Re: [PATCH v3] zram: don't free statically defined names

Chris Li
2024-09-24T18:29:59Z

On Tue, Sep 24, 2024 at 8:56 AM Chris Li <chrisl@kernel.org> wrote:
>
> Hi,
>
> I also hit this problem in my swap stress test. Sergey pointed me to
> this thread.
>
> Just want to add that the fixes works for my setup as well:
>
> Tested-by: Chris Li <chrisl@kernel.org>

I am very sorry that I sent the email out too soon. I should have
waited for the swap stress test to complete first.
It turns out that, with this fix, the initial warning and BUG()
disappeared. However, my swap stress test failed with OOM kill about
20 seconds into the test. Given the first 15 seconds or so is
extracting the kernel source, it seems that as soon as the 32 compile
jobs started I got the oom kill. I need to withdraw that Tested-by
tag.

I have run the test twice with this fix, the oom kill is reproducible
in each run. I also double checked the mm-stable commit before this
(effectively revert this commit rather than fixing it). The swap
stress test passed without any issue.
Given the merge window is closing. I suggest just reverting this
change. As it is the fix also causing regression in the swap stress
test for me. It is possible that is my test setup issue, but reverting
sounds the safe bet.

Here is the kernel dmesg of the oom:

[ 64.191987] zswap: loaded using pool lzo/zsmalloc
[ 64.280184] zram0: detected capacity change from 16777216 to 0
[ 64.286990] zram: Removed device: zram0 <======================= no
warning here any more
[ 64.343738] zram: Added device: zram0
[ 64.372215] zram: Added device: zram1
[ 64.469525] zram0: detected capacity change from 0 to 6553600
[ 64.532199] zram1: detected capacity change from 0 to 40960000
[ 64.640701] Adding 3276796k swap on /dev/zram0. Priority:100
extents:1 across:3276796k SS
[ 64.675277] Adding 20479996k swap on /dev/zram1. Priority:0
extents:1 across:20479996k SS
[ 81.623460] cc1 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL),
order=0, oom_score_adj=0
[ 81.624056] CPU: 64 UID: 1000 PID: 5646 Comm: cc1 Tainted: G S
6.11.0-rc6+ #34
[ 81.628794] Tainted: [S]=CPU_OUT_OF_SPEC
[ 81.629016] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360
Gen9, BIOS P89 09/21/2023
[ 81.629422] Call Trace:
[ 81.629564] <TASK>
[ 81.633896] dump_stack_lvl+0x5d/0x80
[ 81.634167] dump_header+0x44/0x18d
[ 81.638557] oom_kill_process.cold+0xa/0xaa
[ 81.638778] out_of_memory+0x219/0x4b0
[ 81.638995] mem_cgroup_out_of_memory+0x12d/0x160
[ 81.643485] try_charge_memcg+0x488/0x630
[ 81.643728] __mem_cgroup_charge+0x42/0xd0
[ 81.643949] do_anonymous_page+0x32a/0x8b0
[ 81.644162] ? __pte_offset_map+0x1b/0x180
[ 81.644375] __handle_mm_fault+0xb34/0xfb0
[ 81.644588] handle_mm_fault+0xe2/0x2c0
[ 81.644823] do_user_addr_fault+0x2ca/0x7b0
[ 81.645040] exc_page_fault+0x7e/0x180
[ 81.645254] asm_exc_page_fault+0x26/0x30
[ 81.645467] RIP: 0033:0x7f892250c407
[ 81.645967] Code: 3e 0e 08 00 01 74 9c 83 f9 c0 0f 87 7e fe ff ff
c5 fe 6f 4e 20 48 29 fe 48 83 c7 3f 49 8d 0c 10 48 8
3 e7 c0 48 01 fe 48 29 f9 <f3> a4 c4 c1 7e 7f 00 c4 c1 7e 7f 48 20 c5
f8 77 c3 0f 1f 84 00 00
[ 81.651207] RSP: 002b:00007ffc4aa3a5f8 EFLAGS: 00010206
