------------[ cut here ]------------
WARNING: CPU: 1 PID: 7849 at fs/jfs/jfs_dmap.c:2875 dbAdjTree+0x454/0x4e0
Modules linked in:
CPU: 1 UID: 0 PID: 7849 Comm: syz.3.400 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:dbAdjTree+0x454/0x4e0
Code: 5a ff ff ff e8 cd af 81 fe eb 05 e8 c6 af 81 fe 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 ad af 81 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: 0000:ffffc90002e96220 EFLAGS: 00010293
RAX: ffffffff833dfc03 RBX: ffff88802829a010 RCX: ffff88801c7b5640
RDX: 0000000000000000 RSI: 0000000000000155 RDI: 0000000000002057
RBP: 0000000000002057 R08: 0000000000000000 R09: 1ffffd40001414d0
R10: dffffc0000000000 R11: fffff940001414d1 R12: ffff88802829a018
R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f459e03e6c0(0000) GS:ffff8881a3c24000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f459e01cfc8 CR3: 000000002fca8000 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
 __block_write_begin_int+0x6b5/0x1900
 block_write_begin+0x8a/0x120
 jfs_write_begin+0x35/0x80
 generic_perform_write+0x2c5/0x900
 generic_file_write_iter+0x117/0x550
 __kernel_write_iter+0x393/0x860
 dump_user_range+0x8a0/0xc90
 elf_core_dump+0x337b/0x3990
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1a4b/0x2ab0
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:00002000000002c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f459d3b5fa0 RCX: 00007f459d18ebe9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000001000000
RBP: 00007f459d211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f459d3b6038 R14: 00007f459d3b5fa0 R15: 00007ffda50ea828
 </TASK>
