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:00007f78d0a5c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f78cfe25fa0 RCX: 00007f78cfb9e159
RDX: 0000000000000777 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f78d0a5c090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f78cfe26038 R14: 00007f78cfe25fa0 R15: 00007ffc1d469548
 </TASK>
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: 490 Comm: syz.3.56 Not tainted syzkaller #0 018ff8b15f97deb4d6c6217ad3b2c61971603935
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:cgroup_mkdir+0x122a/0x1600 kernel/cgroup/cgroup.c:5931
Code: eb 05 e8 79 4d 08 00 48 89 df e8 11 9e 00 00 48 81 fb 01 f0 ff ff 0f 83 9a fb ff ff 4c 8d b3 08 01 00 00 4d 89 f4 49 c1 ec 03 <43> 80 3c 2c 00 74 08 4c 89 f7 e8 b7 27 61 00 48 8b bb 08 01 00 00
RSP: 0018:ffffc9000d887c88 EFLAGS: 00010206
RAX: e56d21bb7819b500 RBX: 0000000000000000 RCX: ffff8881f6e3acc0
RDX: ffff8881134a5980 RSI: ffff88811ab8f000 RDI: ffff888100042000
RBP: ffffc9000d887d38 R08: ffffffff81dc02b8 R09: ffffffff81e01f9f
R10: ffffffff81e04a84 R11: ffffffff81e01abe R12: 0000000000000021
R13: dffffc0000000000 R14: 0000000000000108 R15: ffff88811ab8f010
FS:  00007f78d0a5c6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78cfa70050 CR3: 0000000119b4c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 kernfs_iop_mkdir+0x1bb/0x2d0 fs/kernfs/dir.c:1250
 vfs_mkdir+0x591/0x810 fs/namei.c:4265
 do_mkdirat+0x240/0x530 fs/namei.c:4288
 __do_sys_mkdirat fs/namei.c:4303 [inline]
 __se_sys_mkdirat fs/namei.c:4301 [inline]
 __x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4301
 x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259
 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: 0033:0x7f78cfb9e159
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:00007f78d0a5c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f78cfe25fa0 RCX: 00007f78cfb9e159
RDX: 0000000000000777 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f78d0a5c090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f78cfe26038 R14: 00007f78cfe25fa0 R15: 00007ffc1d469548
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:cgroup_mkdir+0x122a/0x1600 kernel/cgroup/cgroup.c:5931
Code: eb 05 e8 79 4d 08 00 48 89 df e8 11 9e 00 00 48 81 fb 01 f0 ff ff 0f 83 9a fb ff ff 4c 8d b3 08 01 00 00 4d 89 f4 49 c1 ec 03 <43> 80 3c 2c 00 74 08 4c 89 f7 e8 b7 27 61 00 48 8b bb 08 01 00 00
RSP: 0018:ffffc9000d887c88 EFLAGS: 00010206
RAX: e56d21bb7819b500 RBX: 0000000000000000 RCX: ffff8881f6e3acc0
RDX: ffff8881134a5980 RSI: ffff88811ab8f000 RDI: ffff888100042000
RBP: ffffc9000d887d38 R08: ffffffff81dc02b8 R09: ffffffff81e01f9f
R10: ffffffff81e04a84 R11: ffffffff81e01abe R12: 0000000000000021
R13: dffffc0000000000 R14: 0000000000000108 R15: ffff88811ab8f010
FS:  00007f78d0a5c6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78cfa70050 CR3: 0000000119b4c000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	ff c3                	inc    %ebx
   2:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   9:	00 00 00
   c:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  11:	48 89 f8             	mov    %rdi,%rax
  14:	48 89 f7             	mov    %rsi,%rdi
  17:	48 89 d6             	mov    %rdx,%rsi
  1a:	48 89 ca             	mov    %rcx,%rdx
  1d:	4d 89 c2             	mov    %r8,%r10
  20:	4d 89 c8             	mov    %r9,%r8
  23:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  28:	0f 05                	syscall
* 2a:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax <-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 c7 c1 e8 ff ff ff 	mov    $0xffffffffffffffe8,%rcx
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W