syzbot


kernel BUG in jfs_flush_journal (3)

Status: upstream: reported on 2026/03/01 21:09
Subsystems: jfs
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+4c8d1f29732a21567e4e@syzkaller.appspotmail.com
First crash: 132d, last: 1d04h
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision Error
0f538560-8acb-4f1e-a34b-a298c8e1fd26 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ✅ kernel BUG in jfs_flush_journal (3) 2026/05/31 12:35 2026/05/31 12:35 2026/05/31 13:17 6b4a844333e83556da95d61d7f207e7ef5cd4bc6

			
		
6550b220-2343-4620-ba4c-c5f4d7a736f3 assessment-security 💥 kernel BUG in jfs_flush_journal (3) 2026/05/14 16:40 2026/05/14 16:40 2026/05/14 16:42 6ccb967e465e832a7bfd7a116ad00d52a0923a5d
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/151170a375c273e4d2...
truncated to first 200 bytes; open job for full error
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] kernel BUG in jfs_flush_journal (3) 0 (1) 2026/03/01 21:09
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in jfs_flush_journal -1 1 812d 812d 0/3 auto-obsoleted due to no activity on 2024/07/26 08:47
upstream kernel BUG in jfs_flush_journal (2) jfs -1 15 260d 763d 0/29 auto-obsoleted due to no activity on 2026/01/29 01:09
upstream kernel BUG in jfs_flush_journal jfs -1 2 1208d 1205d 0/29 auto-obsoleted due to no activity on 2023/07/16 07:52

Sample crash report:
BUG at fs/jfs/jfs_logmgr.c:1585 assert(list_empty(&log->cqueue))
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_logmgr.c:1585!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 14648 Comm: syz.2.1021 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:jfs_flush_journal+0xf2b/0xf50 fs/jfs/jfs_logmgr.c:1585
Code: e9 9e f5 ff ff e8 e5 5c 6c fe 48 c7 c7 00 5a 6b 8b 48 c7 c6 00 55 6b 8b ba 31 06 00 00 48 c7 c1 40 5a 6b 8b e8 16 a7 cf fd 90 <0f> 0b e8 be 5c 6c fe bf 02 00 00 00 e8 84 89 3b fe e9 a9 f7 ff ff
RSP: 0018:ffffc90005ddfb40 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: 7561d9bc22774e00
RDX: ffffc9001a000000 RSI: 0000000000005a74 RDI: 0000000000005a75
RBP: ffffc90005ddfc70 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000bbbf19 R12: 00000000000000c7
R13: ffff888067282218 R14: ffff888067282000 R15: ffff8880672822d8
FS:  00007ffa621766c0(0000) GS:ffff8881263a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f83e005beb8 CR3: 000000005de14000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_umount_rw+0x75/0x130 fs/jfs/jfs_umount.c:144
 jfs_reconfigure+0x6d3/0x990 fs/jfs/super.c:421
 reconfigure_super+0x232/0x8f0 fs/super.c:1080
 do_remount fs/namespace.c:3403 [inline]
 path_mount+0xd4b/0x1040 fs/namespace.c:4149
 do_mount fs/namespace.c:4170 [inline]
 __do_sys_mount fs/namespace.c:4386 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4363
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa63f1ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa62176028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffa64195fa0 RCX: 00007ffa63f1ce59
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007ffa63fb2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa64196038 R14: 00007ffa64195fa0 R15: 00007ffc63bd5ec8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:jfs_flush_journal+0xf2b/0xf50 fs/jfs/jfs_logmgr.c:1585
Code: e9 9e f5 ff ff e8 e5 5c 6c fe 48 c7 c7 00 5a 6b 8b 48 c7 c6 00 55 6b 8b ba 31 06 00 00 48 c7 c1 40 5a 6b 8b e8 16 a7 cf fd 90 <0f> 0b e8 be 5c 6c fe bf 02 00 00 00 e8 84 89 3b fe e9 a9 f7 ff ff
RSP: 0018:ffffc90005ddfb40 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: 7561d9bc22774e00
RDX: ffffc9001a000000 RSI: 0000000000005a74 RDI: 0000000000005a75
RBP: ffffc90005ddfc70 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000bbbf19 R12: 00000000000000c7
R13: ffff888067282218 R14: ffff888067282000 R15: ffff8880672822d8
FS:  00007ffa621766c0(0000) GS:ffff8881263a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f83e005beb8 CR3: 000000005de14000 CR4: 00000000003526f0

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/15 09:08 upstream 8cd9520d35a6 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/05/27 13:21 upstream eb3f4b7426cf 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/05/01 15:50 upstream 26fd6bff2c05 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/03/02 18:57 upstream 11439c4635ed b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/02/25 21:01 upstream d9d32e5bd5a4 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/07/07 11:42 linux-next 8e9685d3c41c 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in jfs_flush_journal
* Struck through repros no longer work on HEAD.