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general protection fault in btrfs_root_node

Status: upstream: reported C repro on 2024/09/03 16:42
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+9c3e0cdfbfe351b0bc0e@syzkaller.appspotmail.com
First crash: 299d, last: 13h43m
Cause bisection: introduced by (bisect log) :
commit 42437a6386ffeaaf200731e73d723ea491f3fe7d
Author: Josef Bacik <josef@toxicpanda.com>
Date: Fri Oct 16 15:29:18 2020 +0000

  btrfs: introduce mount option rescue=ignorebadroots

Crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_root_node (log)
Repro: C syz .config
  
▶ ▼ Discussions (9)
Title Replies (including bot) Last reply
[syzbot] Monthly btrfs report (Jun 2025) 0 (1) 2025/06/24 07:33
[syzbot] Monthly btrfs report (May 2025) 0 (1) 2025/05/24 10:05
[syzbot] Monthly btrfs report (Apr 2025) 0 (1) 2025/04/23 07:50
[syzbot] Monthly btrfs report (Mar 2025) 0 (1) 2025/03/22 18:47
[syzbot] Monthly btrfs report (Feb 2025) 0 (1) 2025/02/19 12:35
[syzbot] Monthly btrfs report (Jan 2025) 0 (1) 2025/01/20 08:14
[syzbot] Monthly btrfs report (Dec 2024) 0 (1) 2024/12/19 18:39
[syzbot] [btrfs?] general protection fault in btrfs_root_node 0 (5) 2024/11/12 10:47
[PATCH] btrfs: Added null check to extent_root variable 6 (6) 2024/09/04 21:31
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: null-ptr-deref Write in btrfs_root_node (2) origin:lts-only C done 37 10d 647d 0/3 upstream: reported C repro on 2023/09/18 04:34
linux-6.1 BUG: unable to handle kernel paging request in btrfs_root_node origin:upstream C 15 24d 241d 0/3 upstream: reported C repro on 2024/10/27 14:03
linux-5.15 KASAN: null-ptr-deref Write in btrfs_root_node 1 794d 794d 0/3 auto-obsoleted due to no activity on 2023/08/22 05:04
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/09/16 03:11 14m retest repro upstream report log
2024/09/04 02:12 19m ghanshyam1898@gmail.com patch upstream OK log
2024/09/04 01:43 0m ghanshyam1898@gmail.com patch upstream error
2024/09/04 01:38 0m ghanshyam1898@gmail.com patch upstream error

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 5825 Comm: syz-executor202 Not tainted 6.15.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193
Code: e7 1a e8 fd 48 83 c4 08 e8 ee 7a 99 07 89 c5 31 ff 89 c6 e8 b3 d1 09 fe 85 ed 74 17 e8 0a f5 f0 fd 84 c0 74 1c e8 61 cd 09 fe <42> 80 3c 2b 00 75 4b eb 51 e8 53 cd 09 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc9000449f750 EFLAGS: 00010293
RAX: ffffffff83b6237f RBX: 0000000000000003 RCX: ffff8880783d9e00
RDX: 0000000000000000 RSI: ffffffff8bc12220 RDI: ffffffff8bc121e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff83b6233c R12: ffffffff83b6233c
R13: dffffc0000000000 R14: 0000000000000018 R15: ffff8880327d5420
FS:  000055555a8cb380(0000) GS:ffff8881260f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005632094765f8 CR3: 000000003242e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:263
 btrfs_build_ref_tree+0x112/0x12b0 fs/btrfs/ref-verify.c:1006
 open_ctree+0x1d7e/0x2800 fs/btrfs/disk-io.c:3591
 btrfs_fill_super+0x19d/0x2e0 fs/btrfs/super.c:976
 btrfs_get_tree_super fs/btrfs/super.c:1901 [inline]
 btrfs_get_tree+0x107c/0x1620 fs/btrfs/super.c:2096
 vfs_get_tree+0x92/0x2b0 fs/super.c:1759
 fc_mount+0x1c/0xb0 fs/namespace.c:1289
 btrfs_get_tree_subvol fs/btrfs/super.c:2054 [inline]
 btrfs_get_tree+0x67d/0x1620 fs/btrfs/super.c:2097
 vfs_get_tree+0x92/0x2b0 fs/super.c:1759
 do_new_mount+0x24a/0xa40 fs/namespace.c:3881
 do_mount fs/namespace.c:4221 [inline]
 __do_sys_mount fs/namespace.c:4432 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe94ab38faa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd0daca588 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd0daca5a0 RCX: 00007fe94ab38faa
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 00007ffd0daca5a0
RBP: 00002000000000c0 R08: 00007ffd0daca5e0 R09: 00000000000055db
R10: 000000000001c005 R11: 0000000000000282 R12: 0000200000000080
R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffd0daca5e0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193
Code: e7 1a e8 fd 48 83 c4 08 e8 ee 7a 99 07 89 c5 31 ff 89 c6 e8 b3 d1 09 fe 85 ed 74 17 e8 0a f5 f0 fd 84 c0 74 1c e8 61 cd 09 fe <42> 80 3c 2b 00 75 4b eb 51 e8 53 cd 09 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc9000449f750 EFLAGS: 00010293
RAX: ffffffff83b6237f RBX: 0000000000000003 RCX: ffff8880783d9e00
RDX: 0000000000000000 RSI: ffffffff8bc12220 RDI: ffffffff8bc121e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff83b6233c R12: ffffffff83b6233c
R13: dffffc0000000000 R14: 0000000000000018 R15: ffff8880327d5420
FS:  000055555a8cb380(0000) GS:ffff8881261f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4dbd10e9c CR3: 000000003242e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	1a e8                	sbb    %al,%ch
   2:	fd                   	std
   3:	48 83 c4 08          	add    $0x8,%rsp
   7:	e8 ee 7a 99 07       	call   0x7997afa
   c:	89 c5                	mov    %eax,%ebp
   e:	31 ff                	xor    %edi,%edi
  10:	89 c6                	mov    %eax,%esi
  12:	e8 b3 d1 09 fe       	call   0xfe09d1ca
  17:	85 ed                	test   %ebp,%ebp
  19:	74 17                	je     0x32
  1b:	e8 0a f5 f0 fd       	call   0xfdf0f52a
  20:	84 c0                	test   %al,%al
  22:	74 1c                	je     0x40
  24:	e8 61 cd 09 fe       	call   0xfe09cd8a
* 29:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1) <-- trapping instruction
  2e:	75 4b                	jne    0x7b
  30:	eb 51                	jmp    0x83
  32:	e8 53 cd 09 fe       	call   0xfe09cd8a
  37:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1)
  3c:	75 3d                	jne    0x7b
  3e:	eb                   	.byte 0xeb

