------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2780:24
index 4278848010 is out of range for type 's8[1365]' (aka 'signed char[1365]')
CPU: 0 UID: 0 PID: 8651 Comm: syz.3.807 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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:2780
 dbFreeBits+0x4e1/0xdb0 fs/jfs/jfs_dmap.c:2340
 dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline]
 dbFree+0x336/0x650 fs/jfs/jfs_dmap.c:398
 txFreeMap+0x9e6/0xde0 fs/jfs/jfs_txnmgr.c:2516
 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
 __dentry_kill+0x1a2/0x5e0 fs/dcache.c:670
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1147
 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1174
 shrink_dcache_tree+0xcf/0x310 fs/dcache.c:-1
 do_one_tree fs/dcache.c:1654 [inline]
 shrink_dcache_for_umount+0xa8/0x1f0 fs/dcache.c:1671
 generic_shutdown_super+0x6f/0x2d0 fs/super.c:624
 kill_block_super+0x44/0x90 fs/super.c:1725
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x22c0 kernel/exit.c:977
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
 get_signal+0x1284/0x1330 kernel/signal.c:3039
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5111b5d04e
Code: Unable to access opcode bytes at 0x7f5111b5d024.
RSP: 002b:00007f51129acf58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f51129ad6c0 RCX: 00007f5111b5d04e
RDX: 00007f51129acfb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5111c32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5111e16038 R14: 00007f5111e15fa0 R15: 00007fffc3ae10c8
 </TASK>
---[ end trace ]---