general protection fault in __gfs2_trans_begin

Status: upstream: reported C repro on 2025/08/21 06:50
Subsystems: gfs2
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+a3a4e5eee651210c6887@syzkaller.appspotmail.com
First crash: 415d, last: 4d02h
Cause bisection: failed (error log, bisect log)
  
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ID Workflow Result Correct Bug Created Started Finished Revision
019e7642 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ general protection fault in __gfs2_trans_begin 2026/05/21 11:00 2026/05/21 11:00 2026/05/21 12:06 cf874a1c
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly gfs2 report (Apr 2026) 0 (1) 2026/04/22 09:08
[syzbot] Monthly gfs2 report (Mar 2026) 0 (1) 2026/03/23 08:58
[syzbot] [gfs2?] general protection fault in __gfs2_trans_begin 0 (1) 2025/08/21 06:50
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/11/21 00:49 43m retest repro linux-next no crash log
2025/09/05 05:21 23m retest repro linux-next report log

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]
CPU: 0 UID: 0 PID: 20912 Comm: kworker/0:1H Tainted: G S           L      syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: gfs2-glock/syz:syz glock_work_func
RIP: 0010:__gfs2_trans_begin+0x3b2/0xb80 fs/gfs2/trans.c:73
Code: 80 3c 02 00 0f 85 ee 06 00 00 4c 8b a5 e0 09 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 8c 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 bd
RSP: 0018:ffffc900033d7930 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: ffffc900033d7a18 RCX: ffffffff8492c488
RDX: 0000000000000011 RSI: ffffffff8492c496 RDI: 000000000000008c
RBP: ffff888034034000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880340340a8 R14: 1ffff9200067af2a R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff888123bdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555585aa19f8 CR3: 000000008bb27000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 gfs2_ail_empty_gl+0x239/0x2d0 fs/gfs2/glops.c:125
 inode_go_sync+0x21d/0x5a0 fs/gfs2/glops.c:332
 do_xmote+0x1da/0x680 fs/gfs2/glock.c:688
 run_queue+0x555/0x6a0 fs/gfs2/glock.c:784
 glock_work_func+0x127/0x4d0 fs/gfs2/glock.c:1011
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__gfs2_trans_begin+0x3b2/0xb80 fs/gfs2/trans.c:73
Code: 80 3c 02 00 0f 85 ee 06 00 00 4c 8b a5 e0 09 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 8c 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 bd
RSP: 0018:ffffc900033d7930 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: ffffc900033d7a18 RCX: ffffffff8492c488
RDX: 0000000000000011 RSI: ffffffff8492c496 RDI: 000000000000008c
RBP: ffff888034034000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880340340a8 R14: 1ffff9200067af2a R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff888123bdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60b6967000 CR3: 000000005993e000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	0f 85 ee 06 00 00    	jne    0x6f8
   a:	4c 8b a5 e0 09 00 00 	mov    0x9e0(%rbp),%r12
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	49 8d bc 24 8c 00 00 	lea    0x8c(%r12),%rdi
  22:	00
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2e:	48 89 f8             	mov    %rdi,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85                   	.byte 0x85
  3f:	bd                   	.byte 0xbd

Crashes (161):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/18 02:02 upstream ff68e5f557f6 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/08/09 21:02 upstream b9b3e33b70b7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/07/30 07:56 upstream 11028ab62899 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/07/21 21:50 upstream b95f03f04d47 7c5de9c3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/07/13 16:55 upstream a13c140cc289 a870962e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/07/11 15:14 upstream d96fcfe1b7f9 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/07/10 11:29 upstream 2c7c88a412aa 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/07/08 10:30 upstream 0e35b9b6ec0f 88a4b44c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/26 17:47 upstream 4edcdefd4083 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/21 23:10 upstream 8cd8cf7a07e5 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/06/18 13:28 upstream e771677c937d a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/18 01:34 upstream e771677c937d b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/16 20:10 upstream 6b5a2b7d9bc1 0e4b3e40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/13 22:07 upstream 2b07ea76fd28 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/11 11:25 upstream 9716c086c8e8 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/10 17:26 upstream acb7500801e9 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/06/09 19:18 upstream 2d3090a8aeb5 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/06/03 17:54 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/05/22 09:09 upstream 6779b50faa56 e195359d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/05/21 12:52 upstream 8bc67e4db64a e195359d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/05/08 22:23 upstream 81d6f7807536 0c5a8d8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/04/27 22:04 upstream 254f49634ee1 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/16 05:40 upstream aec2f682d47c df15c5f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/14 22:03 upstream d60bc1401583 362d1323 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/14 08:50 upstream 0f0013213293 1a086e7c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/13 23:33 upstream 0f0013213293 1a086e7c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/12 21:53 upstream f5459048c38a 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/12 06:00 upstream e753c16cb3dd 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/10 08:20 upstream 9a9c8ce300cd 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/04/09 14:06 upstream 7f87a5ea75f0 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/09 12:42 upstream 7f87a5ea75f0 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/09 08:41 upstream 7f87a5ea75f0 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/07 17:51 upstream bfe62a454542 628666c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/04/07 11:11 upstream bfe62a454542 628666c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/07 06:35 upstream bfe62a454542 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/06 11:02 upstream 591cd656a1bf 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/06 04:36 upstream 1791c390149f 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/05 15:18 upstream 3aae9383f42f 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/05 08:39 upstream 3aae9383f42f 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/04 11:25 upstream 7ca6d1cfec80 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/03 07:06 upstream d8a9a4b11a13 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/02 15:38 upstream 9147566d8016 8b15d4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2026/04/01 04:49 upstream dbf00d8d23b4 fb8b2c26 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2025/07/02 19:44 upstream b4911fb0b060 0cd59a8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in __gfs2_trans_begin
2025/09/26 05:57 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in __gfs2_trans_begin
2026/04/04 02:21 linux-next cc13002a9f98 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in __gfs2_trans_begin
2026/04/01 20:01 linux-next bd0f139e5fc1 0285fe54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in __gfs2_trans_begin
2025/08/21 06:50 linux-next 5303936d609e 0b9605c8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-linux-next-kasan-gce-root general protection fault in __gfs2_trans_begin
* Struck through repros no longer work on HEAD.