RAX: ffffffffffffffda RBX: 00007f2043815fa0 RCX: 00007f204359c629 RDX: 00002000000001c0 RSI: 0000200000000200 RDI: 0000200000000000 RBP: 00007f2044503090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000001814400 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f2043816038 R14: 00007f2043815fa0 R15: 00007ffddf5d6508 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 0 UID: 0 PID: 1167 Comm: syz.2.315 Not tainted syzkaller #0 e92730fa182d0321ab783e890b83e46c5a8dda99 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:cgroup_mkdir+0x117f/0x1570 kernel/cgroup/cgroup.c:5940 Code: eb 05 e8 f4 4c 08 00 4c 89 ef e8 0c 9e 00 00 49 81 fd 01 f0 ff ff 0f 83 b3 fb ff ff 4d 8d b5 08 01 00 00 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 02 26 60 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc900104e7960 EFLAGS: 00010206 RAX: 026c366498e03f00 RBX: 0000000000000021 RCX: ffff8881f6e3ae00 RDX: ffff88810cb97280 RSI: ffff88810dbec000 RDI: ffff888100042000 RBP: ffffc900104e7a08 R08: ffffffff81df3efe R09: ffffffff81df6f5a R10: ffffffff81df3efe R11: ffffffff81df6f5a R12: ffff8881087584e0 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00007f20445036c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010dfbe000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000c DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: kernfs_iop_mkdir+0x1c5/0x2d0 fs/kernfs/dir.c:1246 vfs_mkdir+0x582/0x820 fs/namei.c:4265 open_or_create_special_dir+0xed/0x1e0 fs/incfs/vfs.c:468 incfs_mount_fs+0x433/0x970 fs/incfs/vfs.c:1863 legacy_get_tree+0x103/0x1b0 fs/fs_context.c:662 vfs_get_tree+0x9e/0x290 fs/super.c:1820 do_new_mount+0x251/0xb30 fs/namespace.c:3557 path_mount+0x682/0x1010 fs/namespace.c:3884 do_mount fs/namespace.c:3897 [inline] __do_sys_mount fs/namespace.c:4107 [inline] __se_sys_mount+0x2bf/0x480 fs/namespace.c:4084 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4084 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f204359c629 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:00007f2044503028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2043815fa0 RCX: 00007f204359c629 RDX: 00002000000001c0 RSI: 0000200000000200 RDI: 0000200000000000 RBP: 00007f2044503090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000001814400 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f2043816038 R14: 00007f2043815fa0 R15: 00007ffddf5d6508 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:cgroup_mkdir+0x117f/0x1570 kernel/cgroup/cgroup.c:5940 Code: eb 05 e8 f4 4c 08 00 4c 89 ef e8 0c 9e 00 00 49 81 fd 01 f0 ff ff 0f 83 b3 fb ff ff 4d 8d b5 08 01 00 00 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 02 26 60 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc900104e7960 EFLAGS: 00010206 RAX: 026c366498e03f00 RBX: 0000000000000021 RCX: ffff8881f6e3ae00 RDX: ffff88810cb97280 RSI: ffff88810dbec000 RDI: ffff888100042000 RBP: ffffc900104e7a08 R08: ffffffff81df3efe R09: ffffffff81df6f5a R10: ffffffff81df3efe R11: ffffffff81df6f5a R12: ffff8881087584e0 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00007f20445036c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f20435e9d40 CR3: 000000010dfbe000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: eb 05 jmp 0x7 2: e8 f4 4c 08 00 call 0x84cfb 7: 4c 89 ef mov %r13,%rdi a: e8 0c 9e 00 00 call 0x9e1b f: 49 81 fd 01 f0 ff ff cmp $0xfffffffffffff001,%r13 16: 0f 83 b3 fb ff ff jae 0xfffffbcf 1c: 4d 8d b5 08 01 00 00 lea 0x108(%r13),%r14 23: 4c 89 f3 mov %r14,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 80 3c 3b 00 cmpb $0x0,(%rbx,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 02 26 60 00 call 0x60263b 39: 49 8b bd 08 01 00 00 mov 0x108(%r13),%rdi