search for: __alloc_pages_slowpath

...gt; __alloc_pages_may_oom() >>> Fails to take oom_lock and loop forever >> __alloc_pages_may_oom() uses mutex_trylock(&oom_lock). > Yes. But this mutex_trylock(&oom_lock) is semantically mutex_lock(&oom_lock) > because __alloc_pages_slowpath() will continue looping until > mutex_trylock(&oom_lock) succeeds (or somebody releases memory). > >> I think the second __alloc_pages_may_oom() will not continue since the >> first one is in progress. > The second __alloc_pages_may_oom() will be called repeatedly because &...

...wap: 4095 24 4071 Error logs: kernel: md127_raid6: page allocation failure: order:0, mode:0x200000 kernel: Pid: 623, comm: md127_raid6 Not tainted 3.7.8+ #7 kernel: Call Trace: kernel: [<ffffffff81117a93>] warn_alloc_failed+0xf3/0x140 kernel: [<ffffffff8111aa90>] __alloc_pages_slowpath+0x4b0/0x7b0 kernel: [<ffffffff8111aa90>] ? __alloc_pages_slowpath+0x4b0/0x7b0 kernel: [<ffffffff8111afaa>] __alloc_pages_nodemask+0x21a/0x230 kernel: [<ffffffff8111afaa>] ? __alloc_pages_nodemask+0x21a/0x230 kernel: [<ffffffff8115c9d4>] kmem_getpages+0x64/0x190 kernel: [<...

...0008010 ffff880c1c6eb8a8 00000000553c90b1 [Mon Oct 23 16:43:32 2017] Call Trace: [Mon Oct 23 16:43:32 2017]? [<ffffffff816a3db1>] dump_stack+0x19/0x1b [Mon Oct 23 16:43:32 2017]? [<ffffffff81188810>] warn_alloc_failed+0x110/0x180 [Mon Oct 23 16:43:32 2017]? [<ffffffff8169fd8a>] __alloc_pages_slowpath+0x6b6/0x724 [Mon Oct 23 16:43:32 2017]? [<ffffffff8118cd85>] __alloc_pages_nodemask+0x405/0x420 [Mon Oct 23 16:43:32 2017]? [<ffffffff81030f8f>] dma_generic_alloc_coherent+0x8f/0x140 [Mon Oct 23 16:43:32 2017]? [<ffffffff81065c0d>] gart_alloc_coherent+0x2d/0x40 [Mon Oct 23 16:4...

...ndard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 [ 238.341121] Call Trace: [ 238.341337] dump_stack+0x8f/0xd0 [ 238.341630] dump_header+0x61/0x5ea [ 238.341942] oom_kill_process.cold+0xb/0x10 [ 238.342299] out_of_memory+0x24d/0x5a0 [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 [ 238.343024] __alloc_pages_nodemask+0x391/0x410 [ 238.343407] pagecache_get_page+0xc3/0x3a0 [ 238.343757] filemap_fault+0x804/0xc30 [ 238.344083] ? ext4_filemap_fault+0x28/0x42 [ 238.344444] ext4_filemap_fault+0x30/0x42 [ 238.344789] __do_fault+0x37/0x1a0 [...

...ndard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 [ 238.341121] Call Trace: [ 238.341337] dump_stack+0x8f/0xd0 [ 238.341630] dump_header+0x61/0x5ea [ 238.341942] oom_kill_process.cold+0xb/0x10 [ 238.342299] out_of_memory+0x24d/0x5a0 [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 [ 238.343024] __alloc_pages_nodemask+0x391/0x410 [ 238.343407] pagecache_get_page+0xc3/0x3a0 [ 238.343757] filemap_fault+0x804/0xc30 [ 238.344083] ? ext4_filemap_fault+0x28/0x42 [ 238.344444] ext4_filemap_fault+0x30/0x42 [ 238.344789] __do_fault+0x37/0x1a0 [...

...ndard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 [ 238.341121] Call Trace: [ 238.341337] dump_stack+0x8f/0xd0 [ 238.341630] dump_header+0x61/0x5ea [ 238.341942] oom_kill_process.cold+0xb/0x10 [ 238.342299] out_of_memory+0x24d/0x5a0 [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 [ 238.343024] __alloc_pages_nodemask+0x391/0x410 [ 238.343407] pagecache_get_page+0xc3/0x3a0 [ 238.343757] filemap_fault+0x804/0xc30 [ 238.344083] ? ext4_filemap_fault+0x28/0x42 [ 238.344444] ext4_filemap_fault+0x30/0x42 [ 238.344789] __do_fault+0x37/0x1a0 [...

