loop0: detected capacity change from 0 to 32768
find_entry called with index = 0
read_mapping_page failed!
ERROR: (device loop0): txCommit: 
loop0: detected capacity change from 32768 to 32767
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2783:24
index 83886080 is out of range for type 's8[1365]' (aka 'signed char[1365]')
CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-02665-g1e26c5e28ca5 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:453
 dbJoin+0x2ed/0x310 fs/jfs/jfs_dmap.c:2783
 dbFreeBits+0x4ea/0xdd0 fs/jfs/jfs_dmap.c:2343
 dbFreeDmap fs/jfs/jfs_dmap.c:2092 [inline]
 dbFree+0x35c/0x680 fs/jfs/jfs_dmap.c:409
 txFreeMap+0x96a/0xd50 fs/jfs/jfs_txnmgr.c:2515
 xtTruncate+0xe82/0x32a0 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x47f/0x700 fs/jfs/namei.c:759
 jfs_evict_inode+0x362/0x440 fs/jfs/inode.c:153
 evict+0x4f9/0x9b0 fs/inode.c:810
 __dentry_kill+0x20d/0x630 fs/dcache.c:643
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1088
 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1115
 prune_dcache_sb+0x111/0x180 fs/dcache.c:1196
 super_cache_scan+0x3a8/0x510 fs/super.c:221
 do_shrink_slab+0x715/0x1140 mm/shrinker.c:437
 shrink_slab_memcg mm/shrinker.c:550 [inline]
 shrink_slab+0x87f/0x14e0 mm/shrinker.c:628
 drop_slab_node mm/vmscan.c:421 [inline]
 drop_slab+0x142/0x280 mm/vmscan.c:439
 drop_caches_sysctl_handler+0xbc/0x160 fs/drop_caches.c:68
 proc_sys_call_handler+0x617/0x950 fs/proc/proc_sysctl.c:601
 do_iter_readv_writev+0x71f/0x9d0 fs/read_write.c:-1
 vfs_writev+0x38d/0xbc0 fs/read_write.c:1055
 do_writev+0x1b8/0x360 fs/read_write.c:1101
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7d0638d169
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:00007f7d0719b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f7d065a5fa0 RCX: 00007f7d0638d169
RDX: 0000000000000001 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007f7d0640e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7d065a5fa0 R15: 00007fffd3edb648
 </TASK>
---[ end trace ]---