Bug 216905 - process hung in STOP, CPU 100% system, thread in PCPU_GET(cpuid)
Summary: process hung in STOP, CPU 100% system, thread in PCPU_GET(cpuid)
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 10.3-RELEASE
Hardware: amd64 Any
: --- Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-02-08 08:13 UTC by Erokhin Konstantin
Modified: 2017-02-09 06:04 UTC (History)
0 users

See Also:

Attachments
kgdb inspect proc, threads (19.60 KB, text/plain)
2017-02-08 08:13 UTC, Erokhin Konstantin 		no flags Details
procstat (27.15 KB, text/plain)
2017-02-08 08:29 UTC, Erokhin Konstantin 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Erokhin Konstantin 2017-02-08 08:13:04 UTC 
Created attachment 179745 [details]
kgdb inspect proc, threads

10.3-RELEASE-p7, our jailed process named `udpd` hangs in STOP state.
According to top it uses 100% CPU:
  PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
25041  10001        2  20    0 30061M 21536M STOP   26 2783.5 100.00% udpd

CPU id 26 is 100% system time.
gdb/lldb/truss cant attach to process.

Process has two threads^
ps HO wchan,nwchan,ppid -p 25041
  PID WCHAN NWCHAN PPID TT  STAT         TIME COMMAND
25041 -     -         1  -  RJ   165992:29.29 bin/udpd --config=etc/transport.cfg --subcfg=etc/transport --daemonize --pid-file=/usr/local/ksn/var/ksn.udpd.pid --trace-file=log/udpd_trace.txt --trace-level=500
25041 -     -         1  -  TJ        1:36.89 bin/udpd --config=etc/transport.cfg --subcfg=etc/transport --daemonize --pid-file=/usr/local/ksn/var/ksn.udpd.pid --trace-file=log/udpd_trace.txt --trace-level=500

Collected some info about threand and proc via kgdb.
Comment 1 Erokhin Konstantin 2017-02-08 08:29:50 UTC 
Created attachment 179746 [details]
procstat