BUG: unable to handle page fault for address: ffffffff8a904800 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD b68f067 P4D b68f067 PUD b690063 PMD 800000000a8001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 1 PID: 10253 Comm: syz-executor.4 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] RIP: 0010:arch_atomic_sub_return arch/x86/include/asm/atomic.h:178 [inline] RIP: 0010:arch_atomic_dec_return include/linux/atomic-arch-fallback.h:527 [inline] RIP: 0010:atomic_dec_return include/asm-generic/atomic-instrumented.h:252 [inline] RIP: 0010:dst_release net/core/dst.c:174 [inline] RIP: 0010:dst_release+0x2b/0xe0 net/core/dst.c:169 Code: 55 41 54 49 89 fc 53 e8 63 21 59 fa 4d 85 e4 74 47 e8 59 21 59 fa 49 8d 7c 24 40 be 04 00 00 00 e8 3a e7 9e fa b8 ff ff ff ff 41 0f c1 44 24 40 44 8d 68 ff 31 ff 44 89 ee e8 e0 29 59 fa 45 RSP: 0018:ffffc9000b9278e0 EFLAGS: 00010246 RAX: 00000000ffffffff RBX: dffffc0000000000 RCX: ffffffff871bbd26 RDX: fffffbfff1520901 RSI: 0000000000000004 RDI: ffffffff8a904800 RBP: ffffe8ffffced740 R08: 0000000000000001 R09: ffffffff8a904803 R10: fffffbfff1520900 R11: 0000000000000000 R12: ffffffff8a9047c0 R13: ffff888021960c88 R14: 0000000000000007 R15: 0000000000000000 FS: 00007f7abce0a700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8a904800 CR3: 0000000031cb1000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dst_cache_destroy net/core/dst_cache.c:160 [inline] dst_cache_destroy+0xcb/0x190 net/core/dst_cache.c:152 ipip6_dev_free net/ipv6/sit.c:1412 [inline] sit_init_net+0x7d8/0xaa0 net/ipv6/sit.c:1934 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 copy_net_ns+0x319/0x760 net/core/net_namespace.c:474 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x2cfc/0x74d0 kernel/fork.c:2122 kernel_clone+0xe7/0xac0 kernel/fork.c:2509 __do_sys_clone+0xc8/0x110 kernel/fork.c:2626 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: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7abce0a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000d3942500 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd6ba5476f R14: 00007f7abce0a300 R15: 0000000000022000 Modules linked in: CR2: ffffffff8a904800 ---[ end trace 9f1a1332912a4e44 ]--- RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] RIP: 0010:arch_atomic_sub_return arch/x86/include/asm/atomic.h:178 [inline] RIP: 0010:arch_atomic_dec_return include/linux/atomic-arch-fallback.h:527 [inline] RIP: 0010:atomic_dec_return include/asm-generic/atomic-instrumented.h:252 [inline] RIP: 0010:dst_release net/core/dst.c:174 [inline] RIP: 0010:dst_release+0x2b/0xe0 net/core/dst.c:169 Code: 55 41 54 49 89 fc 53 e8 63 21 59 fa 4d 85 e4 74 47 e8 59 21 59 fa 49 8d 7c 24 40 be 04 00 00 00 e8 3a e7 9e fa b8 ff ff ff ff 41 0f c1 44 24 40 44 8d 68 ff 31 ff 44 89 ee e8 e0 29 59 fa 45 RSP: 0018:ffffc9000b9278e0 EFLAGS: 00010246 RAX: 00000000ffffffff RBX: dffffc0000000000 RCX: ffffffff871bbd26 RDX: fffffbfff1520901 RSI: 0000000000000004 RDI: ffffffff8a904800 RBP: ffffe8ffffced740 R08: 0000000000000001 R09: ffffffff8a904803 R10: fffffbfff1520900 R11: 0000000000000000 R12: ffffffff8a9047c0 R13: ffff888021960c88 R14: 0000000000000007 R15: 0000000000000000 FS: 00007f7abce0a700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8a904800 CR3: 0000000031cb1000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 55 push %rbp 1: 41 54 push %r12 3: 49 89 fc mov %rdi,%r12 6: 53 push %rbx 7: e8 63 21 59 fa callq 0xfa59216f c: 4d 85 e4 test %r12,%r12 f: 74 47 je 0x58 11: e8 59 21 59 fa callq 0xfa59216f 16: 49 8d 7c 24 40 lea 0x40(%r12),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 3a e7 9e fa callq 0xfa9ee75f 25: b8 ff ff ff ff mov $0xffffffff,%eax 2a: f0 41 0f c1 44 24 40 lock xadd %eax,0x40(%r12) <-- trapping instruction 31: 44 8d 68 ff lea -0x1(%rax),%r13d 35: 31 ff xor %edi,%edi 37: 44 89 ee mov %r13d,%esi 3a: e8 e0 29 59 fa callq 0xfa592a1f 3f: 45 rex.RB