BUG: unable to handle page fault for address: ffffffff8a9240e0
#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: 27697 Comm: syz-executor.2 Not tainted 5.15.0-rc5-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 c3 69 54 fa 4d 85 e4 74 47 e8 b9 69 54 fa 49 8d 7c 24 40 be 04 00 00 00 e8 8a c2 9b fa b8 ff ff ff ff <f0> 41 0f c1 44 24 40 44 8d 68 ff 31 ff 44 89 ee e8 d0 70 54 fa 45
RSP: 0018:ffffc9000b2cfbd0 EFLAGS: 00010246
RAX: 00000000ffffffff RBX: dffffc0000000000 RCX: ffffffff87226e66
RDX: fffffbfff152481d RSI: 0000000000000004 RDI: ffffffff8a9240e0
RBP: ffffe8ffffa4bc80 R08: 0000000000000001 R09: ffffffff8a9240e3
R10: fffffbfff152481c R11: 0000000000000000 R12: ffffffff8a9240a0
R13: ffff888076b82cc8 R14: 0000000000000007 R15: 0000000000000000
FS:  00007ff7866a4700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8a9240e0 CR3: 0000000035f68000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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+0x319/0x760 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:3077
 __do_sys_unshare kernel/fork.c:3151 [inline]
 __se_sys_unshare kernel/fork.c:3149 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3149
 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: 0033:0x7ff78912ea39
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:00007ff7866a4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff789231f60 RCX: 00007ff78912ea39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007ff789188c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd0dca80bf R14: 00007ff7866a4300 R15: 0000000000022000
Modules linked in:
CR2: ffffffff8a9240e0
---[ end trace 0e0e6532a3e7ab31 ]---
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 c3 69 54 fa 4d 85 e4 74 47 e8 b9 69 54 fa 49 8d 7c 24 40 be 04 00 00 00 e8 8a c2 9b fa b8 ff ff ff ff <f0> 41 0f c1 44 24 40 44 8d 68 ff 31 ff 44 89 ee e8 d0 70 54 fa 45
RSP: 0018:ffffc9000b2cfbd0 EFLAGS: 00010246
RAX: 00000000ffffffff RBX: dffffc0000000000 RCX: ffffffff87226e66
RDX: fffffbfff152481d RSI: 0000000000000004 RDI: ffffffff8a9240e0
RBP: ffffe8ffffa4bc80 R08: 0000000000000001 R09: ffffffff8a9240e3
R10: fffffbfff152481c R11: 0000000000000000 R12: ffffffff8a9240a0
R13: ffff888076b82cc8 R14: 0000000000000007 R15: 0000000000000000
FS:  00007ff7866a4700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8a9240e0 CR3: 0000000035f68000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
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 c3 69 54 fa       	callq  0xfa5469cf
   c:	4d 85 e4             	test   %r12,%r12
   f:	74 47                	je     0x58
  11:	e8 b9 69 54 fa       	callq  0xfa5469cf
  16:	49 8d 7c 24 40       	lea    0x40(%r12),%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 8a c2 9b fa       	callq  0xfa9bc2af
  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 d0 70 54 fa       	callq  0xfa54710f
  3f:	45                   	rex.RB