BUG at fs/jfs/jfs_txnmgr.c:663 assert(last)
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kernel BUG at fs/jfs/jfs_txnmgr.c:663!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 13680 Comm: syz.6.1333 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 ee 15 66 fe 48 c7 c7 a0 f1 0b 8c 48 c7 c6 99 ed 0b 8c ba 97 02 00 00 48 c7 c1 c0 f2 0b 8c e8 3f b2 c7 fd 90 <0f> 0b e8 c7 15 66 fe 48 c7 c7 80 f3 0b 8c e8 2b b2 c7 fd 48 c7 c7
RSP: 0018:ffffc900046c5e40 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 249986f5c6d61e00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900046c5f68 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1cfd318 R12: 1ffff9200052f400
R13: ffffc9000297a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f9cbd2376c0(0000) GS:ffff88812535c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffe70 CR3: 000000007c810000 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:2035
 block_write_begin+0x8d/0x120 fs/buffer.c:2146
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4468
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0xc19/0x12c0 fs/coredump.c:1378
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2109
 coredump_write+0x1216/0x1910 fs/coredump.c:1053
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x3807/0x4530 fs/coredump.c:1206
 get_signal+0x1107/0x1330 kernel/signal.c:3022
 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 kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:283 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:352 [inline]
 irqentry_exit+0x188/0x700 kernel/entry/common.c:219
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f9cbc39c821
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f9cbc615fa0 RCX: 00007f9cbc39c819
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f9cbc432c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f9cbc616038 R14: 00007f9cbc615fa0 R15: 00007ffce21626b8
 </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 ee 15 66 fe 48 c7 c7 a0 f1 0b 8c 48 c7 c6 99 ed 0b 8c ba 97 02 00 00 48 c7 c1 c0 f2 0b 8c e8 3f b2 c7 fd 90 <0f> 0b e8 c7 15 66 fe 48 c7 c7 80 f3 0b 8c e8 2b b2 c7 fd 48 c7 c7
RSP: 0018:ffffc900046c5e40 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 249986f5c6d61e00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900046c5f68 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1cfd318 R12: 1ffff9200052f400
R13: ffffc9000297a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f9cbd2376c0(0000) GS:ffff88812535c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9cbd194ff8 CR3: 000000007c810000 CR4: 00000000003526f0