Your message dated Fri, 15 Feb 2013 11:47:10 +0000 with message-id <E1U6Jl0-0003MX-Bb@franck.debian.org> and subject line Bug#698382: fixed in linux-2.6 2.6.32-48 has caused the Debian Bug report #698382, regarding s390/time: fix sched_clock() overflow to be marked as done. This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact owner@bugs.debian.org immediately.) -- 698382: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=698382 Debian Bug Tracking System Contact owner@bugs.debian.org with problems
--- Begin Message ---
- To: submit@bugs.debian.org
- Subject: s390/time: fix sched_clock() overflow
- From: Philipp Kern <pkern@debian.org>
- Date: Thu, 17 Jan 2013 20:05:03 +0100
- Message-id: <20130117190503.GA10479@simplex.0x539.de>
Source: linux-2.6 Version: 2.6.32-46 Hi, this should be backported/included into our kernel when/if it's accepted upstream. 2.6.32 and 3.2.0 are both affected. (So given the source package change I guess this bug would need to be cloned for the latter, but I'll leave that up to you.) Kind regards Philipp Kern ----- Forwarded message from Heiko Carstens <heiko.carstens@de.ibm.com> ----- Date: Tue, 15 Jan 2013 10:05:03 +0100 From: Heiko Carstens <heiko.carstens@de.ibm.com> To: LINUX-390@VM.MARIST.EDU Subject: Re: Twin penguins prospered for 417 days, then died User-Agent: Mutt/1.5.21 (2010-09-15) Message-ID: <20130115090503.GB3227@osiris> On Mon, Jan 14, 2013 at 08:36:58PM +0100, Philipp Kern wrote: > On Mon, Jan 14, 2013 at 01:11:34PM +0100, Heiko Carstens wrote: > > That patch is for x86 only and won't fix your problem. However we do have a > > similar bug in the s390 kernel code. The only difference is that it will > > indeed trigger after 417 days instead of 208 days. > > > > The reason is that we calculate with differences of the TOD clock register. > > The TOD clock wraps after appr. 143 years. So far no problem... > > > > However when converting a difference to nanoseconds we must divide the value > > by 4.096. Without floating point arithmetics in the kernel we do that by > > multiplying with 125 and afterwards dividing by 512... and there you can > > see when the overflow happens: > > > > 143 years / 125 = 1.114 years. And 365 days * 1.114 = 417.56 days. > > > > So, that's when we hit the overflow. > > > > We are working on a fix! > > > > Thanks again for reporting! > > I'd be cool if you could followup here with the patch when it's available. For > the sake of Debian and others… The patch below is what we came up with. The patch is against current kernel version 3.8-rc3+, however I added the "Cc: stable@kernel.org" tag, so it should be backported for all maintained stable kernels at kernel.org. From bf01d5d698b7d4a2ec42d55af19fb6d5c0bc0fe0 Mon Sep 17 00:00:00 2001 From: Heiko Carstens <heiko.carstens@de.ibm.com> Date: Mon, 14 Jan 2013 16:55:55 +0100 Subject: [PATCH] s390/time: fix sched_clock() overflow Converting a 64 Bit TOD format value to nanoseconds means that the value must be divided by 4.096. In order to achieve that we multiply with 125 and divide by 512. When used within sched_clock() this triggers an overflow after appr. 417 days. Resulting in a sched_clock() return value that is much smaller than previously and therefore may cause all sort of weird things in subsystems that rely on a monotonic