syzbot


kernel BUG in txEnd

Status: upstream: reported on 2025/10/29 03:17
Reported-by: syzbot+ee857a434ba2edd24408@syzkaller.appspotmail.com
First crash: 111d, last: 27d
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in txEnd (2) jfs -1 C error 234 20h48m 735d 0/29 upstream: reported C repro on 2024/02/13 15:23
upstream kernel BUG in txEnd jfs -1 C inconclusive done 6 759d 973d 25/29 fixed on 2024/01/30 15:47
linux-6.1 kernel BUG in txEnd origin:upstream -1 C error 11 1d10h 885d 0/3 upstream: reported C repro on 2023/09/16 10:44
linux-5.15 kernel BUG in txEnd origin:upstream -1 C error 5 32d 926d 0/3 upstream: reported C repro on 2023/08/06 15:29

Sample crash report:
ERROR: (device loop3): xtTruncate: XT_GETPAGE: xtree page corrupt
BUG at fs/jfs/jfs_txnmgr.c:529 assert(tblk->next == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:529!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 15665 Comm: syz.3.3110 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:txEnd+0x51e/0x520 fs/jfs/jfs_txnmgr.c:529
Code: fe e9 cc fe ff ff e8 91 6c 80 fe 48 c7 c7 40 0f 04 8b 48 c7 c6 39 0b 04 8b ba 11 02 00 00 48 c7 c1 80 0f 04 8b e8 22 55 70 07 <0f> 0b f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4
RSP: 0018:ffffc900034274e0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888079bca000 RCX: 4d10a7ae430f6d00
RDX: ffffc9001dc02000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90002619112 R08: ffffc900034270e7 R09: 1ffff92000684e1c
R10: dffffc0000000000 R11: fffff52000684e1d R12: 1ffff920004c3227
R13: dffffc0000000000 R14: ffffc90002619138 R15: 0000000000000001
FS:  00007f192f10e6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd3311e59a0 CR3: 000000002168b000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 jfs_truncate_nolock+0x235/0x2c0 fs/jfs/inode.c:397
 jfs_truncate fs/jfs/inode.c:418 [inline]
 jfs_write_failed+0x119/0x190 fs/jfs/inode.c:295
 jfs_direct_IO+0x1f1/0x220 fs/jfs/inode.c:348
 generic_file_direct_write+0x1d4/0x3e0 mm/filemap.c:3956
 __generic_file_write_iter+0x11b/0x230 mm/filemap.c:4112
 generic_file_write_iter+0xaf/0x2e0 mm/filemap.c:4152
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x738/0xc30 fs/read_write.c:860
 iter_file_splice_write+0x6a3/0xcb0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0xe8/0x130 fs/splice.c:1142
 splice_direct_to_actor+0x304/0x8c0 fs/splice.c:1088
 do_splice_direct+0x1d5/0x2f0 fs/splice.c:1194
 do_sendfile+0x5f2/0xef0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64+0x145/0x1a0 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f192e19acb9
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:00007f192f10e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f192e416090 RCX: 00007f192e19acb9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007f192e208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe85 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f192e416128 R14: 00007f192e416090 R15: 00007ffc380d5b18
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x51e/0x520 fs/jfs/jfs_txnmgr.c:529
Code: fe e9 cc fe ff ff e8 91 6c 80 fe 48 c7 c7 40 0f 04 8b 48 c7 c6 39 0b 04 8b ba 11 02 00 00 48 c7 c1 80 0f 04 8b e8 22 55 70 07 <0f> 0b f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4
RSP: 0018:ffffc900034274e0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888079bca000 RCX: 4d10a7ae430f6d00
RDX: ffffc9001dc02000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90002619112 R08: ffffc900034270e7 R09: 1ffff92000684e1c
R10: dffffc0000000000 R11: fffff52000684e1d R12: 1ffff920004c3227
R13: dffffc0000000000 R14: ffffc90002619138 R15: 0000000000000001
FS:  00007f192f10e6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd3311e59a0 CR3: 000000002168b000 CR4: 00000000003506e0

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/21 01:18 linux-6.6.y cbb31f77b879 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in txEnd
2025/10/29 03:17 linux-6.6.y 4a243110dc88 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in txEnd
2025/10/29 03:16 linux-6.6.y 4a243110dc88 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in txEnd
* Struck through repros no longer work on HEAD.