RDX: 00000000000001ff RSI: 0000200000000d00 RDI: ffffffffffffff9c RBP: 00007f6a15436b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6a15626038 R14: 00007f6a15625fa0 R15: 00007ffe75d7cb88 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: 1061 Comm: syz.3.318 Not tainted syzkaller #0 89738cdce93e33c1079eaf7360b55d01ca9e3330 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:cgroup_mkdir+0x122a/0x1600 kernel/cgroup/cgroup.c:5932 Code: eb 05 e8 89 50 08 00 48 89 df e8 f1 9d 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 a7 dd 61 00 48 8b bb 08 01 00 00 RSP: 0018:ffffc9000c9afc88 EFLAGS: 00010206 RAX: 1ca1193dab9e0300 RBX: 0000000000000000 RCX: ffff8881f6d3adc0 RDX: ffff88810c38d780 RSI: ffff888112fe6000 RDI: ffff888100042000 RBP: ffffc9000c9afd38 R08: ffffffff81f1792b R09: ffffffff8109c5a8 R10: ffffffff85a8ca67 R11: ffffffff85c0012f R12: 0000000000000021 R13: dffffc0000000000 R14: 0000000000000108 R15: ffff888112fe6010 FS: 00007f6a1633b6c0(0000) GS:ffff8881f6d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f720ff8 CR3: 0000000120fd0000 CR4: 00000000003526b0 Call Trace: kernfs_iop_mkdir+0x1bb/0x2d0 fs/kernfs/dir.c:1252 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: 0033:0x7f6a1539f559 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:00007f6a1633b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f6a15625fa0 RCX: 00007f6a1539f559 RDX: 00000000000001ff RSI: 0000200000000d00 RDI: ffffffffffffff9c RBP: 00007f6a15436b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6a15626038 R14: 00007f6a15625fa0 R15: 00007ffe75d7cb88 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:cgroup_mkdir+0x122a/0x1600 kernel/cgroup/cgroup.c:5932 Code: eb 05 e8 89 50 08 00 48 89 df e8 f1 9d 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 a7 dd 61 00 48 8b bb 08 01 00 00 RSP: 0018:ffffc9000c9afc88 EFLAGS: 00010206 RAX: 1ca1193dab9e0300 RBX: 0000000000000000 RCX: ffff8881f6d3adc0 RDX: ffff88810c38d780 RSI: ffff888112fe6000 RDI: ffff888100042000 RBP: ffffc9000c9afd38 R08: ffffffff81f1792b R09: ffffffff8109c5a8 R10: ffffffff85a8ca67 R11: ffffffff85c0012f R12: 0000000000000021 R13: dffffc0000000000 R14: 0000000000000108 R15: ffff888112fe6010 FS: 00007f6a1633b6c0(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a153ecc40 CR3: 0000000120fd0000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: eb 05 jmp 0x7 2: e8 89 50 08 00 call 0x85090 7: 48 89 df mov %rbx,%rdi a: e8 f1 9d 00 00 call 0x9e00 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 a7 dd 61 00 call 0x61dde0 39: 48 8b bb 08 01 00 00 mov 0x108(%rbx),%rdi