[ 81.651499] RAX: 00000000195aa850 RBX: 000000001949bd60 RCX: 0000000000001858
[ 81.656091] RDX: 0000000000008008 RSI: 00000000194a2520 RDI: 00000000195b1000
[ 81.660702] RBP: 00007ffc4aa3a640 R08: 00000000195aa850 R09: 0000000000000001
[ 81.665385] R10: 00000000195aa840 R11: 00000000195b9000 R12: 0000000000008010
[ 81.670185] R13: 00000000195aa850 R14: 0000000000010010 R15: 00007f8922586ac0
[ 81.674802] </TASK>
[ 81.674970] memory: usage 481280kB, limit 481280kB, failcnt 9260
[ 81.679505] swap: usage 171812kB, limit 9007199254740988kB, failcnt 0
[ 81.679924] Memory cgroup stats for /build-kernel-tmpfs:
[ 81.687282] anon 443244544
[ 81.723088] file 25722880
[ 81.727808] kernel 23789568
[ 81.727963] kernel_stack 2490368
[ 81.732353] pagetables 11616256
[ 81.736751] sec_pagetables 0
[ 81.741145] percpu 188256
[ 81.741307] sock 0
[ 81.745628] vmalloc 0
[ 81.745844] shmem 1302528
[ 81.745983] zswap 0
[ 81.750314] zswapped 0
[ 81.750477] file_mapped 18034688
[ 81.754869] file_dirty 0
[ 81.755029] file_writeback 0
[ 81.759807] swapcached 2109440
[ 81.764557] anon_thp 249561088
[ 81.769449] file_thp 0
[ 81.770044] shmem_thp 0
[ 81.770747] inactive_anon 64327680
[ 81.775654] active_anon 379654144
[ 81.780542] inactive_file 4321280
[ 81.785362] active_file 20099072
[ 81.790348] unevictable 0
[ 81.790914] slab_reclaimable 794232
[ 81.795728] slab_unreclaimable 7392640
[ 81.796394] slab 8186872
[ 81.796960] workingset_refault_anon 5287
[ 81.797820] workingset_refault_file 580
[ 81.798465] workingset_activate_anon 2898
[ 81.799097] workingset_activate_file 539
[ 81.799717] workingset_restore_anon 2871
[ 81.800337] workingset_restore_file 538
[ 81.800936] workingset_nodereclaim 0
[ 81.801578] pgdemote_kswapd 0
[ 81.806357] pgdemote_direct 0
[ 81.811214] pgdemote_khugepaged 0
[ 81.820714] pgscan 130203
[ 81.821234] pgsteal 52640
[ 81.821745] pgscan_kswapd 0
[ 81.822268] pgscan_direct 130203
[ 81.827039] pgscan_khugepaged 0
[ 81.831786] pgsteal_kswapd 0
[ 81.836529] pgsteal_direct 52640
[ 81.841303] pgsteal_khugepaged 0
[ 81.846070] pgfault 1001627
[ 81.846568] pgmajfault 5856
[ 81.847106] pgrefill 146480
[ 81.847604] pgactivate 26070
[ 81.852395] pgdeactivate 0
[ 81.852923] pglazyfree 0
[ 81.853552] pglazyfreed 0
[ 81.854013] zswpin 0
[ 81.854468] zswpout 0
[ 81.855157] zswpwb 0
[ 81.855595] thp_fault_alloc 498
[ 81.860352] thp_collapse_alloc 0
[ 81.865086] thp_swpout 1
[ 81.865567] thp_swpout_fallback 0
[ 81.870312] numa_pages_migrated 0
[ 81.875015] numa_pte_updates 10760
[ 81.879669] numa_hint_faults 21
[ 81.884307] Tasks state (memory values in pages):
[ 81.889021] [ pid ] uid tgid total_vm rss rss_anon
rss_file rss_shmem pgtables_bytes swapents oom_score_adj
name
[ 81.889895] [ 2025] 1000 2025 1795 450 0
450 0 61440 0 0 kbench
[ 81.891180] [ 4734] 1000 4734 636 299 0
299 0 49152 0 0 time
[ 81.891953] [ 4735] 1000 4735 3071 751 0
751 0 73728 0 0 make
[ 81.892763] [ 4736] 1000 4736 2706 1034 288
746 0 73728 0 0 make
[ 81.893571] [ 5515] 1000 5515 2701 1052 288
764 0 65536 0 0 make
[ 81.894311] [ 5519] 1000 5519 2559 897 144
753 0 65536 0 0 make
[ 81.895093] [ 5520] 1000 5520 2547 884 144
