Date: Wed, 19 Aug 2020 17:40:59 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 248757] panic: waiting too long for pmc to be free Message-ID: <bug-248757-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248757 Bug ID: 248757 Summary: panic: waiting too long for pmc to be free Product: Base System Version: CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: luporl@FreeBSD.org When executing the commands below, sometimes the system panics: stress -c 1 -t 10 & pmcstat -t stress -p mem_load_retired.l2_miss sleep 3 panic: [pmc,2749] (ri17, rc1) waiting too long for pmc to be free=20=20=20= =20=20=20=20=20=20=20=20=20=20=20 cpuid =3D 2 time =3D 1597858367 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe005fc9a= 760=20 vpanic() at vpanic+0x182/frame 0xfffffe005fc9a7b0=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 panic() at panic+0x43/frame 0xfffffe005fc9a810=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 pmc_wait_for_pmc_idle() at pmc_wait_for_pmc_idle+0xa2/frame 0xfffffe005fc9a= 840=20 pmc_release_pmc_descriptor() at pmc_release_pmc_descriptor+0x204/frame 0xfffffe0 pmc_syscall_handler() at pmc_syscall_handler+0x4be/frame 0xfffffe005fc9a9d0= =20=20=20=20 amd64_syscall() at amd64_syscall+0x140/frame 0xfffffe005fc9aaf0=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20 fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe005fc9aaf0= =20=20=20=20=20 --- syscall (0, FreeBSD ELF64, nosys), rip =3D 0x800a8a96a, rsp =3D 0x7fffffffe368,- KDB: enter: panic [ thread pid 1852 tid 100126 ] Stopped at kdb_enter+0x37: movq $0,0x10bc706(%rip)=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 db> I'm running -CURRENT on an amd64 VM (qemu with kvm). I've performed several different tests with pmcstat and stress and got no panics. --=20 You are receiving this mail because: You are the assignee for the bug.=
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