Crash on iOS 14.5：nw_endpoint_flow_copy_path + 44

App & System Services Core OS
carrieni OP
Created Apr ’21
Replies 34
Boosts 0
Views 15k
Participants 20
Hi，
Apps crashed when enter foreground and want to connect with server，since iOS 14.5 released on April 27。

Crash stack like this：

Monitor Type: Mach Exception
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000010
Crashed Thread: 40
Pthread id: 867350
Thread 40 Crashed:
0 libnetwork.dylib nw_endpoint_flow_copy_path + 44
1 libnetwork.dylib nw_endpoint_flow_copy_path + 40
2 libnetwork.dylib nw_endpoint_flow_connected + 320
3 libnetwork.dylib nw_flow_connected + 3668
4 libnetwork.dylib nw_socket_connect + 584
5 libnetwork.dylib nw_endpoint_flow_connect + 164
6 libnetwork.dylib nw_endpoint_flow_setup_protocols + 3272
7 libnetwork.dylib -[NWConcrete_nw_endpoint_flow startWithHandler:] + 3616
8 libnetwork.dylib nw_endpoint_handler_path_change + 10592
9 libnetwork.dylib nw_endpoint_handler_start + 1184
10 libnetwork.dylib __nw_connection_start_block_invoke + 1460
11 imeituan __innerBlockOnce_block_invoke (SCRCrashMonitor_GCD.mm:191)
12 libdispatch.dylib _dispatch_call_block_and_release + 32
13 libdispatch.dylib _dispatch_client_callout + 20
14 libdispatch.dylib _dispatch_lane_serial_drain + 620
15 libdispatch.dylib _dispatch_lane_invoke + 456
16 libdispatch.dylib _dispatch_workloop_invoke + 1680
17 libdispatch.dylib _dispatch_workloop_worker_thread + 764
18 libsystem_pthread.dylib _pthread_wqthread + 276
Enqueue thread backtrace:
0 imeituan innerBlockOnce (SCRCrashMonitor_GCD.mm:0)
1 imeituan _dispatch_async (SCRCrashMonitor_GCD.mm:0)
2 libnetwork.dylib nw_connection_start + 280
3 libnetwork.dylib tcp_connection_start + 1496
4 CFNetwork 0x0000000180b7c3bc + 168
5 CFNetwork 0x0000000180b79b80 + 2776
6 CFNetwork 0x0000000180b77918 + 1724
7 CoreFoundation _CFStreamOpen + 140
8 imeituan -[GCDAsyncSocket openStreams] (GCDAsyncSocket.m:6998)
9 imeituan __29-[GCDAsyncSocket didConnect:]_block_invoke330 (GCDAsyncSocket.m:2369)
10 imeituan __29-[GCDAsyncSocket didConnect:]_block_invoke_2 (GCDAsyncSocket.m:2396)
11 imeituan __innerBlockOnce_block_invoke (SCRCrashMonitor_GCD.mm:191)
12 libdispatch.dylib _dispatch_call_block_and_release + 32
13 libdispatch.dylib _dispatch_client_callout + 20
14 libdispatch.dylib _dispatch_lane_serial_drain + 620
15 libdispatch.dylib _dispatch_lane_invoke + 404
16 libdispatch.dylib _dispatch_workloop_worker_thread + 764
17 libsystem_pthread.dylib _pthread_wqthread + 276
18 libsystem_pthread.dylib start_wqthread + 8
Replies  34
Boosts  0
Views  15k
Participants  20
DTS Engineer OP
Apple
Apr ’21

Apps crashed when enter foreground and want to connect with server

Please post a full Apple crash report. Use the text attachment feature (the paperclip icon) to avoid clogging up the timeline.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
1
averagejjjjjjoe OP
Apr ’21
We are experiencing this as well, #1 crash in iOS 14.5 devices in our app. Same stacktrace in the crashed thread.
1
naikunwang OP
Apr ’21
i have same crash , how can i fix it ?
0
d@n OP
May ’21
same crash reported,,, iOS 14.5 and 14.6beta
0
Adithya Reddy OP
May ’21
Crashed: com.apple.network.connection-65
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000010
nw_endpoint_flow_copy_path

experiencing the same crash as well.
iOS versions (14.5 and 14.6)

Soaring since April 27th.
0
DTS Engineer OP
Apple
May ’21
averagejjjjjjoe, naikunwang, d@n, Adithya Reddy, per my initial response, I’m not going to be able to provide any further insight here without an Apple crash report. If you have one, please post it.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
0
autobotCA OP
May ’21
Here is a crash report

CrashReport




0
autobotCA OP
May ’21
Here is a second crash report from a more modern version
Crashreport 2


0
DTS Engineer OP
Apple
May ’21
Thanks for the crash reports. These were enough to point me to a bug (r. 71651938) that we’re using to track this crash. I don’t have a lot of info to share but I can say that:

  • There are a wide range of apps experiencing the problem and thus it’s most likely a problem in the OS rather than a problem with your code.

  • Based on our analysis so far this seems to be an iOS 14.5 regression.

Normally I’d recommend that you file your own bug about this, with whatever extra info you have to help the Network framework folks debug it, but in this case I happen to know (via other channels) that you’ve already done that.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
0
Wingzki OP
May ’21
We got more information about this.

2021-05-07 14:09:31.538353+0800 Hello[1986:2515251] [] nw_path_evaluator_create_flow_inner NECP_CLIENT_ACTION_ADD_FLOW 0A158B95-F5ED-4E9B-8D68-4BDC211744F9 [48: Address already in use]
2021-05-07 14:09:31.538839+0800 Hello[1986:2515251] [connection] nw_endpoint_flow_setup_channel [C16.1 123.125.102.213:5222 in_progress channel-flow (satisfied (Path is satisfied), interface: en0, scoped, ipv4, dns)] failed to request add nexus flow
2021-05-07 14:09:31.541714+0800 Hello[1986:2515251] [] nw_path_evaluator_create_flow_inner NECP_CLIENT_ACTION_ADD_FLOW 81D30F6B-0642-49B1-A0F4-C756CA26B1F9 [48: Address already in use]
2021-05-07 14:09:31.541917+0800 Hello[1986:2515251] [connection] nw_endpoint_flow_setup_channel [C16.2 123.125.102.213:5222 in_progress channel-flow (satisfied (Path is satisfied), interface: en0, scoped, ipv4, dns)] failed to request add nexus flow
2021-05-07 14:09:31.543370+0800 Hello[1986:2515251] [] nw_socket_copy_fd_wrapper called with null protocol
2021-05-07 14:09:31.546335+0800 Hello[1986:2515251] [] nw_socket_copy_fd_wrapper called with null protocol, dumping


Thread 6 Queue : com.apple.network.connection-16


0
carrieni OP
May ’21
What is the reason? How to fix it? eskimo 
Crash Report


0
DTS Engineer OP
Apple
May ’21

What is the reason?

Please read my previous response. If anything in that response was unclear, feel free to post a specific question that references it.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
0
sukov OP
May ’21
hi @eskimo.
I read your response but do you have any workaround solution for the app side?
It's hard for us if nothing to do with this crash

Thanks
0
a20251313 OP
May ’21
Crashed:
nw_endpoint_flow_copy_path

experiencing the same crash as well. 
iOS versions (14.5 and 14.5.1)

Soaring since April 27th.

Over 7000 devices one day.
0
DTS Engineer OP
Apple
May ’21

do you have any workaround solution for the app side?

Quick question: Are you using a third-party library for your networking? Perhaps GCDAsyncSocket?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
1
Crash on iOS 14.5：nw_endpoint_flow_copy_path + 44
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