boinc crashes frequently on mac mini powerpc hardware

[romw]

Reported by fthomas on 3 Dec 38373192 21:20 UTC
This bug has been reported in Debian's BTS (#479204):

boinc-client 5.10.45-2 fails to run for any significant period of time on my powerpc (mac mini) hardware. The version in debian stable works with no trouble (5.4.11-4). Here is a segment from the log file and a back trace using gdb.

log file segment:

 SIGSEGV: segmentation violation
 Stack trace (7 frames):
 /usr/bin/boinc_client[[0x100344](0x100544a0]
)
 /usr/bin/boinc_client[/usr/bin/boinc_client[0x10019f70](0x1003e08c]
)
 /usr/bin/boinc_client[/lib/libc.so.6[0xf9f4720](0x1004397c]
)
 /lib/libc.so.6[```

 gdb session:

(gdb) run --check_all_logins --redirectio --dir /var/lib/boinc-client
Starting program: /usr/bin/boinc_client --check_all_logins --redirectio --dir /var/lib/boinc-client
Thread debugging using libthread_db enabled
Thread 0x48026880 (LWP 19048)

Program received signal SIGSEGV, Segmentation fault.
to Thread 0x48026880 (LWP 19048)
HOST_INFO::users_idle (this=, check_all_logins=false, idle_time_to_run=)
at hostinfo_unix.C:774
774 hostinfo_unix.C: No such file or directory.
in hostinfo_unix.C
(gdb) bt
#0 HOST_INFO::users_idle (this=, check_all_logins=false, idle_time_to_run=)
at hostinfo_unix.C:774
#1 0x10019f70 in CLIENT_STATE::poll_slow_events (this=0x10099878) at client_state.C:499
#2 0x1004397c in boinc_main_loop () at main.C:471
#3 0x0f9f4720 in ?? () from /lib/libc.so.6
#4 0x0f9f48e0 in __libc_start_main () from /lib/libc.so.6
#5 0x00000000 in ?? ()

The code from `client/hostinfo_unix.C` which causes the SIGSEGV is:
```c++
766: inline bool all_tty_idle(time_t t, char *device, char first_char, int num_tty) {
767:     struct stat sbuf;
768:     char *tty_index = device + strlen(device) - 1;
769:     *tty_index = first_char;
770:     for (int i = 0; i < num_tty; i++, (*tty_index)++) {
771:         if (stat(device, &sbuf)) {
772:             // error looking at device; don't try any more
773:             return true;
774:         } else if (sbuf.st_atime >= t) {
775:             return false;
776:         }
777:     }
778:     return true;
779: }

[romw]

Commented by Nicolas on 15 Jan 38373199 16:26 UTC
Can you get the data inside sbuf from gdb? I think just "print sbuf" will recursively output all the structure members.

[romw]

Commented by Nicolas on 29 Aug 38373207 20:00 UTC
Also, why is users_idle getting called with check_all_logins=false if the --check_all_logins argument '''is''' being passed to the program?

[romw]

Commented by Nicolas on 23 Dec 38373232 12:26 UTC
Okay now I'm fully confused.

The backtrace mentions users_idle as the top stack frame, yet that function is in line 870. users_idle calls all_tty_idle only if check_all_logins is true, which according to the backtrace it's not.

Also, the backtrace definitely lacks something. If I put together the backtrace from gdb, and what was printed in the log:

 /usr/bin/boinc_client[= not listed in bt!
 [0x100344](0x100544a0]) = not listed in bt!
 /usr/bin/boinc_client[= *presumably* HOST_INFO::users_idle at hostinfo_unix.C:774
 /usr/bin/boinc_client[0x10019f70](0x1003e08c]) = CLIENT_STATE::poll_slow_events at client_state.C:499
 /usr/bin/boinc_client[= boinc_main_loop at main.C:471
 /lib/libc.so.6[0xf9f4720](0x1004397c]) = ?? () (libc6)
 /lib/libc.so.6[0xf9f48e0] = __libc_start_main () (libc6)

Can you look up what function/line number correspond to 0x1003e08c and 0x100544a0? (addr2line)

[romw]

Commented by davea on 1 Jul 38390117 23:06 UTC
fixed in [14996]