[Bug 101711] [chv] Heavy web pages makes rendering stuck for few minutes, or until web browser is terminated

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Jul 31 08:16:13 UTC 2019 

https://bugs.freedesktop.org/show_bug.cgi?id=101711

--- Comment #6 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
I believe I hit this yesterday too, without a too large working set, but with
lots of disk io instead.

I was only running ubuntu 19.04 + gnome-shell, no browser or anything open.
"free" said used was about 700MB of 2G of RAM. Still when copying a large file
I got a rendering hickup / stall in gnome-shell and this in dmesg:

[ 9594.079169] gnome-shell: page allocation failure: order:0,
mode:0x40810(GFP_NOWAIT|__GFP_COMP|__GFP_RECLAIMABLE),
nodemask=(null),cpuset=/,mems_allowed=0
[ 9594.079187] CPU: 3 PID: 1031 Comm: gnome-shell Tainted: G        WC       
5.1.0-994-generic #201905172204
[ 9594.079189] Hardware name: IRBIS TW90/Default string, BIOS
IRBIS12i.WT101P.JtBJRFA08 10/20/2017
[ 9594.079191] Call Trace:
[ 9594.079207]  dump_stack+0x63/0x8a
[ 9594.079213]  warn_alloc.cold.117+0x7b/0xfb
[ 9594.079219]  __alloc_pages_slowpath+0xe68/0xeb0
[ 9594.079225]  __alloc_pages_nodemask+0x2df/0x330
[ 9594.079231]  alloc_pages_current+0x81/0xe0
[ 9594.079235]  new_slab+0x337/0x740
[ 9594.079239]  ___slab_alloc+0x373/0x4f0
[ 9594.079353]  ? request_alloc_slow.isra.31+0x2f/0x5c [i915]
[ 9594.079427]  ? __i915_request_create+0x58/0x270 [i915]
[ 9594.079431]  ? __alloc_pages_nodemask+0x2df/0x330
[ 9594.079434]  __slab_alloc+0x20/0x40
[ 9594.079437]  kmem_cache_alloc+0x194/0x1c0
[ 9594.079510]  ? request_alloc_slow.isra.31+0x2f/0x5c [i915]
[ 9594.079584]  request_alloc_slow.isra.31+0x2f/0x5c [i915]
[ 9594.079655]  __i915_request_create+0x250/0x270 [i915]
[ 9594.079716]  __engine_park+0x91/0xc0 [i915]
[ 9594.079774]  __intel_wakeref_put_last+0x1c/0x50 [i915]
[ 9594.079834]  intel_engine_pm_put+0x40/0x50 [i915]
[ 9594.079894]  intel_context_exit_engine+0x19/0x20 [i915]
[ 9594.079958]  i915_request_retire+0x2ed/0x350 [i915]
[ 9594.080022]  ring_retire_requests+0x48/0x70 [i915]
[ 9594.080086]  i915_retire_requests+0x42/0x90 [i915]
[ 9594.080150]  i915_gem_shrink+0xb5/0x480 [i915]
[ 9594.080154]  ? __switch_to_asm+0x34/0x70
[ 9594.080218]  i915_gem_object_get_pages_gtt+0x1ab/0x6a0 [i915]
[ 9594.080283]  ? i915_vma_instance+0xd8/0x480 [i915]
[ 9594.080286]  ? prep_new_page+0x49/0x130
[ 9594.080349]  ____i915_gem_object_get_pages+0x22/0x40 [i915]
[ 9594.080412]  __i915_gem_object_get_pages+0x5b/0x70 [i915]
[ 9594.080477]  __i915_vma_do_pin+0x2d0/0x4e0 [i915]
[ 9594.080539]  eb_lookup_vmas+0x54b/0xba0 [i915]
[ 9594.080602]  i915_gem_do_execbuffer+0x466/0x1160 [i915]
[ 9594.080609]  ? xas_store+0x59/0x5c0
[ 9594.080617]  ? mem_cgroup_commit_charge+0x82/0x490
[ 9594.080620]  ? __kmalloc_node+0x1de/0x2b0
[ 9594.080697]  i915_gem_execbuffer2_ioctl+0x1c9/0x360 [i915]
[ 9594.080768]  ? i915_gem_execbuffer_ioctl+0x2b0/0x2b0 [i915]
[ 9594.080820]  drm_ioctl_kernel+0xb0/0x100 [drm]
[ 9594.080849]  drm_ioctl+0x233/0x410 [drm]
[ 9594.080920]  ? i915_gem_execbuffer_ioctl+0x2b0/0x2b0 [i915]
[ 9594.080926]  do_vfs_ioctl+0xa9/0x640
[ 9594.080930]  ? handle_mm_fault+0xe1/0x210
[ 9594.080933]  ksys_ioctl+0x67/0x90
[ 9594.080936]  __x64_sys_ioctl+0x1a/0x20
[ 9594.080943]  do_syscall_64+0x5a/0x110
[ 9594.080947]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9594.080951] RIP: 0033:0x7f69500a6417
[ 9594.080956] Code: 00 00 90 48 8b 05 79 0a 0d 00 64 c7 00 26 00 00 00 48 c7
