August 2019 - Linux-stable-mirror

[patch 04/17] mm: vmscan: check if mem cgroup is disabled or not before calling memcg slab shrinker

by akpm＠linux-foundation.org

From: Yang Shi <yang.shi(a)linux.alibaba.com> Subject: mm: vmscan: check if mem cgroup is disabled or not before calling memcg slab shrinker Shakeel Butt reported premature oom on kernel with "cgroup_disable=memory" since mem_cgroup_is_root() returns false even though memcg is actually NULL. The drop_caches is also broken. It is because aeed1d325d42 ("mm/vmscan.c: generalize shrink_slab() calls in shrink_node()") removed the !memcg check before !mem_cgroup_is_root(). And, surprisingly root memcg is allocated even though memory cgroup is disabled by kernel boot parameter. Add mem_cgroup_disabled() check to make reclaimer work as expected. Link: http://lkml.kernel.org/r/1563385526-20805-1-git-send-email-yang.shi@linux.a… Fixes: aeed1d325d42 ("mm/vmscan.c: generalize shrink_slab() calls in shrink_node()") Signed-off-by: Yang Shi <yang.shi(a)linux.alibaba.com> Reported-by: Shakeel Butt <shakeelb(a)google.com> Reviewed-by: Shakeel Butt <shakeelb(a)google.com> Reviewed-by: Kirill Tkhai <ktkhai(a)virtuozzo.com> Acked-by: Michal Hocko <mhocko(a)suse.com> Cc: Jan Hadrava <had(a)kam.mff.cuni.cz> Cc: Vladimir Davydov <vdavydov.dev(a)gmail.com> Cc: Johannes Weiner <hannes(a)cmpxchg.org> Cc: Roman Gushchin <guro(a)fb.com> Cc: Hugh Dickins <hughd(a)google.com> Cc: Qian Cai <cai(a)lca.pw> Cc: Kirill A. Shutemov <kirill.shutemov(a)linux.intel.com> Cc: <stable(a)vger.kernel.org> [4.19+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/vmscan.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/mm/vmscan.c~mm-vmscan-check-if-mem-cgroup-is-disabled-or-not-before-calling-memcg-slab-shrinker +++ a/mm/vmscan.c @@ -699,7 +699,14 @@ static unsigned long shrink_slab(gfp_t g unsigned long ret, freed = 0; struct shrinker *shrinker; - if (!mem_cgroup_is_root(memcg)) + /* + * The root memcg might be allocated even though memcg is disabled + * via "cgroup_disable=memory" boot parameter. This could make + * mem_cgroup_is_root() return false, then just run memcg slab + * shrink, but skip global shrink. This may result in premature + * oom. + */ + if (!mem_cgroup_disabled() && !mem_cgroup_is_root(memcg)) return shrink_slab_memcg(gfp_mask, nid, memcg, priority); if (!down_read_trylock(&shrinker_rwsem)) _

4 years, 9 months

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[PATCH v3] mtd: rawnand: micron: handle on-die "ECC-off" devices correctly

