Comment 17 for bug 1752002

------- Comment From <email address hidden> 2019-06-24 04:52 EDT-------
Anju,

I'm trying this and seeing:
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Starting fuzzing at 2019-06-24 03:26:26
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Cannot open /sys/kernel/tracing/kprobe_events
SIGIO due to RT queue overflow
Signal from invalid fd 10 Bad file descriptor
Iteration 10000, 139369 syscalls in 25.77 s (5.407 k syscalls/s)
Open attempts: 131443 Successful: 918 Currently open: 5
ENOENT : 370
E2BIG : 11571
EBADF : 7775
EINVAL : 110627
ENOSPC : 31
EOVERFLOW : 1
EOPNOTSUPP : 150
Trinity Type (Normal 142/32892)(Sampling 11/32823)(Global 693/32727)(Random 72/33001)
Type (Hardware 268/18287)(software 318/17277)(tracepoint 60/16952)(Cache 55/16464)(cpu 151/16831)(breakpoint 17/16793)(nest_alink0_imc 1/387)(nest_alink1_imc 2/353)(nest_alink2_imc 2/455)(nest_alink3_imc 0/380)(nest_capp0_imc 0/352)(nest_capp1_imc 0/385)(nest_centaur0_imc 0/381)(nest_centaur1_imc 0/384)(nest_centaur2_imc 2/339)(nest_centaur3_imc 1/380)(nest_centaur4_imc 0/482)(nest_centaur5_imc 2/378)(nest_centaur6_imc 0/344)(nest_centaur7_imc 39/23839)
Close: 913/913 Successful
Read: 821/892 Successful
Write: 0/837 Successful
Ioctl: 276/883 Successful: (ENABLE 60/60)(DISABLE 60/60)(REFRESH 4/57)(RESET 66/66)(PERIOD 9/58)(SET_OUTPUT 5/53)(SET_FILTER 0/68)(ID 63/63)(SET_BPF 0/57)(PAUSE_OUTPUT 9/63)(QUERY_BPF 0/71)(MOD_ATTR 0/71)(#12 0/0)(#13 0/0)(#14 0/0)(>14 0/136)
Mmap: 661/1075 Successful: (MMAP 661/1075)(TRASH 119/144)(READ 127/134)(UNMAP 661/1050)(AUX 0/155)(AUX_READ 0/0)
Prctl: 900/900 Successful
Fork: 466/466 Successful
Poll: 831/893 Successful
Access: 329/918 Successful
Overflows: 1972959 Recursive: 0
SIGIOs due to RT signal queue full: 1
Iteration 20000, 140897 syscalls in 7.04 s (20.024 k syscalls/s)
Open attempts: 133151 Successful: 901 Currently open: 24
ENOENT : 402
E2BIG : 11642
EBADF : 8002
EINVAL : 112005
ENOSPC : 33
EOVERFLOW : 1
EOPNOTSUPP : 165
Trinity Type (Normal 110/33454)(Sampling 15/33233)(Global 700/33200)(Random 76/33264)
Type (Hardware 276/18590)(software 303/17115)(tracepoint 54/17217)(Cache 56/16759)(cpu 138/17185)(breakpoint 15/17011)(nest_alink0_imc 2/352)(nest_alink1_imc 3/370)(nest_alink2_imc 0/498)(nest_alink3_imc 3/382)(nest_capp0_imc 1/378)(nest_capp1_imc 1/359)(nest_centaur0_imc 1/364)(nest_centaur1_imc 0/363)(nest_centaur2_imc 1/376)(nest_centaur3_imc 2/356)(nest_centaur4_imc 1/483)(nest_centaur5_imc 1/369)(nest_centaur6_imc 0/385)(nest_centaur7_imc 43/24239)
Close: 882/882 Successful
Read: 790/870 Successful
Write: 0/857 Successful
Ioctl: 266/896 Successful: (ENABLE 63/63)(DISABLE 59/59)(REFRESH 6/74)(RESET 69/69)(PERIOD 5/68)(SET_OUTPUT 5/76)(SET_FILTER 0/68)(ID 49/49)(SET_BPF 0/67)(PAUSE_OUTPUT 10/60)(QUERY_BPF 0/64)(MOD_ATTR 0/59)(#12 0/0)(#13 0/0)(#14 0/0)(>14 0/120)
Mmap: 623/1028 Successful: (MMAP 623/1028)(TRASH 121/147)(READ 118/124)(UNMAP 618/1004)(AUX 0/135)(AUX_READ 0/0)
Prctl: 868/868 Successful
Fork: 452/452 Successful
Poll: 791/865 Successful
Access: 332/926 Successful
Overflows: 0 Recursive: 0
SIGIOs due to RT signal queue full: 0
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 0
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 1
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 2
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 3
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 4
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 5
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 6
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 7
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 8
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 9
Throttling event 1 fd 6, last_refresh=0, period=8816262, type=1 throttles 10
Stuck in a signal storm w/o forward progress; Max throttle count hit, giving up

And the end of dmesg and the (-proposed) kernel version:
[ 374.873933] perf: Dynamic interrupt throttling disabled, can hang your system!
[ 398.775635] perf: Dynamic interrupt throttling disabled, can hang your system!
[ 401.495532] perf: Dynamic interrupt throttling disabled, can hang your system!
ubuntu@ltc-wspoon5:~$ cat /proc/version
Linux version 4.15.0-51-generic (arighi@kathleen) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #55 SMP Wed Jun 5 14:15:11 UTC 2019
ubuntu@ltc-wspoon5:~$

I don't see similar on the -50 kernel. This might be unrelated, but you have ideas?