...ndard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 [ 238.341121] Call Trace: [ 238.341337] dump_stack+0x8f/0xd0 [ 238.341630] dump_header+0x61/0x5ea [ 238.341942] oom_kill_process.cold+0xb/0x10 [ 238.342299] out_of_memory+0x24d/0x5a0 [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 [ 238.343024] __alloc_pages_nodemask+0x391/0x410 [ 238.343407] pagecache_get_page+0xc3/0x3a0 [ 238.343757] filemap_fault+0x804/0xc30 [ 238.344083] ? ext4_filemap_fault+0x28/0x42 [ 238.344444] ext4_filemap_fault+0x30/0x42 [ 238.344789] __do_fault+0x37/0x1a0 [...

...2 Not tainted 4.14.0-rc5+ #302 [ 19.532397] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 [ 19.533285] Workqueue: events_freezable update_balloon_size_func [virtio_balloon] [ 19.534143] Call Trace: [ 19.535015] dump_stack+0x63/0x87 [ 19.535844] warn_alloc+0x114/0x1c0 [ 19.536667] __alloc_pages_slowpath+0x9a6/0xba7 [ 19.537491] ? sched_clock_cpu+0x11/0xb0 [ 19.538311] __alloc_pages_nodemask+0x26a/0x290 [ 19.539188] alloc_pages_current+0x6a/0xb0 [ 19.540004] balloon_page_enqueue+0x25/0xf0 [ 19.540818] update_balloon_size_func+0xe1/0x260 [virtio_balloon] [ 19.541626] process_one_wo...

...2 Not tainted 4.14.0-rc5+ #302 [ 19.532397] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 [ 19.533285] Workqueue: events_freezable update_balloon_size_func [virtio_balloon] [ 19.534143] Call Trace: [ 19.535015] dump_stack+0x63/0x87 [ 19.535844] warn_alloc+0x114/0x1c0 [ 19.536667] __alloc_pages_slowpath+0x9a6/0xba7 [ 19.537491] ? sched_clock_cpu+0x11/0xb0 [ 19.538311] __alloc_pages_nodemask+0x26a/0x290 [ 19.539188] alloc_pages_current+0x6a/0xb0 [ 19.540004] balloon_page_enqueue+0x25/0xf0 [ 19.540818] update_balloon_size_func+0xe1/0x260 [virtio_balloon] [ 19.541626] process_one_wo...

On Sat, Sep 30, 2017 at 12:05:52PM +0800, Wei Wang wrote: > +static inline void xb_set_page(struct virtio_balloon *vb, > + struct page *page, > + unsigned long *pfn_min, > + unsigned long *pfn_max) > +{ > + unsigned long pfn = page_to_pfn(page); > + > + *pfn_min = min(pfn, *pfn_min); > + *pfn_max = max(pfn, *pfn_max); > +

On Sat, Sep 30, 2017 at 12:05:52PM +0800, Wei Wang wrote: > +static inline void xb_set_page(struct virtio_balloon *vb, > + struct page *page, > + unsigned long *pfn_min, > + unsigned long *pfn_max) > +{ > + unsigned long pfn = page_to_pfn(page); > + > + *pfn_min = min(pfn, *pfn_min); > + *pfn_max = max(pfn, *pfn_max); > +

...urns -ENOMEM when > > alloc_pages() fails. Do you boot the guest with minal RAM assigned? > > > > Regards, > > > > Joerg > > > > I just want to add some context around this. The call path that lead to the > failure is like the following: > > __alloc_pages_slowpath > __alloc_pages_nodemask > alloc_pages_current > alloc_pages > split_large_page > __change_page_attr > __change_page_attr_set_clr > __set_memory_enc_dec > set_memory_decrypted > sev_es_init_ghcbs > trap_init -> before mm_init (in init/main.c) > start...

...> [ 19.532397] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 > [ 19.533285] Workqueue: events_freezable update_balloon_size_func [virtio_balloon] > [ 19.534143] Call Trace: > [ 19.535015] dump_stack+0x63/0x87 > [ 19.535844] warn_alloc+0x114/0x1c0 > [ 19.536667] __alloc_pages_slowpath+0x9a6/0xba7 > [ 19.537491] ? sched_clock_cpu+0x11/0xb0 > [ 19.538311] __alloc_pages_nodemask+0x26a/0x290 > [ 19.539188] alloc_pages_current+0x6a/0xb0 > [ 19.540004] balloon_page_enqueue+0x25/0xf0 > [ 19.540818] update_balloon_size_func+0xe1/0x260 [virtio_balloon] >...

...ndard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 [ 238.341121] Call Trace: [ 238.341337] dump_stack+0x8f/0xd0 [ 238.341630] dump_header+0x61/0x5ea [ 238.341942] oom_kill_process.cold+0xb/0x10 [ 238.342299] out_of_memory+0x24d/0x5a0 [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 [ 238.343024] __alloc_pages_nodemask+0x391/0x410 [ 238.343407] pagecache_get_page+0xc3/0x3a0 [ 238.343757] filemap_fault+0x804/0xc30 [ 238.344083] ? ext4_filemap_fault+0x28/0x42 [ 238.344444] ext4_filemap_fault+0x30/0x42 [ 238.344789] __do_fault+0x37/0x1a0 [...