sched_clock() behaviour. To fix this implement a tod_to_ns() helper function which converts TOD values without overflow and call this function from both places that open coded the conversion: sched_clock() and kvm_s390_handle_wait(). Cc: stable@kernel.org Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> --- arch/s390/include/asm/timex.h | 28 ++++++++++++++++++++++++++++ arch/s390/kernel/time.c | 2 +- arch/s390/kvm/interrupt.c | 2 +- 3 files changed, 30 insertions(+), 2 deletions(-) diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h index fba4d66..4c060bb 100644 --- a/arch/s390/include/asm/timex.h +++ b/arch/s390/include/asm/timex.h @@ -128,4 +128,32 @@ static inline unsigned long long get_clock_monotonic(void) return get_clock_xt() - sched_clock_base_cc; } +/** + * tod_to_ns - convert a TOD format value to nanoseconds + * @todval: to be converted TOD format value + * Returns: number of nanoseconds that correspond to the TOD format value + * + * Converting a 64 Bit TOD format value to nanoseconds means that the value + * must be divided by 4.096. In order to achieve that we multiply with 125 + * and divide by 512: + * + * ns = (todval * 125) >> 9; + * + * In order to avoid an overflow with the multiplication we can rewrite this. + * With a split todval == 2^32 * th + tl (th upper 32 bits, tl lower 32 bits) + * we end up with + * + * ns = ((2^32 * th + tl) * 125 ) >> 9; + * -> ns = (2^23 * th * 125) + ((tl * 125) >> 9); + * + */ +static inline unsigned long long tod_to_ns(unsigned long long todval) +{ + unsigned long long ns; + + ns = ((todval >> 32) << 23) * 125; + ns += ((todval & 0xffffffff) * 125) >> 9; + return ns; +} + #endif diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index aff0e35..a5f4f5a 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -63,7 +63,7 @@ static DEFINE_PER_CPU(struct clock_event_device, comparators); */ unsigned long long notrace __kprobes sched_clock(void) { - return (get_clock_monotonic() * 125) >> 9; + return tod_to_ns(get_clock_monotonic()); } /* diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index c30615e..82c481d 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -408,7 +408,7 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) return 0; } - sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9; + sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime); -- 1.7.12.4 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to LISTSERV@VM.MARIST.EDU with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ----- End forwarded message -----Attachment: signature.asc
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--- Begin Message ---
- To: 698382-close@bugs.debian.org
- Subject: Bug#698382: fixed in linux-2.6 2.6.32-48
- From: Ben Hutchings <ben@decadent.org.uk>
- Date: Fri, 15 Feb 2013 11:47:10 +0000
- Message-id: <E1U6Jl0-0003MX-Bb@franck.debian.org>
