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 NOPTI
CPU: 0 UID: 0 PID: 14723 Comm: syz.4.2100 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 3e 16 67 fe 48 c7 c7 a0 5c 0b 8c 48 c7 c6 99 58 0b 8c ba 96 02 00 00 48 c7 c1 c0 5d 0b 8c e8 5f 32 c9 fd 90 <0f> 0b e8 17 16 67 fe 48 c7 c7 80 5e 0b 8c e8 4b 32 c9 fd 48 c7 c7
RSP: 0018:ffffc90005bb5e00 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: d287197e7cdf2600
RDX: ffffc900065c3000 RSI: 0000000000010229 RDI: 000000000001022a
RBP: ffffc90005bb5f28 R08: ffffc90005bb5b87 R09: 1ffff92000b76b70
R10: dffffc0000000000 R11: fffff52000b76b71 R12: 1ffff92000527400
R13: ffffc9000293a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fbdb38f76c0(0000) GS:ffff888125463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055de8c5ca138 CR3: 000000002b438000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1256
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc95/0x1020 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x358/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2142
 block_write_begin+0x8d/0x120 fs/buffer.c:2253
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4319
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4462
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1299 [inline]
 dump_user_range+0xb89/0x12d0 fs/coredump.c:1373
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2110
 coredump_write+0x1216/0x1910 fs/coredump.c:1050
 do_coredump fs/coredump.c:1127 [inline]
 vfs_coredump+0x36a9/0x4280 fs/coredump.c:1201
 get_signal+0x1107/0x1330 kernel/signal.c:3019
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdb299c799
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:00007fbdb38f70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fbdb2c15fa8 RCX: 00007fbdb299c799
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbdb2c15fac
RBP: 00007fbdb2c15fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000200000003000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdb2c16038 R14: 00007fffe3871a10 R15: 00007fffe3871af8
 </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 3e 16 67 fe 48 c7 c7 a0 5c 0b 8c 48 c7 c6 99 58 0b 8c ba 96 02 00 00 48 c7 c1 c0 5d 0b 8c e8 5f 32 c9 fd 90 <0f> 0b e8 17 16 67 fe 48 c7 c7 80 5e 0b 8c e8 4b 32 c9 fd 48 c7 c7
RSP: 0018:ffffc90005bb5e00 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: d287197e7cdf2600
RDX: ffffc900065c3000 RSI: 0000000000010229 RDI: 000000000001022a
RBP: ffffc90005bb5f28 R08: ffffc90005bb5b87 R09: 1ffff92000b76b70
R10: dffffc0000000000 R11: fffff52000b76b71 R12: 1ffff92000527400
R13: ffffc9000293a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fbdb38f76c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556f13c88008 CR3: 000000002b438000 CR4: 0000000000350ef0