by Marco Felsch

Some devices are not supposed to support on-die ECC but experience shows that internal ECC machinery can actually be enabled through the "SET FEATURE (EFh)" command, even if a read of the "READ ID Parameter Tables" returns that it is not. Currently, the driver checks the "READ ID Parameter" field directly after having enabled the feature. If the check fails it returns immediately but leaves the ECC on. When using buggy chips like MT29F2G08ABAGA and MT29F2G08ABBGA, all future read/program cycles will go through the on-die ECC, confusing the host controller which is supposed to be the one handling correction. To address this in a common way we need to turn off the on-die ECC directly after reading the "READ ID Parameter" and before checking the "ECC status". Cc: stable(a)vger.kernel.org Fixes: dbc44edbf833 ("mtd: rawnand: micron: Fix on-die ECC detection logic") Signed-off-by: Marco Felsch <m.felsch(a)pengutronix.de> Reviewed-by: Boris Brezillon <boris.brezillon(a)collabora.com> --- drivers/mtd/nand/raw/nand_micron.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c index 1622d3145587..8ca9fad6e6ad 100644 --- a/drivers/mtd/nand/raw/nand_micron.c +++ b/drivers/mtd/nand/raw/nand_micron.c @@ -390,6 +390,14 @@ static int micron_supports_on_die_ecc(struct nand_chip *chip) (chip->id.data[4] & MICRON_ID_INTERNAL_ECC_MASK) != 0x2) return MICRON_ON_DIE_UNSUPPORTED; + /* + * It seems that there are devices which do not support ECC officially. + * At least the MT29F2G08ABAGA / MT29F2G08ABBGA devices supports + * enabling the ECC feature but don't reflect that to the READ_ID table. + * So we have to guarantee that we disable the ECC feature directly + * after we did the READ_ID table command. Later we can evaluate the + * ECC_ENABLE support. + */ ret = micron_nand_on_die_ecc_setup(chip, true); if (ret) return MICRON_ON_DIE_UNSUPPORTED; @@ -398,13 +406,13 @@ static int micron_supports_on_die_ecc(struct nand_chip *chip) if (ret) return MICRON_ON_DIE_UNSUPPORTED; - if (!(id[4] & MICRON_ID_ECC_ENABLED)) - return MICRON_ON_DIE_UNSUPPORTED; - ret = micron_nand_on_die_ecc_setup(chip, false); if (ret) return MICRON_ON_DIE_UNSUPPORTED; + if (!(id[4] & MICRON_ID_ECC_ENABLED)) + return MICRON_ON_DIE_UNSUPPORTED; + ret = nand_readid_op(chip, 0, id, sizeof(id)); if (ret) return MICRON_ON_DIE_UNSUPPORTED; -- 2.20.1

4 years, 9 months

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stable-rc/linux-4.4.y boot: 92 boots: 1 failed, 58 passed with 32 offline, 1 conflict (v4.4.186-157-gd9815060e3ec)

by kernelci.org bot

stable-rc/linux-4.4.y boot: 92 boots: 1 failed, 58 passed with 32 offline, 1 conflict (v4.4.186-157-gd9815060e3ec) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.4.y/kernel/v4.4.… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.4.y/kernel/v4.4.186-157… Tree: stable-rc Branch: linux-4.4.y Git Describe: v4.4.186-157-gd9815060e3ec Git Commit: d9815060e3ec2433dfffc8a3dcaed9842b1798c7 Git URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 44 unique boards, 20 SoC families, 14 builds out of 190 Boot Failure Detected: arm64: defconfig: gcc-8: qcom-qdf2400: 1 failed lab Offline Platforms: arm: tegra_defconfig: gcc-8 tegra20-iris-512: 1 offline lab exynos_defconfig: gcc-8 exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab multi_v7_defconfig: gcc-8 bcm72521-bcm97252sffe: 1 offline lab bcm7445-bcm97445c: 1 offline lab exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab meson8b-odroidc1: 1 offline lab omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom-apq8064-ifc6410: 1 offline lab stih410-b2120: 1 offline lab sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab tegra20-iris-512: 1 offline lab vf610-colibri-eval-v3: 1 offline lab omap2plus_defconfig: gcc-8 omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom_defconfig: gcc-8 qcom-apq8064-ifc6410: 1 offline lab davinci_all_defconfig: gcc-8 da850-evm: 1 offline lab dm365evm,legacy: 1 offline lab imx_v6_v7_defconfig: gcc-8 imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab vf610-colibri-eval-v3: 1 offline lab sunxi_defconfig: gcc-8 sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab Conflicting Boot Failure Detected: (These likely are not failures as other labs are reporting PASS. Needs review.) x86_64: x86_64_defconfig: qemu: lab-drue: PASS (gcc-8) lab-mhart: PASS (gcc-8) lab-baylibre: FAIL (gcc-8) lab-linaro-lkft: PASS (gcc-8) lab-collabora: PASS (gcc-8) --- For more info write to <info(a)kernelci.org>

