BUG at fs/jfs/jfs_txnmgr.c:663 assert(last)
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kernel BUG at fs/jfs/jfs_txnmgr.c:663!
CPU: 1 UID: 0 PID: 10433 Comm: syz.7.627 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 ce fe 6b fe 48 c7 c7 a0 7d 8b 8b 48 c7 c6 99 79 8b 8b ba 97 02 00 00 48 c7 c1 c0 7e 8b 8b e8 2f d9 ce fd 90 <0f> 0b e8 a7 fe 6b fe 48 c7 c7 80 7f 8b 8b e8 1b d9 ce fd 48 c7 c7
RSP: 0018:ffffc9000e74de40 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 4f075341d03bb000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000e74df68 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52001ce9b79 R12: 1ffff9200067c400
R13: ffffc900033e2000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8253cf66c0(0000) GS:ffff888126270000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32c23ffc CR3: 000000003c5a6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1257
 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:2042
 block_write_begin+0x8d/0x120 fs/buffer.c:2153
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2af/0x8b0 mm/filemap.c:4325
 generic_file_write_iter+0x14b/0x690 mm/filemap.c:4468
 __kernel_write_iter+0x427/0x890 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0xc1c/0x12c0 fs/coredump.c:1378
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2109
 coredump_write+0x1221/0x1920 fs/coredump.c:1053
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x380d/0x4540 fs/coredump.c:1206
 get_signal+0x1107/0x1330 kernel/signal.c:3022
 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
 irqentry_exit+0x289/0x760 kernel/entry/common.c:162
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f8255a7bbf9
Code: f8 77 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 27 01 00 00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 e9 30 01 00 00 66
RSP: 002b:00007f8253cf5e58 EFLAGS: 00010283
RAX: 0000000000000000 RBX: 00007f8253cf5ee0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000000
RBP: 0000200000000000 R08: 00002000000000c0 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f8253cf5ea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 ce fe 6b fe 48 c7 c7 a0 7d 8b 8b 48 c7 c6 99 79 8b 8b ba 97 02 00 00 48 c7 c1 c0 7e 8b 8b e8 2f d9 ce fd 90 <0f> 0b e8 a7 fe 6b fe 48 c7 c7 80 7f 8b 8b e8 1b d9 ce fd 48 c7 c7
RSP: 0018:ffffc9000e74de40 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 4f075341d03bb000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000e74df68 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52001ce9b79 R12: 1ffff9200067c400
R13: ffffc900033e2000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8253cf66c0(0000) GS:ffff888126270000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbcb99e7dac CR3: 000000003c5a6000 CR4: 00000000003526f0