Date: Mon, 15 Jun 2009 21:30:40 +0400 From: pluknet <pluknet@gmail.com> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: coretemp(4) lockups on 6-stable Message-ID: <a31046fc0906151030j1d8dc2fsa66a2691a3096204@mail.gmail.com> In-Reply-To: <a31046fc0906150523h75273cacw53d20e055b2c3c0d@mail.gmail.com> References: <a31046fc0906150429k311e74f4paed3390488b7ebe2@mail.gmail.com> <a31046fc0906150523h75273cacw53d20e055b2c3c0d@mail.gmail.com>
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2009/6/15 pluknet <pluknet@gmail.com>: > 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==4. While on another box > `sysctl dev.cpu` works good and that box have only 4 cpu cores. > And yet another small one: coretemp(4) works ok under 7.0+ on same h/w. >> >> 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 >> pid ppid pgrp uid state wmesg wchan cmd >> 34381 34380 34381 0 R+ CPU 255 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 = 0x2812407b, esp = >> 0xbfbfd9fc, ebp = 0xbfbfda38 --- >> >> static int >> coretemp_get_temp(device_t dev) >> { >> uint64_t msr; >> int temp; >> int cpu = device_get_unit(dev); >> struct coretemp_softc *sc = device_get_softc(dev); >> char stemp[16]; >> >> mtx_lock_spin(&sched_lock); >> sched_bind(curthread, cpu); >> ^^^ >> mtx_unlock_spin(&sched_lock); >> >> >> -- >> wbr, >> pluknet >> > > > > -- > wbr, > pluknet > -- wbr, pluknet
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