BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
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kernel BUG at fs/jfs/jfs_txnmgr.c:662!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5679 Comm: syz.7.185 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:txLock+0x1a0d/0x1b10 fs/jfs/jfs_txnmgr.c:662
Code: fe e9 48 f8 ff ff e8 72 84 a6 fe 48 c7 c7 40 6c 62 8a 48 c7 c6 39 68 62 8a ba 96 02 00 00 48 c7 c1 40 6d 62 8a e8 13 25 df 06 <0f> 0b e8 4c 84 a6 fe 48 c7 c7 00 6e 62 8a e8 00 25 df 06 48 c7 c7
RSP: 0018:ffffc9000300f688 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 230cff7637b27400
RDX: ffffc9001649a000 RSI: 00000000000371ae RDI: 00000000000371af
RBP: 0000000000000000 R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000000
R13: ffffc900028b2000 R14: ffffc900028b2000 R15: 1ffff92000516400
FS:  00007fa9753fe6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4e62faff8 CR3: 000000007e048000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dtSplitRoot+0x34f/0x1510 fs/jfs/jfs_dtree.c:1927
 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
 dtInsert+0xe67/0x5830 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x758/0xad0 fs/jfs/namei.c:270
 vfs_mkdir+0x387/0x570 fs/namei.c:4073
 do_mkdirat+0x1df/0x5b0 fs/namei.c:4098
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa9771a3607
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fa9753fde58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fa9753fdee0 RCX: 00007fa9771a3607
RDX: 00000000000001ff RSI: 0000200000000240 RDI: 00000000ffffff9c
RBP: 0000200000000200 R08: 00002000000000c0 R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000200000000240
R13: 00007fa9753fdea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 339512a721be6bce ]---
RIP: 0010:txLock+0x1a0d/0x1b10 fs/jfs/jfs_txnmgr.c:662
Code: fe e9 48 f8 ff ff e8 72 84 a6 fe 48 c7 c7 40 6c 62 8a 48 c7 c6 39 68 62 8a ba 96 02 00 00 48 c7 c1 40 6d 62 8a e8 13 25 df 06 <0f> 0b e8 4c 84 a6 fe 48 c7 c7 00 6e 62 8a e8 00 25 df 06 48 c7 c7
RSP: 0018:ffffc9000300f688 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 230cff7637b27400
RDX: ffffc9001649a000 RSI: 00000000000371ae RDI: 00000000000371af
RBP: 0000000000000000 R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000000
R13: ffffc900028b2000 R14: ffffc900028b2000 R15: 1ffff92000516400
FS:  00007fa9753fe6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561a6b95e950 CR3: 000000007e048000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400