On Sat, 6 May 2023, Michael Schmitz wrote:
I'm trying to find out whether patch 2 mitigates the effect of patch
1.
It didn't - hung without printing an Oops message, on the first stress
iteration using the --stack 2 --stack-fill stressor.
When I run that under stock v6.3, one of the stress-ng-stack processes
gets killed by the OOM killer, followed by a soft lockup.
So I'd say the failure you saw was not related to the patches you used.
# stress-ng -t 180 --stack 2 --stack-fill
stress-ng: info: [43] setting to a 180 second (3 mins, 0.00 secs) run per stressor
stress-ng: info: [43] dispatching hogs: 2 stack
[ 162.400000] stress-ng-stack invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=1000
[ 162.420000] CPU: 0 PID: 47 Comm: stress-ng-stack Not tainted 6.3.0-mac #3
[ 162.420000] Stack from 01465d68:
[ 162.420000] 01465d68 004d72d8 004d72d8 fffffffd 7fffffff 01465d88 0040e286 004d72d8
[ 162.420000] 01465db8 0040b74c fffffffd 7fffffff ffffffff 00000840 00000000 00000000
[ 162.420000] 0092f520 01465e80 004e5560 0092f520 01465df0 0008a110 01465e80 0092f520
[ 162.420000] fffffffd 7fffffff ffffffff 00000840 00000000 00000000 01465e80 004e56aa
[ 162.420000] 004e5560 01465e80 01465e1c 0008a6e0 01465e80 004ad402 00140cca 00000002
[ 162.420000] 00000000 000c21b2 0050b376 00000000 00000000 01465ea4 000c373a 01465e80
[ 162.420000] Call Trace: [<0040e286>] dump_stack+0x10/0x16
[ 162.420000] [<0040b74c>] dump_header+0x52/0x1be
[ 162.420000] [<0008a110>] oom_kill_process+0x3bc/0x3f8
[ 162.420000] [<0008a6e0>] out_of_memory+0x2e4/0x44c
[ 162.420000] [<00140cca>] proc_pid_status+0x16e/0x1370
[ 162.420000] [<000c21b2>] get_page_from_freelist+0x0/0xb76
[ 162.420000] [<000c373a>] __alloc_pages+0x734/0xb30
[ 162.420000] [<000b28fe>] find_vma+0x0/0x22
[ 162.420000] [<00410cf2>] down_read+0x0/0xd6
[ 162.420000] [<001408ca>] do_task_stat+0x1038/0x1224
[ 162.420000] [<00010000>] sm_dnrm+0x6/0x1a
[ 162.420000] [<00020000>] __release_region+0x54/0xc8
[ 162.420000] [<00140cca>] proc_pid_status+0x16e/0x1370
[ 162.420000] [<00001e70>] kernel_pg_dir+0xe70/0x1000
[ 162.420000] [<00002865>] calibrate_delay+0xd3/0x26a
[ 162.420000] [<000c3f38>] __folio_alloc+0x20/0x26
[ 162.420000] [<00140cca>] proc_pid_status+0x16e/0x1370
[ 162.420000] [<000aceea>] handle_mm_fault+0x904/0xb28
[ 162.420000] [<00100cca>] zero_user_segments+0x10e/0x12c
[ 162.420000] [<000ef3c7>] take_dentry_name_snapshot+0x47/0x64
[ 162.420000] [<000070ac>] do_page_fault+0xde/0x292
[ 162.420000] [<00006204>] buserr_c+0x2d6/0x6c4
[ 162.420000] [<00002000>] _start+0x0/0x8
[ 162.420000] [<00040000>] pick_next_task_dl+0x7c/0x8c
[ 162.420000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 162.420000] [<00002aa4>] buserr+0x20/0x28
[ 162.420000] [<00002000>] _start+0x0/0x8
[ 162.420000] [<00040000>] pick_next_task_dl+0x7c/0x8c
[ 162.420000] [<0004c017>] irq_thread_dtor+0x7/0xd8
[ 162.420000] [<0020b289>] ioc_find_get_icq+0x107/0x246
[ 162.420000]
[ 162.430000] Mem-Info:
[ 162.440000] active_anon:5264 inactive_anon:1765 isolated_anon:0
[ 162.440000] active_file:0 inactive_file:0 isolated_file:0
[ 162.440000] unevictable:3 dirty:0 writeback:0
[ 162.440000] slab_reclaimable:71 slab_unreclaimable:331
[ 162.440000] mapped:564 shmem:560 pagetables:16
[ 162.440000] sec_pagetables:0 bounce:0
[ 162.440000] kernel_misc_reclaimable:0
[ 162.440000] free:176 free_pcp:0 free_cma:0
