<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/61484>61484</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Add timeout to connecting to debuginfod servers
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          russelltg
      </td>
    </tr>
</table>

<pre>
    We have a debuginfod server behind our VPN, so it is only available when connected to the VPN. Currently, it will hang forever if not on the VPN. Easy repro:

```bash
DEBUGINFOD_URLS="http://192.168.10.103:8002" llvm-debuginfod-find-15 --executable d3397e038155fe9d
```

When I connect to the VPN, it works properly, however I would expect it to eventually time out. It's clear that this is what's going on from the output of strace:

```
$ DEBUGINFOD_URLS="http://192.168.10.103:8002" strace llvm-debuginfod-find-15 --executable d3397e038155fe9d
...
openat(AT_FDCWD, "/home/russell/.cache/llvm-debuginfod/client/llvmcache-7696581620544652856", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0
fcntl(3, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
fcntl(4, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
rt_sigaction(SIGPIPE, NULL, {sa_handler=0x7fa3ddb44770, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=3, events=POLLIN}], 1, 0)     = 0 (Timeout)
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
setsockopt(5, SOL_TCP, TCP_NODELAY, [1], 4) = 0
fcntl(5, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
connect(5, {sa_family=AF_INET, sin_port=htons(8002), sin_addr=inet_addr("192.168.10.103")}, 16) = -1 EINPROGRESS (Operation now in progress)
poll([{fd=5, events=POLLPRI|POLLOUT|POLLWRNORM}], 1, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLOUT}, {fd=3, events=POLLIN}], 2, 199) = 0 (Timeout)
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLPRI|POLLOUT|POLLWRNORM}], 1, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLOUT}, {fd=3, events=POLLIN}], 2, 1) = 0 (Timeout)
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLPRI|POLLOUT|POLLWRNORM}], 1, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLOUT}, {fd=3, events=POLLIN}], 2, 1000) = 0 (Timeout)
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLPRI|POLLOUT|POLLWRNORM}], 1, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLOUT}, {fd=3, events=POLLIN}], 2, 1000) = 0 (Timeout)
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLPRI|POLLOUT|POLLWRNORM}], 1, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLOUT}, {fd=3, events=POLLIN}], 2, 1000) = 0 (Timeout)
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND, sa_restorer=0x7fa3dc672520}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
poll([{fd=5, events=POLLPRI|POLLOUT|POLLWRNORM}], 1, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|0xffffffff00000000, sa_restorer=0x7fa3dc672520}, NULL, 8) = 0
...
```

IMO the most sane behavior would be a shortish (maybe 15 second?) default timeout and a commandline parameter to tune it. 

I'm happy to implement this if there is interest!
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWVFvq7gS_jXOi9UIDATykIc0JL3o5ECUpLe7T8iBIfgesJFt2ubfXxlI25v2SL3dXa3OKqhqDfaMv_k834A6VCl25AAz5N0iLxzRVpdCzmSrFFSVPo4OIj_NHgCX9BEwxTkc2iPjhcixAvkIEh-gZDzHopX435sYkQVWAjONmcKCVydMHymr6KEC_FQCx5ngHDINOdYC6xKM0RgvWimB6-pk7JnGT6yqcEn5ERdCgtmGFZgLjQV_NVpSdcISGimQM0dWiKzz74nV_xyoKvtH4fL2_i6KV0mY3m_XO-SEiJBS68aYkhUiK3tKxvYkGNvW2LYc5MwDyyKIEFxVj_XNa9w3BeP5je3hmxt4hqzVXWy540x9sJzA9rwCpvkFkLfoHgwN0ZmINzScYxfyh8KNFA3InpBSPHUcRPhJtFWO4bkxlqwzhkfguqVVdcKa1YBFq8c40oj4CmcVUIl1STXWJVPmTJ5K2s8dBeNHw2chRd1BEK1uWo1FgZWWNIOfsTrcEhf_AVb7Lf4IuePxuB-IBrgJKpjv01W4eAgNZ4gQRFalqAGR1ZDOiKzGGc1K8-hiY0RWWcWA62GqW3bjT6YTL7AnxPJcd-KRwJt0fhc4SbdhEq9_R_4iSRfrZPnbcoHIFCMnxDc2XsbJMt5jRIJYYNVmJS5YBVhInDMJmRbyhMi0h69E9gM6-Ks0ipf7ifG_Sxbf0vBuO_9u7qLNZpvskzTanPdwetusEgoQCZzzc-utz4Yy2fu9j6PfXtzu9ttl79fqmPJuHfPXRV544abIuK569wu8Su-W-9XaLPn46gyfiYm6qOhRdSQ9bF8CvfC2670tzssMk3ES366Txbdhkw-guBdQPrup-5VNpU4VO9JMM8ERCXbR3SbaLI15fL_u3CD_VtG0pDyvQCIntJ79gjp5fnBd3-_oVTStqfphtNGV2OFZBxY54W6ebpe7fbJdGjC7eZrEu_188a2_iZNwuTrPbJe75f5f8_jsQoLSQr7dNpv4xCMW8rslwcVp_jyayyh20V0a3cV_FXx_YT0Xw2UN1ydjOvN-GVsjjLwDg9G_LXLkhF2WdcXR4Nwk63UUGyd9CPaQ_tPXzDUptGc1iFa_ZM__nwB_MXXXk7-M7bJ8flDm3pdPb7AFbcxFY-y93nKd7hcbM9wvNl0Y6_nvQ5m0Bxbcn5RJ708tk95XKtbwVXE274-3oDWrTsgJ31CkGE8bITVywlILrhAJ-lfz9DxL89wcBuOg-zEJECEXL3TSWfQnZE_evgGjeLNN7rbL3c5EmjQgqUk_zMUTZtx83xwlKPUS9nsFe-8UvNlGyF-YUXK_H0YP2zjZfv9I2V9Q9a8vh8_Q2JEXDvF-olh2Xzz2dPpFUq-l8hfKjavE_kaJXQX2z8-Mq8D-RoF12K4a-6cnx1VjV41dNXbV2C9A41VjV41dNfZ1Gl-6QB_22qLvSdfaqoXSWFEO-AAlfWRCDq20A2CKVSmkZqo03NX0dABse1hBJniOnJXZMIeCtpXuOmyi1ZjyHFOcibo21DEOuKGS1qBBdg29lgNmeoz_Bwsifo1L2jQns4bVTQU18HNrrjBAJWAz5hoMH4jYo3zm5FNnSkcwsyf-1PInjjMZlTNa0KnjZVbuuBPrQCH3_OxgUbCC3Hdt4o7YjFjEsRzbtwPLcybjICOuVbjT3AZqF26AXAtqyqpxVT3WYyGPI6ZUC7OJ7QbuqKIHqFTXFiaEwxPuJhEhyAtHcta1zw7tUSHXqpjS6tWLZrqC2TzPX9jS4tztZPxo7t51kdWoldWs1LpRL63DI9Nlexhnoh56cueuXSPFf7r_ca46TAqRVYf5vwEAAP__t9i79Q">