+0x20e/0x330 Nov 17 16:06:15 hostname kernel: [3385134.716113] ? spl_kmem_alloc_impl+0xa8/0x100 [spl] Nov 17 16:06:15 hostname kernel: [3385134.716190] ? __list_add+0x17/0x40 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716235] zfs_panic_recover+0x6f/0x90 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716272] ? dsl_dir_tempreserve_impl.isra.0.constprop.0+0xed/0x330 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716305] dmu_buf_hold_array_by_dnode+0x3a0/0x490 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716338] dmu_write_uio_dnode+0x4c/0x140 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716370] dmu_write_uio_dbuf+0x4f/0x70 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716416] zfs_write+0xa1f/0xd40 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716419] ? d_absolute_path+0x74/0xb0 Nov 17 16:06:15 hostname kernel: [3385134.716421] ? __switch_to_asm+0x34/0x70 Nov 17 16:06:15 hostname kernel: [3385134.716423] ? __switch_to_asm+0x40/0x70 Nov 17 16:06:15 hostname kernel: [3385134.716424] ? __switch_to_asm+0x40/0x70 Nov 17 16:06:15 hostname kernel: [3385134.716425] ? __switch_to_asm+0x34/0x70 Nov 17 16:06:15 hostname kernel: [3385134.716427] ? __switch_to_asm+0x34/0x70 Nov 17 16:06:15 hostname kernel: [3385134.716474] zpl_write_common_iovec+0xad/0x120 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716567] zpl_iter_write+0x56/0x90 [zfs] Nov 17 16:06:15 hostname kernel: [3385134.716570] do_iter_write+0x84/0x1a0 Nov 17 16:06:15 hostname kernel: [3385134.716574] ? futex_wake+0x8b/0x180 Nov 17 16:06:15 hostname kernel: [3385134.716577] do_writev+0x71/0x120 Nov 17 16:06:15 hostname kernel: [3385134.716581] do_syscall_64+0x57/0x190 Nov 17 16:06:15 hostname kernel: [3385134.716584] RIP: 0033:0x7fa366eee0cd Nov 17 16:06:15 hostname kernel: [3385134.716587] RSP: 002b:00007fa35e7fbde0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 Nov 17 16:06:15 hostname kernel: [3385134.716590] RDX: 000000000000000c RSI: 000000000651c7b0 RDI: 000000000000001d ``` ** Affects: zfs-linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1904589 Title: zfs PANIC: accessing past end of object in 0.8.3-1ubuntu12.4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1904589/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