4 years, 9 months

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stable-rc/linux-5.2.y boot: 135 boots: 0 failed, 89 passed with 45 offline, 1 untried/unknown (v5.2.4-235-g44397d30b22d)

by kernelci.org bot

stable-rc/linux-5.2.y boot: 135 boots: 0 failed, 89 passed with 45 offline, 1 untried/unknown (v5.2.4-235-g44397d30b22d) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-5.2.y/kernel/v5.2.… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-5.2.y/kernel/v5.2.4-235-g… Tree: stable-rc Branch: linux-5.2.y Git Describe: v5.2.4-235-g44397d30b22d Git Commit: 44397d30b22dd93340c705ef34bb61c16f43503b Git URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 78 unique boards, 28 SoC families, 17 builds out of 209 Offline Platforms: riscv: defconfig: gcc-8 sifive_fu540: 1 offline lab arm64: defconfig: gcc-8 meson-axg-s400: 1 offline lab meson-g12a-u200: 1 offline lab meson-g12a-x96-max: 1 offline lab meson-gxbb-odroidc2: 1 offline lab meson-gxl-s905d-p230: 1 offline lab meson-gxl-s905x-libretech-cc: 1 offline lab meson-gxl-s905x-nexbox-a95x: 1 offline lab meson-gxl-s905x-p212: 1 offline lab meson-gxm-nexbox-a1: 1 offline lab rk3399-firefly: 1 offline lab sun50i-a64-pine64-plus: 1 offline lab mips: pistachio_defconfig: gcc-8 pistachio_marduk: 1 offline lab arm: exynos_defconfig: gcc-8 exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab multi_v7_defconfig: gcc-8 bcm72521-bcm97252sffe: 1 offline lab bcm7445-bcm97445c: 1 offline lab exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab imx7s-warp: 1 offline lab meson8b-odroidc1: 1 offline lab omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom-apq8064-ifc6410: 1 offline lab stih410-b2120: 1 offline lab sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab vf610-colibri-eval-v3: 1 offline lab omap2plus_defconfig: gcc-8 omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom_defconfig: gcc-8 qcom-apq8064-ifc6410: 1 offline lab davinci_all_defconfig: gcc-8 da850-evm: 1 offline lab dm365evm,legacy: 1 offline lab imx_v6_v7_defconfig: gcc-8 imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab imx7s-warp: 1 offline lab vf610-colibri-eval-v3: 1 offline lab sunxi_defconfig: gcc-8 sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab --- For more info write to <info(a)kernelci.org>

4 years, 9 months

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stable-rc/linux-4.14.y boot: 118 boots: 1 failed, 76 passed with 41 offline (v4.14.134-319-g8c06cc9d4172)

by kernelci.org bot

stable-rc/linux-4.14.y boot: 118 boots: 1 failed, 76 passed with 41 offline (v4.14.134-319-g8c06cc9d4172) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.14.y/kernel/v4.1… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.14.y/kernel/v4.14.134-3… Tree: stable-rc Branch: linux-4.14.y Git Describe: v4.14.134-319-g8c06cc9d4172 Git Commit: 8c06cc9d417294ee552cee5025f8dad9a982a026 Git URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 64 unique boards, 26 SoC families, 16 builds out of 201 Boot Failure Detected: arc: hsdk_defconfig: gcc-8: hsdk: 1 failed lab Offline Platforms: arm64: defconfig: gcc-8 meson-gxbb-odroidc2: 1 offline lab meson-gxl-s905d-p230: 1 offline lab meson-gxl-s905x-libretech-cc: 1 offline lab meson-gxl-s905x-nexbox-a95x: 1 offline lab meson-gxl-s905x-p212: 1 offline lab meson-gxm-nexbox-a1: 1 offline lab rk3399-firefly: 1 offline lab sun50i-a64-pine64-plus: 1 offline lab mips: pistachio_defconfig: gcc-8 pistachio_marduk: 1 offline lab arm: tegra_defconfig: gcc-8 tegra20-iris-512: 1 offline lab exynos_defconfig: gcc-8 exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab multi_v7_defconfig: gcc-8 exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab imx7s-warp: 1 offline lab meson8b-odroidc1: 1 offline lab omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom-apq8064-ifc6410: 1 offline lab stih410-b2120: 1 offline lab sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab tegra20-iris-512: 1 offline lab vf610-colibri-eval-v3: 1 offline lab omap2plus_defconfig: gcc-8 omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom_defconfig: gcc-8 qcom-apq8064-ifc6410: 1 offline lab davinci_all_defconfig: gcc-8 da850-evm: 1 offline lab dm365evm,legacy: 1 offline lab imx_v6_v7_defconfig: gcc-8 imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab imx7s-warp: 1 offline lab vf610-colibri-eval-v3: 1 offline lab sunxi_defconfig: gcc-8 sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab --- For more info write to <info(a)kernelci.org>

