loop2: detected capacity change from 0 to 32768
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1671:12
shift exponent -256 is negative
CPU: 0 PID: 13436 Comm: syz-executor.2 Not tainted 6.1.0-rc1-syzkaller-00134-ge35184f32151 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3a6/0x420 lib/ubsan.c:322
 dbFindCtl+0x451/0x5f0 fs/jfs/jfs_dmap.c:1671
 dbAllocAny fs/jfs/jfs_dmap.c:1502 [inline]
 dbAlloc+0x31b/0xc90 fs/jfs/jfs_dmap.c:732
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x528/0x1030 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x410/0xe30 fs/jfs/inode.c:248
 __block_write_begin_int+0x57c/0x1ae0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x93/0x1e0 fs/buffer.c:2102
 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304
 generic_perform_write+0x314/0x610 mm/filemap.c:3753
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3881
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3913
 do_iter_write+0x6f0/0xc50 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x219/0x360 fs/read_write.c:1031
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fce1e48b5f9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fce1f63b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fce1e5abf80 RCX: 00007fce1e48b5f9
RDX: 0000000000000002 RSI: 0000000020003380 RDI: 0000000000000003
RBP: 00007fce1e4e67b0 R08: 0000000002000000 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff8861262f R14: 00007fce1f63b300 R15: 0000000000022000
 </TASK>
================================================================================