Source: linux-2.6 Source-Version: 2.6.32-48 We believe that the bug you reported is fixed in the latest version of linux-2.6, which is due to be installed in the Debian FTP archive. A summary of the changes between this version and the previous one is attached. Thank you for reporting the bug, which will now be closed. If you have further comments please address them to 698382@bugs.debian.org, and the maintainer will reopen the bug report if appropriate. Debian distribution maintenance software pp. Ben Hutchings <ben@decadent.org.uk> (supplier of updated linux-2.6 package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing ftpmaster@debian.org) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Thu, 14 Feb 2013 14:11:58 +0000 Source: linux-2.6 Binary: linux-tools-2.6.32 linux-source-2.6.32 linux-doc-2.6.32 linux-manual-2.6.32 linux-patch-debian-2.6.32 firmware-linux-free linux-support-2.6.32-5 linux-base linux-libc-dev linux-headers-2.6.32-5-all linux-headers-2.6.32-5-all-alpha linux-headers-2.6.32-5-common linux-image-2.6.32-5-alpha-generic linux-headers-2.6.32-5-alpha-generic linux-image-2.6.32-5-alpha-smp linux-headers-2.6.32-5-alpha-smp linux-image-2.6.32-5-alpha-legacy linux-headers-2.6.32-5-alpha-legacy linux-headers-2.6.32-5-all-amd64 linux-image-2.6.32-5-amd64 linux-headers-2.6.32-5-amd64 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linux-headers-2.6.32-5-all-sparc64 Architecture: all i386 source Version: 2.6.32-48 Distribution: stable Urgency: low Maintainer: Debian Kernel Team <debian-kernel@lists.debian.org> Changed-By: Ben Hutchings <ben@decadent.org.uk> Closes: 698382 699112 700486 Description: firmware-linux-free - Binary firmware for various drivers in the Linux kernel linux-base - Linux image base package linux-doc-2.6.32 - Linux kernel specific documentation for version 2.6.32 linux-headers-2.6.32-5-486 - Header files for Linux 2.6.32-5-486 linux-headers-2.6.32-5-4kc-malta - Header files for Linux 2.6.32-5-4kc-malta linux-headers-2.6.32-5-5kc-malta - Header files for Linux 2.6.32-5-5kc-malta linux-headers-2.6.32-5-686-bigmem - Header files for Linux 2.6.32-5-686-bigmem linux-headers-2.6.32-5-686 - Header files for Linux 2.6.32-5-686 linux-headers-2.6.32-5-all - All header files for Linux 2.6.32 (meta-package) linux-headers-2.6.32-5-all-alpha - All header files for Linux 2.6.32 (meta-package) 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linux-headers-2.6.32-5-xen-686 - Header files for Linux 2.6.32-5-xen-686 linux-headers-2.6.32-5-xen-amd64 - Header files for Linux 2.6.32-5-xen-amd64 linux-image-2.6.32-5-486 - Linux 2.6.32 for old PCs linux-image-2.6.32-5-4kc-malta - Linux 2.6.32 for MIPS Malta linux-image-2.6.32-5-5kc-malta - Linux 2.6.32 for MIPS Malta (64-bit) linux-image-2.6.32-5-686-bigmem-dbg - Debugging infos for Linux 2.6.32-5-686-bigmem linux-image-2.6.32-5-686-bigmem - Linux 2.6.32 for PCs with 4GB+ RAM linux-image-2.6.32-5-686 - Linux 2.6.32 for modern PCs linux-image-2.6.32-5-alpha-generic - Linux 2.6.32 for Alpha linux-image-2.6.32-5-alpha-legacy - Linux 2.6.32 for Alpha Legacy linux-image-2.6.32-5-alpha-smp - Linux 2.6.32 for Alpha SMP linux-image-2.6.32-5-amd64-dbg - Debugging infos for Linux 2.6.32-5-amd64 linux-image-2.6.32-5-amd64 - Linux 2.6.32 for 64-bit PCs linux-image-2.6.32-5-amiga - Linux 2.6.32 for Amiga linux-image-2.6.32-5-atari - Linux 2.6.32 for Atari linux-image-2.6.32-5-bvme6000 - Linux 2.6.32 for BVM BVME4000 and BVME6000 linux-image-2.6.32-5-iop32x - Linux 2.6.32 for IOP32x linux-image-2.6.32-5-itanium - Linux 2.6.32 for Itanium linux-image-2.6.32-5-ixp4xx - Linux 2.6.32 for IXP4xx linux-image-2.6.32-5-kirkwood - Linux 2.6.32 for Marvell Kirkwood linux-image-2.6.32-5-mac - Linux 2.6.32 for Macintosh