------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2867:24
index 83886080 is out of range for type 's8[1365]' (aka 'signed char[1365]')
CPU: 0 UID: 0 PID: 109 Comm: jfsCommit 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
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe8/0xf0 lib/ubsan.c:455
 dbJoin+0x29f/0x300 fs/jfs/jfs_dmap.c:2867
 dbFreeBits+0x4e1/0xdb0 fs/jfs/jfs_dmap.c:2427
 dbFreeDmap fs/jfs/jfs_dmap.c:2176 [inline]
 dbFree+0x336/0x650 fs/jfs/jfs_dmap.c:485
 txFreeMap+0x9e6/0xde0 fs/jfs/jfs_txnmgr.c:2517
 xtTruncate+0xd38/0x2f20 fs/jfs/jfs_xtree.c:2481
 jfs_free_zero_link+0x35b/0x4c0 fs/jfs/namei.c:760
 jfs_evict_inode+0x363/0x440 fs/jfs/inode.c:159
 evict+0x61e/0xb10 fs/inode.c:841
 txLazyCommit fs/jfs/jfs_txnmgr.c:2666 [inline]
 jfs_lazycommit+0x43d/0xaa0 fs/jfs/jfs_txnmgr.c:2735
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
---[ end trace ]---