UFO tlock:0xffffc900028da048
BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:662!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 465 Comm: syz.5.6749 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:txLock+0x1b79/0x1cb0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 87 73 78 fe 48 c7 c7 e0 ad a4 8b 48 c7 c6 d9 a9 a4 8b ba 96 02 00 00 48 c7 c1 e0 ae a4 8b e8 18 01 e0 fd 90 <0f> 0b e8 60 73 78 fe 48 c7 c7 a0 af a4 8b e8 04 01 e0 fd 48 c7 c7
RSP: 0018:ffffc9000f32df80 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 689b2a34fd4e0000
RDX: ffffc90019d9c000 RSI: 0000000000011c4e RDI: 0000000000011c4f
RBP: ffffc9000f32e0a8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba684 R12: 1ffff9200051b400
R13: ffffc900028da000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8f10e396c0(0000) GS:ffff888126139000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0384ff80bc CR3: 0000000079b73000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x852/0x5430 fs/jfs/jfs_txnmgr.c:1256
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc3b/0xfb0 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
 block_write_begin+0x8a/0x120 fs/buffer.c:2256
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4254
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4397
 __kernel_write_iter+0x428/0x910 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
 elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
 coredump_write+0x116c/0x1900 fs/coredump.c:1049
 vfs_coredump+0x1db5/0x2a60 fs/coredump.c:1170
 get_signal+0x1108/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f0ff8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f10e390e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 00000000000000ca RBX: 00007f8f101e5fa8 RCX: 00007f8f0ff8f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f8f101e5fac
RBP: 00007f8f101e5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8f101e6038 R14: 00007ffc5df87720 R15: 00007ffc5df87808
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b79/0x1cb0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 87 73 78 fe 48 c7 c7 e0 ad a4 8b 48 c7 c6 d9 a9 a4 8b ba 96 02 00 00 48 c7 c1 e0 ae a4 8b e8 18 01 e0 fd 90 <0f> 0b e8 60 73 78 fe 48 c7 c7 a0 af a4 8b e8 04 01 e0 fd 48 c7 c7
RSP: 0018:ffffc9000f32df80 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 689b2a34fd4e0000
RDX: ffffc90019d9c000 RSI: 0000000000011c4e RDI: 0000000000011c4f
RBP: ffffc9000f32e0a8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba684 R12: 1ffff9200051b400
R13: ffffc900028da000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8f10e396c0(0000) GS:ffff888126139000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31d1bff8 CR3: 0000000079b73000 CR4: 0000000000350ef0