syzbot

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UBSAN: shift-out-of-bounds in fs/9p/vfs_super.c:57:22
shift exponent 32 is too large for 32-bit type 'int'
CPU: 0 UID: 0 PID: 5861 Comm: syz-executor379 Not tainted 6.17.0-rc2-next-20250818-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494
 v9fs_fill_super fs/9p/vfs_super.c:57 [inline]
 v9fs_get_tree+0x957/0xa90 fs/9p/vfs_super.c:125
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1752
 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810
 do_mount fs/namespace.c:4138 [inline]
 __do_sys_mount fs/namespace.c:4349 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4326
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff35edd46a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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:00007ffeee8a4078 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00002000000025c0 RCX: 00007ff35edd46a9
RDX: 00002000000000c0 RSI: 00002000000025c0 RDI: 0000000000000000
RBP: 0000200000000280 R08: 0000200000000280 R09: 00007ffeee8a4258
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff35ee1d017
R13: 00007ffeee8a4248 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
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