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: 5328 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+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 5e 78 6b fe 48 c7 c7 a0 fc ea 8b 48 c7 c6 99 f8 ea 8b ba 96 02 00 00 48 c7 c1 c0 fd ea 8b e8 bf 9f ce fd 90 <0f> 0b e8 37 78 6b fe 48 c7 c7 80 fe ea 8b e8 ab 9f ce fd 48 c7 c7
RSP: 0000:ffffc9000ae25e40 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 247b13d6cf2f3a00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000ae25f68 R08: ffffc9000ae25bc7 R09: 1ffff920015c4b78
R10: dffffc0000000000 R11: fffff520015c4b79 R12: 1ffff920002b5000
R13: ffffc900015a8000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7517cdb6c0(0000) GS:ffff88808cce8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 0000000012a51000 CR4: 0000000000352ef0
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:2145
 block_write_begin+0x8d/0x120 fs/buffer.c:2256
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4314
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4457
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0xb89/0x12d0 fs/coredump.c:1372
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2111
 coredump_write+0x1219/0x1950 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x369e/0x4270 fs/coredump.c:1200
 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:41 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x176/0x620 kernel/entry/common.c:196
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f7516d9aec1
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:0000000000000050 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f7517015fa0 RCX: 00007f7516d9aeb9
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000000000000
RBP: 00007f7516e08c1f R08: 00002000000001c0 R09: 00002000000001c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7517016038 R14: 00007f7517015fa0 R15: 00007fff6071f338
 </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 5e 78 6b fe 48 c7 c7 a0 fc ea 8b 48 c7 c6 99 f8 ea 8b ba 96 02 00 00 48 c7 c1 c0 fd ea 8b e8 bf 9f ce fd 90 <0f> 0b e8 37 78 6b fe 48 c7 c7 80 fe ea 8b e8 ab 9f ce fd 48 c7 c7
RSP: 0000:ffffc9000ae25e40 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 247b13d6cf2f3a00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000ae25f68 R08: ffffc9000ae25bc7 R09: 1ffff920015c4b78
R10: dffffc0000000000 R11: fffff520015c4b79 R12: 1ffff920002b5000
R13: ffffc900015a8000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7517cdb6c0(0000) GS:ffff88808cce8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 0000000012a51000 CR4: 0000000000352ef0