UFO tlock:0xffffc900015992d0
BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:662!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5346 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 3e 96 6f fe 48 c7 c7 e0 a7 c5 8b 48 c7 c6 d9 a3 c5 8b ba 96 02 00 00 48 c7 c1 00 a9 c5 8b e8 cf a9 d4 fd 90 <0f> 0b e8 17 96 6f fe 48 c7 c7 c0 a9 c5 8b e8 bb a9 d4 fd 48 c7 c7
RSP: 0018:ffffc9000c576fe0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: b54a4aabe683bb00
RDX: ffffc90020f72000 RSI: 0000000000014db2 RDI: 0000000000014db3
RBP: ffffc9000c577108 R08: ffffc9000c576d67 R09: 1ffff920018aedac
R10: dffffc0000000000 R11: fffff520018aedad R12: 1ffff920002b3200
R13: ffffc90001599000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007ffb069366c0(0000) GS:ffff88808cfff000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001e000 CR3: 0000000012a47000 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
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:686
 ksys_write+0x150/0x270 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb0599acb9
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:00007ffb06936028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffb05c15fa0 RCX: 00007ffb0599acb9
RDX: 0000000000032600 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007ffb05a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb05c16038 R14: 00007ffb05c15fa0 R15: 00007fff54272858
 </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 96 6f fe 48 c7 c7 e0 a7 c5 8b 48 c7 c6 d9 a3 c5 8b ba 96 02 00 00 48 c7 c1 00 a9 c5 8b e8 cf a9 d4 fd 90 <0f> 0b e8 17 96 6f fe 48 c7 c7 c0 a9 c5 8b e8 bb a9 d4 fd 48 c7 c7
RSP: 0018:ffffc9000c576fe0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: b54a4aabe683bb00
RDX: ffffc90020f72000 RSI: 0000000000014db2 RDI: 0000000000014db3
RBP: ffffc9000c577108 R08: ffffc9000c576d67 R09: 1ffff920018aedac
R10: dffffc0000000000 R11: fffff520018aedad R12: 1ffff920002b3200
R13: ffffc90001599000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007ffb069366c0(0000) GS:ffff88808cfff000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000010 CR3: 0000000012a47000 CR4: 0000000000352ef0