4 years, 9 months

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[PATCH v3 2/3] mm/hmm: fix ZONE_DEVICE anon page mapping reuse

by Ralph Campbell

When a ZONE_DEVICE private page is freed, the page->mapping field can be set. If this page is reused as an anonymous page, the previous value can prevent the page from being inserted into the CPU's anon rmap table. For example, when migrating a pte_none() page to device memory: migrate_vma(ops, vma, start, end, src, dst, private) migrate_vma_collect() src[] = MIGRATE_PFN_MIGRATE migrate_vma_prepare() /* no page to lock or isolate so OK */ migrate_vma_unmap() /* no page to unmap so OK */ ops->alloc_and_copy() /* driver allocates ZONE_DEVICE page for dst[] */ migrate_vma_pages() migrate_vma_insert_page() page_add_new_anon_rmap() __page_set_anon_rmap() /* This check sees the page's stale mapping field */ if (PageAnon(page)) return /* page->mapping is not updated */ The result is that the migration appears to succeed but a subsequent CPU fault will be unable to migrate the page back to system memory or worse. Clear the page->mapping field when freeing the ZONE_DEVICE page so stale pointer data doesn't affect future page use. Fixes: b7a523109fb5c9d2d6dd ("mm: don't clear ->mapping in hmm_devmem_free") Cc: stable(a)vger.kernel.org Signed-off-by: Ralph Campbell <rcampbell(a)nvidia.com> Reviewed-by: John Hubbard <jhubbard(a)nvidia.com> Reviewed-by: Christoph Hellwig <hch(a)lst.de> Cc: Dan Williams <dan.j.williams(a)intel.com> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Jason Gunthorpe <jgg(a)mellanox.com> Cc: Logan Gunthorpe <logang(a)deltatee.com> Cc: Ira Weiny <ira.weiny(a)intel.com> Cc: Matthew Wilcox <willy(a)infradead.org> Cc: Mel Gorman <mgorman(a)techsingularity.net> Cc: Jan Kara <jack(a)suse.cz> Cc: "Kirill A. Shutemov" <kirill.shutemov(a)linux.intel.com> Cc: Michal Hocko <mhocko(a)suse.com> Cc: Andrea Arcangeli <aarcange(a)redhat.com> Cc: Mike Kravetz <mike.kravetz(a)oracle.com> Cc: "Jérôme Glisse" <jglisse(a)redhat.com> --- kernel/memremap.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/kernel/memremap.c b/kernel/memremap.c index 6ee03a816d67..289a086e1467 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -397,6 +397,30 @@ void __put_devmap_managed_page(struct page *page) mem_cgroup_uncharge(page); + /* + * When a device_private page is freed, the page->mapping field + * may still contain a (stale) mapping value. For example, the + * lower bits of page->mapping may still identify the page as + * an anonymous page. Ultimately, this entire field is just + * stale and wrong, and it will cause errors if not cleared. + * One example is: + * + * migrate_vma_pages() + * migrate_vma_insert_page() + * page_add_new_anon_rmap() + * __page_set_anon_rmap() + * ...checks page->mapping, via PageAnon(page) call, + * and incorrectly concludes that the page is an + * anonymous page. Therefore, it incorrectly, + * silently fails to set up the new anon rmap. + * + * For other types of ZONE_DEVICE pages, migration is either + * handled differently or not done at all, so there is no need + * to clear page->mapping. + */ + if (is_device_private_page(page)) + page->mapping = NULL; + page->pgmap->ops->page_free(page); } else if (!count) __put_page(page); -- 2.20.1

