loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc90001077240
syzkaller0: entered promiscuous mode
syzkaller0: entered allmulticast mode
0: reclassify loop, rule prio 0, protocol 800
UFO tlock:0xffffc900010771b0
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: 5313 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 be cc 65 fe 48 c7 c7 20 6b 0b 8c 48 c7 c6 19 67 0b 8c ba 96 02 00 00 48 c7 c1 40 6c 0b 8c e8 af eb c7 fd 90 <0f> 0b e8 97 cc 65 fe 48 c7 c7 00 6d 0b 8c e8 9b eb c7 fd 48 c7 c7
RSP: 0018:ffffc9000e08efe0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 545b671f9ba5be00
RDX: ffffc9000ec12000 RSI: 0000000000018213 RDI: 0000000000018214
RBP: ffffc9000e08f108 R08: ffffc9000e08ed67 R09: 1ffff92001c11dac
R10: dffffc0000000000 R11: fffff52001c11dad R12: 1ffff9200020ee00
R13: ffffc90001077000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f71f6ff56c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001e000 CR3: 0000000032d00000 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:2142
 block_write_begin+0x8d/0x120 fs/buffer.c:2253
 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:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f71fab9c799
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:00007f71f6ff5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f71fae15fa0 RCX: 00007f71fab9c799
RDX: 00000000ffffff6a RSI: 0000200000000000 RDI: 000000000000000d
RBP: 00007f71fac32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f71fae16038 R14: 00007f71fae15fa0 R15: 00007fff6f16e128
 </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 be cc 65 fe 48 c7 c7 20 6b 0b 8c 48 c7 c6 19 67 0b 8c ba 96 02 00 00 48 c7 c1 40 6c 0b 8c e8 af eb c7 fd 90 <0f> 0b e8 97 cc 65 fe 48 c7 c7 00 6d 0b 8c e8 9b eb c7 fd 48 c7 c7
RSP: 0018:ffffc9000e08efe0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 545b671f9ba5be00
RDX: ffffc9000ec12000 RSI: 0000000000018213 RDI: 0000000000018214
RBP: ffffc9000e08f108 R08: ffffc9000e08ed67 R09: 1ffff92001c11dac
R10: dffffc0000000000 R11: fffff52001c11dad R12: 1ffff9200020ee00
R13: ffffc90001077000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f71f6ff56c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff6f16e408 CR3: 0000000032d00000 CR4: 0000000000352ef0