5.2R SMP kernel crashes when paging on swap
Carlos Eduardo Smanioto
smanioto at netsite.com.br
Thu Jan 22 07:58:40 PST 2004
I have the same problem in FreeBSD 4.9, 5.1 and 5.2!!!
[]'s
Carlos
----- Original Message -----
From: "Dong Lin" <dong at research.bell-labs.com>
To: <freebsd-smp at freebsd.org>
Sent: Tuesday, January 20, 2004 6:57 PM
Subject: 5.2R SMP kernel crashes when paging on swap
>
> Does anyone have any suggestions on how to debug the following
> vm_pager problem in a SMP kernel? Thanks in advance.
>
> The kernel crashes when vm_pageout_scan kicks. I have a hard time
> locating the offending line because there is no panic. The machine
> just goes blank and reboots.
>
> If I add DELAY() at the end of vm_pageout_scan (after Giant unlock),
> it does not crash but causes the following warning on the console:
>
> lock order reversal:
> 1st vm object(vm object) @ vm/swap_pager.c:1325
> 2nd swap_pager swhash (swap_pager swhash) @ vm/swap_pager.c:1840
> 3rd vm object (vm object) @ vm/uma_core.c:873
> Stack backtrace:
> backtrace()
> witness_lock()
> _mtx_lock_flags()
> obj_alloc()
> slab_zalloc()
> uma_zone_slab()
> uma_zalloc_internal()
> uma_zalloc_arg()
> swp_pager_meta_build()
> swap_pager_putpages()
> default_pager_putpages()
> vm_pageout_flush()
> vm_pageout_clean()
> vm_pageout_scan()
> vm_pageout()
> fork_exit()
> fork_trampoline()
>
> This dual processor machine works fine with a non-SMP kernel. The SMP
> kernel works on a uniprocessor machine as well.
>
> my SMP kernel:
> GENERIC with BOOTP and BOOTP_NFSROOT added to run diskless.
>
> my machine configuration:
> all fs are mounted via md or NFS. The only local storage is a swap
> disk.
>
> nfsserver:/disk4/diskless_root 69481814 61293081 2630188 96% /
> devfs 1 1 0 100% /dev
> /dev/md0 7406 1720 5094 25% /etc
> procfs 4 4 0 100% /proc
> /dev/md1 31470 242 28712 1% /var
> nfsserver:/usr 2804906 1406602 1173912 55% /usr
>
> % swapinfo
> Device 1K-blocks Used Avail Capacity
> /dev/ad0s3b 528144 4600 523544 1%
>
> MPTable: <INTEL Kitty Hawk >
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel Pentium III (864.46-MHz 686-class CPU)
> Origin = "GenuineIntel" Id = 0x686 Stepping = 6
>
Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,
CM
> OV,PAT,PSE36,MMX,FXSR,SSE>
> real memory = 134041600 (127 MB)
> avail memory = 120590336 (115 MB)
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> cpu0 (BSP): APIC ID: 1
> cpu1 (AP): APIC ID: 0
> ioapic0: Assuming intbase of 0
> ioapic0 <Version 2.0> irqs 0-23 on motherboard
> Pentium Pro MTRR support enabled
> _______________________________________________
> freebsd-smp at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-smp
> To unsubscribe, send any mail to "freebsd-smp-unsubscribe at freebsd.org"
More information about the freebsd-smp
mailing list