================================================================================
UBSAN: shift-out-of-bounds in fs/ext4/super.c:4345:27
shift exponent 59 is too large for 32-bit type 'int'
CPU: 1 PID: 464 Comm: syz-executor.0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 dump_stack+0x15/0x24 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
 ext4_handle_clustersize+0x4b3/0x5c0 fs/ext4/super.c:4345
 __ext4_fill_super fs/ext4/super.c:5227 [inline]
 ext4_fill_super+0x3c8b/0x7590 fs/ext4/super.c:5674
 get_tree_bdev+0x447/0x690 fs/super.c:1371
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5704
 vfs_get_tree+0x9a/0x270 fs/super.c:1578
 do_new_mount+0x251/0xb30 fs/namespace.c:3081
 path_mount+0x659/0xfc0 fs/namespace.c:3411
 do_mount fs/namespace.c:3424 [inline]
 __do_sys_mount fs/namespace.c:3632 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3609
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3609
 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe200a6d94a
Code: 48 c7 c2 d0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe20171bed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe20171bf70 RCX: 00007fe200a6d94a
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fe20171bf30
RBP: 0000000020000040 R08: 00007fe20171bf70 R09: 0000000000004500
R10: 0000000000004500 R11: 0000000000000246 R12: 0000000020000080
R13: 00007fe20171bf30 R14: 00000000000004dc R15: 00000000200000c0
 </TASK>
================================================================================
EXT4-fs (loop0): fragment/cluster size (0) != block size (4096)