BUG: unable to handle page fault for address: ffffffff8ab3f660 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD b88f067 P4D b88f067 PUD b890063 PMD 800000000aa001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 0 PID: 25382 Comm: syz-executor.4 Not tainted 5.16.0-rc1-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/atomic-arch-fallback.h:527 [inline] RIP: 0010:atomic_dec_return include/linux/atomic/atomic-instrumented.h:252 [inline] RIP: 0010:dst_release net/core/dst.c:172 [inline] RIP: 0010:dst_release+0x2b/0xe0 net/core/dst.c:167 Code: 55 41 54 49 89 fc 53 e8 33 2d 4a fa 4d 85 e4 74 47 e8 29 2d 4a fa 49 8d 7c 24 40 be 04 00 00 00 e8 2a e9 90 fa b8 ff ff ff ff 41 0f c1 44 24 40 44 8d 68 ff 31 ff 44 89 ee e8 20 2f 4a fa 45 RSP: 0018:ffffc9001cbcfbd0 EFLAGS: 00010246 RAX: 00000000ffffffff RBX: dffffc0000000000 RCX: ffffffff872d6c46 RDX: fffffbfff1567ecd RSI: 0000000000000004 RDI: ffffffff8ab3f660 RBP: ffffe8ffffcbb5c0 R08: 0000000000000001 R09: ffffffff8ab3f663 R10: fffffbfff1567ecc R11: 0000000000000000 R12: ffffffff8ab3f620 R13: ffff888074dc6cc8 R14: 0000000000000007 R15: 0000000000000000 FS: 00007f372bfc6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8ab3f660 CR3: 00000001f993c000 CR4: 00000000003506f0 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:1414 [inline] sit_init_net+0x7d8/0xaa0 net/ipv6/sit.c:1936 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3075 __do_sys_unshare kernel/fork.c:3146 [inline] __se_sys_unshare kernel/fork.c:3144 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3144 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: 0033:0x7f372ea50ae9 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:00007f372bfc6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f372eb63f60 RCX: 00007f372ea50ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00007f372eaaaf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f372f097b2f R14: 00007f372bfc6300 R15: 0000000000022000 Modules linked in: CR2: ffffffff8ab3f660 ---[ end trace e14fcebc51ae6567 ]--- 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/atomic-arch-fallback.h:527 [inline] RIP: 0010:atomic_dec_return include/linux/atomic/atomic-instrumented.h:252 [inline] RIP: 0010:dst_release net/core/dst.c:172 [inline] RIP: 0010:dst_release+0x2b/0xe0 net/core/dst.c:167 Code: 55 41 54 49 89 fc 53 e8 33 2d 4a fa 4d 85 e4 74 47 e8 29 2d 4a fa 49 8d 7c 24 40 be 04 00 00 00 e8 2a e9 90 fa b8 ff ff ff ff 41 0f c1 44 24 40 44 8d 68 ff 31 ff 44 89 ee e8 20 2f 4a fa 45 RSP: 0018:ffffc9001cbcfbd0 EFLAGS: 00010246 RAX: 00000000ffffffff RBX: dffffc0000000000 RCX: ffffffff872d6c46 RDX: fffffbfff1567ecd RSI: 0000000000000004 RDI: ffffffff8ab3f660 RBP: ffffe8ffffcbb5c0 R08: 0000000000000001 R09: ffffffff8ab3f663 R10: fffffbfff1567ecc R11: 0000000000000000 R12: ffffffff8ab3f620 R13: ffff888074dc6cc8 R14: 0000000000000007 R15: 0000000000000000 FS: 00007f372bfc6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8ab3f660 CR3: 00000001f993c000 CR4: 00000000003506f0 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 33 2d 4a fa callq 0xfa4a2d3f c: 4d 85 e4 test %r12,%r12 f: 74 47 je 0x58 11: e8 29 2d 4a fa callq 0xfa4a2d3f 16: 49 8d 7c 24 40 lea 0x40(%r12),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 2a e9 90 fa callq 0xfa90e94f 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 20 2f 4a fa callq 0xfa4a2f5f 3f: 45 rex.RB