linux-image-2.6.32-5-mckinley - Linux 2.6.32 for Itanium II linux-image-2.6.32-5-mvme147 - Linux 2.6.32 for Motorola MVME147 linux-image-2.6.32-5-mvme16x - Linux 2.6.32 for Motorola MVME162/6/7, MVME172/7 linux-image-2.6.32-5-openvz-686-dbg - Debugging infos for Linux 2.6.32-5-openvz-686 linux-image-2.6.32-5-openvz-686 - Linux 2.6.32 for modern PCs, OpenVZ support linux-image-2.6.32-5-openvz-amd64-dbg - Debugging infos for Linux 2.6.32-5-openvz-amd64 linux-image-2.6.32-5-openvz-amd64 - Linux 2.6.32 for 64-bit PCs, OpenVZ support linux-image-2.6.32-5-orion5x - Linux 2.6.32 for Marvell Orion linux-image-2.6.32-5-parisc64 - Linux 2.6.32 for 64-bit PA-RISC linux-image-2.6.32-5-parisc64-smp - Linux 2.6.32 for multiprocessor 64-bit PA-RISC linux-image-2.6.32-5-parisc - Linux 2.6.32 for 32-bit PA-RISC linux-image-2.6.32-5-parisc-smp - Linux 2.6.32 for multiprocessor 32-bit PA-RISC linux-image-2.6.32-5-powerpc64 - Linux 2.6.32 for 64-bit PowerPC linux-image-2.6.32-5-powerpc - Linux 2.6.32 for uniprocessor 32-bit PowerPC linux-image-2.6.32-5-powerpc-smp - Linux 2.6.32 for multiprocessor 32-bit PowerPC linux-image-2.6.32-5-r4k-ip22 - Linux 2.6.32 for SGI IP22 linux-image-2.6.32-5-r5k-cobalt - Linux 2.6.32 for Cobalt linux-image-2.6.32-5-r5k-ip32 - Linux 2.6.32 for SGI IP32 linux-image-2.6.32-5-s390x - Linux 2.6.32 for IBM zSeries linux-image-2.6.32-5-s390x-tape - Linux 2.6.32 for IBM zSeries, IPL from tape linux-image-2.6.32-5-sb1a-bcm91480b - Linux 2.6.32 for BCM91480B linux-image-2.6.32-5-sb1-bcm91250a - Linux 2.6.32 for BCM91250A linux-image-2.6.32-5-sh7751r - Linux 2.6.32 for sh7751r linux-image-2.6.32-5-sh7785lcr - Linux 2.6.32 for sh7785lcr linux-image-2.6.32-5-sparc64 - Linux 2.6.32 for uniprocessor 64-bit UltraSPARC linux-image-2.6.32-5-sparc64-smp - Linux 2.6.32 for multiprocessor 64-bit UltraSPARC linux-image-2.6.32-5-versatile - Linux 2.6.32 for Versatile linux-image-2.6.32-5-vserver-686-bigmem-dbg - Debugging infos for Linux 2.6.32-5-vserver-686-bigmem linux-image-2.6.32-5-vserver-686-bigmem - Linux 2.6.32 for PCs with 4GB+ RAM, Linux-VServer support linux-image-2.6.32-5-vserver-686 - Linux 2.6.32 for modern PCs, Linux-VServer support linux-image-2.6.32-5-vserver-amd64-dbg - Debugging infos for Linux 2.6.32-5-vserver-amd64 linux-image-2.6.32-5-vserver-amd64 - Linux 2.6.32 for 64-bit PCs, Linux-VServer support linux-image-2.6.32-5-vserver-itanium - Linux 2.6.32 for Itanium, Linux-VServer support linux-image-2.6.32-5-vserver-mckinley - Linux 2.6.32 for Itanium II, Linux-VServer support linux-image-2.6.32-5-vserver-powerpc64 - Linux 2.6.32 for 64-bit PowerPC, Linux-VServer support linux-image-2.6.32-5-vserver-powerpc - Linux 2.6.32 for uniprocessor 32-bit PowerPC, Linux-VServer suppo linux-image-2.6.32-5-vserver-s390x - Linux 2.6.32 for IBM zSeries, Linux-VServer support linux-image-2.6.32-5-vserver-sparc64 - Linux 2.6.32 for uniprocessor 64-bit UltraSPARC, Linux-VServer su linux-image-2.6.32-5-xen-686-dbg - Debugging infos for Linux 2.6.32-5-xen-686 linux-image-2.6.32-5-xen-686 - Linux 2.6.32 for modern PCs, Xen dom0 support linux-image-2.6.32-5-xen-amd64-dbg - Debugging infos for Linux 2.6.32-5-xen-amd64 linux-image-2.6.32-5-xen-amd64 - Linux 2.6.32 for 64-bit PCs, Xen dom0 support linux-libc-dev - Linux support headers for userspace development