BUG at fs/jfs/jfs_txnmgr.c:663 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:663!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txLock+0x1bdb/0x1d10 fs/jfs/jfs_txnmgr.c:663
Code: e9 c5 f7 ff ff e8 f5 78 53 fe 48 c7 c7 e0 26 4e 8c 48 c7 c6 d9 22 4e 8c ba 97 02 00 00 48 c7 c1 00 28 4e 8c e8 a6 3c b3 fd 90 <0f> 0b e8 ce 78 53 fe 48 c7 c7 c0 28 4e 8c e8 92 3c b3 fd 48 c7 c7
RSP: 0018:ffffc9000ea36100 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 5a8dbb3910a8e200
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: ffffc9000ea36230 R08: ffffc9000ea35e87 R09: 1ffff92001d46bd0
R10: dffffc0000000000 R11: fffff52001d46bd1 R12: 0000000000000000
R13: ffffc90001082000 R14: 0000000000000000 R15: 1ffff92000210400
FS:  00007fc84d4296c0(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 0000000044854000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f60 fs/jfs/jfs_imap.c:654
 txCommit+0x83a/0x54a0 fs/jfs/jfs_txnmgr.c:1257
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc82/0x1010 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x351/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2030
 block_write_begin+0x8d/0x120 fs/buffer.c:2144
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4374
 generic_file_write_iter+0xae/0x330 mm/filemap.c:4517
 __kernel_write_iter+0x44a/0x8f0 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1293 [inline]
 dump_user_range+0xc19/0x12c0 fs/coredump.c:1367
 elf_core_dump+0x3485/0x3a90 fs/binfmt_elf.c:2106
 coredump_write+0x1290/0x1960 fs/coredump.c:1047
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x3764/0x4520 fs/coredump.c:1195
 get_signal+0x1094/0x12c0 kernel/signal.c:3097
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:101 [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+0x2ba/0x910 kernel/entry/common.c:165
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x491e22117535
Code: Unable to access opcode bytes at 0x491e2211750b.
RSP: 002b:0000200000000708 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc84c825fa0 RCX: 00007fc84c59e159
RDX: 0000200000000740 RSI: 0000200000000700 RDI: 0000000000002000
RBP: 00007fc84c63506b R08: 0000200000000d80 R09: 0000200000000d80
R10: 0000200000000780 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc84c826038 R14: 00007fc84c825fa0 R15: 00007ffd74461138
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1bdb/0x1d10 fs/jfs/jfs_txnmgr.c:663
Code: e9 c5 f7 ff ff e8 f5 78 53 fe 48 c7 c7 e0 26 4e 8c 48 c7 c6 d9 22 4e 8c ba 97 02 00 00 48 c7 c1 00 28 4e 8c e8 a6 3c b3 fd 90 <0f> 0b e8 ce 78 53 fe 48 c7 c7 c0 28 4e 8c e8 92 3c b3 fd 48 c7 c7
RSP: 0018:ffffc9000ea36100 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 5a8dbb3910a8e200
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: ffffc9000ea36230 R08: ffffc9000ea35e87 R09: 1ffff92001d46bd0
R10: dffffc0000000000 R11: fffff52001d46bd1 R12: 0000000000000000
R13: ffffc90001082000 R14: 0000000000000000 R15: 1ffff92000210400
FS:  00007fc84d4296c0(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc84d407ff8 CR3: 0000000044854000 CR4: 0000000000352ef0