================================================================================ UBSAN: shift-out-of-bounds in fs/ext4/super.c:2756:15 shift exponent 1985801048 is too large for 32-bit type 'int' CPU: 0 PID: 6278 Comm: syz.6.1792 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __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+0x364/0x3f0 lib/ubsan.c:321 ext4_check_opt_consistency+0x1353/0x16e0 fs/ext4/super.c:2756 ext4_reconfigure+0xc7/0x27b0 fs/ext4/super.c:6681 reconfigure_super+0x233/0x8b0 fs/super.c:982 do_remount fs/namespace.c:2742 [inline] path_mount+0xce4/0xfd0 fs/namespace.c:3403 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: 0033:0x7ff09a19ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff09afed028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff09a415fa0 RCX: 00007ff09a19ce59 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000 RBP: 00007ff09a232d6f R08: 0000200000000000 R09: 0000000000000000 R10: 0000000002390024 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff09a416038 R14: 00007ff09a415fa0 R15: 00007fff265b66f8 ================================================================================ EXT4-fs: Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE EXT4-fs: Can't set or change test_dummy_encryption on remount