From: Nicolas Saenz Julienne <nsaenzju@redhat.com> To: kernel test robot <oliver.sang@intel.com> Cc: lkp@lists.01.org, lkp@intel.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, frederic@kernel.org, tglx@linutronix.de, peterz@infradead.org, mtosatti@redhat.com, nilal@redhat.com, mgorman@suse.de, linux-rt-users@vger.kernel.org, vbabka@suse.cz, cl@linux.com, ppandit@redhat.com Subject: Re: [mm/page_alloc] 5541e53659: BUG:spinlock_bad_magic_on_CPU Date: Thu, 04 Nov 2021 17:39:44 +0100 [thread overview] Message-ID: <3190fc080138108c189626e22676aaae80b72414.camel@redhat.com> (raw) In-Reply-To: <20211104143809.GB6499@xsang-OptiPlex-9020> On Thu, 2021-11-04 at 22:38 +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed the following commit (built with gcc-9): > > commit: 5541e5365954069e4c7b649831c0e41bc9e5e081 ("[PATCH v2 2/3] mm/page_alloc: Convert per-cpu lists' local locks to per-cpu spin locks") > url: https://github.com/0day-ci/linux/commits/Nicolas-Saenz-Julienne/mm-page_alloc-Remote-per-cpu-page-list-drain-support/20211104-010825 > base: https://github.com/hnaz/linux-mm master > patch link: https://lore.kernel.org/lkml/20211103170512.2745765-3-nsaenzju@redhat.com > > in testcase: boot > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > +--------------------------------------------+------------+------------+ > > | 69c421f2b4 | 5541e53659 | > +--------------------------------------------+------------+------------+ > > boot_successes | 11 | 0 | > > boot_failures | 0 | 11 | > > BUG:spinlock_bad_magic_on_CPU | 0 | 11 | > > BUG:using_smp_processor_id()in_preemptible | 0 | 11 | > +--------------------------------------------+------------+------------+ > > > If you fix the issue, kindly add following tag > Reported-by: kernel test robot <oliver.sang@intel.com> > > > [ 0.161872][ T0] BUG: spinlock bad magic on CPU#0, swapper/0 > [ 0.162248][ T0] lock: 0xeb24bef0, .magic: 00000000, .owner: swapper/0, .owner_cpu: 0 > [ 0.162767][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.0-rc7-mm1-00437-g5541e5365954 #1 > [ 0.163325][ T0] Call Trace: > [ 0.163524][ T0] dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) > [ 0.163802][ T0] dump_stack (lib/dump_stack.c:114) > [ 0.164050][ T0] spin_bug (kernel/locking/spinlock_debug.c:70 kernel/locking/spinlock_debug.c:77) > [ 0.164296][ T0] do_raw_spin_unlock (arch/x86/include/asm/atomic.h:29 include/linux/atomic/atomic-instrumented.h:28 include/asm-generic/qspinlock.h:28 kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:140) > [ 0.164624][ T0] _raw_spin_unlock_irqrestore (include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:194) > [ 0.164971][ T0] free_unref_page (include/linux/spinlock.h:423 mm/page_alloc.c:3400) > [ 0.165253][ T0] free_the_page (mm/page_alloc.c:699) > [ 0.165521][ T0] __free_pages (mm/page_alloc.c:5453) > [ 0.165785][ T0] add_highpages_with_active_regions (include/linux/mm.h:2511 arch/x86/mm/init_32.c:416) > [ 0.166179][ T0] set_highmem_pages_init (arch/x86/mm/highmem_32.c:30) > [ 0.166501][ T0] mem_init (arch/x86/mm/init_32.c:749 (discriminator 2)) > [ 0.166749][ T0] start_kernel (init/main.c:842 init/main.c:988) > [ 0.167026][ T0] ? early_idt_handler_common (arch/x86/kernel/head_32.S:417) > [ 0.167369][ T0] i386_start_kernel (arch/x86/kernel/head32.c:57) > [ 0.167662][ T0] startup_32_smp (arch/x86/kernel/head_32.S:328) I did test this with lock debugging enabled, but I somehow missed this stack trace. Here's the fix: diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7dbdab100461..c8964e28aa59 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6853,6 +6853,7 @@ static void per_cpu_pages_init(struct per_cpu_pages *pcp, struct per_cpu_zonesta pcp->high = BOOT_PAGESET_HIGH; pcp->batch = BOOT_PAGESET_BATCH; pcp->free_factor = 0; + spin_lock_init(&pcp->lock); } static void __zone_set_pageset_high_and_batch(struct zone *zone, unsigned long high, @@ -6902,7 +6903,6 @@ void __meminit setup_zone_pageset(struct zone *zone) struct per_cpu_zonestat *pzstats; pcp = per_cpu_ptr(zone->per_cpu_pageset, cpu); - spin_lock_init(&pcp->lock); pzstats = per_cpu_ptr(zone->per_cpu_zonestats, cpu); per_cpu_pages_init(pcp, pzstats); } -- Nicolás Sáenz
WARNING: multiple messages have this Message-ID (diff)