740 0 57344 0 0 make
[ 81.895844] [ 5522] 1000 5522 2547 884 144
740 0 57344 0 0 make
[ 81.896635] [ 5524] 1000 5524 2547 900 144
756 0 61440 0 0 make
[ 81.897430] [ 5525] 1000 5525 2551 891 144
747 0 61440 0 0 make
[ 81.898354] [ 5526] 1000 5526 2569 888 144
744 0 65536 0 0 make
[ 81.899172] [ 5527] 1000 5527 2570 904 144
760 0 53248 0 0 make
[ 81.900023] [ 5528] 1000 5528 2540 898 144
754 0 61440 0 0 make
[ 81.900827] [ 5530] 1000 5530 2544 874 144
730 0 61440 0 0 make
[ 81.901631] [ 5532] 1000 5532 2581 890 144
746 0 57344 0 0 make
[ 81.902463] [ 5536] 1000 5536 2546 890 144
746 0 61440 0 0 make
[ 81.903303] [ 5537] 1000 5537 2544 892 144
748 0 69632 0 0 make
[ 81.904128] [ 5538] 1000 5538 1798 744 0
744 0 57344 0 0 sh
[ 81.909083] [ 5540] 1000 5540 2581 891 144
747 0 61440 0 0 make
[ 81.909846] [ 5541] 1000 5541 1797 751 0
751 0 49152 0 0 sh
[ 81.914803] [ 5543] 1000 5543 2544 886 144
742 0 65536 0 0 make
[ 81.915581] [ 5545] 1000 5545 2545 890 144
746 0 53248 0 0 make
[ 81.916393] [ 5548] 1000 5548 2547 903 144
759 0 69632 0 0 make
[ 81.917275] [ 5550] 1000 5550 1798 742 0
742 0 53248 0 0 sh
[ 81.922333] [ 5551] 1000 5551 2539 888 144
744 0 53248 0 0 make
[ 81.923198] [ 5552] 1000 5552 2539 888 144
744 0 61440 0 0 make
[ 81.924037] [ 5553] 1000 5553 1282 767 0
767 0 49152 0 0 gcc
[ 81.929034] [ 5556] 1000 5556 2541 893 144
749 0 57344 0 0 make
[ 81.929831] [ 5557] 1000 5557 2539 896 144
752 0 57344 0 0 make
[ 81.930624] [ 5561] 1000 5561 1282 753 0
753 0 45056 0 0 gcc
[ 81.935632] [ 5562] 1000 5562 1798 764 0
764 0 53248 0 0 sh
[ 81.940609] [ 5563] 1000 5563 2573 907 144
763 0 61440 0 0 make
[ 81.941409] [ 5565] 1000 5565 1798 750 0
750 0 53248 0 0 sh
[ 81.946403] [ 5566] 1000 5566 2544 902 144
758 0 53248 0 0 make
[ 81.947214] [ 5569] 1000 5569 2542 888 144
744 0 53248 0 0 make
[ 81.947991] [ 5572] 1000 5572 1282 755 0
755 0 49152 0 0 gcc
[ 81.952957] [ 5573] 1000 5573 1798 764 0
764 0 53248 0 0 sh
[ 81.957974] [ 5574] 1000 5574 2539 896 144
752 0 61440 0 0 make
[ 81.958816] [ 5575] 1000 5575 2540 880 144
736 0 65536 0 0 make
[ 81.959657] [ 5576] 1000 5576 13008 7927 2771
5156 0 131072 0 0 cc1
[ 81.964615] [ 5578] 1000 5578 15729 8291 5119
3172 0 151552 0 0 cc1
[ 81.969617] [ 5581] 1000 5581 1798 742 0
742 0 53248 0 0 sh
[ 81.974649] [ 5582] 1000 5582 1282 601 0
601 0 45056 0 0 gcc
[ 81.979839] [ 5584] 1000 5584 1798 746 0
746 0 57344 0 0 sh
[ 81.984885] [ 5585] 1000 5585 1798 744 0
744 0 57344 0 0 sh
[ 81.989933] [ 5589] 1000 5589 1798 750 0
750 0 45056 0 0 sh
[ 81.994984] [ 5591] 1000 5591 2514 888 144
744 0 61440 0 0 make
[ 81.995852] [ 5597] 1000 5597 1798 744 0
744 0 53248 0 0 sh
[ 82.000886] [ 5598] 1000 5598 14686 7403 4243
3160 0 143360 0 0 cc1
[ 82.005980] [ 5600] 1000 5600 1282 765 0
765 0 45056 0 0 gcc
[ 82.011122] [ 5602] 1000 5602 1798 754 0
754 0 61440 0 0 sh
[ 82.016151] [ 5603] 1000 5603 1282 735 0
735 0 49152 0 0 gcc
[ 82.021250] [ 5604] 1000 5604 1282 765 0
765 0 45056 0 0 gcc
[ 82.026367] [ 5605] 1000 5605 1798 750 0
750 0 57344 0 0 sh
[ 82.031423] [ 5606] 1000 5606 1798 742 0
742 0 57344 0 0 sh
[ 82.036506] [ 5608] 1000 5608 15456 7968 4812
3156 0 151552 0 0 cc1