[ 162.450000] Node 0 active_anon:21056kB inactive_anon:7060kB active_file:0kB inactive_file:0kB unevictable:12kB isolated(anon):0kB isolated(file):0kB mapped:2256kB dirty:0kB writeback:0kB shmem:2240kB writeback_tmp:0kB kernel_stack:280kB pagetables:64kB sec_pagetables:0kB all_unreclaimable? no
[ 162.460000] DMA free:704kB boost:0kB min:704kB low:880kB high:1056kB reserved_highatomic:0KB active_anon:21056kB inactive_anon:7060kB active_file:0kB inactive_file:0kB unevictable:12kB writepending:0kB present:36864kB managed:31168kB mlocked:12kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 162.480000] lowmem_reserve[]: 0 0 0
[ 162.490000] DMA: 0*4kB 0*8kB 0*16kB 0*32kB 1*64kB (M) 1*128kB (M) 2*256kB (M) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 704kB
[ 162.520000] 611 total pagecache pages
[ 162.530000] 0 pages in swap cache
[ 162.540000] Free swap = 0kB
[ 162.550000] Total swap = 0kB
[ 162.560000] 9216 pages RAM
[ 162.570000] 0 pages HighMem/MovableOnly
[ 162.580000] 1424 pages reserved
[ 162.590000] Tasks state (memory values in pages):
[ 162.610000] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name
[ 162.620000] [ 43] 0 43 5254 754 12032 0 -1000 stress-ng
[ 162.630000] [ 44] 0 44 5254 197 8448 0 -1000 stress-ng-stack
[ 162.640000] [ 45] 0 45 5254 197 8448 0 -1000 stress-ng-stack
[ 162.650000] [ 46] 0 46 8439 3336 21248 0 1000 stress-ng-stack
[ 162.660000] [ 47] 0 47 8375 3274 20992 0 1000 stress-ng-stack
[ 162.670000] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),task=stress-ng-stack,pid=46,uid=0
[ 162.690000] Out of memory: Killed process 46 (stress-ng-stack) total-vm:33756kB, anon-rss:13336kB, file-rss:4kB, shmem-rss:4kB, UID:0 pgtables:20kB oom_score_adj:1000
[ 220.440000] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kswapd0:20]
[ 220.440000] Modules linked in:
[ 220.440000] Format 00 Vector: 0064 PC: 0009310c Status: 2004 Not tainted
[ 220.440000] ORIG_D0: ffffffff D0: 00000000 A2: 0085a530 A1: 0000029b
[ 220.440000] A0: 0050b3f2 D5: 00000000 D4: 00000001
[ 220.440000] D3: 00000002 D2: 0000001f D1: 0000029c
[ 244.440000] watchdog: BUG: soft lockup - CPU#0 stuck for 45s! [kswapd0:20]
[ 244.440000] Modules linked in:
[ 244.440000] Format 00 Vector: 0064 PC: 00207178 Status: 2000 Tainted: G L
[ 244.440000] ORIG_D0: ffffffff D0: 0000000c A2: 0085a530 A1: 008e3f02
[ 244.440000] A0: 008e3e48 D5: 00000000 D4: 00000001
[ 244.440000] D3: 00000002 D2: 00000000 D1: 00000000
[ 268.440000] watchdog: BUG: soft lockup - CPU#0 stuck for 68s! [kswapd0:20]
[ 268.440000] Modules linked in:
[ 268.440000] Format 00 Vector: 0064 PC: 00095a76 Status: 2000 Tainted: G L
[ 268.440000] ORIG_D0: ffffffff D0: 00000000 A2: 0085a530 A1: 0085a530
[ 268.440000] A0: fffffff6 D5: 00000000 D4: 00000001
[ 268.440000] D3: 00000002 D2: 0000001f D1: 00000020
[ 292.440000] watchdog: BUG: soft lockup - CPU#0 stuck for 90s! [kswapd0:20]
[ 292.440000] Modules linked in:
[ 292.440000] Format 00 Vector: 0064 PC: 000930d0 Status: 2000 Tainted: G L
[ 292.440000] ORIG_D0: ffffffff D0: 00000299 A2: 0085a530 A1: 0000029b
[ 292.440000] A0: 0050b3f2 D5: 00000000 D4: 00000001
[ 292.440000] D3: 00000002 D2: 0000001f D1: 0000001f
[ 316.450000] watchdog: BUG: soft lockup - CPU#0 stuck for 112s! [kswapd0:20]
[ 316.450000] Modules linked in:
[ 316.450000] Format 00 Vector: 0064 PC: 0009142a Status: 2004 Tainted: G L
[ 316.450000] ORIG_D0: ffffffff D0: 0000000c A2: 0085a530 A1: 008e3f02
