RBP: 00007f42d703506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42d7226038 R14: 00007f42d7225fa0 R15: 00007ffe0f640ba8
 </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: 1 UID: 0 PID: 5448 Comm: syz.3.1522 Not tainted syzkaller #0 93cd2a7db6251899ee82c41fb24ebb4b8e8a6534
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 f7 2a 61 00 48 8b bb 08 01 00 00
RSP: 0018:ffffc900058e7c88 EFLAGS: 00010206
RAX: 8831dec28df53a00 RBX: 0000000000000000 RCX: ffff8881f6f3acc0
RDX: ffff88810aff8780 RSI: ffff88811c331000 RDI: ffff888100042000
RBP: ffffc900058e7d38 R08: ffffffff81eeebab R09: ffffffff8109c5e8
R10: ffffffff85a52a67 R11: ffffffff85c0012f R12: 0000000000000021
R13: dffffc0000000000 R14: 0000000000000108 R15: ffff88811c331010
FS:  00007f42d7e716c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f42d6e70050 CR3: 00000001446fa000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 08c5d32ffc85c5bc
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kernfs_iop_mkdir+0x1be/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: 0033:0x7f42d6f9e159
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:00007f42d7e71028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f42d7225fa0 RCX: 00007f42d6f9e159
RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f42d703506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42d7226038 R14: 00007f42d7225fa0 R15: 00007ffe0f640ba8
 </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 f7 2a 61 00 48 8b bb 08 01 00 00
RSP: 0018:ffffc900058e7c88 EFLAGS: 00010206
RAX: 8831dec28df53a00 RBX: 0000000000000000 RCX: ffff8881f6f3acc0
RDX: ffff88810aff8780 RSI: ffff88811c331000 RDI: ffff888100042000
RBP: ffffc900058e7d38 R08: ffffffff81eeebab R09: ffffffff8109c5e8
R10: ffffffff85a52a67 R11: ffffffff85c0012f R12: 0000000000000021
R13: dffffc0000000000 R14: 0000000000000108 R15: ffff88811c331010
FS:  00007f42d7e716c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000080 CR3: 00000001446fa000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 08c5d32ffc85c5bc
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	eb 05                	jmp    0x7
   2:	e8 79 4d 08 00       	call   0x84d80
   7:	48 89 df             	mov    %rbx,%rdi
   a:	e8 11 9e 00 00       	call   0x9e20
   f:	48 81 fb 01 f0 ff ff 	cmp    $0xfffffffffffff001,%rbx
  16:	0f 83 9a fb ff ff    	jae    0xfffffbb6
  1c:	4c 8d b3 08 01 00 00 	lea    0x108(%rbx),%r14
  23:	4d 89 f4             	mov    %r14,%r12
  26:	49 c1 ec 03          	shr    $0x3,%r12
* 2a:	43 80 3c 2c 00       	cmpb   $0x0,(%r12,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 f7 2a 61 00       	call   0x612b30
  39:	48 8b bb 08 01 00 00 	mov    0x108(%rbx),%rdi