------------[ cut here ]------------
WARNING: CPU: 0 PID: 21233 at fs/jfs/jfs_dmap.c:2875 dbAdjTree+0x454/0x4e0 fs/jfs/jfs_dmap.c:2875
Modules linked in:
CPU: 0 UID: 0 PID: 21233 Comm: syz.8.3277 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:dbAdjTree+0x454/0x4e0 fs/jfs/jfs_dmap.c:2875
Code: 5a ff ff ff e8 7d 37 7c fe eb 05 e8 76 37 7c fe 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 7e 34 cc fd cc e8 5d 37 7c 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:ffffc90003e7e1c0 EFLAGS: 00010283
RAX: ffffffff83440c93 RBX: ffff8880668c0010 RCX: 0000000000080000
RDX: ffffc900121cf000 RSI: 00000000000082db RDI: 00000000000082dc
RBP: 0000000000002057 R08: 0000000000000000 R09: 1ffffd4000334600
R10: dffffc0000000000 R11: fffff94000334601 R12: ffff8880668c0018
R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000155
FS:  00007fae4c2306c0(0000) GS:ffff888125d0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80d7e79000 CR3: 00000000625e1000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 dbSplit+0x132/0x200 fs/jfs/jfs_dmap.c:2648
 dbAllocBits+0x502/0xa60 fs/jfs/jfs_dmap.c:2193
 dbAllocDmap+0x6b/0x150 fs/jfs/jfs_dmap.c:2034
 dbAlloc+0x469/0xba0 fs/jfs/jfs_dmap.c:805
 extBalloc fs/jfs/jfs_extent.c:336 [inline]
 extAlloc+0x54a/0xfb0 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
 block_write_begin+0x8a/0x120 fs/buffer.c:2256
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4242
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4385
 __kernel_write_iter+0x428/0x910 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
 elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
 coredump_write+0x116c/0x1900 fs/coredump.c:1049
 vfs_coredump+0x1db5/0x2a60 fs/coredump.c:1170
 get_signal+0x1108/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae4b38eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae4c2300e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 00000000000000ca RBX: 00007fae4b5e6098 RCX: 00007fae4b38eec9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fae4b5e609c
RBP: 00007fae4b5e6090 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fae4b5e6128 R14: 00007fff88e6ba30 R15: 00007fff88e6bb18
 </TASK>