general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] CPU: 1 PID: 2976 Comm: systemd-udevd Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline] RIP: 0010:percpu_ref_put_many include/linux/percpu-refcount.h:319 [inline] RIP: 0010:percpu_ref_put include/linux/percpu-refcount.h:338 [inline] RIP: 0010:cgroup_bpf_put include/linux/cgroup.h:926 [inline] RIP: 0010:cgroup_sk_free+0x8d/0x570 kernel/cgroup/cgroup.c:6613 Code: 10 06 00 40 84 ed 5a 0f 84 42 01 00 00 e8 ab 08 06 00 4c 8d ab 10 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 6f 04 00 00 48 8b ab 10 0c 00 00 31 ff 49 89 ec RSP: 0018:ffffc90000fd8c38 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 0000000000000182 RSI: ffffffff816f29b5 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff816f29a6 R11: 0000000000000000 R12: ffff88807afc6000 R13: 0000000000000c10 R14: ffffffff8d0cf00c R15: 0000000000000000 FS: 00007f2a5ad958c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f76ee7d6218 CR3: 000000001aaae000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sk_prot_free net/core/sock.c:1852 [inline] __sk_destruct+0x579/0x900 net/core/sock.c:1943 sk_destruct+0xbd/0xe0 net/core/sock.c:1958 __sk_free+0xef/0x3d0 net/core/sock.c:1969 sk_free+0x78/0xa0 net/core/sock.c:1980 sock_put include/net/sock.h:1816 [inline] nr_heartbeat_expiry+0x2e7/0x460 net/netrom/nr_timer.c:148 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:kmem_cache_free+0x98/0x200 mm/slab.c:3743 Code: 75 0e 4c 89 ea 4c 89 e6 48 89 df e8 72 c0 ff ff 48 85 ed 75 5f 9c 58 f6 c4 02 0f 85 2a 01 00 00 48 85 ed 74 01 fb 48 8b 4b 58 <48> 8b 74 24 20 66 90 65 8b 05 b2 d4 45 7e 83 f8 07 0f 87 13 01 00 RSP: 0018:ffffc90002b67ca8 EFLAGS: 00000206 RAX: 0000000000000006 RBX: ffff8880114b9600 RCX: ffffffff89996fc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817b5ca8 R11: 0000000000086089 R12: ffff8880790e0b40 R13: ffffffff81cb6b4e R14: ffffc90002b67d80 R15: 0000000000000000 putname fs/namei.c:270 [inline] putname+0xfe/0x140 fs/namei.c:256 user_path_at_empty+0x4d/0x60 fs/namei.c:2803 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x142/0x390 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] vfs_stat include/linux/fs.h:3352 [inline] __do_sys_newstat+0x91/0x110 fs/stat.c:385 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2a59c07295 Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 0f 1f 84 00 00 00 00 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 d1 db 2b 00 f7 d8 64 89 RSP: 002b:00007fffc64c8408 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000555d97e90968 RCX: 00007f2a59c07295 RDX: 00007fffc64c8420 RSI: 00007fffc64c8420 RDI: 0000555d97e704ce RBP: 0000555d98183a28 R08: 0000555d981c3280 R09: 0000000000000018 R10: 00058e3555e47640 R11: 0000000000000246 R12: 00007fffc64c8420 R13: 0000000000000000 R14: 00007fffc64c8478 R15: 0000000000000000 Modules linked in: ---[ end trace f1f904acee56d78b ]--- RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline] RIP: 0010:percpu_ref_put_many include/linux/percpu-refcount.h:319 [inline] RIP: 0010:percpu_ref_put include/linux/percpu-refcount.h:338 [inline] RIP: 0010:cgroup_bpf_put include/linux/cgroup.h:926 [inline] RIP: 0010:cgroup_sk_free+0x8d/0x570 kernel/cgroup/cgroup.c:6613 Code: 10 06 00 40 84 ed 5a 0f 84 42 01 00 00 e8 ab 08 06 00 4c 8d ab 10 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 6f 04 00 00 48 8b ab 10 0c 00 00 31 ff 49 89 ec RSP: 0018:ffffc90000fd8c38 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 0000000000000182 RSI: ffffffff816f29b5 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff816f29a6 R11: 0000000000000000 R12: ffff88807afc6000 R13: 0000000000000c10 R14: ffffffff8d0cf00c R15: 0000000000000000 FS: 00007f2a5ad958c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f76ee7d6218 CR3: 000000001aaae000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 10 06 adc %al,(%rsi) 2: 00 40 84 add %al,-0x7c(%rax) 5: ed in (%dx),%eax 6: 5a pop %rdx 7: 0f 84 42 01 00 00 je 0x14f d: e8 ab 08 06 00 callq 0x608bd 12: 4c 8d ab 10 0c 00 00 lea 0xc10(%rbx),%r13 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 4c 89 ea mov %r13,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 6f 04 00 00 jne 0x4a3 34: 48 8b ab 10 0c 00 00 mov 0xc10(%rbx),%rbp 3b: 31 ff xor %edi,%edi 3d: 49 89 ec mov %rbp,%r12