...e321-prebuilt.qemu4 > > [ 238.341121] Call Trace: > > [ 238.341337] dump_stack+0x8f/0xd0 > > [ 238.341630] dump_header+0x61/0x5ea > > [ 238.341942] oom_kill_process.cold+0xb/0x10 > > [ 238.342299] out_of_memory+0x24d/0x5a0 > > [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 > > [ 238.343024] __alloc_pages_nodemask+0x391/0x410 > > [ 238.343407] pagecache_get_page+0xc3/0x3a0 > > [ 238.343757] filemap_fault+0x804/0xc30 > > [ 238.344083] ? ext4_filemap_fault+0x28/0x42 > > [ 238.344444] ext4_filemap_fault+0x30/...

...ne, BIOS Hyper-V UEFI Release v1.0 11/26/2012 [762303.508357] Call Trace: [762303.508366] dump_stack+0x5c/0x7b [762303.508369] dump_header+0x6b/0x29c [762303.508371] oom_kill_process+0x272/0x280 [762303.508372] ? oom_badness+0x23/0x130 [762303.508374] out_of_memory+0x10c/0x480 [762303.508377] __alloc_pages_slowpath+0x9d8/0xdb0 [762303.508380] ? blk_mq_make_request+0x28a/0x530 [762303.508382] __alloc_pages_nodemask+0x258/0x2a0 [762303.508386] alloc_pages_vma+0x7c/0x1d0 [762303.508390] __read_swap_cache_async+0x147/0x200 [762303.508392] read_swap_cache_async+0x28/0x60 [762303.508394] swap_cluster_readahea...

...785.581212] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 > [ 785.581251] Workqueue: ceph-msgr ceph_con_workfn [libceph] > [ 785.581252] Call Trace: > [ 785.581255] <IRQ> > [ 785.581271] dump_stack+0x6d/0x95 > [ 785.581275] warn_alloc+0xfe/0x160 > [ 785.581277] __alloc_pages_slowpath+0xe07/0xe40 > [ 785.581282] ? dev_gro_receive+0x626/0x690 > [ 785.581284] __alloc_pages_nodemask+0x2cd/0x320 > [ 785.581287] alloc_pages_current+0x6a/0xe0 > [ 785.581298] skb_page_frag_refill+0xd4/0x100 > [ 785.581302] try_fill_recv+0x3ed/0x740 [virtio_net] > [ 785.5813...

..., BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 > [ 238.341121] Call Trace: > [ 238.341337] dump_stack+0x8f/0xd0 > [ 238.341630] dump_header+0x61/0x5ea > [ 238.341942] oom_kill_process.cold+0xb/0x10 > [ 238.342299] out_of_memory+0x24d/0x5a0 > [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 > [ 238.343024] __alloc_pages_nodemask+0x391/0x410 > [ 238.343407] pagecache_get_page+0xc3/0x3a0 > [ 238.343757] filemap_fault+0x804/0xc30 > [ 238.344083] ? ext4_filemap_fault+0x28/0x42 > [ 238.344444] ext4_filemap_fault+0x30/0x42 > [ 238.344789...

..., BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 > [ 238.341121] Call Trace: > [ 238.341337] dump_stack+0x8f/0xd0 > [ 238.341630] dump_header+0x61/0x5ea > [ 238.341942] oom_kill_process.cold+0xb/0x10 > [ 238.342299] out_of_memory+0x24d/0x5a0 > [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 > [ 238.343024] __alloc_pages_nodemask+0x391/0x410 > [ 238.343407] pagecache_get_page+0xc3/0x3a0 > [ 238.343757] filemap_fault+0x804/0xc30 > [ 238.344083] ? ext4_filemap_fault+0x28/0x42 > [ 238.344444] ext4_filemap_fault+0x30/0x42 > [ 238.344789...

..., BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu4 > [ 238.341121] Call Trace: > [ 238.341337] dump_stack+0x8f/0xd0 > [ 238.341630] dump_header+0x61/0x5ea > [ 238.341942] oom_kill_process.cold+0xb/0x10 > [ 238.342299] out_of_memory+0x24d/0x5a0 > [ 238.342625] __alloc_pages_slowpath+0xd12/0x1020 > [ 238.343024] __alloc_pages_nodemask+0x391/0x410 > [ 238.343407] pagecache_get_page+0xc3/0x3a0 > [ 238.343757] filemap_fault+0x804/0xc30 > [ 238.344083] ? ext4_filemap_fault+0x28/0x42 > [ 238.344444] ext4_filemap_fault+0x30/0x42 > [ 238.344789...