[ 82.041749] [ 5611] 1000 5611 1798 762 0
762 0 57344 0 0 sh
[ 82.046785] [ 5613] 1000 5613 1282 764 0
764 0 45056 0 0 gcc
[ 82.051923] [ 5614] 1000 5614 1798 745 0
745 0 57344 0 0 sh
[ 82.056956] [ 5616] 1000 5616 1798 734 0
734 0 53248 0 0 sh
[ 82.062176] [ 5622] 1000 5622 1282 746 0
746 0 45056 0 0 gcc
[ 82.067474] [ 5623] 1000 5623 1282 605 0
605 0 45056 0 0 gcc
[ 82.072487] [ 5624] 1000 5624 1798 748 0
748 0 57344 0 0 sh
[ 82.077553] [ 5628] 1000 5628 1282 753 0
753 0 53248 0 0 gcc
[ 82.082633] [ 5629] 1000 5629 14716 7401 4241
3160 0 143360 0 0 cc1
[ 82.087642] [ 5630] 1000 5630 14614 7064 3922
3142 0 147456 0 0 cc1
[ 82.092661] [ 5633] 1000 5633 14588 6926 3779
3147 0 143360 0 0 cc1
[ 82.097685] [ 5635] 1000 5635 1282 616 0
616 0 49152 0 0 gcc
[ 82.102675] [ 5636] 1000 5636 1282 765 0
765 0 53248 0 0 gcc
[ 82.107729] [ 5637] 1000 5637 1282 748 0
748 0 45056 0 0 gcc
[ 82.112810] [ 5638] 1000 5638 1798 745 0
745 0 53248 0 0 sh
[ 82.117833] [ 5639] 1000 5639 14575 7105 3919
3186 0 147456 0 0 cc1
[ 82.122838] [ 5640] 1000 5640 1282 755 0
755 0 49152 0 0 gcc
[ 82.127866] [ 5642] 1000 5642 1282 753 0
753 0 49152 0 0 gcc
[ 82.132897] [ 5644] 1000 5644 1798 745 0
745 0 53248 0 0 sh
[ 82.137960] [ 5646] 1000 5646 15823 8639 5463
3176 0 151552 0 0 cc1
[ 82.142999] [ 5648] 1000 5648 1282 767 0
767 0 45056 0 0 gcc
[ 82.147955] [ 5651] 1000 5651 1798 750 0
750 0 45056 0 0 sh
[ 82.152953] [ 5652] 1000 5652 1282 752 0
752 0 45056 0 0 gcc
[ 82.157964] [ 5653] 1000 5653 14026 6214 3199
3015 0 139264 0 0 cc1
[ 82.162975] [ 5654] 1000 5654 1798 742 0
742 0 61440 0 0 sh
[ 82.167970] [ 5657] 1000 5657 14119 6858 3684
3174 0 143360 0 0 cc1
[ 82.173140] [ 5660] 1000 5660 1798 740 0
740 0 53248 0 0 sh
[ 82.178178] [ 5661] 1000 5661 15751 8608 5422
3186 0 159744 0 0 cc1
[ 82.183201] [ 5662] 1000 5662 14093 6976 3823
3153 0 143360 0 0 cc1
[ 82.188343] [ 5663] 1000 5663 1282 767 0
767 0 49152 0 0 gcc
[ 82.193338] [ 5665] 1000 5665 15863 8524 5354
3170 0 159744 0 0 cc1
[ 82.198390] [ 5667] 1000 5667 1282 754 0
754 0 40960 0 0 gcc
[ 82.203440] [ 5668] 1000 5668 14076 6269 3251
3018 0 139264 0 0 cc1
[ 82.208471] [ 5669] 1000 5669 14083 6713 3555
3158 0 143360 0 0 cc1
[ 82.213507] [ 5671] 1000 5671 1798 599 0
599 0 53248 0 0 sh
[ 82.218523] [ 5676] 1000 5676 13444 5798 2781
3017 0 147456 0 0 cc1
[ 82.223549] [ 5677] 1000 5677 15181 7544 4389
3155 0 151552 0 0 cc1
[ 82.228575] [ 5679] 1000 5679 1282 753 0
753 0 40960 0 0 gcc
[ 82.233629] [ 5683] 1000 5683 1282 755 0
755 0 45056 0 0 gcc
[ 82.238641] [ 5684] 1000 5684 1282 767 0
767 0 40960 0 0 gcc
[ 82.243633] [ 5685] 1000 5685 14670 7640 4464
3176 0 143360 0 0 cc1
[ 82.248681] [ 5686] 1000 5686 14601 6845 3670
3175 0 147456 0 0 cc1
[ 82.253827] [ 5687] 1000 5687 1798 735 0
735 0 57344 0 0 sh
[ 82.258819] [ 5690] 1000 5690 1282 753 0
753 0 40960 0 0 gcc
[ 82.263841] [ 5692] 1000 5692 14024 6379 3366
3013 0 143360 0 0 cc1
[ 82.268966] [ 5693] 1000 5693 1798 741 0
741 0 53248 0 0 sh
[ 82.274000] [ 5697] 1000 5697 15288 7953 4794
3159 0 147456 0 0 cc1
[ 82.278987] [ 5699] 1000 5699 14042 6225 3211
3014 0 143360 0 0 cc1
[ 82.283986] [ 5702] 1000 5702 14653 7386 4202
3184 0 151552 0 0 cc1
