RAX: ffffffffffffffda RBX: 00007fb731de5fa0 RCX: 00007fb731b8f6c9 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007ffc09231c70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fb731de5fa0 R14: 00007fb731de5fa0 R15: 0000000000000003 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: 385 Comm: syz.2.17 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:cgroup_mkdir+0x1180/0x1580 kernel/cgroup/cgroup.c:5917 Code: eb 05 e8 73 44 08 00 4c 89 ef e8 0b 9c 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 c1 b1 5e 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc90003bbfce8 EFLAGS: 00010206 RAX: cfcd2338c1e69f00 RBX: 0000000000000021 RCX: ffff8881f6e3ae00 RDX: ffff88812a3c5c80 RSI: ffff88811587c000 RDI: ffff888100042000 RBP: ffffc90003bbfd90 R08: ffffffff81eab59b R09: ffffffff8109c4b8 R10: ffffffff858d3538 R11: ffffffff85a0012f R12: ffff888112c53270 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00005555662b2500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb731de7dac CR3: 000000012706e000 CR4: 00000000003526b0 Call Trace: kernfs_iop_mkdir+0x1c2/0x2d0 fs/kernfs/dir.c:1246 vfs_mkdir+0x583/0x820 fs/namei.c:4257 do_mkdirat+0x1bf/0x420 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4293 x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fb731b8f6c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc09231c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fb731de5fa0 RCX: 00007fb731b8f6c9 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007ffc09231c70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fb731de5fa0 R14: 00007fb731de5fa0 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:cgroup_mkdir+0x1180/0x1580 kernel/cgroup/cgroup.c:5917 Code: eb 05 e8 73 44 08 00 4c 89 ef e8 0b 9c 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 c1 b1 5e 00 49 8b bd 08 01 00 00 RSP: 0018:ffffc90003bbfce8 EFLAGS: 00010206 RAX: cfcd2338c1e69f00 RBX: 0000000000000021 RCX: ffff8881f6e3ae00 RDX: ffff88812a3c5c80 RSI: ffff88811587c000 RDI: ffff888100042000 RBP: ffffc90003bbfd90 R08: ffffffff81eab59b R09: ffffffff8109c4b8 R10: ffffffff858d3538 R11: ffffffff85a0012f R12: ffff888112c53270 R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000 FS: 00005555662b2500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34124008 CR3: 000000012706e000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: eb 05 jmp 0x7 2: e8 73 44 08 00 call 0x8447a 7: 4c 89 ef mov %r13,%rdi a: e8 0b 9c 00 00 call 0x9c1a 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 c1 b1 5e 00 call 0x5eb1fa 39: 49 8b bd 08 01 00 00 mov 0x108(%r13),%rdi