general protection fault in ip6gre_exit_batch

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in ip6gre_exit_batch_net net				1	1251d	1251d	0/28	auto-closed as invalid on 2021/09/29 10:35

kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 27240 Comm: kworker/u4:9 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:ip6gre_destroy_tunnels net/ipv6/ip6_gre.c:1562 [inline] RIP: 0010:ip6gre_exit_batch_net+0x25c/0x6c0 net/ipv6/ip6_gre.c:1634 Code: f4 48 8d 58 b0 75 41 e9 8c 00 00 00 e8 ed b6 43 fa 49 81 fe 40 92 28 8b 74 6a e8 df b6 43 fa 4c 8d 73 50 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 09 04 00 00 48 8b 43 50 48 89 dd 48 83 e8 50 RSP: 0018:ffff888048c07b70 EFLAGS: 00010206 RAX: 000ee00ee00ee000 RBX: 007700770076ffb0 RCX: 1ffff1101298b1e5 RDX: 0000000000000000 RSI: ffffffff871ece91 RDI: ffff888000102d88 RBP: ffff888000102340 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880964a1b70 R13: dffffc0000000000 R14: 0077007700770000 R15: ffff8880964a19c0 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6396b5000 CR3: 00000000a57c7000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Modules linked in: ---[ end trace d901c593e602e5b9 ]--- RIP: 0010:ip6gre_destroy_tunnels net/ipv6/ip6_gre.c:1562 [inline] RIP: 0010:ip6gre_exit_batch_net+0x25c/0x6c0 net/ipv6/ip6_gre.c:1634 Code: f4 48 8d 58 b0 75 41 e9 8c 00 00 00 e8 ed b6 43 fa 49 81 fe 40 92 28 8b 74 6a e8 df b6 43 fa 4c 8d 73 50 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 09 04 00 00 48 8b 43 50 48 89 dd 48 83 e8 50 RSP: 0018:ffff888048c07b70 EFLAGS: 00010206 RAX: 000ee00ee00ee000 RBX: 007700770076ffb0 RCX: 1ffff1101298b1e5 RDX: 0000000000000000 RSI: ffffffff871ece91 RDI: ffff888000102d88 RBP: ffff888000102340 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880964a1b70 R13: dffffc0000000000 R14: 0077007700770000 R15: ffff8880964a19c0 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3a873f5fc0 CR3: 0000000092ad3000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f4 hlt 1: 48 8d 58 b0 lea -0x50(%rax),%rbx 5: 75 41 jne 0x48 7: e9 8c 00 00 00 jmpq 0x98 c: e8 ed b6 43 fa callq 0xfa43b6fe 11: 49 81 fe 40 92 28 8b cmp $0xffffffff8b289240,%r14 18: 74 6a je 0x84 1a: e8 df b6 43 fa callq 0xfa43b6fe 1f: 4c 8d 73 50 lea 0x50(%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 0f 85 09 04 00 00 jne 0x43e 35: 48 8b 43 50 mov 0x50(%rbx),%rax 39: 48 89 dd mov %rbx,%rbp 3c: 48 83 e8 50 sub $0x50,%rax