[ 82.288984] [ 5705] 1000 5705 1282 767 0
767 0 45056 0 0 gcc
[ 82.294075] [ 5707] 1000 5707 1282 767 0
767 0 45056 0 0 gcc
[ 82.299067] [ 5715] 1000 5715 14684 6882 3852
3030 0 147456 0 0 cc1
[ 82.304088] [ 5716] 1000 5716 14091 6713 3679
3034 0 139264 0 0 cc1
[ 82.309082] [ 5737] 1000 5737 1798 740 0
740 0 49152 0 0 sh
[ 82.314109] [ 5744] 1000 5744 1798 749 0
749 0 61440 0 0 sh
[ 82.319327] [ 5751] 1000 5751 1282 767 0
767 0 40960 0 0 gcc
[ 82.324397] [ 5753] 1000 5753 1282 767 0
767 0 45056 0 0 gcc
[ 82.329414] [ 5755] 1000 5755 1798 759 0
759 0 61440 0 0 sh
[ 82.334384] [ 5765] 1000 5765 13431 5815 2962
2853 0 139264 0 0 cc1
[ 82.339405] [ 5767] 1000 5767 13614 5959 2968
2991 0 147456 0 0 cc1
[ 82.344380] [ 5768] 1000 5768 1798 764 0
764 0 53248 0 0 sh
[ 82.349390] [ 5771] 1000 5771 1282 764 0
764 0 49152 0 0 gcc
[ 82.354401] [ 5778] 1000 5778 1282 754 0
754 0 45056 0 0 gcc
[ 82.359462] [ 5780] 1000 5780 1798 748 0
748 0 57344 0 0 sh
[ 82.364494] [ 5781] 1000 5781 13423 5798 2655
3143 0 135168 0 0 cc1
[ 82.369477] [ 5785] 1000 5785 2545 891 144
747 0 61440 0 0 make
[ 82.370307] [ 5787] 1000 5787 12900 7513 2549
4964 0 139264 0 0 cc1
[ 82.375365] [ 5788] 1000 5788 1282 767 0
767 0 45056 0 0 gcc
[ 82.380409] [ 5793] 1000 5793 13305 5367 2369
2998 0 135168 0 0 cc1
[ 82.385768] [ 5808] 1000 5808 1798 757 0
757 0 53248 0 0 sh
[ 82.391002] [ 5814] 1000 5814 1798 742 0
742 0 57344 0 0 sh
[ 82.395991] [ 5817] 1000 5817 1282 607 0
607 0 45056 0 0 gcc
[ 82.400970] [ 5818] 1000 5818 1798 746 0
746 0 49152 0 0 sh
[ 82.405978] [ 5820] 1000 5820 1282 753 0
753 0 45056 0 0 gcc
[ 82.411029] [ 5825] 1000 5825 12584 4814 1930
2884 0 131072 0 0 cc1
[ 82.416092] [ 5826] 1000 5826 13449 5961 2946
3015 0 135168 0 0 cc1
[ 82.421135] [ 5827] 1000 5827 1282 767 0
767 0 49152 0 0 gcc
[ 82.426206] [ 5832] 1000 5832 14026 6102 3106
2996 0 139264 0 0 cc1
[ 82.431209] [ 5836] 1000 5836 2541 888 144
744 0 61440 0 0 make
[ 82.432102] [ 5849] 1000 5849 1798 742 0
742 0 49152 0 0 sh
[ 82.437079] [ 5853] 1000 5853 1282 755 0
755 0 49152 0 0 gcc
[ 82.442106] [ 5854] 1000 5854 1798 746 0
746 0 53248 0 0 sh
[ 82.447138] [ 5855] 1000 5855 1798 754 0
754 0 57344 0 0 sh
[ 82.452189] [ 5857] 1000 5857 12542 4766 1920
2846 0 126976 0 0 cc1
[ 82.457330] [ 5859] 1000 5859 1282 607 0
607 0 45056 0 0 gcc
[ 82.462329] [ 5860] 1000 5860 1282 767 0
767 0 45056 0 0 gcc
[ 82.467376] [ 5863] 1000 5863 11918 4284 1584
2700 0 122880 0 0 cc1
[ 82.472418] [ 5864] 1000 5864 12782 5213 2353
2860 0 131072 0 0 cc1
[ 82.477480] [ 5866] 1000 5866 1798 762 0
762 0 49152 0 0 sh
[ 82.482511] [ 5867] 1000 5867 1282 753 0
753 0 49152 0 0 gcc
[ 82.487557] [ 5869] 1000 5869 11826 3577 1008
2569 0 118784 0 0 cc1
[ 82.492580] [ 5870] 1000 5870 1798 759 0
759 0 57344 0 0 sh
[ 82.497616] [ 5871] 1000 5871 1282 738 0
738 0 49152 0 0 gcc
[ 82.502671] [ 5872] 1000 5872 12506 4280 1584
2696 0 126976 0 0 cc1
[ 82.507703] [ 5878] 1000 5878 1798 753 0
753 0 53248 0 0 sh
[ 82.512705] [ 5879] 1000 5879 1282 607 0
607 0 53248 0 0 gcc
[ 82.517772] [ 5880] 1000 5880 11113 1506 144
1362 0 98304 0 0 cc1
[ 82.522782] oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0-1,oom_memcg=/build-kernel-tmp
