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: 13160 Comm: syz-executor.0 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: ffff88807d1e4000 R13: 0000000000000c10 R14: ffffffff8d0cf10c R15: 0000000000000000 FS: 00005555566da400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f874353f000 CR3: 00000000337a4000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000006 DR3: 0000000000000000 DR6: 00000000ffff0ff0 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:wait_consider_task+0x99/0x3b80 kernel/exit.c:1288 Code: 28 00 00 00 48 89 84 24 f0 00 00 00 31 c0 e8 fe 6c 30 00 49 8d 8f f4 04 00 00 48 89 c8 48 89 4c 24 10 48 c1 e8 03 0f b6 14 28 <48> 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c2 1a 00 00 45 RSP: 0018:ffffc90002c47b60 EFLAGS: 00000a07 RAX: 1ffff1100d4c68a6 RBX: 0000000000000000 RCX: ffff88806a634534 RDX: 0000000000000000 RSI: ffffffff8144c562 RDI: ffffc90002c47d18 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8b60a083 R10: ffffffff81450736 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888039650200 R14: 0000000000000000 R15: ffff88806a634040 do_wait_thread kernel/exit.c:1397 [inline] do_wait+0x6ca/0xce0 kernel/exit.c:1514 kernel_wait4+0x14c/0x260 kernel/exit.c:1677 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1705 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: 0033:0x7f8d08c8dba7 Code: 89 7c 24 10 48 89 4c 24 18 e8 f5 51 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 52 02 00 8b 44 RSP: 002b:00007ffe85e8aca0 EFLAGS: 00000293 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 000000000000037e RCX: 00007f8d08c8dba7 RDX: 0000000040000001 RSI: 00007ffe85e8ad2c RDI: 00000000ffffffff RBP: 00007ffe85e8ad2c R08: 0000000000000000 R09: 00007ffe85fd2080 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 000000000012272e R14: 000000000000000e R15: 00007ffe85e8ad90 Modules linked in: ---[ end trace dea735cb285ec961 ]--- 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: ffff88807d1e4000 R13: 0000000000000c10 R14: ffffffff8d0cf10c R15: 0000000000000000 FS: 00005555566da400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f874353f000 CR3: 00000000337a4000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000006 DR3: 0000000000000000 DR6: 00000000ffff0ff0 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