loop0: detected capacity change from 0 to 32770
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/super-io.c:652:18
shift exponent 255 is too large for 32-bit type 'int'
CPU: 0 PID: 9006 Comm: syz-executor.0 Not tainted 6.9.0-rc6-syzkaller-00290-gb9158815de52 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:114
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2a5/0x480 lib/ubsan.c:468
 read_one_super.cold+0x1a/0x5e fs/bcachefs/super-io.c:652
 __bch2_read_super+0x4d6/0x12a0 fs/bcachefs/super-io.c:750
 bch2_fs_open+0x3e5/0x1110 fs/bcachefs/super.c:2049
 bch2_mount+0xdcc/0x1130 fs/bcachefs/fs.c:1903
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14e6/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f19dda7f3aa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f19de8a7ef8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f19de8a7f80 RCX: 00007f19dda7f3aa
RDX: 0000000020005d80 RSI: 0000000020005dc0 RDI: 00007f19de8a7f40
RBP: 0000000020005d80 R08: 00007f19de8a7f80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020005dc0
R13: 00007f19de8a7f40 R14: 0000000000005d5e R15: 0000000020005e40
 </TASK>
---[ end trace ]---