fs,task_memcg=/build-kernel-tmpfs,task=cc1,pid=5646,uid=1000
[ 82.528351] Memory cgroup out of memory: Killed process 5646 (cc1)
total-vm:63292kB, anon-rss:21852kB, file-rss:12704k
B, shmem-rss:0kB, UID:1000 pgtables:148kB oom_score_adj:0
[ 82.534240] Tasks in /build-kernel-tmpfs are going to be killed due
to memory.oom.group set
[ 82.535005] Memory cgroup out of memory: Killed process 2025
(kbench) total-vm:7180kB, anon-rss:0kB, file-rss:1800kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.536248] Memory cgroup out of memory: Killed process 4734 (time)
total-vm:2544kB, anon-rss:0kB, file-rss:1196kB, sh
mem-rss:0kB, UID:1000 pgtables:48kB oom_score_adj:0
[ 82.534240] Tasks in /build-kernel-tmpfs are going to be killed due
to memory.oom.group set
[ 82.535005] Memory cgroup out of memory: Killed process 2025
(kbench) total-vm:7180kB, anon-rss:0kB, file-rss:1800kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.536248] Memory cgroup out of memory: Killed process 4734 (time)
total-vm:2544kB, anon-rss:0kB, file-rss:1196kB, sh
mem-rss:0kB, UID:1000 pgtables:48kB oom_score_adj:0
[ 82.537464] Memory cgroup out of memory: Killed process 4735 (make)
total-vm:12284kB, anon-rss:0kB, file-rss:3004kB, s
hmem-rss:0kB, UID:1000 pgtables:72kB oom_score_adj:0
[ 82.538684] Memory cgroup out of memory: Killed process 4736 (make)
total-vm:10824kB, anon-rss:1152kB, file-rss:2984kB
, shmem-rss:0kB, UID:1000 pgtables:72kB oom_score_adj:0
[ 82.544358] Memory cgroup out of memory: Killed process 5515 (make)
total-vm:10804kB, anon-rss:1152kB, file-rss:3056kB
, shmem-rss:0kB, UID:1000 pgtables:64kB oom_score_adj:0
[ 82.550088] Memory cgroup out of memory: Killed process 5519 (make)
total-vm:10236kB, anon-rss:576kB, file-rss:3012kB,
shmem-rss:0kB, UID:1000 pgtables:64kB oom_score_adj:0
[ 82.555514] Memory cgroup out of memory: Killed process 5520 (make)
total-vm:10188kB, anon-rss:576kB, file-rss:2960kB,
shmem-rss:0kB, UID:1000 pgtables:56kB oom_score_adj:0
[ 82.560873] Memory cgroup out of memory: Killed process 5522 (make)
total-vm:10188kB, anon-rss:576kB, file-rss:2960kB,
shmem-rss:0kB, UID:1000 pgtables:56kB oom_score_adj:0
[ 82.566342] Memory cgroup out of memory: Killed process 5524 (make)
total-vm:10188kB, anon-rss:576kB, file-rss:3024kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.571948] Memory cgroup out of memory: Killed process 5525 (make)
total-vm:10204kB, anon-rss:576kB, file-rss:2988kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.577447] Memory cgroup out of memory: Killed process 5526 (make)
total-vm:10276kB, anon-rss:576kB, file-rss:2976kB,
shmem-rss:0kB, UID:1000 pgtables:64kB oom_score_adj:0
[ 82.582835] Memory cgroup out of memory: Killed process 5527 (make)
total-vm:10280kB, anon-rss:576kB, file-rss:3040kB,
shmem-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.588226] Memory cgroup out of memory: Killed process 5528 (make)
total-vm:10160kB, anon-rss:576kB, file-rss:3016kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.593641] Memory cgroup out of memory: Killed process 5530 (make)
total-vm:10176kB, anon-rss:576kB, file-rss:2920kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.598976] Memory cgroup out of memory: Killed process 5532 (make)
