loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:314:16
shift exponent -1 is negative
CPU: 1 PID: 5038 Comm: syz-executor155 Not tainted 6.5.0-rc6-next-20230818-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_shift_out_of_bounds+0x27a/0x600 lib/ubsan.c:387
 extBalloc fs/jfs/jfs_extent.c:314 [inline]
 extAlloc.cold+0x8b/0xc5 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x428/0xb20 fs/jfs/inode.c:248
 __block_write_begin_int+0x3c0/0x1470 fs/buffer.c:2107
 __block_write_begin fs/buffer.c:2157 [inline]
 block_write_begin+0xb1/0x490 fs/buffer.c:2216
 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299
 generic_perform_write+0x278/0x600 mm/filemap.c:3945
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4040
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4066
 call_write_iter include/linux/fs.h:1983 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x650/0xe40 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fef25479a39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe6e76ca58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffe6e76cc28 RCX: 00007fef25479a39
RDX: 000000000208e24b RSI: 00000000200001c0 RDI: 0000000000000004
RBP: 00007fef254f2610 R08: 0000000000000000 R09: 00007ffe6e76cc28
R10: 0000000000005de8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe6e76cc18 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
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