i386/84384: panic during monitoring a proc (425) with truss

[Matthias Apitz]

>Number:         84384
>Category:       i386
>Synopsis:       panic during monitoring a proc (425) with truss
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jul 31 10:20:23 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Matthias Apitz
>Release:        6.0-BETA1
>Organization:
Sisis GmbH
>Environment:
$ uname -a
FreeBSD cazador.Sisis.de 6.0-BETA1 FreeBSD 6.0-BETA1 #0: Tue Jul 12 18:05:55 UTC 2005     root at x64.samsco.home:/usr/obj/usr/src/sys/GENERIC  i386
CPU: Intel(R) Pentium(R) 4 CPU 3.20GHz (3200.55-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf41  Stepping = 1
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x441d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,<b14>>
  Hyperthreading: 2 logical CPUs
real memory  = 1073152000 (1023 MB)
avail memory = 1041166336 (992 MB)

      
>Description:

panic: Assertion !(curthread->td_flags & TDF_SINTR) failed at /usr/src/sys/kern/subr_sleepqueue.c:534
cpuid = 1
KDB: enter: panic:
[thread pid 425 tid 100107]
stopped at kdb_enter+0x2b: nop

This occured while I was monitoring the pid 425, sshd, with truss:

# mount_procfs /dev/procfs /proc
# truss -f -p 425

and were trying to login with ssh to that machine, not providing the
password (just hiting ENTER 3 times); on the 2nd ssh connect without
proving the passwords, the system with the sshd / truss panics;  
>How-To-Repeat:

yes, exactly as described above the problem can be repeated;     
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: