R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ff94c616038 R14: 00007ff94c615fa0 R15: 00007ffda1496f48 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: 3217 Comm: syz.2.1323 Not tainted syzkaller #0 90b12aa1a603b2eff3e7fbc29ad65555fd578c6a 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 f2 83 60 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc9000f1f7c88 EFLAGS: 00010206 RAX: 0d2c65eebb260a00 RBX: 0000000000000021 RCX: ffff8881f6f3ae40 RDX: ffff88810aae7e00 RSI: ffff8881006f7000 RDI: ffff888100042000 RBP: ffffc9000f1f7d30 R08: 0000000066a649ed R09: 000000009b2e8004 R10: 000000000000000c R11: ffffffff8175d830 R12: ffff88812174da90 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00007ff94d29c6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff94c44edd5 CR3: 0000000105650000 CR4: 00000000003526b0 Call Trace: kernfs_iop_mkdir+0x1c5/0x2d0 fs/kernfs/dir.c:1246 vfs_mkdir+0x585/0x820 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: 0033:0x7ff94c39c819 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:00007ff94d29c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007ff94c615fa0 RCX: 00007ff94c39c819 RDX: 00000000000001ff RSI: 00002000000001c0 RDI: 0000000000000003 RBP: 00007ff94d29c090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ff94c616038 R14: 00007ff94c615fa0 R15: 00007ffda1496f48 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 f2 83 60 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc9000f1f7c88 EFLAGS: 00010206 RAX: 0d2c65eebb260a00 RBX: 0000000000000021 RCX: ffff8881f6f3ae40 RDX: ffff88810aae7e00 RSI: ffff8881006f7000 RDI: ffff888100042000 RBP: ffffc9000f1f7d30 R08: 0000000066a649ed R09: 000000009b2e8004 R10: 000000000000000c R11: ffffffff8175d830 R12: ffff88812174da90 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00007ff94d29c6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555590743908 CR3: 0000000105650000 CR4: 00000000003526b0 ---------------- 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 f2 83 60 00 call 0x60842b 39: 49 8b bd 08 01 00 00 mov 0x108(%r13),%rdi