BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
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kernel BUG at fs/jfs/jfs_txnmgr.c:662!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 7496 Comm: syz.5.180 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 5e c9 75 fe 48 c7 c7 20 62 6a 8b 48 c7 c6 19 5e 6a 8b ba 96 02 00 00 48 c7 c1 40 63 6a 8b e8 ef eb d9 fd 90 <0f> 0b e8 37 c9 75 fe 48 c7 c7 00 64 6a 8b e8 db eb d9 fd 48 c7 c7
RSP: 0018:ffffc900128ef540 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: aa63888ba636af00
RDX: ffffc9001ae63000 RSI: 0000000000003838 RDI: 0000000000003839
RBP: ffffc900128ef678 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200251de59 R12: 1ffff920006ab400
R13: ffffc9000355a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f2e85b6d6c0(0000) GS:ffff8881265c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555f203a28 CR3: 000000003b6f6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dtSplitRoot+0x36f/0x16c0 fs/jfs/jfs_dtree.c:1927
 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
 dtInsert+0xf19/0x5f10 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x783/0xb00 fs/jfs/namei.c:270
 vfs_mkdir+0x75d/0x870 fs/namei.c:5139
 do_mkdirat+0x281/0x4c0 fs/namei.c:5173
 __do_sys_mkdirat fs/namei.c:5195 [inline]
 __se_sys_mkdirat fs/namei.c:5193 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5193
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e87939d97
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:00007f2e85b6ce58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f2e85b6cee0 RCX: 00007f2e87939d97
RDX: 00000000000001ff RSI: 0000200000000040 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000200000000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f2e85b6cea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 5e c9 75 fe 48 c7 c7 20 62 6a 8b 48 c7 c6 19 5e 6a 8b ba 96 02 00 00 48 c7 c1 40 63 6a 8b e8 ef eb d9 fd 90 <0f> 0b e8 37 c9 75 fe 48 c7 c7 00 64 6a 8b e8 db eb d9 fd 48 c7 c7
RSP: 0018:ffffc900128ef540 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: aa63888ba636af00
RDX: ffffc9001ae63000 RSI: 0000000000003838 RDI: 0000000000003839
RBP: ffffc900128ef678 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200251de59 R12: 1ffff920006ab400
R13: ffffc9000355a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f2e85b6d6c0(0000) GS:ffff8881265c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555f203a28 CR3: 000000003b6f6000 CR4: 00000000003526f0