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Date: Mon, 28 Oct 2013 16:02:03 +0100 From: Knut Petersen <Knut_Petersen@...nline.de> To: Linus Torvalds <torvalds@...ux-foundation.org>, Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Paul McKenney <paulmck@...ux.vnet.ibm.com>, Frédéric Weisbecker <fweisbec@...il.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Viresh Kumar <viresh.kumar@...aro.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> CC: Greg KH <greg@...ah.com>, linux-kernel <linux-kernel@...r.kernel.org>, cpufreq@...r.kernel.org Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown On 25.10.2013 11:02, Linus Torvalds wrote: > Adding more people, so quoting the whole email for them. > > We definitely have some module unload issues. Guys, try the following > a few times to unload modules: > > lsmod | grep ' 0 '| cut -d' ' -f1 | xargs sudo rmmod > > (a few times because unloading one module will then potentially make I do use a quite monolithic kernel with only a few modules, and one of the machines is pretty stripped down: I was unable to trigger any unusual kernel reaction within 10000 rmmod / modprobe cycles. lsmod ===== Module Size Used by ip6t_REJECT 12489 3 nf_conntrack_ipv6 13453 3 nf_defrag_ipv6 49936 1 nf_conntrack_ipv6 ip6table_raw 12565 1 ipt_REJECT 12485 3 xt_tcpudp 12531 6 xt_pkttype 12456 3 xt_LOG 17205 12 xt_limit 12570 12 iptable_raw 12561 1 xt_CT 12820 4 iptable_filter 12666 1 ip6table_mangle 12579 0 nf_conntrack_netbios_ns 12585 0 nf_conntrack_broadcast 12541 1 nf_conntrack_netbios_ns nf_conntrack_ipv4 13655 3 nf_defrag_ipv4 12649 1 nf_conntrack_ipv4 ip_tables 17713 2 iptable_raw,iptable_filter xt_conntrack 12664 6 nf_conntrack 67920 6 nf_conntrack_ipv6,xt_CT,nf_conntrack_netbios_ns,nf_conntrack_broadcast,nf_conntrack_ipv4,xt_conntrack ip6table_filter 12670 1 ip6_tables 17740 3 ip6table_raw,ip6table_mangle,ip6table_filter x_tables 21937 15 ip6t_REJECT,ip6table_raw,ipt_REJECT,xt_tcpudp,xt_pkttype,xt_LOG,xt_limit,iptable_raw,xt_CT,iptable_filter,ip6table_mangle,ip_tables,xt_conntrack,ip6table_filter,ip6_tables snd_rme96 24387 0 snd_hda_intel 34073 0 snd_hda_codec_realtek 41826 1 snd_hda_codec 129150 2 snd_hda_intel,snd_hda_codec_realtek snd_pcm 73096 3 snd_rme96,snd_hda_intel,snd_hda_codec snd_timer 24441 1 snd_pcm snd_page_alloc 14230 2 snd_hda_intel,snd_pcm snd 58328 6 snd_rme96,snd_hda_intel,snd_hda_codec_realtek,snd_hda_codec,snd_pcm,snd_timer soundcore 14599 1 snd binfmt_misc 13111 1 ipv6 272895 24 ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6,ip6table_mangle > other modules unloadable). > > On my machine, I can trigger this, for example: > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 3217 at fs/sysfs/file.c:498 sysfs_attr_ns+0x91/0xa0() > sysfs: kobject (null) without dirent > Modules linked in: fuse nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT xt_$ > CPU: 0 PID: 3217 Comm: rmmod Not tainted 3.12.0-rc6-00284-ge6036c0b8896 #19 > Hardware name: Sony Corporation SVP11213CXB/VAIO, BIOS R0270V7 05/17/2013 > 0000000000000009 ffff8800aca35df8 ffffffff8160aab5 ffff8800aca35e40 > ffff8800aca35e30 ffffffff810514b8 ffffffffa013f080 ffff8801194a6040 > 0000000000000800 0000000000000000 0000000000c5b3e0 ffff8800aca35e90 > Call Trace: > [<ffffffff8160aab5>] dump_stack+0x45/0x56 > [<ffffffff810514b8>] warn_slowpath_common+0x78/0xa0 > [<ffffffff81051527>] warn_slowpath_fmt+0x47/0x50 > [<ffffffff810b5960>] ? module_refcount+0xb0/0xb0 > [<ffffffff811e5c61>] sysfs_attr_ns+0x91/0xa0 > [<ffffffff811e5d2a>] sysfs_remove_file+0x1a/0x50 > [<ffffffff814c88a3>] cpufreq_sysfs_remove_file+0x13/0x30 > [<ffffffffa013d350>] acpi_cpufreq_exit+0x2e/0xcde [acpi_cpufreq] > [<ffffffff810b7d1d>] SyS_delete_module+0x15d/0x2c0 > [<ffffffff81002929>] ? do_notify_resume+0x59/0x90 > [<ffffffff81618f62>] system_call_fastpath+0x16/0x1b > ---[ end trace f887112caaa5c4ab ]--- > > so at least we have a cpufreq/sysfs interaction bug. There may be others. > > This particular cpufreq issue may be triggered by the fact that > acpi-cpufreq isn't actually in use (pstate is). Or it might be some > generic cpufreq/sysfs bug. Rafael, Greg, ideas? > > I don't see that this particular one would be the one that causes the > timer issues, but it's an example of the fact that module unload tends > to be special and not necessarily well tested. > > Linus > > On Fri, Oct 25, 2013 at 9:38 AM, Linus Torvalds > <torvalds@...ux-foundation.org> wrote: >> Hmm.. I just got a run_timer_softirq oops on my own laptop, slightly >> different. That was not during shutdown, although there was a "yum >> upgrade" finishing when that happened, so it's quite likely that there >> was a service shutdown (and then restart). >> >> I think it's related. But my oops has almost no information: the IP >> that was jumped to was bogus, and the callchain is just CPU idle >> followed by the softirq -> run_timers_softirq handling, so there's no >> real way to see *what* triggered it. >> >> The bad rip was ffffffffa051e250, which is not a valid code address. >> It *might* be a module address, though. So this might be triggered by >> rmmod on some module that doesn't remove all its timers... >> >> Ideas? >> >> Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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