Re: Kernel crashes after sleep: how to debug?
On 07/16/2013 08:07, John Baldwin wrote:
Can you go to frame 8 and do 'l' in kgdb?
(kgdb) up 8
#8 0x80baea78 in vm_pageout () at /usr/src/sys/vm/vm_pageout.c:829
829 if (!VM_OBJECT_TRYLOCK(object) &&
(kgdb) l
824 if (!vm_pageout_page_lock(m, &next)) {
825 vm_page_unlock(m);
826 continue;
827 }
828 object = m->object;
829 if (!VM_OBJECT_TRYLOCK(object) &&
830 !vm_pageout_fallback_object_lock(m, &next)) {
831 vm_page_unlock(m);
832 VM_OBJECT_UNLOCK(object);
833 continue;
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Re: Kernel crashes after sleep: how to debug?
On Thursday, July 18, 2013 2:15:48 pm Yuri wrote:
> On 07/16/2013 08:07, John Baldwin wrote:
> > Can you go to frame 8 and do 'l' in kgdb?
>
> (kgdb) up 8
> #8 0x80baea78 in vm_pageout () at /usr/src/sys/vm/vm_pageout.c:829
> 829 if (!VM_OBJECT_TRYLOCK(object) &&
> (kgdb) l
> 824 if (!vm_pageout_page_lock(m, &next)) {
> 825 vm_page_unlock(m);
> 826 continue;
> 827 }
> 828 object = m->object;
> 829 if (!VM_OBJECT_TRYLOCK(object) &&
> 830 !vm_pageout_fallback_object_lock(m, &next)) {
> 831 vm_page_unlock(m);
> 832 VM_OBJECT_UNLOCK(object);
> 833 continue;
Hmm, so this seems to indicate you have a page on the active queue that
doesn't have an associated VM object. Can you maybe 'p *m'? Maybe some
temporary page is allocated during suspend but isn't freed appropriately?
--
John Baldwin
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Re: Kernel crashes after sleep: how to debug?
On 07/18/2013 11:42, John Baldwin wrote: Hmm, so this seems to indicate you have a page on the active queue that doesn't have an associated VM object. Can you maybe 'p *m'? Maybe some temporary page is allocated during suspend but isn't freed appropriately? Unfortunately, I get this: (kgdb) p *m No symbol "m" in current context. even though kernel was built with "makeoptions DEBUG=-g", same for other symbols there. Is there a way to identify when and by whom the page has been allocated? Yuri ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Kernel crashes after sleep: how to debug?
On Thursday, July 18, 2013 3:56:46 pm Yuri wrote: > On 07/18/2013 11:42, John Baldwin wrote: > > Hmm, so this seems to indicate you have a page on the active queue that > > doesn't have an associated VM object. Can you maybe 'p *m'? Maybe some > > temporary page is allocated during suspend but isn't freed appropriately? > > Unfortunately, I get this: > (kgdb) p *m > No symbol "m" in current context. > > even though kernel was built with "makeoptions DEBUG=-g", same for > other symbols there. > > Is there a way to identify when and by whom the page has been allocated? Are you in frame 8? -- John Baldwin ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Kernel crashes after sleep: how to debug?
On 07/18/2013 13:52, John Baldwin wrote: Are you in frame 8? Yes. Yuri ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Kernel crashes after sleep: how to debug?
On 07/18/2013 13:52, John Baldwin wrote: Are you in frame 8? For some reason the debug info is missing in frame 8, but is present in surrounding frames 7 and 9. The might be a bug in makefiles that debug flag isn't passed into sys/vm/ directory. Yuri ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
