loop0: detected capacity change from 0 to 256
exFAT-fs (loop0): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
exFAT-fs (loop0): Medium has reported failures. Some data may be lost.
================================================================================
UBSAN: shift-out-of-bounds in fs/exfat/super.c:520:38
shift exponent 121 is too large for 32-bit type 'int'
CPU: 1 PID: 319 Comm: syz-executor925 Not tainted 5.15.184-syzkaller-00129-g4032a894ccb2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 dump_stack+0x15/0x20 lib/dump_stack.c:113
 ubsan_epilogue+0xe/0x40 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds+0x37c/0x400 lib/ubsan.c:321
 exfat_read_boot_sector fs/exfat/super.c:520 [inline]
 __exfat_fill_super fs/exfat/super.c:576 [inline]
 exfat_fill_super+0x2930/0x2d00 fs/exfat/super.c:644
 get_tree_bdev+0x433/0x670 fs/super.c:1325
 exfat_get_tree+0x1c/0x20 fs/exfat/super.c:716
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3014
 path_mount+0x675/0x1020 fs/namespace.c:3344
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3542
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3542
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbad0a4a97a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 8e 04 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:00007fbad0a04fd8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbad0a04ff0 RCX: 00007fbad0a4a97a
RDX: 00002000000005c0 RSI: 0000200000000240 RDI: 00007fbad0a04ff0
RBP: 0000200000000240 R08: 00007fbad0a05030 R09: 00000000000014f8
R10: 0000000003000050 R11: 0000000000000286 R12: 00002000000005c0
R13: 00007fbad0a05030 R14: 0000000000000004 R15: 0000000003000050
 </TASK>
================================================================================
exFAT-fs (loop0): unable to set blocksize 33554432
exFAT-fs (loop0): failed to read boot sector
exFAT-fs (loop0): failed to recognize exfat type