Hello, syzbot found the following crash on: HEAD commit: 39884604 mptcp: fix NULL ptr dereference in MP_JOIN error .. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=125d5d16100000 kernel config: https://syzkaller.appspot.com/x/.config?x=55b0bb710b7fdf44 dashboard link: https://syzkaller.appspot.com/bug?extid=4fceeb0d2fc702d5d41e compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4fceeb0d2fc702d5d41e@xxxxxxxxxxxxxxxxxxxxxxxxx traps: PANIC: double fault, error_code: 0x0 double fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 29146 Comm: syz-executor.1 Not tainted 5.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:179 [inline] RIP: 0010:mark_lock+0x116/0xf10 kernel/locking/lockdep.c:3912 Code: 89 f8 48 c1 e8 03 0f b6 04 10 84 c0 74 08 3c 03 0f 8e e3 0b 00 00 0f b7 55 20 66 81 e2 ff 1f 0f b7 d2 be 08 00 00 00 48 89 d0 <48> 89 14 24 48 c1 f8 06 48 8d 3c c5 a0 a9 30 8c e8 85 42 58 00 48 RSP: 0018:ffffc8fffffffff8 EFLAGS: 00010002 RAX: 000000000000002c RBX: 1ffff92000000005 RCX: ffffffff815935f7 RDX: 000000000000002c RSI: 0000000000000008 RDI: ffff88808fed2080 RBP: ffff88808fed2a10 R08: 0000000000000000 R09: fffffbfff1861559 R10: ffffffff8c30aac7 R11: fffffbfff1861558 R12: 0000000000000008 R13: ffff88808fed2080 R14: 0000000000000005 R15: ffff88808fed2a30 FS: 00000000015ee940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc8ffffffffe8 CR3: 000000009402e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> mark_usage kernel/locking/lockdep.c:3860 [inline] __lock_acquire+0x9a4/0x4c50 kernel/locking/lockdep.c:4309 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:601 [inline] sock_map_unhash+0x38/0x380 net/core/sock_map.c:1233 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 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net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 sock_map_unhash+0x303/0x380 net/core/sock_map.c:1238 tcp_set_state+0x579/0x780 net/ipv4/tcp.c:2261 tcp_done+0xdc/0x380 net/ipv4/tcp.c:4003 tcp_reset+0x128/0x4e0 net/ipv4/tcp_input.c:4113 tcp_validate_incoming+0xa51/0x16b0 net/ipv4/tcp_input.c:5514 tcp_rcv_established+0x69a/0x1d90 net/ipv4/tcp_input.c:5722 tcp_v6_do_rcv+0x418/0x1290 net/ipv6/tcp_ipv6.c:1449 tcp_v6_rcv+0x2d07/0x3640 net/ipv6/tcp_ipv6.c:1682 ip6_protocol_deliver_rcu+0x2e6/0x1660 net/ipv6/ip6_input.c:433 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:474 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0xcf/0x3d0 net/ipv6/ip6_input.c:483 dst_input include/net/dst.h:441 [inline] ip6_rcv_finish+0x1d9/0x310 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0xf8/0x3f0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5268 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5382 process_backlog+0x21e/0x7a0 net/core/dev.c:6214 napi_poll net/core/dev.c:6659 [inline] net_rx_action+0x4c2/0x1070 net/core/dev.c:6727 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 </IRQ> do_softirq.part.0+0x10f/0x160 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] inet_csk_listen_stop+0x2b8/0xb20 net/ipv4/inet_connection_sock.c:1034 tcp_close+0xe3d/0x1250 net/ipv4/tcp.c:2364 inet_release+0xe4/0x1f0 net/ipv4/af_inet.c:428 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:475 __sock_release+0xcd/0x280 net/socket.c:605 sock_close+0x18/0x20 net/socket.c:1278 __fput+0x33e/0x880 fs/file_table.c:280 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2fa/0x360 arch/x86/entry/common.c:165 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x416661 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffefd7b28b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416661 RDX: 0000000000000000 RSI: 0000000000000d9f RDI: 0000000000000004 RBP: 0000000000000001 R08: 000000007b7b0d9f R09: 000000007b7b0da3 R10: 00007ffefd7b29a0 R11: 0000000000000293 R12: 000000000078c900 R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078bf0c Modules linked in: ---[ end trace 500deeb1423f1fcc ]--- RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:179 [inline] RIP: 0010:mark_lock+0x116/0xf10 kernel/locking/lockdep.c:3912 Code: 89 f8 48 c1 e8 03 0f b6 04 10 84 c0 74 08 3c 03 0f 8e e3 0b 00 00 0f b7 55 20 66 81 e2 ff 1f 0f b7 d2 be 08 00 00 00 48 89 d0 <48> 89 14 24 48 c1 f8 06 48 8d 3c c5 a0 a9 30 8c e8 85 42 58 00 48 RSP: 0018:ffffc8fffffffff8 EFLAGS: 00010002 RAX: 000000000000002c RBX: 1ffff92000000005 RCX: ffffffff815935f7 RDX: 000000000000002c RSI: 0000000000000008 RDI: ffff88808fed2080 RBP: ffff88808fed2a10 R08: 0000000000000000 R09: fffffbfff1861559 R10: ffffffff8c30aac7 R11: fffffbfff1861558 R12: 0000000000000008 R13: ffff88808fed2080 R14: 0000000000000005 R15: ffff88808fed2a30 FS: 00000000015ee940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc8ffffffffe8 CR3: 000000009402e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