total-vm:10324kB, anon-rss:576kB, file-rss:2984kB,
shmem-rss:0kB, UID:1000 pgtables:56kB oom_score_adj:0
[ 82.604485] Memory cgroup out of memory: Killed process 5536 (make)
total-vm:10184kB, anon-rss:576kB, file-rss:2984kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.609872] Memory cgroup out of memory: Killed process 5537 (make)
total-vm:10176kB, anon-rss:576kB, file-rss:2992kB,
shmem-rss:0kB, UID:1000 pgtables:68kB oom_score_adj:0
[ 82.615357] Memory cgroup out of memory: Killed process 5538 (sh)
total-vm:7192kB, anon-rss:0kB, file-rss:2976kB, shme
m-rss:0kB, UID:1000 pgtables:56kB oom_score_adj:0
[ 82.616558] Memory cgroup out of memory: Killed process 5540 (make)
total-vm:10324kB, anon-rss:576kB, file-rss:2988kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.621995] Memory cgroup out of memory: Killed process 5541 (sh)
total-vm:7188kB, anon-rss:0kB, file-rss:3004kB, shme
m-rss:0kB, UID:1000 pgtables:48kB oom_score_adj:0
[ 82.623641] Memory cgroup out of memory: Killed process 5543 (make)
total-vm:10176kB, anon-rss:576kB, file-rss:2968kB,
shmem-rss:0kB, UID:1000 pgtables:64kB oom_score_adj:0
[ 82.629202] Memory cgroup out of memory: Killed process 5545 (make)
total-vm:10180kB, anon-rss:576kB, file-rss:2984kB,
shmem-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.634612] Memory cgroup out of memory: Killed process 5548 (make)
total-vm:10188kB, anon-rss:576kB, file-rss:3036kB,
shmem-rss:0kB, UID:1000 pgtables:68kB oom_score_adj:0
[ 82.640089] Memory cgroup out of memory: Killed process 5550 (sh)
total-vm:7192kB, anon-rss:0kB, file-rss:2968kB, shme
m-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.645892] Memory cgroup out of memory: Killed process 5551 (make)
total-vm:10156kB, anon-rss:576kB, file-rss:2976kB,
shmem-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.651431] Memory cgroup out of memory: Killed process 5552 (make)
total-vm:10156kB, anon-rss:576kB, file-rss:2976kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.656848] Memory cgroup out of memory: Killed process 5553 (gcc)
total-vm:5128kB, anon-rss:0kB, file-rss:3068kB, shm
em-rss:0kB, UID:1000 pgtables:48kB oom_score_adj:0
[ 82.658138] Memory cgroup out of memory: Killed process 5556 (make)
total-vm:10164kB, anon-rss:576kB, file-rss:2996kB,
shmem-rss:0kB, UID:1000 pgtables:56kB oom_score_adj:0
[ 82.663629] Memory cgroup out of memory: Killed process 5557 (make)
total-vm:10156kB, anon-rss:576kB, file-rss:3008kB,
shmem-rss:0kB, UID:1000 pgtables:56kB oom_score_adj:0
[ 82.669002] Memory cgroup out of memory: Killed process 5561 (gcc)
total-vm:5128kB, anon-rss:0kB, file-rss:3012kB, shm
em-rss:0kB, UID:1000 pgtables:44kB oom_score_adj:0
[ 82.670288] Memory cgroup out of memory: Killed process 5562 (sh)
total-vm:7192kB, anon-rss:0kB, file-rss:3056kB, shme
m-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.671512] Memory cgroup out of memory: Killed process 5563 (make)
total-vm:10292kB, anon-rss:576kB, file-rss:3052kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
[ 82.677226] Memory cgroup out of memory: Killed process 5565 (sh)
