RSP: 002b:00007f7c89a37028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f7c88e15fa0 RCX: 00007f7c88b9c799 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f7c89a37090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f7c88e16038 R14: 00007f7c88e15fa0 R15: 00007ffd40d7b7f8 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: 741 Comm: syz.1.126 Not tainted syzkaller #0 4cdc09a83674403ae09eb79c4caea2b8730b48e4 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 34 4e 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 d2 7a 60 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc9000dcffc88 EFLAGS: 00010206 RAX: f395b16a2b00c100 RBX: 0000000000000021 RCX: ffff8881f6f3ae40 RDX: ffff888103307c80 RSI: ffff888100a88000 RDI: ffff888100042000 RBP: ffffc9000dcffd30 R08: 0000000010c203e9 R09: 000000001bb97d28 R10: 000000000000000c R11: ffffffff8175d5f0 R12: ffff888108b7b000 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00007f7c89a376c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ea63fff CR3: 000000012104a000 CR4: 00000000003526b0 Call Trace: kernfs_iop_mkdir+0x1c2/0x2d0 fs/kernfs/dir.c:1246 vfs_mkdir+0x582/0x820 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: 0033:0x7f7c88b9c799 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:00007f7c89a37028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f7c88e15fa0 RCX: 00007f7c88b9c799 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f7c89a37090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f7c88e16038 R14: 00007f7c88e15fa0 R15: 00007ffd40d7b7f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:cgroup_mkdir+0x117f/0x1570 kernel/cgroup/cgroup.c:5940 Code: eb 05 e8 34 4e 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 d2 7a 60 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc9000dcffc88 EFLAGS: 00010206 RAX: f395b16a2b00c100 RBX: 0000000000000021 RCX: ffff8881f6f3ae40 RDX: ffff888103307c80 RSI: ffff888100a88000 RDI: ffff888100042000 RBP: ffffc9000dcffd30 R08: 0000000010c203e9 R09: 000000001bb97d28 R10: 000000000000000c R11: ffffffff8175d5f0 R12: ffff888108b7b000 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00007f7c89a376c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc3dc21378 CR3: 000000012104a000 CR4: 00000000003526b0 DR0: 0000000000009120 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: eb 05 jmp 0x7 2: e8 34 4e 08 00 call 0x84e3b 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 d2 7a 60 00 call 0x607b0b 39: 49 8b bd 08 01 00 00 mov 0x108(%r13),%rdi