4 years, 9 months

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[PATCH AUTOSEL 4.4 01/17] netfilter: nfnetlink: avoid deadlock due to synchronous request_module

by Sasha Levin

From: Florian Westphal <fw(a)strlen.de> [ Upstream commit 1b0890cd60829bd51455dc5ad689ed58c4408227 ] Thomas and Juliana report a deadlock when running: (rmmod nf_conntrack_netlink/xfrm_user) conntrack -e NEW -E & modprobe -v xfrm_user They provided following analysis: conntrack -e NEW -E netlink_bind() netlink_lock_table() -> increases "nl_table_users" nfnetlink_bind() # does not unlock the table as it's locked by netlink_bind() __request_module() call_usermodehelper_exec() This triggers "modprobe nf_conntrack_netlink" from kernel, netlink_bind() won't return until modprobe process is done. "modprobe xfrm_user": xfrm_user_init() register_pernet_subsys() -> grab pernet_ops_rwsem .. netlink_table_grab() calls schedule() as "nl_table_users" is non-zero so modprobe is blocked because netlink_bind() increased nl_table_users while also holding pernet_ops_rwsem. "modprobe nf_conntrack_netlink" runs and inits nf_conntrack_netlink: ctnetlink_init() register_pernet_subsys() -> blocks on "pernet_ops_rwsem" thanks to xfrm_user module both modprobe processes wait on one another -- neither can make progress. Switch netlink_bind() to "nowait" modprobe -- this releases the netlink table lock, which then allows both modprobe instances to complete. Reported-by: Thomas Jarosch <thomas.jarosch(a)intra2net.com> Reported-by: Juliana Rodrigueiro <juliana.rodrigueiro(a)intra2net.com> Signed-off-by: Florian Westphal <fw(a)strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo(a)netfilter.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/netfilter/nfnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c index 9adedba78eeac..044559c10e98e 100644 --- a/net/netfilter/nfnetlink.c +++ b/net/netfilter/nfnetlink.c @@ -495,7 +495,7 @@ static int nfnetlink_bind(struct net *net, int group) ss = nfnetlink_get_subsys(type << 8); rcu_read_unlock(); if (!ss) - request_module("nfnetlink-subsys-%d", type); + request_module_nowait("nfnetlink-subsys-%d", type); return 0; } #endif -- 2.20.1

4 years, 9 months

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stable-rc/linux-4.4.y boot: 92 boots: 1 failed, 58 passed with 32 offline, 1 conflict (v4.4.186-159-g26f755a0d3e0)

by kernelci.org bot

stable-rc/linux-4.4.y boot: 92 boots: 1 failed, 58 passed with 32 offline, 1 conflict (v4.4.186-159-g26f755a0d3e0) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.4.y/kernel/v4.4.… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.4.y/kernel/v4.4.186-159… Tree: stable-rc Branch: linux-4.4.y Git Describe: v4.4.186-159-g26f755a0d3e0 Git Commit: 26f755a0d3e0884934f21afabbc52ed37a071e95 Git URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 44 unique boards, 20 SoC families, 14 builds out of 190 Boot Failure Detected: arm64: defconfig: gcc-8: qcom-qdf2400: 1 failed lab Offline Platforms: arm: tegra_defconfig: gcc-8 tegra20-iris-512: 1 offline lab exynos_defconfig: gcc-8 exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab multi_v7_defconfig: gcc-8 bcm72521-bcm97252sffe: 1 offline lab bcm7445-bcm97445c: 1 offline lab exynos5250-arndale: 1 offline lab exynos5420-arndale-octa: 1 offline lab exynos5800-peach-pi: 1 offline lab imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab meson8b-odroidc1: 1 offline lab omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom-apq8064-ifc6410: 1 offline lab stih410-b2120: 1 offline lab sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab tegra20-iris-512: 1 offline lab vf610-colibri-eval-v3: 1 offline lab omap2plus_defconfig: gcc-8 omap3-beagle: 1 offline lab omap4-panda: 1 offline lab qcom_defconfig: gcc-8 qcom-apq8064-ifc6410: 1 offline lab davinci_all_defconfig: gcc-8 da850-evm: 1 offline lab dm365evm,legacy: 1 offline lab imx_v6_v7_defconfig: gcc-8 imx6dl-wandboard_dual: 1 offline lab imx6dl-wandboard_solo: 1 offline lab imx6q-wandboard: 1 offline lab vf610-colibri-eval-v3: 1 offline lab sunxi_defconfig: gcc-8 sun4i-a10-cubieboard: 1 offline lab sun7i-a20-bananapi: 1 offline lab Conflicting Boot Failure Detected: (These likely are not failures as other labs are reporting PASS. Needs review.) x86_64: x86_64_defconfig: qemu: lab-linaro-lkft: PASS (gcc-8) lab-drue: PASS (gcc-8) lab-baylibre: PASS (gcc-8) lab-collabora: FAIL (gcc-8) lab-mhart: PASS (gcc-8) --- For more info write to <info(a)kernelci.org>

