Hi, I'm seeing a new problem with kernel 5.7.0 I haven't previously seen. I am testing both swap on /dev/zram and swap on a partition. Two swaps. The workload is compiling webkitgtk with defaults, which is slightly overcommitted for the resources. I'm actually expecting oom. But that's not what happens. After about 2 hours the whole thing just splats. Bug report here with dmesg and meminfo attached. Partial below. https://bugzilla.kernel.org/show_bug.cgi?id=208085 MemTotal: 8052740 kB SwapTotal: 14908572 kB $ swapon NAME TYPE SIZE USED PRIO /dev/sda5 partition 10.4G 4.4M -2 /dev/zram0 partition 3.9G 241M 3 $ There are multiple splats, this is one of them. [ 5225.501756] gnome-shell: page allocation failure: order:0, mode:0x400d0(__GFP_IO|__GFP_FS|__GFP_COMP|__GFP_RECLAIMABLE), nodemask=(null),cpuset=/,mems_allowed=0 [ 5225.501763] CPU: 2 PID: 1155 Comm: gnome-shell Not tainted 5.7.0-1.fc33.x86_64 #1 [ 5225.501764] Hardware name: Apple Inc. MacBookPro8,2/Mac-94245A3940C91C80, BIOS MBP81.88Z.0050.B00.1804101331 04/10/18 [ 5225.501765] Call Trace: [ 5225.501774] dump_stack+0x64/0x88 [ 5225.501777] warn_alloc.cold+0x75/0xd9 [ 5225.501781] __alloc_pages_slowpath.constprop.0+0xcfa/0xd30 [ 5225.501785] ? alloc_slab_page+0x195/0x310 [ 5225.501786] __alloc_pages_nodemask+0x2df/0x320 [ 5225.501787] alloc_slab_page+0x195/0x310 [ 5225.501789] allocate_slab+0x3c5/0x440 [ 5225.501791] ___slab_alloc+0x40c/0x5f0 [ 5225.501793] ? xas_nomem+0x28/0x70 [ 5225.501795] ? xas_alloc+0x9b/0xc0 [ 5225.501797] ? xas_nomem+0x28/0x70 [ 5225.501798] __slab_alloc+0x1c/0x30 [ 5225.501800] kmem_cache_alloc+0x20e/0x220 [ 5225.501802] xas_nomem+0x28/0x70 [ 5225.501803] add_to_swap_cache+0x321/0x400 [ 5225.501806] __read_swap_cache_async+0x105/0x240 [ 5225.501808] swap_cluster_readahead+0x22c/0x2e0 [ 5225.501811] shmem_swapin+0x8e/0xc0 [ 5225.501812] ? kmem_cache_free+0x174/0x190 [ 5225.501814] ? xas_store+0x33a/0x5e0 [ 5225.501817] shmem_swapin_page+0x196/0x740 [ 5225.501819] shmem_getpage_gfp+0x3a2/0xa60 [ 5225.501822] shmem_read_mapping_page_gfp+0x32/0x60 [ 5225.501868] shmem_get_pages+0x155/0x5e0 [i915] [ 5225.501874] ? __queue_work+0x1e3/0x410 [ 5225.501897] ? add_hole+0x115/0x170 [drm] [ 5225.501927] ? fence_notify+0x86/0x104 [i915] [ 5225.501954] ? __i915_sw_fence_complete+0x10f/0x1c0 [i915] [ 5225.501987] __i915_gem_object_get_pages+0x68/0xa0 [i915] [ 5225.502022] i915_vma_pin+0x3fe/0x6c0 [i915] [ 5225.502056] eb_add_vma+0x10b/0x2c0 [i915] [ 5225.502089] i915_gem_do_execbuffer+0x704/0x3430 [i915] [ 5225.502094] ? blk_account_io_start+0xda/0x140 [ 5225.502096] ? bio_attempt_back_merge+0x83/0xe0 [ 5225.502098] ? blk_attempt_plug_merge+0x10c/0x110 [ 5225.502102] ? bfq_update_fin_time_enqueue+0x13d/0x1a0 [ 5225.502106] ? idling_needed_for_service_guarantees+0x3f/0x70 [ 5225.502108] ? bfq_better_to_idle+0x73/0x90 [ 5225.502110] ? bfq_dispatch_request+0x6ce/0x1070 [ 5225.502113] ? bfq_add_bfqq_busy+0xa1/0x162 [ 5225.502117] ? __blk_mq_run_hw_queue+0x49/0x110 [ 5225.502121] ? __alloc_pages_slowpath.constprop.0+0x15b/0xd30 [ 5225.502124] ? generic_end_io_acct+0x91/0xf0 [ 5225.502127] ? sched_clock+0x5/0x10 [ 5225.502131] ? sched_clock_cpu+0xc/0xa0 [ 5225.502134] ? _cond_resched+0x16/0x40 [ 5225.502136] ? __kmalloc_node+0x204/0x300 [ 5225.502168] ? i915_gem_execbuffer2_ioctl+0x93/0x3e0 [i915] [ 5225.502201] i915_gem_execbuffer2_ioctl+0x1ea/0x3e0 [i915] [ 5225.502204] ? reuse_swap_page+0x8c/0x380 [ 5225.502238] ? i915_gem_execbuffer_ioctl+0x2a0/0x2a0 [i915] [ 5225.502253] drm_ioctl_kernel+0x86/0xd0 [drm] [ 5225.502257] ? avc_has_perm+0x3b/0x160 [ 5225.502272] drm_ioctl+0x206/0x390 [drm] [ 5225.502306] ? i915_gem_execbuffer_ioctl+0x2a0/0x2a0 [i915] [ 5225.502311] ksys_ioctl+0x82/0xc0 [ 5225.502313] __x64_sys_ioctl+0x16/0x20 [ 