[Bug 201543] www/chromium: chrome processes stuck at 100% cpu

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201543

--- Comment #5 from pete at nomadlogic.org ---
(In reply to pete from comment #4)
I have built a kernel with DDB support enabled.  Here is the output from ddb
invoked once chromium hit's the %100 CPU utilization bug:

db> show proc 1061
Process 1061 (chrome) at 0xfffff8000303a000:
 state: NORMAL
 uid: 1001  gids: 1001, 0
 parent: pid 1059 at 0xfffff8000303a4c0
 ABI: FreeBSD ELF64
 arguments: chrome:
 threads: 21
100630                   S       uwait    0xfffff8000e33eb80 chrome
100620                   S       uwait    0xfffff800a856b500 chrome
100576                   S       uwait    0xfffff801209f7480 chrome
100575                   S       uwait    0xfffff800afb82600 chrome
100573                   S       uwait    0xfffff8012065d480 chrome
100572                   S       uwait    0xfffff801209f6380 chrome
100571                   S       uwait    0xfffff800affae580 chrome
100564                   S       uwait    0xfffff800a83ffb80 chrome
100563                   S       uwait    0xfffff80120afb380 chrome
100552                   S       uwait    0xfffff800afbf6200 chrome
100528                   S       uwait    0xfffff80002fea400 chrome
100527                   S       uwait    0xfffff80120a57a80 chrome
100524                   S       uwait    0xfffff801209dab80 chrome
100521                   S       uwait    0xfffff80003111e80 chrome
100520                   S       uwait    0xfffff80120524c00 chrome
100515                   Run     CPU 1                       chrome
100514                   S       uwait    0xfffff80003d29400 chrome
100513                   S       uwait    0xfffff800aff1f700 chrome
100512                   S       uwait    0xfffff80003112a00 chrome
100511                   S       piperd   0xfffff8005036a2e8 chrome
100308                   S       uwait    0xfffff800a82c8100 chrome

db> tr 1061         
Tracing pid 1061 tid 100630 td 0xfffff8000e856490
sched_switch() at sched_switch+0x2b3/frame 0xfffffe0000274850
mi_switch() at mi_switch+0xe1/frame 0xfffffe0000274890
sleepq_catch_signals() at sleepq_catch_signals+0xab/frame 0xfffffe0000274910
sleepq_wait_sig() at sleepq_wait_sig+0xf/frame 0xfffffe0000274940
_sleep() at _sleep+0x27d/frame 0xfffffe00002749c0
umtxq_sleep() at umtxq_sleep+0x125/frame 0xfffffe0000274a20
do_wait() at do_wait+0x329/frame 0xfffffe0000274aa0
__umtx_op_wait_uint_private() at __umtx_op_wait_uint_private+0x83/frame
0xfffffe0000274ae0
amd64_syscall() at amd64_syscall+0x351/frame 0xfffffe0000274bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0000274bf0
--- syscall (454, FreeBSD ELF64, sys__umtx_op), rip = 0x8098038cc, rsp =
0x7ffffbbdde88, rbp = 0x7ffffbbddeb0 ---

db> show thread 1061
KDB: reentering
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00003320b0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe0000332160
kdb_reenter() at kdb_reenter+0x33/frame 0xfffffe0000332170
trap() at trap+0x54/frame 0xfffffe0000332380
calltrap() at calltrap+0x8/frame 0xfffffe0000332380
--- trap 0xc, rip = 0xffffffff8034cc52, rsp = 0xfffffe0000332440, rbp =
0xfffffe0000332470 ---
db_show_thread() at db_show_thread+0x22/frame 0xfffffe0000332470
db_command() at db_command+0x26d/frame 0xfffffe0000332540
db_command_loop() at db_command_loop+0x64/frame 0xfffffe0000332550
db_trap() at db_trap+0xe0/frame 0xfffffe00003325e0
kdb_trap() at kdb_trap+0x129/frame 0xfffffe0000332630
trap() at trap+0x463/frame 0xfffffe0000332840
calltrap() at calltrap+0x8/frame 0xfffffe0000332840
--- trap 0x3, rip = 0xffffffff80970991, rsp = 0xfffffe0000332900, rbp =
0xfffffe0000332930 ---
kdb_sysctl_enter() at kdb_sysctl_enter+0x91/frame 0xfffffe0000332930
sysctl_root() at sysctl_root+0x24e/frame 0xfffffe0000332980
userland_sysctl() at userland_sysctl+0x1d8/frame 0xfffffe0000332a30
sys___sysctl() at sys___sysctl+0x74/frame 0xfffffe0000332ae0
amd64_syscall() at amd64_syscall+0x351/frame 0xfffffe0000332bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0000332bf0
--- syscall (202, FreeBSD ELF64, sys___sysctl), rip = 0x80096529a, rsp =
0x7fffffffd9f8, rbp = 0x7fffffffda30 ---



I will leave this system in ddb and can run additional commands as needed.

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