Meanwhile I upgraded to kernel 5.0, but the problem remained the same. So I zeroed the log with btrfs rescue zero-log. The command was successful, however the problem still remains more or less the same, which means:
- I still get a kernel oops when mounting. - The stack trace looks a bit different now, e.g. RIP 0010 is not null anymore, and there's another RIP code: 0033. Maybe "set_page_dirty" is interesting, too. But see for yourserlf below. Any ideas? Thorsten Hirsch P.S.: btrfs check --readonly tells me that everything's fine. But it already did so before zeroing the log. [ 12.400224] BTRFS: device label Linux devid 1 transid 30104 /dev/nvme0n1p3 [ 12.400523] BTRFS info (device nvme0n1p3): disk space caching is enabled [ 12.400524] BTRFS info (device nvme0n1p3): has skinny extents [ 12.427049] BTRFS info (device nvme0n1p3): enabling ssd optimizations [ 12.461362] init_special_inode: bogus i_mode (0) for inode nvme0n1p3:882 [ 12.462844] init_special_inode: bogus i_mode (0) for inode nvme0n1p3:802 [ 12.515489] BUG: unable to handle kernel NULL pointer dereference at 0000000000000001 [ 12.515491] #PF error: [normal kernel read fault] [ 12.515492] PGD 0 P4D 0 [ 12.515495] Oops: 0000 [#1] SMP NOPTI [ 12.515497] CPU: 8 PID: 487 Comm: exe Not tainted 5.0.0-7-generic #8-Ubuntu [ 12.515499] Hardware name: Gigabyte Technology Co., Ltd. AB350M-DS3H/AB350M-DS3H-CF, BIOS F24 12/25/2018 [ 12.515504] RIP: 0010:__set_page_dirty_buffers+0x4c/0x100 [ 12.515506] Code: 84 00 00 00 49 89 c5 4c 89 e7 e8 df 71 73 00 48 8b 03 f6 c4 20 74 28 48 8b 03 f6 c4 20 0f 84 ae 00 00 00 48 8b 43 28 48 89 c2 <48> 8b 0a 83 e1 02 75 04 f0 80 0a 02 48 8b 52 08 48 39 d0 75 eb 48 [ 12.515507] RSP: 0018:ffffa9d2c28e7688 EFLAGS: 00010202 [ 12.515509] RAX: 0000000000000001 RBX: ffffe34f45261300 RCX: 0000000000000000 [ 12.515510] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8fc1b80b784c [ 12.515512] RBP: ffffa9d2c28e76a0 R08: 0000000000028200 R09: ffffffffc07af588 [ 12.515513] R10: ffff8fc1cc594000 R11: ffff8fc1ba605ff0 R12: ffff8fc1b80b784c [ 12.515514] R13: ffff8fc1b80b77c8 R14: ffff8fc1bc255600 R15: 0000000000000040 [ 12.515516] FS: 00007f2fafc505c0(0000) GS:ffff8fc1cec00000(0000) knlGS:0000000000000000 [ 12.515517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 12.515518] CR2: 0000000000000001 CR3: 00000003fe150000 CR4: 00000000003406e0 [ 12.515520] Call Trace: [ 12.515524] set_page_dirty+0x5e/0xb0 [ 12.515541] btrfs_dirty_pages+0x11f/0x2a0 [btrfs] [ 12.515562] ? io_ctl_set_crc+0x5e/0xf0 [btrfs] [ 12.515576] __btrfs_write_out_cache+0x3aa/0x470 [btrfs] [ 12.515590] btrfs_write_out_cache+0x9a/0xf0 [btrfs] [ 12.515600] btrfs_write_dirty_block_groups+0x293/0x3a0 [btrfs] [ 12.515611] ? btrfs_run_delayed_refs+0xa7/0x190 [btrfs] [ 12.515622] commit_cowonly_roots+0x21a/0x2c0 [btrfs] [ 12.515634] btrfs_commit_transaction+0x32e/0x8c0 [btrfs] [ 12.515647] btrfs_recover_log_trees+0x392/0x430 [btrfs] [ 12.515660] ? replay_dir_deletes+0x2a0/0x2a0 [btrfs] [ 