RBP: 00007f4af84db090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f4af7826038 R14: 00007f4af7825fa0 R15: 00007ffcb1d6f618 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: 60928 PID: 1837 Comm: syz.3.539 Not tainted syzkaller #0 3aaf08658a080e6b88ffed1aa00ccc3c40537342 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:cgroup_mkdir+0x122a/0x1600 kernel/cgroup/cgroup.c:5941 Code: eb 05 e8 69 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 97 00 61 00 48 8b bb 08 01 00 00 RSP: 0018:ffffc9001073fc88 EFLAGS: 00010206 RAX: 7544c2ebff191100 RBX: 0000000000000000 RCX: ffff8881f6e3acc0 RDX: ffff88812710c080 RSI: ffff88811b0e6000 RDI: ffff888100042000 RBP: ffffc9001073fd38 R08: 000000008406bd92 R09: 00000000ef3be0ad R10: 000000000000000c R11: ffffffff81759b00 R12: 0000000000000021 R13: dffffc0000000000 R14: 0000000000000108 R15: ffff88811b0e6010 FS: 00007f4af84db6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 0000000119552000 CR4: 00000000003526b0 Call Trace: kernfs_iop_mkdir+0x1bb/0x2d0 fs/kernfs/dir.c:1250 vfs_mkdir+0x58e/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: 0033:0x7f4af759de59 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:00007f4af84db028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f4af7825fa0 RCX: 00007f4af759de59 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f4af84db090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f4af7826038 R14: 00007f4af7825fa0 R15: 00007ffcb1d6f618 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:cgroup_mkdir+0x122a/0x1600 kernel/cgroup/cgroup.c:5941 Code: eb 05 e8 69 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 97 00 61 00 48 8b bb 08 01 00 00 RSP: 0018:ffffc9001073fc88 EFLAGS: 00010206 RAX: 7544c2ebff191100 RBX: 0000000000000000 RCX: ffff8881f6e3acc0 RDX: ffff88812710c080 RSI: ffff88811b0e6000 RDI: ffff888100042000 RBP: ffffc9001073fd38 R08: 000000008406bd92 R09: 00000000ef3be0ad R10: 000000000000000c R11: ffffffff81759b00 R12: 0000000000000021 R13: dffffc0000000000 R14: 0000000000000108 R15: ffff88811b0e6010 FS: 00007f4af84db6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c353c8d CR3: 0000000119552000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: eb 05 jmp 0x7 2: e8 69 4d 08 00 call 0x84d70 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 97 00 61 00 call 0x6100d0 39: 48 8b bb 08 01 00 00 mov 0x108(%rbx),%rdi