total-vm:7192kB, anon-rss:0kB, file-rss:3000kB, shme
m-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.678551] Memory cgroup out of memory: Killed process 5566 (make)
total-vm:10176kB, anon-rss:576kB, file-rss:3032kB,
shmem-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.684045] Memory cgroup out of memory: Killed process 5569 (make)
total-vm:10168kB, anon-rss:576kB, file-rss:2976kB,
shmem-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.689561] Memory cgroup out of memory: Killed process 5572 (gcc)
total-vm:5128kB, anon-rss:0kB, file-rss:3020kB, shm
em-rss:0kB, UID:1000 pgtables:48kB oom_score_adj:0
[ 82.690824] Memory cgroup out of memory: Killed process 5573 (sh)
total-vm:7192kB, anon-rss:0kB, file-rss:3056kB, shme
m-rss:0kB, UID:1000 pgtables:52kB oom_score_adj:0
[ 82.692119] Memory cgroup out of memory: Killed process 5574 (make)
total-vm:10156kB, anon-rss:576kB, file-rss:3008kB,
shmem-rss:0kB, UID:1000 pgtables:60kB oom_score_adj:0
...
There are more processes that get killed by oom_group I omit here.

I haven't figured out why the patch + fix can cause swap stress test
oom kill regression. I will revert it in my bisect script to continue
haunting if there is another change breaking my swap stress test.

If there is any further fixup patch, please don't hesitate to send it
my way to test it.

Chris

>
> Chris
>
>
> On Tue, Sep 24, 2024 at 1:16 AM Venkat Rao Bagalkote
> <venkat88@linux.vnet.ibm.com> wrote:
> >
> > Please add below tages to the patch.
> >
> > Reported-by: Venkat Rao Bagalkote <venkat88@linux.vnet.ibm.com>
> >
> > Tested-by: Venkat Rao Bagalkote <venkat88@linux.vnet.ibm.com>
> >
> > Refer:
> > https://lore.kernel.org/lkml/57130e48-dbb6-4047-a8c7-ebf5aaea93f4@linux.vnet.ibm.com/
> >
> > Regards,
> >
> > Venkat.
> >
> > On 24/09/24 7:12 am, Sergey Senozhatsky wrote:
> > > On (24/09/23 19:48), Andrey Skvortsov wrote:
> > >> When CONFIG_ZRAM_MULTI_COMP isn't set ZRAM_SECONDARY_COMP can hold
> > >> default_compressor, because it's the same offset as ZRAM_PRIMARY_COMP,
> > >> so we need to make sure that we don't attempt to kfree() the
> > >> statically defined compressor name.
> > >>
> > >> This is detected by KASAN.
> > >>
> > >> ==================================================================
> > >> Call trace:
> > >> kfree+0x60/0x3a0
> > >> zram_destroy_comps+0x98/0x198 [zram]
> > >> zram_reset_device+0x22c/0x4a8 [zram]
> > >> reset_store+0x1bc/0x2d8 [zram]
> > >> dev_attr_store+0x44/0x80
> > >> sysfs_kf_write+0xfc/0x188
> > >> kernfs_fop_write_iter+0x28c/0x428
> > >> vfs_write+0x4dc/0x9b8
> > >> ksys_write+0x100/0x1f8
> > >> __arm64_sys_write+0x74/0xb8
> > >> invoke_syscall+0xd8/0x260
> > >> el0_svc_common.constprop.0+0xb4/0x240
> > >> do_el0_svc+0x48/0x68
> > >> el0_svc+0x40/0xc8
> > >> el0t_64_sync_handler+0x120/0x130
> > >> el0t_64_sync+0x190/0x198
> > >> ==================================================================
> > >>
> > >> Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
> > >> Fixes: 684826f8271a ("zram: free secondary algorithms names")
> > >> Cc: <stable@vger.kernel.org>
> > > Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> >