Re: nfs client kernel crash

[christos%astron.com@localhost (Christos Zoulas)]

In article <Pine.NEB.4.64.1606010908500.25929%6bone.informatik.uni-leipzig.de@localhost>,
 <6bone%6bone.informatik.uni-leipzig.de@localhost> wrote:
>hello
>
>in rare cases, under high load the nfs client crashs:
>
>0xffffffff8068630f in cpu_reboot (howto=howto@entry=260,
>     bootstr=bootstr@entry=0x0) at 
>/usr/src/sys/arch/amd64/amd64/machdep.c:671
>671                     dumpsys();
>(gdb) bt
>#0  0xffffffff8068630f in cpu_reboot (howto=howto@entry=260,
>     bootstr=bootstr@entry=0x0) at 
>/usr/src/sys/arch/amd64/amd64/machdep.c:671
>#1  0xffffffff808cbce4 in vpanic (fmt=fmt@entry=0xffffffff80dd3d3d "trap",
>     ap=ap@entry=0xfffffe8157920d18) at /usr/src/sys/kern/subr_prf.c:340
>#2  0xffffffff808cbd9f in panic (fmt=fmt@entry=0xffffffff80dd3d3d "trap")
>     at /usr/src/sys/kern/subr_prf.c:256
>#3  0xffffffff8091b001 in trap (frame=0xfffffe8157920e20)
>     at /usr/src/sys/arch/amd64/amd64/trap.c:298
>#4  0xffffffff80100fde in alltraps ()
>#5  0xffffffff8070605c in nfs_timer (arg=<optimized out>)
>     at /usr/src/sys/nfs/nfs_socket.c:770
>#6  0xffffffff80622022 in callout_softclock (v=<optimized out>)
>     at /usr/src/sys/kern/kern_timeout.c:736
>#7  0xffffffff80616bb8 in softint_execute (l=<optimized out>, s=2,
>     si=0xffff80035866a0c0) at /usr/src/sys/kern/kern_softint.c:589
>#8  softint_dispatch (pinned=<optimized out>, s=2)
>     at /usr/src/sys/kern/kern_softint.c:871
>#9  0xffffffff8011412f in Xsoftintr ()
>
>kernel: NetBSD 7.0_STABLE
>
>Any ideas what could be the problem?

See PR/40491. I don't think that the mutex there is correct. It seems
that in other places the nfs_reqq is protected with splsoftnet().

christos