On 29.08.2013, at 22:45, Konstantin Belousov <kostik...@gmail.com> wrote:
> On Wed, Aug 28, 2013 at 06:20:29PM +0400, Dmitry Sivachenko wrote: >> Hello! >> >> I am using very recent FreeBSD-9-STABLE snapshot: >> 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #0 r254986: Wed Aug 28 17:18:57 MSK >> 2013 >> >> I run uwsgi program (ports/www/uwsgi) on that machine. >> >> When uwsgi starts, it forks pre-configured number of worker processes. >> If I raise workers parameter high enough (128), I get kernel panic (100% >> reproducible): >> >> Fatal trap 12: page fault while in kernel mode >> >> If I compile kernel with KDB enabled, I get the following stack: >> >> pmap_demote_pde_locked() >> pmap_copy() >> vmspace_fork() >> fork1() >> sys_fork() >> >> I have only remote console for that machine, so I made 2 screenshots: >> >> 1) http://people.freebsd.org/~demon/screen1.jpg >> Panic screen when kernel has no KDB support compiled in >> >> 2) http://people.freebsd.org/~demon/screen2.jpg >> Panic screen (2nd part) with the above stack shown. > Look up the source line for the pmap_demote_pde_locked()+0x471 for your > kernel. Dump the core from the panic. Kernel dump is not generated (despite it is configured at boot), there is no "Dumping...." message on console. These screenshots shows everything I see on console. I performed some more investigations on this: I have several (14) totally identical configured machines running exactly the same software. Hardware is a bit different though. I tried to analyze motherboard differences but failed to find common things for the affected machines. Under conditions described in my initial e-mail, some of them crash (exactly the same way), some of them do not. I am confident there is no hardware problems, these machines run for months without reboot, as for now I discovered the only way to crash them. I updated one of the affected servers to 10-current and I can state it does not crash anymore with the same usage scenario. _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"