BUG: unable to handle page fault for address: ffffffff8a785040 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD c88f067 P4D c88f067 PUD c890063 PMD 800000000a6001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3141 Comm: syz-executor.1 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_sub_return arch/x86/include/asm/atomic.h:178 [inline] RIP: 0010:arch_atomic_dec_return include/linux/atomic/atomic-arch-fallback.h:527 [inline] RIP: 0010:atomic_dec_return include/linux/atomic/atomic-instrumented.h:252 [inline] RIP: 0010:dst_release+0x24/0xe0 net/core/dst.c:172 Code: 84 00 00 00 00 00 55 41 56 53 49 89 fe e8 24 ed 5f f9 4d 85 f6 74 3b 49 8d 7e 40 be 04 00 00 00 e8 81 c2 ab f9 bb ff ff ff ff 41 0f c1 5e 40 8d 73 ff 31 ff e8 0c f1 5f f9 ff cb 78 1b 31 ff RSP: 0018:ffffc900051c7720 EFLAGS: 00010256 RAX: ffffffff88249b01 RBX: 00000000ffffffff RCX: ffffffff88249b1f RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8a785040 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff14f0a09 R10: fffffbfff14f0a09 R11: 0000000000000000 R12: 0000607f462851a0 R13: 1ffffffff1bfd1cd R14: ffffffff8a785000 R15: dffffc0000000000 FS: 00007f981d2b4700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8a785040 CR3: 000000008185f000 CR4: 00000000003506e0 Call Trace: dst_cache_destroy+0x107/0x1e0 net/core/dst_cache.c:160 ipip6_dev_free net/ipv6/sit.c:1414 [inline] sit_init_net+0x229/0x550 net/ipv6/sit.c:1936 ops_init+0x313/0x430 net/core/net_namespace.c:140 setup_net+0x35b/0x9d0 net/core/net_namespace.c:326 copy_net_ns+0x359/0x5c0 net/core/net_namespace.c:470 create_new_namespaces+0x4ce/0xa00 kernel/nsproxy.c:110 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178 copy_process+0x2968/0x5ca0 kernel/fork.c:2194 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582 __do_sys_clone kernel/fork.c:2699 [inline] __se_sys_clone kernel/fork.c:2683 [inline] __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f981fd80ae9 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:00007f981d2b4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f981fe940e0 RCX: 00007f981fd80ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000070224100 RBP: 00007f981fddaf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd7fa31c9f R14: 00007f981d2b4300 R15: 0000000000022000 Modules linked in: CR2: ffffffff8a785040 ---[ end trace ac5dbb766c7e0739 ]--- RIP: 0010:arch_atomic_sub_return arch/x86/include/asm/atomic.h:178 [inline] RIP: 0010:arch_atomic_dec_return include/linux/atomic/atomic-arch-fallback.h:527 [inline] RIP: 0010:atomic_dec_return include/linux/atomic/atomic-instrumented.h:252 [inline] RIP: 0010:dst_release+0x24/0xe0 net/core/dst.c:172 Code: 84 00 00 00 00 00 55 41 56 53 49 89 fe e8 24 ed 5f f9 4d 85 f6 74 3b 49 8d 7e 40 be 04 00 00 00 e8 81 c2 ab f9 bb ff ff ff ff 41 0f c1 5e 40 8d 73 ff 31 ff e8 0c f1 5f f9 ff cb 78 1b 31 ff RSP: 0018:ffffc900051c7720 EFLAGS: 00010256 RAX: ffffffff88249b01 RBX: 00000000ffffffff RCX: ffffffff88249b1f RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8a785040 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff14f0a09 R10: fffffbfff14f0a09 R11: 0000000000000000 R12: 0000607f462851a0 R13: 1ffffffff1bfd1cd R14: ffffffff8a785000 R15: dffffc0000000000 FS: 00007f981d2b4700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8a785040 CR3: 000000008185f000 CR4: 00000000003506e0 ---------------- Code disassembly (best guess): 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 55 push %rbp 7: 41 56 push %r14 9: 53 push %rbx a: 49 89 fe mov %rdi,%r14 d: e8 24 ed 5f f9 callq 0xf95fed36 12: 4d 85 f6 test %r14,%r14 15: 74 3b je 0x52 17: 49 8d 7e 40 lea 0x40(%r14),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 81 c2 ab f9 callq 0xf9abc2a6 25: bb ff ff ff ff mov $0xffffffff,%ebx * 2a: f0 41 0f c1 5e 40 lock xadd %ebx,0x40(%r14) <-- trapping instruction 30: 8d 73 ff lea -0x1(%rbx),%esi 33: 31 ff xor %edi,%edi 35: e8 0c f1 5f f9 callq 0xf95ff146 3a: ff cb dec %ebx 3c: 78 1b js 0x59 3e: 31 ff xor %edi,%edi