[ 316.450000] A0: 0050b376 D5: 00000000 D4: 00000001
[ 316.450000] D3: 00000002 D2: 00000000 D1: 00000000
[ 340.450000] watchdog: BUG: soft lockup - CPU#0 stuck for 135s! [kswapd0:20]
[ 340.450000] Modules linked in:
[ 340.450000] Format 00 Vector: 0064 PC: 00092cd2 Status: 2000 Tainted: G L
[ 340.450000] ORIG_D0: ffffffff D0: 0000000f A2: 0085a530 A1: 000000b0
[ 340.450000] A0: 00092c9e D5: 008e3f94 D4: 00000002
[ 340.450000] D3: 00044260 D2: 00000000 D1: 0050b3ae
[ 364.450000] watchdog: BUG: soft lockup - CPU#0 stuck for 157s! [kswapd0:20]
[ 364.450000] Modules linked in:
[ 364.450000] Format 00 Vector: 0064 PC: 000b06de Status: 2004 Tainted: G L
[ 364.450000] ORIG_D0: ffffffff D0: 0000000c A2: 0085a530 A1: 008e3f02
[ 364.450000] A0: 0050b376 D5: 00000000 D4: 00000001
[ 364.450000] D3: 00000002 D2: 00000000 D1: 00000000
[ 388.450000] watchdog: BUG: soft lockup - CPU#0 stuck for 179s! [kswapd0:20]
[ 388.450000] Modules linked in:
[ 388.450000] Format 00 Vector: 0064 PC: 000359da Status: 2000 Tainted: G L
[ 388.450000] ORIG_D0: ffffffff D0: 00000003 A2: 0085a530 A1: 008e3f94
[ 388.450000] A0: 008e3f88 D5: 008e3f94 D4: 00000001
[ 388.450000] D3: 00000000 D2: 00000000 D1: 00000003
[ 412.450000] watchdog: BUG: soft lockup - CPU#0 stuck for 202s! [kswapd0:20]
[ 412.450000] Modules linked in:
[ 412.450000] Format 00 Vector: 0064 PC: 00095ca6 Status: 2000 Tainted: G L
[ 412.450000] ORIG_D0: ffffffff D0: 0050b644 A2: 0085a530 A1: 008e3f44
[ 412.450000] A0: 0085a530 D5: 00000000 D4: 00000001
[ 412.450000] D3: 00000001 D2: 0000001f D1: 00000000
[ 436.450000] watchdog: BUG: soft lockup - CPU#0 stuck for 224s! [kswapd0:20]
[ 436.450000] Modules linked in:
[ 436.450000] Format 00 Vector: 0064 PC: 000359e2 Status: 2004 Tainted: G L
[ 436.450000] ORIG_D0: ffffffff D0: 00000000 A2: 0085a530 A1: 008e3f44
[ 436.450000] A0: 008afe00 D5: 00000000 D4: 00000001
[ 436.450000] D3: 00000001 D2: 00000000 D1: 00000000
[ 460.460000] watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kswapd0:20]
[ 460.460000] Modules linked in:
[ 460.460000] Format 00 Vector: 0064 PC: 00092b30 Status: 2004 Tainted: G L
[ 460.460000] ORIG_D0: ffffffff D0: 008e3f44 A2: 0085a530 A1: 008e3f44
[ 460.460000] A0: 0050b15c D5: 00000000 D4: 00000001
[ 460.460000] D3: 00000001 D2: 00000000 D1: 00000000
[ 484.460000] watchdog: BUG: soft lockup - CPU#0 stuck for 269s! [kswapd0:20]
[ 484.460000] Modules linked in:
[ 484.460000] Format 00 Vector: 0064 PC: 000930c0 Status: 2000 Tainted: G L
[ 484.460000] ORIG_D0: ffffffff D0: 00000000 A2: 0085a530 A1: 008e3f02
[ 484.460000] A0: 0050b3f2 D5: 00000000 D4: 00000001
[ 484.460000] D3: 00000001 D2: 0000001f D1: 0000001f
[ 508.460000] watchdog: BUG: soft lockup - CPU#0 stuck for 291s! [kswapd0:20]
[ 508.460000] Modules linked in:
[ 508.460000] Format 00 Vector: 0064 PC: 00097f8c Status: 2014 Tainted: G L
[ 508.460000] ORIG_D0: ffffffff D0: 00002014 A2: 0085a530 A1: 008e3f4c
[ 508.460000] A0: 008e3f02 D5: 008e3f94 D4: 00000001
[ 508.460000] D3: 00000001 D2: 00000000 D1: 00000048
[ 532.460000] watchdog: BUG: soft lockup - CPU#0 stuck for 313s! [kswapd0:20]
[ 532.460000] Modules linked in:
[ 532.460000] Format 00 Vector: 0064 PC: 00095a5c Status: 2008 Tainted: G L
[ 532.460000] ORIG_D0: ffffffff D0: fffffff6 A2: 0085a530 A1: 0085a530
[ 532.460000] A0: fffffff6 D5: 00000000 D4: 00000001
[ 532.460000] D3: 00000001 D2: 0000001f D1: 00000020
