Hi, Thorsten made a fix for the issue. I verified that it works. See git master. It was an alignment problem specific to m68k architecture in the NPTL code. You need to rebuild rsyslog and all dependent libraries to take effect of the fix.
best regards Waldemar Jean-Michel Hautbois wrote, > Hi there, > > I have a quite complex issue, with uclibc-ng (master branch). Here is a > summary. > > Tested with qemu (buildroot for q800) on the m68k architecture, rsyslog > consumes 100% CPU during its pthread_cond_wait() calls. > > This is in [1] in the doIdleProcessing() function. > > Using glibc+m68k does not reveal this issue, and uclibc-ng on arm doesn't > either. > > Strace output shows that the futex_time64() syscall is repeatedly returning > EINVAL, indicating that the call is looping without proper blocking: > # strace -f rsyslogd -dn > <snip> > [pid 110] write(1, "9139.913444393:main Q:Reg/w0 : "..., > 859139.913444393:main Q:Reg/w0 : wti.c: main Q:Reg/w0: worker IDLE, waiting > for work. > ) = 85 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > > Interestingly, a simple test program [2] works fine under similar > conditions. > > I tried to dig and debug, but I can't find out what is the root cause and I > suppose it can occur elsewhere, for another program... > > Hi there, > > I have a quite complex issue, with uclibc-ng. Here is a summary. > Tested with qemu (buildroot for q800) on the m68k architecture, rsyslog > consumes 100% CPU during its pthread_cond_wait() calls. > This is in [1] in the doIdleProcessing() function. > > Using glibc+m68k does not reveal this issue, and uclibc-ng on arm doesn't > either. > > Strace output shows that the futex_time64() syscall is repeatedly returning > EINVAL, indicating that the call is looping without proper blocking: > # strace -f rsyslogd -dn > <snip> > [pid 110] write(1, "9139.913444393:main Q:Reg/w0 : "..., > 859139.913444393:main Q:Reg/w0 : wti.c: main Q:Reg/w0: worker IDLE, waiting > for work. > ) = 85 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] get_thread_area() = 0xc0b73970 > [pid 110] futex_time64(0x8009aee2, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 > EINVAL (Invalid argument) > > Interestingly, a simple test program [2] works fine under similar > conditions. > > I tried to dig and debug, but I can't find out what is the root cause and I > suppose it can occur elsewhere, for another program... > > Any help or suggestions would be appreciated! > > [1]: https://github.com/rsyslog/rsyslog/blob/master/runtime/wti.c#L362 > [2]: https://www.geeksforgeeks.org/condition-wait-signal-multi-threading/ > > Thanks ! > JM > _______________________________________________ > devel mailing list -- devel@uclibc-ng.org > To unsubscribe send an email to devel-le...@uclibc-ng.org > _______________________________________________ devel mailing list -- devel@uclibc-ng.org To unsubscribe send an email to devel-le...@uclibc-ng.org