5225.502317] do_syscall_64+0x5b/0xf0 [ 5225.502320] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 5225.502323] RIP: 0033:0x7ff76292047b [ 5225.502326] Code: 0f 1e fa 48 8b 05 1d aa 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed a9 0c 00 f7 d8 64 89 01 48 [ 5225.502328] RSP: 002b:00007fff75aed128 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 5225.502330] RAX: ffffffffffffffda RBX: 00007fff75aed170 RCX: 00007ff76292047b [ 5225.502332] RDX: 00007fff75aed170 RSI: 0000000040406469 RDI: 000000000000000d [ 5225.502334] RBP: 0000000040406469 R08: 000000000000000d R09: 000055ff644b09a0 [ 5225.502335] R10: 0000000000000000 R11: 0000000000000246 R12: 000055ff6446c760 [ 5225.502336] R13: 000000000000000d R14: ffffffffffffffff R15: 00007ff74af22828 [ 5225.502339] Mem-Info: [ 5225.502345] active_anon:1433763 inactive_anon:207289 isolated_anon:182 active_file:10333 inactive_file:8393 isolated_file:2 unevictable:4657 dirty:100 writeback:0 unstable:0 slab_reclaimable:16672 slab_unreclaimable:38093 mapped:8919 shmem:4496 pagetables:10454 bounce:0 free:26161 free_pcp:2054 free_cma:0 [ 5225.502350] Node 0 active_anon:5735052kB inactive_anon:829156kB active_file:41332kB inactive_file:33572kB unevictable:18628kB isolated(anon):728kB isolated(file):8kB mapped:35676kB dirty:400kB writeback:0kB shmem:17984kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no [ 5225.502352] Node 0 DMA free:15344kB min:128kB low:160kB high:192kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15360kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB [ 5225.502357] lowmem_reserve[]: 0 2069 7810 7810 7810 [ 5225.502360] Node 0 DMA32 free:40212kB min:17868kB low:22332kB high:26796kB reserved_highatomic:0KB active_anon:1640016kB inactive_anon:265148kB active_file:9856kB inactive_file:12584kB unevictable:2968kB writepending:136kB present:2255864kB managed:2157904kB mlocked:0kB kernel_stack:48kB pagetables:8524kB bounce:0kB free_pcp:2904kB local_pcp:156kB free_cma:0kB [ 5225.502365] lowmem_reserve[]: 0 0 5741 5741 5741 [ 5225.502368] Node 0 Normal free:49088kB min:49584kB low:61980kB high:74376kB reserved_highatomic:2048KB active_anon:4098076kB inactive_anon:563004kB active_file:32212kB inactive_file:21312kB unevictable:13680kB writepending:0kB present:6027264kB managed:5879476kB mlocked:1792kB kernel_stack:7312kB pagetables:33292kB bounce:0kB free_pcp:5388kB local_pcp:780kB free_cma:0kB [ 5225.502373] lowmem_reserve[]: 0 0 0 0 0 [ 5225.502376] Node 0 DMA: 0*4kB 0*8kB 1*16kB (U) 1*32kB (U) 1*64kB (U) 1*128kB (U) 1*256kB (U) 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 15344kB [ 5225.502385] Node 0 DMA32: 1160*4kB (UM) 471*8kB (UME) 84*16kB (UM) 103*32kB (UME) 116*64kB (UME) 59*128kB (UME) 26*256kB (UE) 8*512kB (E) 2*1024kB (E) 0*2048kB 0*4096kB = 40824kB [ 5225.502394] Node 0 Normal: 4778*4kB (UMH) 1400*8kB (UMEH) 346*16kB (UMH) 270*32kB (UMEH) 20*64kB (UMEH) 20*128kB (MEH) 4*256kB (MEH) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 49352kB [ 5225.502404] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB [ 5225.502405] 114228 total pagecache pages [ 5225.502408] 90616 pages in swap cache [ 5225.502410] Swap cache stats: add 52638812, delete 52548141, find 2182667/30436788 [ 5225.502411] Free swap = 5921200kB [ 5225.502413] Total swap = 14908572kB [ 5225.502414] 2074779 pages RAM [ 5225.502415] 0 pages HighMem/MovableOnly [ 5225.502416] 61594 pages reserved [ 5225.502417] 0 pages cma reserved [ 5225.502418] 0 pages hwpoisoned [ 5225.502420] SLUB: Unable to allocate memory on node -1, gfp=0xc0(__GFP_IO|__GFP_FS) [ 5225.502422] cache: radix_tree_node, object size: 576, buffer size: 584, default order: 2, min order: 0 [ 5225.502424] node 0: slabs: 654, objs: 11886, free: 0 -- Chris Murphy
