On 17/03/14 19:44, Karl Pielorz wrote:
> --On 17 March 2014 18:17:53 +0100 Roger Pau Monné <roger....@citrix.com>
>>> Anyone know what 'urdlck' is?
>> It seems like the process is stuck while trying to acquire a rw mutex in
>> read mode. Could you obtain a backtrace of the process with gdb?
> Ok, I think I did this right - let me know if I've not...
> # gdb /usr/sbin/sshd 5325
> Attaching to program: /usr/sbin/sshd, process 5325
> warning: current_sos: Can't read pathname for load map: Bad address
> [repeated several times]
> [lots of reading symbols from - 'no debugging symbols found' output]
> [New Thread 804006400 (LWP 100184/sshd)]
> [a few reading symbols - 'no debugging symbols found' output]
> Loaded symbols for /libexec/ld-elf.so.1
> [Switching to Thread 804006400 (LWP 100184/sshd)]
> 0x00000008038eb89c in __error () from /lib/libthr.so.3
> (gdb) bt
> #0 0x00000008038eb89c in __error () from /lib/libthr.so.3
> #1 0x00000008038e921c in pthread_timedjoin_np () from /lib/libthr.so.3
> #2 0x000000080064f9a2 in _rtld_get_stack_prot () from /libexec/ld-elf.so.1
> #3 0x00000008006498c9 in r_debug_state () from /libexec/ld-elf.so.1
> #4 0x00000008006470cd in .text () from /libexec/ld-elf.so.1
> #5 0x0000000000000246 in ?? ()
> #6 0x0000000000000000 in ?? ()
>> Also a
>> kernel-space dump might be useful, could you also run procstat -k <pid>?
> procstat output is:
> # procstat -k 5334
> PID TID COMM TDNAME KSTACK
> 5334 100183 sshd - mi_switch
> sleepq_catch_signals sleepq_wait_sig _sleep umtxq_sleep do_rw_rdlock
> __umtx_op_rw_rdlock amd64_syscall Xfast_syscall
> If you can briefly tell me how to do the kernel-space dump? Do I panic
> the machine (i.e. cause a crash-dump?) somehow?
The output of vmstat -ai might also be helpful to assure that event
timers are working correctly. Also, does this VM have some
PCI-passthrough? Did you migrate it? The xl configuration file used to
create the domain would also be interesting.
Also, could you try the same workload with a pristine GENERIC kernel?
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