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: 8681 Comm: kworker/1:8 Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events iterate_cleanup_work 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+0x93/0x1d0 include/linux/percpu-refcount.h:338 Code: 01 48 c7 c7 40 58 52 8a be b1 02 00 00 48 c7 c2 80 58 52 8a e8 de 18 e9 ff 49 bd 00 00 00 00 00 fc ff df 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1e 75 52 00 48 8b 2b 48 89 ee 48 RSP: 0018:ffffc90000dc0b30 EFLAGS: 00010206 RAX: 0000000000000182 RBX: 0000000000000c10 RCX: ffff8880862d9c80 RDX: 0000000080000100 RSI: 0000000000000004 RDI: ffff8880b9d32508 RBP: 000000000000003b R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffff888088dde000 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002001d000 CR3: 0000000081040000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cgroup_bpf_put include/linux/cgroup.h:926 [inline] cgroup_sk_free+0x3c/0xa0 kernel/cgroup/cgroup.c:6613 sk_prot_free net/core/sock.c:1852 [inline] __sk_destruct+0x541/0x820 net/core/sock.c:1943 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x71a/0x910 kernel/time/timer.c:1734 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1747 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:103 [inline] RIP: 0010:__local_bh_enable_ip+0x16b/0x1f0 kernel/softirq.c:390 Code: 8a e8 39 ae a9 08 65 66 8b 05 91 ce b3 7e 66 85 c0 75 57 bf 01 00 00 00 e8 42 14 0a 00 e8 9d b5 39 00 fb 65 8b 05 fd b2 b2 7e <85> c0 75 05 e8 84 1a b1 ff 48 c7 44 24 20 0e 36 e0 45 49 c7 04 1c RSP: 0018:ffffc90017dc7a20 EFLAGS: 00000282 RAX: 0000000080000000 RBX: 1ffff92002fb8f48 RCX: ffffffff816483c1 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90017dc7ad0 R08: dffffc0000000000 R09: fffffbfff1fa31e6 R10: fffffbfff1fa31e6 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff92002fb8f4c R14: ffffc90017dc7a60 R15: 0000000000000200 get_next_corpse net/netfilter/nf_conntrack_core.c:2252 [inline] nf_ct_iterate_cleanup+0x357/0x3f0 net/netfilter/nf_conntrack_core.c:2275 nf_ct_iterate_cleanup_net+0x172/0x1e0 net/netfilter/nf_conntrack_core.c:2363 iterate_cleanup_work+0x4c/0x100 net/netfilter/nf_nat_masquerade.c:216 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Modules linked in: ---[ end trace 54cacc3305c1d1e1 ]--- 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+0x93/0x1d0 include/linux/percpu-refcount.h:338 Code: 01 48 c7 c7 40 58 52 8a be b1 02 00 00 48 c7 c2 80 58 52 8a e8 de 18 e9 ff 49 bd 00 00 00 00 00 fc ff df 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1e 75 52 00 48 8b 2b 48 89 ee 48 RSP: 0018:ffffc90000dc0b30 EFLAGS: 00010206 RAX: 0000000000000182 RBX: 0000000000000c10 RCX: ffff8880862d9c80 RDX: 0000000080000100 RSI: 0000000000000004 RDI: ffff8880b9d32508 RBP: 000000000000003b R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffff888088dde000 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002001d000 CR3: 0000000081040000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c7 c7 40 58 52 8a mov $0xffffffff8a525840,%rdi 7: be b1 02 00 00 mov $0x2b1,%esi c: 48 c7 c2 80 58 52 8a mov $0xffffffff8a525880,%rdx 13: e8 de 18 e9 ff callq 0xffe918f6 18: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 1f: fc ff df 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 1e 75 52 00 callq 0x527556 38: 48 8b 2b mov (%rbx),%rbp 3b: 48 89 ee mov %rbp,%rsi 3e: 48 rex.W