UFO tlock:0xffffc9000288a090
BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:662!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5110 Comm: syz.1.150 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:txLock+0x1cbd/0x2090 fs/jfs/jfs_txnmgr.c:662
Code: fe e9 29 f8 ff ff e8 d2 b6 92 fe 48 c7 c7 40 3c a6 8a 48 c7 c6 39 38 a6 8a ba 96 02 00 00 48 c7 c1 40 3d a6 8a e8 f3 3c 17 07 <0f> 0b e8 ac b6 92 fe 48 c7 c7 00 3e a6 8a e8 e0 3c 17 07 48 c7 c7
RSP: 0018:ffffc9000d826760 EFLAGS: 00010246
RAX: 000000000000002b RBX: ffffc9000288a000 RCX: 7be98bf12f63cb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000d8268c0 R08: dffffc0000000000 R09: fffff52001b04c8d
R10: fffff52001b04c8d R11: 1ffff92001b04c8c R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff92000511400
FS:  00007f96899106c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06e89ed000 CR3: 000000001de44000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 diWrite+0x43c/0x1600 fs/jfs/jfs_imap.c:654
 txCommit+0x84b/0x51c0 fs/jfs/jfs_txnmgr.c:1256
 jfs_commit_inode+0x2ec/0x520 fs/jfs/inode.c:114
 extAlloc+0xb97/0xf30 fs/jfs/jfs_extent.c:172
 jfs_get_block+0x343/0xab0 fs/jfs/inode.c:254
 __block_write_begin_int+0x54b/0x1a70 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x96/0x1e0 fs/buffer.c:2102
 jfs_write_begin+0x31/0x70 fs/jfs/inode.c:310
 generic_perform_write+0x2f7/0x5a0 mm/filemap.c:3862
 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960
 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989
 __kernel_write_iter+0x26d/0x630 fs/read_write.c:517
 dump_emit_page fs/coredump.c:950 [inline]
 dump_user_range+0x3ea/0x7f0 fs/coredump.c:977
 elf_core_dump+0x2f77/0x3490 fs/binfmt_elf.c:2354
 do_coredump+0x15ff/0x22b0 fs/coredump.c:824
 get_signal+0x10aa/0x1350 kernel/signal.c:2857
 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
 exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1490
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x21d602
Code: Unable to access opcode bytes at 0x21d5d8.
RSP: 002b:0000200000000238 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f9688be5fa0 RCX: 00007f968898f749
RDX: 0000200000000340 RSI: 0000200000000230 RDI: 0000000000200000
RBP: 00007f9688a13f91 R08: 00002000000004c0 R09: 00002000000004c0
R10: 0000200000000480 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f9688be6038 R14: 00007f9688be5fa0 R15: 00007ffe3544e068
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1cbd/0x2090 fs/jfs/jfs_txnmgr.c:662
Code: fe e9 29 f8 ff ff e8 d2 b6 92 fe 48 c7 c7 40 3c a6 8a 48 c7 c6 39 38 a6 8a ba 96 02 00 00 48 c7 c1 40 3d a6 8a e8 f3 3c 17 07 <0f> 0b e8 ac b6 92 fe 48 c7 c7 00 3e a6 8a e8 e0 3c 17 07 48 c7 c7
RSP: 0018:ffffc9000d826760 EFLAGS: 00010246
RAX: 000000000000002b RBX: ffffc9000288a000 RCX: 7be98bf12f63cb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000d8268c0 R08: dffffc0000000000 R09: fffff52001b04c8d
R10: fffff52001b04c8d R11: 1ffff92001b04c8c R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff92000511400
FS:  00007f96899106c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06e89f7000 CR3: 000000001de44000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400