FYI, we noticed the following commit (built with gcc-7): commit: 1fc14cf67325190e0075cf3cd5511965499fffb4 ("[RFC v2] memcg: add memcg lru for page reclaiming") url: https://github.com/0day-ci/linux/commits/Hillf-Danton/memcg-add-memcg-lru-for-page-reclaiming/20191029-143906 in testcase: vm-scalability with following parameters: runtime: 300s test: lru-file-mmap-read cpufreq_governor: performance ucode: 0x500002b test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us. test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/ on test machine: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz with 192G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +--------------------------------------------------+------------+------------+ | | 8005803a2c | 1fc14cf673 | +--------------------------------------------------+------------+------------+ | boot_successes | 2 | 4 | | boot_failures | 11 | | | WARNING:at_fs/iomap/direct-io.c:#iomap_dio_actor | 10 | | | RIP:iomap_dio_actor | 10 | | | BUG:kernel_hang_in_boot_stage | 1 | | | last_state.OOM | 0 | 4 | +--------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot user :notice: [ 51.667771] 2019-11-06 23:56:11 ./usemem --runtime 300 -f /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-71 --readonly 22906492245 user :notice: [ 51.697549] 2019-11-06 23:56:11 ./usemem --runtime 300 -f /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-72 --readonly 22906492245 kern :warn : [ 51.715513] usemem invoked oom-killer: gfp_mask=0x400dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), order=0, oom_score_adj=0 user :notice: [ 51.724161] 2019-11-06 23:56:11 truncate /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-73 -s 22906492245 kern :warn : [ 51.727992] CPU: 11 PID: 3618 Comm: usemem Not tainted 5.4.0-rc5-00020-g1fc14cf673251 #2 user :notice: [ 51.744101] 2019-11-06 23:56:11 ./usemem --runtime 300 -f /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-73 --readonly 22906492245 kern :warn : [ 51.752655] Call Trace: kern :warn : [ 51.752666] dump_stack+0x5c/0x7b user :notice: [ 51.771480] 2019-11-06 23:56:11 truncate /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-74 -s 22906492245 kern :warn : [ 51.775027] dump_header+0x4a/0x220 kern :warn : [ 51.775029] oom_kill_process+0xe9/0x130 kern :warn : [ 51.775031] out_of_memory+0x105/0x510 kern :warn : [ 51.775037] __alloc_pages_slowpath+0xa3f/0xdb0 kern :warn : [ 51.775040] __alloc_pages_nodemask+0x2f0/0x340 kern :warn : [ 51.775044] pte_alloc_one+0x13/0x40 kern :warn : [ 51.775048] __handle_mm_fault+0xe9d/0xf70 kern :warn : [ 51.775050] handle_mm_fault+0xdd/0x210 kern :warn : [ 51.775054] __do_page_fault+0x2f1/0x520 kern :warn : [ 51.775056] do_page_fault+0x30/0x120 user :notice: [ 51.782517] 2019-11-06 23:56:11 truncate /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-75 -s 22906492245 kern :warn : [ 51.792048] page_fault+0x3e/0x50 kern :warn : [ 51.792051] RIP: 0033:0x55c6ced07cfc user :notice: [ 51.798308] 2019-11-06 23:56:11 ./usemem --runtime 300 -f /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-74 --readonly 22906492245 kern :warn : [ 51.799413] Code: 00 00 e8 37 f6 ff ff 48 83 c4 08 c3 48 8d 3d 74 23 00 00 e8 56 f6 ff ff bf 01 00 00 00 e8 bc f6 ff ff 85 d2 74 08 48 8d 04 f7 <48> 8b 00 c3 48 8d 04 f7 48 89 30 b8 00 00 00 00 c3 48 89 f8 48 29 kern :warn : [ 51.799415] RSP: 002b:00007ffe889ebfe8 EFLAGS: 00010202 user :notice: [ 51.808045] 2019-11-06 23:56:11 ./usemem --runtime 300 -f /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-75 --readonly 22906492245 kern :warn : [ 51.809437] RAX: 00007fd4c5400000 RBX: 00000000085cc600 RCX: 0000000000000018 kern :warn : [ 51.809438] RDX: 0000000000000001 RSI: 00000000085cc600 RDI: 00007fd48259d000 kern :warn : [ 51.809440] RBP: 00000000085cc600 R08: 000000005dc2ed1f R09: 00007ffe889ebfa0 user :notice: [ 51.818030] 2019-11-06 23:56:11 truncate /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-76 -s 22906492245 kern :warn : [ 51.820780] R10: 00007ffe889ebfa0 R11: 0000000000000246 R12: 0000000042e63000 kern :warn : [ 51.820781] R13: 00007fd48259d000 R14: 00007ffe889ec08c R15: 0000000000000001 kern :warn : [ 51.820813] Mem-Info: user :notice: [ 51.829016] 2019-11-06 23:56:11 ./usemem --runtime 300 -f /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-76 --readonly 22906492245 kern :warn : [ 51.830751] active_anon:68712 inactive_anon:29360 isolated_anon:0 active_file:497 inactive_file:48481807 isolated_file:32 unevictable:259869 dirty:2 writeback:0 unstable:0 slab_reclaimable:130937 slab_unreclaimable:70163 mapped:48488420 shmem:30398 pagetables:97884 bounce:0 free:169055 free_pcp:20966 free_cma:0 user :notice: [ 51.838463] 2019-11-06 23:56:11 truncate /tmp/vm-scalability-tmp/vm-scalability/sparse-lru-file-mmap-read-77 -s 22906492245 kern :warn : [ 51.840634] Node 0 active_anon:109476kB inactive_anon:1400kB active_file:76kB inactive_file:47988152kB unevictable:281836kB isolated(anon):0kB isolated(file):0kB mapped:47993516kB dirty:4kB writeback:0kB shmem:1512kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Rong Chen