12.515671] open_ctree+0x1b2c/0x1bb0 [btrfs] [ 12.515681] btrfs_mount_root+0x4ff/0x650 [btrfs] [ 12.515683] ? cpumask_next+0x1b/0x20 [ 12.515685] ? pcpu_alloc+0x1bd/0x610 [ 12.515687] mount_fs+0x51/0x165 [ 12.515689] vfs_kern_mount.part.38+0x5d/0x110 [ 12.515691] vfs_kern_mount+0x13/0x20 [ 12.515700] btrfs_mount+0x16f/0x860 [btrfs] [ 12.515702] ? pcpu_block_update_hint_alloc+0x1af/0x200 [ 12.515703] ? pcpu_alloc_area+0xed/0x140 [ 12.515704] ? pcpu_next_unpop+0x3c/0x50 [ 12.515706] ? cpumask_next+0x1b/0x20 [ 12.515707] ? pcpu_alloc+0x1bd/0x610 [ 12.515708] mount_fs+0x51/0x165 [ 12.515709] ? mount_fs+0x51/0x165 [ 12.515711] vfs_kern_mount.part.38+0x5d/0x110 [ 12.515712] do_mount+0x22f/0xd50 [ 12.515714] ? __check_object_size+0x166/0x192 [ 12.515716] ? memdup_user+0x4f/0x80 [ 12.515717] ksys_mount+0xb6/0xd0 [ 12.515718] __x64_sys_mount+0x25/0x30 [ 12.515720] do_syscall_64+0x5a/0x110 [ 12.515722] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 12.515723] RIP: 0033:0x7f2fafb82aca [ 12.515725] Code: 48 8b 0d c9 53 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 96 53 0c 00 f7 d8 64 89 01 48 [ 12.515726] RSP: 002b:00007ffde16c06c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 12.515727] RAX: ffffffffffffffda RBX: 0000000000008401 RCX: 00007f2fafb82aca [ 12.515728] RDX: 00007ffde16c2dd5 RSI: 00007ffde16c2df8 RDI: 00007ffde16c2de9 [ 12.515728] RBP: 00007f2fafc50540 R08: 0000000000000000 R09: 0000000000000000 [ 12.515729] R10: 0000000000008401 R11: 0000000000000202 R12: 0000000000000000 [ 12.515730] R13: 0000000000000000 R14: 00007ffde16c0938 R15: 0000000000000000 [ 12.515731] Modules linked in: btrfs xor zstd_compress raid6_pq libcrc32c nls_iso8859_1 dm_mirror dm_region_hash dm_log uas usb_storage hid_generic usbhid hid amdgpu chash amd_iommu_v2 gpu_sched i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm r8169 i2c_piix4 ahci nvme realtek libahci nvme_core wmi gpio_amdpt gpio_generic [ 12.515742] CR2: 0000000000000001 [ 12.515744] ---[ end trace 3e026a4bcaf67667 ]--- [ 12.515745] RIP: 0010:__set_page_dirty_buffers+0x4c/0x100 [ 12.515746] Code: 84 00 00 00 49 89 c5 4c 89 e7 e8 df 71 73 00 48 8b 03 f6 c4 20 74 28 48 8b 03 f6 c4 20 0f 84 ae 00 00 00 48 8b 43 28 48 89 c2 <48> 8b 0a 83 e1 02 75 04 f0 80 0a 02 48 8b 52 08 48 39 d0 75 eb 48 [ 12.515747] RSP: 0018:ffffa9d2c28e7688 EFLAGS: 00010202 [ 12.515748] RAX: 0000000000000001 RBX: ffffe34f45261300 RCX: 0000000000000000 [ 12.515749] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8fc1b80b784c [ 12.515750] RBP: ffffa9d2c28e76a0 R08: 0000000000028200 R09: ffffffffc07af588 [ 12.515750] R10: ffff8fc1cc594000 R11: ffff8fc1ba605ff0 R12: ffff8fc1b80b784c [ 12.515751] R13: ffff8fc1b80b77c8 R14: ffff8fc1bc255600 R15: 0000000000000040 [ 12.515752] FS: 00007f2fafc505c0(0000) GS:ffff8fc1cec00000(0000) knlGS:0000000000000000 [ 12.515753] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 12.515754] CR2: 0000000000000001 CR3: 00000003fe150000 CR4: 00000000003406e0
