Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 1856 Comm: syz.2.520 Not tainted syzkaller #0 40a6597ee361193aa500bbffa95ee137cbfef8e8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:current_umask+0x4e/0x80 fs/fs_struct.c:158 Code: 81 c3 78 08 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 60 ca e5 ff 48 8b 1b 48 83 c3 0c 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 0c 8b 03 5b 41 5e 5d e9 8e cc 97 03 cc 89 RSP: 0018:ffffc9000de2f5e0 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000c RCX: ffff88810b385f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000de2f5f0 R08: 000000003e0539ff R09: 00000001effbffac R10: effbffac00000000 R11: 0000000000000001 R12: ffff888123cdd040 R13: ffff888123cdd068 R14: dffffc0000000000 R15: ffff88811308b880 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83ecc02bd0 CR3: 00000000072a8000 CR4: 00000000003526b0 Call Trace: mode_strip_umask include/linux/namei.h:111 [inline] vfs_prepare_mode fs/namei.c:3250 [inline] vfs_mknod+0x486/0x6d0 fs/namei.c:4126 vfs_whiteout include/linux/fs.h:1970 [inline] ovl_do_whiteout fs/overlayfs/overlayfs.h:382 [inline] ovl_whiteout fs/overlayfs/dir.c:78 [inline] ovl_cleanup_and_whiteout+0x230/0x6a0 fs/overlayfs/dir.c:118 ovl_remove_and_whiteout fs/overlayfs/dir.c:791 [inline] ovl_do_remove+0x886/0xcf0 fs/overlayfs/dir.c:914 ovl_rmdir+0x1e/0x30 fs/overlayfs/dir.c:945 vfs_rmdir+0x3dd/0x560 fs/namei.c:4340 incfs_kill_sb+0x109/0x230 fs/incfs/vfs.c:1968 deactivate_locked_super+0xd5/0x2a0 fs/super.c:476 deactivate_super+0xb8/0xe0 fs/super.c:509 cleanup_mnt+0x3f1/0x480 fs/namespace.c:1370 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1377 task_work_run+0x1e3/0x250 kernel/task_work.c:240 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0x9bc/0x2630 kernel/exit.c:953 do_group_exit+0x22a/0x300 kernel/exit.c:1095 get_signal+0x139d/0x14f0 kernel/signal.c:2933 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0053:0x68daea46cc5edccd Code: Unable to access opcode bytes at 0x68daea46cc5edca3. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 3b493b81f3229b3a RAX: 000000004d98db3a RBX: 00000000323b3a02 RCX: 00000000060d53a8 RDX: 00000000134f4448 RSI: 000000006b179c8d RDI: 000000001df9f004 RBP: 0000000051feb9e6 R08: 9e00aa80badf9ca3 R09: 262a8f46fc1abed3 R10: d108cbe03db740d8 R11: f0a971f7bb0d4045 R12: 6c14749917ebe22e R13: f371a5dada18777f R14: d6f16f60921a6484 R15: 83b20c40cccad612 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:current_umask+0x4e/0x80 fs/fs_struct.c:158 Code: 81 c3 78 08 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 60 ca e5 ff 48 8b 1b 48 83 c3 0c 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 0c 8b 03 5b 41 5e 5d e9 8e cc 97 03 cc 89 RSP: 0018:ffffc9000de2f5e0 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000c RCX: ffff88810b385f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000de2f5f0 R08: 000000003e0539ff R09: 00000001effbffac R10: effbffac00000000 R11: 0000000000000001 R12: ffff888123cdd040 R13: ffff888123cdd068 R14: dffffc0000000000 R15: ffff88811308b880 FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd91045ff8 CR3: 00000000072a8000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: 81 c3 78 08 00 00 add $0x878,%ebx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 60 ca e5 ff call 0xffe5ca7c 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 0c add $0xc,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 75 0c jne 0x3f 33: 8b 03 mov (%rbx),%eax 35: 5b pop %rbx 36: 41 5e pop %r14 38: 5d pop %rbp 39: e9 8e cc 97 03 jmp 0x397cccc 3e: cc int3 3f: 89 .byte 0x89