4 years, 9 months

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RE: [PATCH] PCI: hv: Fix panic by calling hv_pci_remove_slots() earlier

by Dexuan Cui

> From: Sasha Levin <sashal(a)kernel.org> > Sent: Friday, August 2, 2019 11:08 AM > > Hi, > > [This is an automated email] > > This commit has been processed because it contains a "Fixes:" tag, > fixing commit: 15becc2b56c6 PCI: hv: Add hv_pci_remove_slots() when we > unload the driver. > > The bot has tested the following trees: v5.2.5, v4.19.63, v4.14.135. > > v5.2.5: Build OK! > v4.19.63: Build OK! > v4.14.135: Failed to apply! Possible dependencies: > Unable to calculate > > NOTE: The patch will not be queued to stable trees until it is upstream. > > How should we proceed with this patch? > Sasha I'm waiting the patch to be accepted into the pci tree first. We do not need to do anything at this moment. Thanks, -- Dexuan

4 years, 9 months

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[PATCH AUTOSEL 4.14 01/30] netfilter: nfnetlink: avoid deadlock due to synchronous request_module

by Sasha Levin

From: Florian Westphal <fw(a)strlen.de> [ Upstream commit 1b0890cd60829bd51455dc5ad689ed58c4408227 ] Thomas and Juliana report a deadlock when running: (rmmod nf_conntrack_netlink/xfrm_user) conntrack -e NEW -E & modprobe -v xfrm_user They provided following analysis: conntrack -e NEW -E netlink_bind() netlink_lock_table() -> increases "nl_table_users" nfnetlink_bind() # does not unlock the table as it's locked by netlink_bind() __request_module() call_usermodehelper_exec() This triggers "modprobe nf_conntrack_netlink" from kernel, netlink_bind() won't return until modprobe process is done. "modprobe xfrm_user": xfrm_user_init() register_pernet_subsys() -> grab pernet_ops_rwsem .. netlink_table_grab() calls schedule() as "nl_table_users" is non-zero so modprobe is blocked because netlink_bind() increased nl_table_users while also holding pernet_ops_rwsem. "modprobe nf_conntrack_netlink" runs and inits nf_conntrack_netlink: ctnetlink_init() register_pernet_subsys() -> blocks on "pernet_ops_rwsem" thanks to xfrm_user module both modprobe processes wait on one another -- neither can make progress. Switch netlink_bind() to "nowait" modprobe -- this releases the netlink table lock, which then allows both modprobe instances to complete. Reported-by: Thomas Jarosch <thomas.jarosch(a)intra2net.com> Reported-by: Juliana Rodrigueiro <juliana.rodrigueiro(a)intra2net.com> Signed-off-by: Florian Westphal <fw(a)strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo(a)netfilter.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/netfilter/nfnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c index 733d3e4a30d85..2cee032af46d2 100644 --- a/net/netfilter/nfnetlink.c +++ b/net/netfilter/nfnetlink.c @@ -530,7 +530,7 @@ static int nfnetlink_bind(struct net *net, int group) ss = nfnetlink_get_subsys(type << 8); rcu_read_unlock(); if (!ss) - request_module("nfnetlink-subsys-%d", type); + request_module_nowait("nfnetlink-subsys-%d", type); return 0; } #endif -- 2.20.1

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Linux-stable-mirror August 2019