View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0003916 | libmicrohttpd | other | public | 2015-07-25 15:50 | 2015-09-16 14:32 |
| Reporter | Christian Grothoff | Assigned To | Christian Grothoff | ||
| Priority | normal | Severity | crash | Reproducibility | have not tried |
| Status | closed | Resolution | no change required | ||
| Platform | i7 | OS | Debian GNU/Linux | OS Version | squeeze |
| Product Version | 0.9.43 | ||||
| Target Version | 0.9.42 | Fixed in Version | 0.9.43 | ||
| Summary | 0003916: Segfault after MHD_quiesce_daemon() | ||||
| Description | Markus Doppelbauer reported on the mailinglist: Sorry - I can't provide a testcase - I only have the coredumps. IMHO the problem is, that two threads work in the same critical section MHD_cleanup_connections() #1 MHD-Thread from microhttpd/daemon.c:2937 from MHD_select_thread() #2 Worker-thread from microhttpd/daemon.c:4630 from MHD_get_daemon_info( MHD_DAEMON_INFO_CURRENT_CONNECTIONS ) Both threads meet each other in MHD_cleanup_connections() Down below an other core-dump. In that case the worker-thread crashed. Thanks a lot Markus # Main-Thread after MHD_quiesce_daemon() #1 0x0000003bd6e33e05 in abort () from /lib64/libc.so.6 No symbol table info available. #2 0x0000003bd6e70537 in __libc_message () from /lib64/libc.so.6 No symbol table info available. #3 0x0000003bd6e75e66 in malloc_printerr () from /lib64/libc.so.6 No symbol table info available. #4 0x000000000045fc2a in MHD_cleanup_connections (daemon=0x28d8bf0) at microhttpd/daemon.c:2038 pos = 0x7fb4f00009c0 #5 0x000000000045ff54 in MHD_get_daemon_info (daemon=0x28cf9f0, info_type=<value optimized out>) at microhttpd/daemon.c:4630 i = <value optimized out> # MHD-Thread #0 0x0000003bd720e264 in __lll_lock_wait () from /lib64/libpthread.so.0 No symbol table info available. #1 0x0000003bd7209508 in _L_lock_854 () from /lib64/libpthread.so.0 No symbol table info available. #2 0x0000003bd72093d7 in pthread_mutex_lock () from /lib64/libpthread.so.0 No symbol table info available. #3 0x00000000006c73fe in http_NotifyConnectionCallback (cls=0x7fff32d7a1e0, connection=<value optimized out>, socket_context=<value optimized out>, toe=<value optimized out>) at global/daemon.cpp:1782 daemonqueue = 0x7fff32d7a1e0 #4 0x000000000045fc5a in MHD_cleanup_connections (daemon=0x28d8bf0) at microhttpd/daemon.c:2046 pos = 0x7fb4f00009c0 #5 0x0000000000463a25 in MHD_select_thread (cls=0x28d8bf0) at microhttpd/daemon.c:2937 daemon = 0x28d8bf0 #6 0x0000003bd72079d1 in start_thread () from /lib64/libpthread.so.0 No symbol table info available. #7 0x0000003bd6ee88fd in clone () from /lib64/libc.so.6 No symbol table info available. Hi, Maybe it is not allowed to call MHD_get_daemon_info( MHD_DAEMON_INFO_CURRENT_CONNECTIONS ) at any time from any thread? Maybe only from MHD_NotifyConnectionCallback() ? Thanks a lot Markus Hello, Since I have moved the call MHD_get_daemon_info( MHD_DAEMON_INFO_CURRENT_CONNECTIONS ) to MHD_NotifyConnectionCallback() no segfaults did occur. Could this be true? Maybe update the documentation? Thanks a lot Markus | ||||
| Tags | No tags attached. | ||||
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Markus now writes: Die Sache war wohl mein Fehler - ich habe die Funktion MHD_get_daemon_info( MHD_DAEMON_INFO_CURRENT_CONNECTIONS ) von einem unbeteiligtem Thread aus augerufen. Bitte die beiden issues schließen - und danke für die Hilfe. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2015-07-25 15:50 | Christian Grothoff | New Issue | |
| 2015-07-25 15:51 | Christian Grothoff | Status | new => acknowledged |
| 2015-09-16 14:31 | Christian Grothoff | Note Added: 0009631 | |
| 2015-09-16 14:32 | Christian Grothoff | Assigned To | => Christian Grothoff |
| 2015-09-16 14:32 | Christian Grothoff | Status | acknowledged => closed |
| 2015-09-16 14:32 | Christian Grothoff | Resolution | open => no change required |
| 2015-09-16 14:32 | Christian Grothoff | Product Version | => 0.9.43 |
| 2015-09-16 14:32 | Christian Grothoff | Fixed in Version | => 0.9.43 |
| 2015-09-16 14:32 | Christian Grothoff | Target Version | => 0.9.42 |
