RSP: 002b:00007f331b42d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f331a815fa0 RCX: 00007f331a59ce59 RDX: 0000200000000100 RSI: 0000200000000000 RDI: 0000200000000080 RBP: 00007f331b42d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000a18082 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f331a816038 R14: 00007f331a815fa0 R15: 00007fff17999ee8 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: 1354 Comm: syz.2.382 Not tainted syzkaller #0 111b2e0850fa4a367413a3971448b32f560820b7 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:ffffc9000ea4f988 EFLAGS: 00010206 RAX: bb0480b7bb8f2500 RBX: 0000000000000000 RCX: ffff8881f6e3acc0 RDX: ffff888136d6ef00 RSI: ffff888107731000 RDI: ffff888100042000 RBP: ffffc9000ea4fa38 R08: 00000000a823fa33 R09: 0000000062056b5f R10: 0000000000000012 R11: ffffffff81759b00 R12: 0000000000000021 R13: dffffc0000000000 R14: 0000000000000108 R15: ffff888107731010 FS: 00007f331b42d6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f331a817dac CR3: 0000000137ab2000 CR4: 00000000003526b0 Call Trace: kernfs_iop_mkdir+0x1bb/0x2d0 fs/kernfs/dir.c:1250 vfs_mkdir+0x58e/0x810 fs/namei.c:4265 open_or_create_special_dir+0xf1/0x200 fs/incfs/vfs.c:468 incfs_mount_fs+0x433/0x970 fs/incfs/vfs.c:1863 legacy_get_tree+0x103/0x1b0 fs/fs_context.c:662 vfs_get_tree+0x9e/0x290 fs/super.c:1820 do_new_mount+0x251/0xb40 fs/namespace.c:3567 path_mount+0x66a/0xff0 fs/namespace.c:3894 do_mount fs/namespace.c:3907 [inline] __do_sys_mount fs/namespace.c:4117 [inline] __se_sys_mount+0x2bf/0x480 fs/namespace.c:4094 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4094 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166 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: 0033:0x7f331a59ce59 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:00007f331b42d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f331a815fa0 RCX: 00007f331a59ce59 RDX: 0000200000000100 RSI: 0000200000000000 RDI: 0000200000000080 RBP: 00007f331b42d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000a18082 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f331a816038 R14: 00007f331a815fa0 R15: 00007fff17999ee8 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:ffffc9000ea4f988 EFLAGS: 00010206 RAX: bb0480b7bb8f2500 RBX: 0000000000000000 RCX: ffff8881f6e3acc0 RDX: ffff888136d6ef00 RSI: ffff888107731000 RDI: ffff888100042000 RBP: ffffc9000ea4fa38 R08: 00000000a823fa33 R09: 0000000062056b5f R10: 0000000000000012 R11: ffffffff81759b00 R12: 0000000000000021 R13: dffffc0000000000 R14: 0000000000000108 R15: ffff888107731010 FS: 00007f331b42d6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f331a817dac CR3: 0000000137ab2000 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