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diagnostic assertion c->c_cpu->cc_lwp == curlwp || c->c_cpu->cc_active != c failed


I just had a panic:

panic: kernel diagnostic assertion "c->c_cpu->cc_lwp == curlwp || c->c_cpu->cc_active != c" failed: file .../kern_timeout.c, line 320

Feb 16 9.99.47/amd64

AFAICT there was lots of NFS (and network traffic) and slight CPU
usage (a couple cores). No heavy memory load or complete CPU used.

I have a core file for this panic:

(gdb) bt
#0  0xffffffff80224315 in cpu_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at /usr/src/sys/arch/amd64/amd64/machdep.c:720
#1  0xffffffff809f8029 in kern_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at /usr/src/sys/kern/kern_reboot.c:61
#2  0xffffffff80a3a039 in vpanic (fmt=0xffffffff8135e9c0 "kernel %sassertion \"%s\" failed: file \"%s\", line %d ", ap=ap@entry=0xffffbc090722bc88)
    at /usr/src/sys/kern/subr_prf.c:336
#3  0xffffffff80e803f3 in kern_assert (fmt=fmt@entry=0xffffffff8135e9c0 "kernel %sassertion \"%s\" failed: file \"%s\", line %d ")
    at /usr/src/sys/lib/libkern/kern_assert.c:51
#4  0xffffffff80a18c12 in callout_destroy (cs=cs@entry=0xffffb28a40220a88) at /usr/src/sys/kern/kern_timeout.c:321
#5  0xffffffff8073dec3 in tcp_close (tp=tp@entry=0xffffb28a40220a68) at /usr/src/sys/netinet/tcp_subr.c:1224
#6  0xffffffff80738419 in tcp_input (m=0xffffb284dcc92a88, off=20, proto=<optimized out>) at /usr/src/sys/netinet/tcp_input.c:2656
#7  0xffffffff80729849 in ip_input (m=<optimized out>) at /usr/src/sys/netinet/ip_input.c:816
#8  ipintr (arg=<optimized out>) at /usr/src/sys/netinet/ip_input.c:402
#9  0xffffffff80a08c12 in softint_execute (s=4, l=0xffffb297fe6f7480, si=0xffffbc0907220230) at /usr/src/sys/kern/kern_softint.c:578
#10 softint_dispatch (pinned=<optimized out>, s=4) at /usr/src/sys/kern/kern_softint.c:885
#11 0xffffffff8021ea4f in Xsoftintr ()


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