------------[ cut here ]------------
WARNING: CPU: 0 PID: 36 at fs/jfs/jfs_dmap.c:2875 dbAdjTree+0x454/0x4e0
Modules linked in:
CPU: 0 UID: 0 PID: 36 Comm: kworker/u10:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: writeback wb_workfn (flush-7:7)
RIP: 0010:dbAdjTree+0x454/0x4e0
Code: 5a ff ff ff e8 ad fb 80 fe eb 05 e8 a6 fb 80 fe 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 93 58 3e 08 cc e8 8d fb 80 fe 90 <0f> 0b 90 eb e1 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c e1 fb ff ff
RSP: 0018:ffffc900006aea60 EFLAGS: 00010293
RAX: ffffffff833eb353 RBX: ffff8880347c8010 RCX: ffff8881016b0000
RDX: 0000000000000000 RSI: 0000000000000155 RDI: 0000000000002057
RBP: 0000000000002057 R08: 0000000000000000 R09: 1ffffd40001a3e40
R10: dffffc0000000000 R11: fffff940001a3e41 R12: ffff8880347c8018
R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000155
FS:  0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdb467a9000 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dbSplit+0x132/0x200
 dbAllocBits+0x502/0xa60
 dbAllocDmap+0x6b/0x150
 dbAlloc+0x469/0xba0
 extAlloc+0x54a/0xfb0
 jfs_get_block+0x346/0xab0
 mpage_writepages+0x7eb/0x1cc0
 do_writepages+0x32e/0x550
 __writeback_single_inode+0x145/0xff0
 writeback_sb_inodes+0x6c7/0x1010
 wb_writeback+0x43b/0xaf0
 wb_workfn+0x409/0xef0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
