================================================================================ UBSAN: shift-out-of-bounds in fs/ext4/super.c:2491:15 shift exponent 1668184435 is too large for 32-bit type 'int' CPU: 1 PID: 1951 Comm: syz.7.449 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 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+0x364/0x3f0 lib/ubsan.c:321 parse_options+0x23f3/0x2470 fs/ext4/super.c:2491 ext4_remount+0x618/0x2530 fs/ext4/super.c:5832 legacy_reconfigure+0xfa/0x110 fs/fs_context.c:634 reconfigure_super+0x225/0x8a0 fs/super.c:938 do_remount fs/namespace.c:2697 [inline] path_mount+0xc7b/0xff0 fs/namespace.c:3356 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3562 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562 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: 0033:0x7f31bfa9d0ca Code: 48 c7 c2 e8 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f31be4f5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f31be4f5ee0 RCX: 00007f31bfa9d0ca RDX: 0000200000000180 RSI: 0000200000000000 RDI: 0000000000000000 RBP: 0000200000000180 R08: 00007f31be4f5ee0 R09: 000000000094a4be R10: 000000000094a4be R11: 0000000000000246 R12: 0000200000000000 R13: 00007f31be4f5ea0 R14: 0000000000000000 R15: 00002000000003c0 ================================================================================ EXT4-fs (loop7): re-mounted. Opts: . Quota mode: none.