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From: Christian Pernegger <pernegger@gmail.com>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: first it froze, now the (btrfs) root fs won't mount ...
Date: Sun, 20 Oct 2019 00:34:14 +0200	[thread overview]
Message-ID: <CAKbQEqG35D_=8raTFH75-yCYoqH2OvpPEmpj2dxgo+PTc=cfhA@mail.gmail.com> (raw)
In-Reply-To: <CAKbQEqE7xN1q3byFL7-_pD=_pGJ0Vm9pj7d-g+rRgtONeH-GrA@mail.gmail.com>

[Please CC me, I'm not on the list.]

Hello,

I'm afraid I could use some help.

The affected machine froze during a game, was entirely unresponsive
locally, though ssh still worked. For completeness' sake, dmesg had:
[110592.128512] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0
timeout, signaled seq=3404070, emitted seq=3404071
[110592.128545] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process
information: process Xorg pid 1191 thread Xorg:cs0 pid 1204
[110592.128549] amdgpu 0000:0c:00.0: GPU reset begin!
[110592.138530] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx
timeout, signaled seq=13149116, emitted seq=13149118
[110592.138577] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process
information: process Overcooked.exe pid 4830 thread dxvk-submit pid
4856
[110592.138579] amdgpu 0000:0c:00.0: GPU reset begin!

Oh well, I thought, and "shutdown -h now" it. That quit my ssh session
and locked me out, but otherwise didn't take, no reboot, still frozen.
Alt-SysRq-REISUB it was. That did it.

Only now all I get is a rescue shell, the pertinent messages look to
be [everything is copied off the screen by hand]:
[...]
BTRFS info [...]: disk space caching is enabled
BTRFS info [...]: has skinny extents
BTRFS error [...]: bad tree block start, want [big number] have 0
BTRFS error [...]: failed to read block groups: -5
BTRFS error [...]: open_ctree failed

Mounting with -o ro,usebackuproot doesn't change anything.

running btrfs check gives:
checksum verify failed on [same big number] found [8 digits hex] wanted 00000000
checksum verify failed on [same big number] found [8 digits hex] wanted 00000000
bytenr mismatch, want=[same big number], have=0
ERROR: cannot open filesystem.

That's all I've got, I'd really appreciate some help. There's hourly
snapshots courtesy of Timeshift, though I have a feeling those won't
help ...

Oh, it's a recent Linux Mint 19.2 install, default layout (@, @home),
Timeshift enabled; on a single device (NVMe). HWE kernel (Kernel
5.0.0-31-generic), btrfs-progs 4.15.1.

TIA,
Christian

       reply	other threads:[~2019-10-19 22:46 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAKbQEqE7xN1q3byFL7-_pD=_pGJ0Vm9pj7d-g+rRgtONeH-GrA@mail.gmail.com>
2019-10-19 22:34 ` Christian Pernegger [this message]
2019-10-20  0:38   ` first it froze, now the (btrfs) root fs won't mount Qu Wenruo
2019-10-20 10:11     ` Christian Pernegger
2019-10-20 10:22       ` Christian Pernegger
2019-10-20 10:28         ` Qu Wenruo
2019-10-21 10:47           ` Christian Pernegger
2019-10-21 10:55             ` Qu Wenruo
2019-10-21 11:47             ` Austin S. Hemmelgarn
2019-10-21 13:02               ` Christian Pernegger
2019-10-21 13:34                 ` Qu Wenruo
2019-10-22 22:56                   ` Christian Pernegger
2019-10-23  0:25                     ` Qu Wenruo
2019-10-23 11:31                     ` Austin S. Hemmelgarn
2019-10-24 10:41                       ` Christian Pernegger
2019-10-24 11:26                         ` Qu Wenruo
2019-10-24 11:40                         ` Austin S. Hemmelgarn
2019-10-25 16:43                           ` Christian Pernegger
2019-10-25 17:05                             ` Christian Pernegger
2019-10-25 17:16                               ` Austin S. Hemmelgarn
2019-10-25 17:12                             ` Austin S. Hemmelgarn
2019-10-26  0:01                             ` Qu Wenruo
2019-10-26  9:23                               ` Christian Pernegger
2019-10-26  9:41                                 ` Qu Wenruo
2019-10-26 13:52                                   ` Christian Pernegger
2019-10-26 14:06                                     ` Qu Wenruo
2019-10-26 16:30                                       ` Christian Pernegger
2019-10-27  0:46                                         ` Qu Wenruo
     [not found]                                           ` <CAKbQEqFne8eohE3gvCMm8LqA-KimFrwwvE5pUBTn-h-VBhJq1A@mail.gmail.com>
2019-10-27 13:38                                             ` Qu Wenruo
2019-10-21 14:02                 ` Austin S. Hemmelgarn

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