Date: Mon, 15 Jun 2009 16:23:48 +0400 From: pluknet <pluknet@gmail.com> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: coretemp(4) lockups on 6-stable Message-ID: <a31046fc0906150523h75273cacw53d20e055b2c3c0d@mail.gmail.com> In-Reply-To: <a31046fc0906150429k311e74f4paed3390488b7ebe2@mail.gmail.com> References: <a31046fc0906150429k311e74f4paed3390488b7ebe2@mail.gmail.com>
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2009/6/15 pluknet <pluknet@gmail.com>:
> This is 6.4-stable from April.
>
> System locks up while in `sysctl dev.cpu` (with coretemp kldloaded).
Small follow-up:
Just one of my wild guesses is that coretemp doesn't play nice with ncpu > =
4.
A problem box is 8-way cpu. I always observe this lockup when
sched_bind(curthread, cpu) called with cpu=3D=3D4. While on another box
`sysctl dev.cpu` works good and that box have only 4 cpu cores.
>
> So as far as I understand sched_bind() binds an executing thread to
> nonexistent CPU 255.
> Same behavior on coretemp built on 6.2.
>
> db> ps
> =A0pid =A0ppid =A0pgrp =A0 uid =A0 state =A0 wmesg =A0 =A0 wchan =A0 =A0c=
md
> 34381 34380 34381 =A0 =A0 0 =A0R+ =A0 =A0 =A0CPU 255 =A0 =A0 =A0 =A0 =A0 =
=A0 sysctl
> [...]
> db> bt 34381
> Tracing pid 34381 tid 100166 td 0xc8634680
> sched_switch(c8634680,0,1) at sched_switch+0x143
> mi_switch(1,0,c86347e0,4,c0a4e510,...) at mi_switch+0x1ba
> sched_bind(c8634680,4,c856f3b0,0,c0836b3b,...) at sched_bind+0x52
> coretemp_get_temp_sysctl(c8ef56c0,c908c200,0,eebebc04,c8ef56c0,...) at
> coretemp_get_temp_sysctl+0x47
> sysctl_root(0,eebebc74,4,eebebc04) at sysctl_root+0x107
> userland_sysctl(c8634680,eebebc74,4,0,bfbfda8c,0,0,0,eebebc70,0) at
> userland_sysctl+0x112
> __sysctl(c8634680,eebebd04) at __sysctl+0x93
> syscall(3b,3b,3b,4,bfbfda8c,...) at syscall+0x2bf
> Xint0x80_syscall() at Xint0x80_syscall+0x1f
> --- syscall (202, FreeBSD ELF32, __sysctl), eip =3D 0x2812407b, esp =3D
> 0xbfbfd9fc, ebp =3D 0xbfbfda38 ---
>
> static int
> coretemp_get_temp(device_t dev)
> {
> =A0 =A0 =A0 =A0uint64_t msr;
> =A0 =A0 =A0 =A0int temp;
> =A0 =A0 =A0 =A0int cpu =3D device_get_unit(dev);
> =A0 =A0 =A0 =A0struct coretemp_softc *sc =3D device_get_softc(dev);
> =A0 =A0 =A0 =A0char stemp[16];
>
> =A0 =A0 =A0 =A0mtx_lock_spin(&sched_lock);
> =A0 =A0 =A0 =A0sched_bind(curthread, cpu);
> =A0 =A0 =A0 =A0 ^^^
> =A0 =A0 =A0 =A0mtx_unlock_spin(&sched_lock);
>
>
> --
> wbr,
> pluknet
>
--=20
wbr,
pluknet
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