Date: Fri, 11 May 2018 00:29:30 -0700 From: Matthew Macy <mmacy@freebsd.org> To: Peter Holm <peter@holm.cc> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r333480 - head/sys/kern Message-ID: <CAPrugNoU8H3B5GLEnxuEO3YbyMi4ZhJxm=oknO-x9_Q-PGPzQQ@mail.gmail.com> In-Reply-To: <20180511071854.GA35451@x2.osted.lan> References: <201805110454.w4B4sDpx067946@repo.freebsd.org> <20180511071854.GA35451@x2.osted.lan>
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Yes. Can you give me the line number for epoch_call_task+0x7b On Fri, May 11, 2018 at 12:18 AM, Peter Holm <peter@holm.cc> wrote: > On Fri, May 11, 2018 at 04:54:13AM +0000, Matt Macy wrote: >> Author: mmacy >> Date: Fri May 11 04:54:12 2018 >> New Revision: 333480 >> URL: https://svnweb.freebsd.org/changeset/base/333480 >> >> Log: >> epoch(9): fix priority handling, make callback lists pcpu, and other fixes >> >> - Lend priority to preempted threads in epoch_wait to handle the case >> in which we've had priority lent to us. Previously we borrowed the >> priority of the lowest priority preempted thread. (pointed out by mjg@) >> >> - Don't attempt allocate memory per-domain on powerpc, we don't currently >> handle empty sockets (as is the case on jhibbits Talos' board). >> >> - Handle deferred callbacks as pcpu lists and poll the lists periodically. >> Currently the interval is 1/hz. >> >> - Drop the thread lock when adaptive spinning. Holding the lock starves >> other threads and can even lead to lockups. >> >> - Keep a generation count pcpu so that we don't keep spining if a thread >> has left and re-entered an epoch section. >> >> - Actually removed the callback from the callback list so that we don't >> double free. Sigh ... >> >> Approved by: sbruno@ >> >> Modified: >> head/sys/kern/subr_epoch.c >> >> Modified: head/sys/kern/subr_epoch.c >> ============================================================================== >> --- head/sys/kern/subr_epoch.c Fri May 11 04:47:05 2018 (r333479) > > Could this be yours? > > cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed > WARNING: WITNESS option enabled, expect reduced performance. > WARNING: DIAGNOSTIC option enabled, expect reduced performance. > Trying to mount root from ufs:/dev/da0p2 [rw]... > Expensive timeout(9) function: 0xffffffff809f20d0(0xffffffff81af5140) 0.006730830 s > uhub1: 4 ports with 4 removable, self powered > kernel trap 12 with interrupts disabled > > > Fatal trap 12: page fault while in kernel mode > cpuid = 12; apic id = 20 > fault virtual address = 0x100 > fault code = supervisor read data, page not present > instruction pointer = 0x20:0xffffffff80bb68db > stack pointer = 0x0:0xfffffe00004e19b0 > frame pointer = 0x0:0xfffffe00004e19f0 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags = resume, IOPL = 0 > current process = 0 (config_0) > [ thread pid 0 tid 100081 ] > Stopped at epoch_call_task+0x7b: movq ll+0xdf(%rax),%rcx > db> show registers > cs 0x20 > ds 0x3b ll+0x1a > es 0x3b ll+0x1a > fs 0x13 > gs 0x1b > ss 0 > rax 0 > rcx 0x858 ll+0x837 > rdx 0xffffffff812f6968 > rbx 0xc > rsp 0xfffffe00004e19b0 > rbp 0xfffffe00004e19f0 > rsi 0x14 > rdi 0 > r8 0xfffff800038f3000 > r9 0xffffffff81ff1620 vmspace0+0x130 > r10 0xfffff800038f3000 > r11 0x40 ll+0x1f > r12 0xfffffe00004e19b8 > r13 0xc > r14 0xfffff8001f0ed400 > r15 0xfffff800038f3000 > rip 0xffffffff80bb68db epoch_call_task+0x7b > rflags 0x10086 > epoch_call_task+0x7b: movq ll+0xdf(%rax),%rcx > db> bt > Tracing pid 0 tid 100081 td 0xfffff800038f3000 > epoch_call_task() at epoch_call_task+0x7b/frame 0xfffffe00004e19f0 > gtaskqueue_run_locked() at gtaskqueue_run_locked+0x139/frame 0xfffffe00004e1a40 > gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0x88/frame 0xfffffe00004e1a70 > fork_exit() at fork_exit+0x84/frame 0xfffffe00004e1ab0 > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00004e1ab0 > --- trap 0, rip = 0, rsp = 0, rbp = 0 --- > db> x/s version > version: FreeBSD 12.0-CURRENT #0 r333481: Fri May 11 09:08:40 CEST 2018\012 pho@t2.osted.lan:/usr/obj/usr/src/amd64.amd64/sys/PHO\012 > db> > > - Peter
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