Crashes (497):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/26 19:23 upstream 0ff41df1cb26 874a1386 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs general protection fault in btrfs_root_node
2025/02/13 05:09 upstream 4dc1d1bec898 b27c2402 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs general protection fault in btrfs_root_node
2024/12/07 12:46 upstream b5f217084ab3 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs general protection fault in btrfs_root_node
2024/11/11 09:16 upstream 2d5404caa8c7 6b856513 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs general protection fault in btrfs_root_node
2025/05/27 11:53 upstream ddddf9d64f73 874a1386 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/02/09 05:16 upstream 9946eaf552b1 ef44b750 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2024/08/30 16:47 upstream 20371ba12063 db150e23 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/13 09:12 upstream 27605c8c0f69 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in btrfs_root_node
2025/06/25 06:12 upstream 7595b66ae9de 26d77996 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/23 22:29 upstream 86731a2a651e 1a7fb460 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/23 15:46 upstream 86731a2a651e d6cdfb8a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/23 07:59 upstream b67ec639010f d6cdfb8a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/22 12:35 upstream 739a6c93cc75 d6cdfb8a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/21 19:26 upstream 3f75bfff44be d6cdfb8a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/20 15:28 upstream 41687a5c6f8b 804b3919 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/20 10:19 upstream 41687a5c6f8b ed3e87f7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/19 22:02 upstream 24770983ccfe ed3e87f7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/18 23:44 upstream 52da431bf03b ed3e87f7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/16 10:44 upstream e04c78d86a96 5f4b362d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/15 02:16 upstream 4774cfe3543a 5f4b362d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/15 01:14 upstream 4774cfe3543a 5f4b362d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/14 00:29 upstream 27605c8c0f69 1f72c409 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/12 16:21 upstream 2c4a1f3fe03e 98683f8f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/12 07:33 upstream 488ef3560196 98683f8f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/12 05:54 upstream 488ef3560196 98683f8f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/11 13:32 upstream aef17cb3d3c4 5d7e17ca .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/10 10:16 upstream f09079bd04a9 4826c28e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/07 04:54 upstream c0c9379f235d 4826c28e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/05 22:42 upstream ec7714e49479 6b6b5f21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/05 15:38 upstream ec7714e49479 6b6b5f21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/04 22:39 upstream 1af80d00e1e0 6b6b5f21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/04 17:08 upstream 5abc7438f1e9 e565f08d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/04 11:22 upstream 5abc7438f1e9 e565f08d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/02 13:20 upstream cd2e103d57e5 aaaaf5ea .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/06/01 05:17 upstream 4cb6c8af8591 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/05/31 16:06 upstream 0f70f5b08a47 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/05/29 13:01 upstream 90b83efa6701 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/05/27 02:25 upstream ddddf9d64f73 874a1386 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/05/26 16:24 upstream 0ff41df1cb26 06877188 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/05/26 05:19 upstream d0c22de9995b 2d4582d0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in btrfs_root_node
2025/01/06 13:28 linux-next 8155b4ef3466 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in btrfs_root_node
2025/06/25 22:01 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/22 22:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/22 06:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/21 16:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/20 20:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e e3003213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/15 22:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/12 11:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/08 16:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/08 02:57 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/04 21:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e fd5e6e61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/02 03:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/06/01 13:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/05/31 14:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/05/31 10:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/05/31 09:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/05/30 17:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/05/28 12:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
2025/05/27 02:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in btrfs_root_node
* Struck through repros no longer work on HEAD.