c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d 49 0a 0d 00 f7 d8 64 89 01 48
[ 9594.080959] RSP: 002b:00007fff860cf8c8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 9594.080962] RAX: ffffffffffffffda RBX: 000055fa530c4980 RCX:
00007f69500a6417
[ 9594.080964] RDX: 00007fff860cf910 RSI: 0000000040406469 RDI:
000000000000000b
[ 9594.080966] RBP: 00007fff860cf910 R08: 000055fa531049e0 R09:
00007f694311b010
[ 9594.080968] R10: 00007fff860cf900 R11: 0000000000000246 R12:
0000000040406469
[ 9594.080969] R13: 000000000000000b R14: ffffffffffffffff R15:
0000000000000000
[ 9594.080973] Mem-Info:
[ 9594.080983] active_anon:43723 inactive_anon:53610 isolated_anon:0
                active_file:44649 inactive_file:239254 isolated_file:0
                unevictable:10371 dirty:136 writeback:0 unstable:0
                slab_reclaimable:17485 slab_unreclaimable:25259
                mapped:28815 shmem:26900 pagetables:3257 bounce:0
                free:37391 free_pcp:378 free_cma:0
[ 9594.080989] Node 0 active_anon:174892kB inactive_anon:214440kB
active_file:178596kB inactive_file:957016kB unevictable:41484kB
isolated(anon):0kB isolated(file):0kB mapped:115260kB dirty:544kB writeback:0kB
shmem:107600kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB
writeback_tmp:0kB unstable:0kB all_unreclaimable? no
[ 9594.080992] Node 0 DMA free:7788kB min:372kB low:464kB high:556kB
active_anon:96kB inactive_anon:436kB active_file:904kB inactive_file:4884kB
unevictable:832kB writepending:0kB present:15984kB managed:15896kB mlocked:0kB
kernel_stack:16kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB
free_cma:0kB
[ 9594.081000] lowmem_reserve[]: 0 1857 1857 1857 1857
[ 9594.081004] Node 0 DMA32 free:141776kB min:142984kB low:154152kB
high:165320kB active_anon:174796kB inactive_anon:213900kB active_file:177756kB
inactive_file:952080kB unevictable:40560kB writepending:512kB present:2008988kB
managed:1950576kB mlocked:48kB kernel_stack:7680kB pagetables:13028kB
bounce:0kB free_pcp:1512kB local_pcp:428kB free_cma:0kB
[ 9594.081011] lowmem_reserve[]: 0 0 0 0 0
[ 9594.081014] Node 0 DMA: 85*4kB (UM) 47*8kB (UM) 22*16kB (UM) 12*32kB (UM)
9*64kB (UM) 7*128kB (U) 5*256kB (UME) 3*512kB (UME) 0*1024kB 1*2048kB (M)
0*4096kB = 7788kB
[ 9594.081030] Node 0 DMA32: 3068*4kB (UMH) 3382*8kB (UMEH) 1547*16kB (UMEH)
1206*32kB (UMH) 455*64kB (UM) 78*128kB (ME) 0*256kB 0*512kB 0*1024kB 0*2048kB
0*4096kB = 141776kB
[ 9594.081048] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
hugepages_size=2048kB
[ 9594.081050] 313991 total pagecache pages
[ 9594.081054] 3125 pages in swap cache
[ 9594.081056] Swap cache stats: add 132061, delete 128936, find 37320/43049
[ 9594.081057] Free swap  = 2673404kB
[ 9594.081058] Total swap = 2942972kB
[ 9594.081059] 506243 pages RAM
[ 9594.081061] 0 pages HighMem/MovableOnly
[ 9594.081062] 14625 pages reserved
[ 9594.081063] 0 pages cma reserved
[ 9594.081064] 0 pages hwpoisoned
[ 9594.081068] SLUB: Unable to allocate memory on node -1,
gfp=0x800(GFP_NOWAIT)
[ 9594.081071]   cache: i915_request, object size: 584, buffer size: 640,
default order: 2, min order: 0
[ 9594.081074]   node 0: slabs: 1, objs: 25, free: 0


Which indicates that even if the working set is ok, doing some diskio (this was
copying a large file to a microsd, so not very high speed io) which fills the
buffers can cause this too.

I guess in this case the problem was that the file source (eMMC) was probably
faster then the destination leading to lots of dirty write buffers...

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