From: Nicolas Saenz Julienne <nsaenzju@redhat.com> To: lkp@lists.01.org Subject: Re: [mm/page_alloc] 5541e53659: BUG:spinlock_bad_magic_on_CPU Date: Thu, 04 Nov 2021 17:39:44 +0100 [thread overview] Message-ID: <3190fc080138108c189626e22676aaae80b72414.camel@redhat.com> (raw) In-Reply-To: <20211104143809.GB6499@xsang-OptiPlex-9020> [-- Attachment #1: Type: text/plain, Size: 4130 bytes --] On Thu, 2021-11-04 at 22:38 +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed the following commit (built with gcc-9): > > commit: 5541e5365954069e4c7b649831c0e41bc9e5e081 ("[PATCH v2 2/3] mm/page_alloc: Convert per-cpu lists' local locks to per-cpu spin locks") > url: https://github.com/0day-ci/linux/commits/Nicolas-Saenz-Julienne/mm-page_alloc-Remote-per-cpu-page-list-drain-support/20211104-010825 > base: https://github.com/hnaz/linux-mm master > patch link: https://lore.kernel.org/lkml/20211103170512.2745765-3-nsaenzju(a)redhat.com > > in testcase: boot > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > +--------------------------------------------+------------+------------+ > > | 69c421f2b4 | 5541e53659 | > +--------------------------------------------+------------+------------+ > > boot_successes | 11 | 0 | > > boot_failures | 0 | 11 | > > BUG:spinlock_bad_magic_on_CPU | 0 | 11 | > > BUG:using_smp_processor_id()in_preemptible | 0 | 11 | > +--------------------------------------------+------------+------------+ > > > If you fix the issue, kindly add following tag > Reported-by: kernel test robot <oliver.sang@intel.com> > > > [ 0.161872][ T0] BUG: spinlock bad magic on CPU#0, swapper/0 > [ 0.162248][ T0] lock: 0xeb24bef0, .magic: 00000000, .owner: swapper/0, .owner_cpu: 0 > [ 0.162767][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.0-rc7-mm1-00437-g5541e5365954 #1 > [ 0.163325][ T0] Call Trace: > [ 0.163524][ T0] dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) > [ 0.163802][ T0] dump_stack (lib/dump_stack.c:114) > [ 0.164050][ T0] spin_bug (kernel/locking/spinlock_debug.c:70 kernel/locking/spinlock_debug.c:77) > [ 0.164296][ T0] do_raw_spin_unlock (arch/x86/include/asm/atomic.h:29 include/linux/atomic/atomic-instrumented.h:28 include/asm-generic/qspinlock.h:28 kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:140) > [ 0.164624][ T0] _raw_spin_unlock_irqrestore (include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:194) > [ 0.164971][ T0] free_unref_page (include/linux/spinlock.h:423 mm/page_alloc.c:3400) > [ 0.165253][ T0] free_the_page (mm/page_alloc.c:699) > [ 0.165521][ T0] __free_pages (mm/page_alloc.c:5453) > [ 0.165785][ T0] add_highpages_with_active_regions (include/linux/mm.h:2511 arch/x86/mm/init_32.c:416) > [ 0.166179][ T0] set_highmem_pages_init (arch/x86/mm/highmem_32.c:30) > [ 0.166501][ T0] mem_init (arch/x86/mm/init_32.c:749 (discriminator 2)) > [ 0.166749][ T0] start_kernel (init/main.c:842 init/main.c:988) > [ 0.167026][ T0] ? early_idt_handler_common (arch/x86/kernel/head_32.S:417) > [ 0.167369][ T0] i386_start_kernel (arch/x86/kernel/head32.c:57) > [ 0.167662][ T0] startup_32_smp (arch/x86/kernel/head_32.S:328) I did test this with lock debugging enabled, but I somehow missed this stack trace. Here's the fix: diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7dbdab100461..c8964e28aa59 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6853,6 +6853,7 @@ static void per_cpu_pages_init(struct per_cpu_pages *pcp, struct per_cpu_zonesta pcp->high = BOOT_PAGESET_HIGH; pcp->batch = BOOT_PAGESET_BATCH; pcp->free_factor = 0; + spin_lock_init(&pcp->lock); } static void __zone_set_pageset_high_and_batch(struct zone *zone, unsigned long high, @@ -6902,7 +6903,6 @@ void __meminit setup_zone_pageset(struct zone *zone) struct per_cpu_zonestat *pzstats; pcp = per_cpu_ptr(zone->per_cpu_pageset, cpu); - spin_lock_init(&pcp->lock); pzstats = per_cpu_ptr(zone->per_cpu_zonestats, cpu); per_cpu_pages_init(pcp, pzstats); } -- Nicolás Sáenz
next prev parent reply other threads:[~2021-11-04 16:39 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-03 17:05 [PATCH v2 0/3] mm/page_alloc: Remote per-cpu page list drain support Nicolas Saenz Julienne 2021-11-03 17:05 ` [PATCH v2 1/3] mm/page_alloc: Don't pass pfn to free_unref_page_commit() Nicolas Saenz Julienne 2021-11-23 14:41 ` Vlastimil Babka 2021-11-03 17:05 ` [PATCH v2 2/3] mm/page_alloc: Convert per-cpu lists' local locks to per-cpu spin locks Nicolas Saenz Julienne 2021-11-04 14:38 ` [mm/page_alloc] 5541e53659: BUG:spinlock_bad_magic_on_CPU kernel test robot 2021-11-04 14:38 ` kernel test robot 2021-11-04 16:39 ` Nicolas Saenz Julienne [this message] 2021-11-04 16:39 ` Nicolas Saenz Julienne 2021-11-03 17:05 ` [PATCH v2 3/3] mm/page_alloc: Remotely drain per-cpu lists Nicolas Saenz Julienne 2021-12-03 14:13 ` Mel Gorman 2021-12-09 10:50 ` Nicolas Saenz Julienne 2021-12-09 17:45 ` Marcelo Tosatti 2021-12-10 10:55 ` Mel Gorman 2021-12-14 10:58 ` Marcelo Tosatti 2021-12-14 11:42 ` Christoph Lameter 2021-12-14 12:25 ` Marcelo Tosatti 2021-11-23 14:58 ` [PATCH v2 0/3] mm/page_alloc: Remote per-cpu page list drain support Vlastimil Babka 2021-11-30 18:09 ` Nicolas Saenz Julienne 2021-12-01 14:01 ` Marcelo Tosatti
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