I ran xfstests against vanilla v6.7 to establish a baseline and hit this. Maybe it was in xfs/359 or maybe xfs/359 was the last test to successfully complete. XFS (vdc): EXPERIMENTAL online scrub feature in use. Use at your own risk! [U] ++ Detect fuzzed field ill-health report [U] ++ Try to repair filesystem (online) XFS (vdc): Corruption not fixed during online repair. Unmount and run xfs_repair. XFS (vdc): Corruption not fixed during online repair. Unmount and run xfs_repair. [U] ++ Make sure error is gone (online) XFS (vdc): Unmounting Filesystem 743f3785-a53c-472d-aa4c-9f3d419b08b7 XFS (vdc): Uncorrected metadata errors detected; please run xfs_repair. [U] + Make sure error is gone (offline) [U] + Mount filesystem to make changes XFS (vdc): Mounting V5 Filesystem 743f3785-a53c-472d-aa4c-9f3d419b08b7 XFS (vdc): Ending clean mount [U] ++ Try to write filesystem again XFS: Assertion failed: 0, file: fs/xfs/libxfs/xfs_btree.c, line: 1756 ------------[ cut here ]------------ kernel BUG at fs/xfs/xfs_message.c:102! invalid opcode: 0000 [#1] SMP CPU: 0 PID: 1158473 Comm: kworker/u32:2 Not tainted 6.7.0-ktest #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: writeback wb_workfn (flush-254:32) RIP: 0010:assfail+0x39/0x40 Code: c9 48 c7 c2 f8 f9 b9 81 48 89 e5 48 89 f1 48 89 fe 48 c7 c7 d2 9e b3 81 e8 a4 fd ff ff 80 3d ed d2 b7 00 00 75 04 0f 0b 5d c3 <0f> 0b 90 0f 1f 40 00 66 0f 1f 00 0f 1f 44 00 00 55 48 63 f6 49 89 RSP: 0018:ffff88812d5d3430 EFLAGS: 00010202 RAX: 00000000ffffffea RBX: ffff888109abb290 RCX: 000000007fffffff RDX: 0000000000000021 RSI: 0000000000000000 RDI: ffffffff81b39ed2 RBP: ffff88812d5d3430 R08: 0000000000000000 R09: 000000000000000a R10: 000000000000000a R11: 0fffffffffffffff R12: 0000000000000002 R13: 0000000000000000 R14: ffff88812d5d34bc R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888179600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffa788c27d0 CR3: 0000000001e2a000 CR4: 0000000000750eb0 PKRU: 55555554 Call Trace: <TASK> ? show_regs+0x65/0x70 ? die+0x3b/0x90 ? do_trap+0xc4/0xe0 ? do_error_trap+0x6c/0x90 ? assfail+0x39/0x40 ? exc_invalid_op+0x56/0x70 ? assfail+0x39/0x40 ? asm_exc_invalid_op+0x1f/0x30 ? assfail+0x39/0x40 xfs_btree_decrement+0x2e3/0x350 xfs_alloc_walk_iter+0xb5/0xe0 xfs_alloc_ag_vextent_locality+0x165/0x3c0 xfs_alloc_ag_vextent_near+0x2b8/0x530 xfs_alloc_vextent_iterate_ags.constprop.0+0xcd/0x210 xfs_alloc_vextent_start_ag+0xd3/0x190 xfs_bmap_btalloc+0x375/0x5b0 xfs_bmapi_allocate+0xd4/0x440 xfs_bmapi_convert_delalloc+0x32e/0x530 xfs_map_blocks+0x21a/0x590 iomap_do_writepage+0x22f/0x7f0 write_cache_pages+0x162/0x3d0 ? iomap_truncate_page+0x50/0x50 iomap_writepages+0x24/0x40 xfs_vm_writepages+0x73/0xa0 do_writepages+0xb1/0x1a0 __writeback_single_inode+0x40/0x2d0 writeback_sb_inodes+0x1a1/0x430 __writeback_inodes_wb+0x54/0xf0 ? queue_io+0xf1/0x100 wb_writeback+0x233/0x280 wb_workfn+0x2a8/0x420 ? __switch_to+0x131/0x460 process_one_work+0x138/0x2c0 worker_thread+0x2ea/0x420 ? flush_work+0x20/0x20 kthread+0xdb/0x100 ? kthread_complete_and_exit+0x30/0x30 ret_from_fork+0x3a/0x60 ? kthread_complete_and_exit+0x30/0x30 ret_from_fork_asm+0x11/0x20 </TASK> Modules linked in: crct10dif_generic crct10dif_common [last unloaded: crc_t10dif] ---[ end trace 0000000000000000 ]--- RIP: 0010:assfail+0x39/0x40 Code: c9 48 c7 c2 f8 f9 b9 81 48 89 e5 48 89 f1 48 89 fe 48 c7 c7 d2 9e b3 81 e8 a4 fd ff ff 80 3d ed d2 b7 00 00 75 04 0f 0b 5d c3 <0f> 0b 90 0f 1f 40 00 66 0f 1f 00 0f 1f 44 00 00 55 48 63 f6 49 89 RSP: 0018:ffff88812d5d3430 EFLAGS: 00010202 RAX: 00000000ffffffea RBX: ffff888109abb290 RCX: 000000007fffffff RDX: 0000000000000021 RSI: 0000000000000000 RDI: ffffffff81b39ed2 RBP: ffff88812d5d3430 R08: 0000000000000000 R09: 000000000000000a R10: 000000000000000a R11: 0fffffffffffffff R12: 0000000000000002 R13: 0000000000000000 R14: ffff88812d5d34bc R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888179600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffa788c27d0 CR3: 0000000001e2a000 CR4: 0000000000750eb0 PKRU: 55555554 Kernel panic - not syncing: Fatal exception Kernel Offset: disabled ---[ end Kernel panic - not syncing: Fatal exception ]---