linux-manual-2.6.32 - Linux kernel API manual pages for version 2.6.32 linux-patch-debian-2.6.32 - Debian patches to version 2.6.32 of the Linux kernel linux-source-2.6.32 - Linux kernel source for version 2.6.32 with Debian patches linux-support-2.6.32-5 - Support files for Linux 2.6.32 linux-tools-2.6.32 - Performance analysis tools for Linux 2.6.32 xen-linux-system-2.6.32-5-xen-686 - Xen system with Linux 2.6.32 on modern PCs (meta-package) xen-linux-system-2.6.32-5-xen-amd64 - Xen system with Linux 2.6.32 on 64-bit PCs (meta-package) Changes: linux-2.6 (2.6.32-48) stable; urgency=low . * [s390] s390/time: fix sched_clock() overflow (Closes: #698382) * Revert "time: Avoid making adjustments if we haven't accumulated anything" (Closes: #699112, regression in 2.6.32.60) * exec: Fix accounting of execv*() memory after vfork() (Closes: #700486) * r8169: Fix bugs that can cause an interface to hang (possible fix for: #617220, #642025) - r8169: missing barriers. - r8169: fix unsigned int wraparound with TSO - r8169: remove the obsolete and incorrect AMD workaround Checksums-Sha1: e93fbe60ed384f00317bac627311c483cacbe9c6 14499 linux-2.6_2.6.32-48.dsc b86af2bbb4d533037fdfeb8d597cc58cd220dfa6 16375261 linux-2.6_2.6.32-48.diff.gz 13d9fa57c43c57e3849c75a56c12da2574ca6933 6083852 linux-doc-2.6.32_2.6.32-48_all.deb 70148992d07f75432a7f8692b9e11b5827675456 2745154 linux-manual-2.6.32_2.6.32-48_all.deb b9b3769d80d295b7a8b55b55a7c6b51b762a668c 10339944 linux-patch-debian-2.6.32_2.6.32-48_all.deb 8ec86d92b764c14f539251becbfbda5eb3674227 65513014 linux-source-2.6.32_2.6.32-48_all.deb 0b0d81a355869e207471cec6392f557070bc37ae 173070 linux-support-2.6.32-5_2.6.32-48_all.deb 829c2c3ebb85eaa5d5effd0d7337045b2bb917fc 160752 firmware-linux-free_2.6.32-48_all.deb 342524ee0a9aa2a9609d27e902c8c325160bf3d4 182754 linux-base_2.6.32-48_all.deb Checksums-Sha256: a3fd47ed6da9b6344db9d7b4d0685ae32b979f4021e0b91f22ade56760af177d 14499 linux-2.6_2.6.32-48.dsc 74585fea135a3be996c5d82aebfed44c6e06ec670575efe63c63c0c192a690a8 16375261 linux-2.6_2.6.32-48.diff.gz ad39243e1a1f1e6a06b15ffac1a443375ba085992472bd770acbcb3d89923333 6083852 linux-doc-2.6.32_2.6.32-48_all.deb 676d8f5e98889bb9a58f5d3d3cc0cbef8b7ce9f7abd7ca74a62aff05a2f771f5 2745154 linux-manual-2.6.32_2.6.32-48_all.deb 8817dec5088d71ae5fb609d2c48704cf3e4ae0bd75f124911d186460359aff5b 10339944 linux-patch-debian-2.6.32_2.6.32-48_all.deb 756d7795912e34004ac914774571b7a51622fdd981c7ebcb8216c5bb26d8f340 65513014 linux-source-2.6.32_2.6.32-48_all.deb 434432a113e6856f26a362f88217fac0cd2cc4244abfda1d38b16906068f353f 173070 linux-support-2.6.32-5_2.6.32-48_all.deb a5edbeaa5170a057fe58440d1f43545254152501938bedc94882f6076822c05c 160752 firmware-linux-free_2.6.32-48_all.deb 9243a5ac0835c0dfc0ea1d48c5e532e10218a3635fb4370d075cfd4a5ec47105 182754 linux-base_2.6.32-48_all.deb Files: 1127bfa38e6b9fe2fc39decd3f418d62 14499 kernel optional linux-2.6_2.6.32-48.dsc e453d89cd11a7019f731db2ae6bd2c4c 16375261 kernel optional linux-2.6_2.6.32-48.diff.gz 3e8770afb963b889b211f4a4102dfd21 6083852 doc optional linux-doc-2.6.32_2.6.32-48_all.deb f39e545e1871674a3ef8635655ad4bb3 2745154 doc optional linux-manual-2.6.32_2.6.32-48_all.deb 25256fe7301ef1645d39e9a70fef3224 10339944 kernel optional 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