LTP new release 20190930 mm test cases mtest06 started failing always on beagle board x15 and intermittent failure on i386, mmap1.c:204: BROK: mmap((nil),2147483648,3,34,-1,0) failed: ENOMEM (12)

Do you notice this failure ?

Strace output: --------------------- [pid 383] mmap2(NULL, 2147483648, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...> [pid 382] waitpid(383, <unfinished ...> [pid 383] <... mmap2 resumed> ) = -1 ENOMEM (Cannot allocate memory) [pid 383] write(2, "mmap1.c:204: \BROK: \mm"..., 83mmap1.c:204: BROK: mmap((nil),2147483648,3,34,-1,0) failed: ENOMEM (12) ) = 83

Device under test: ------------------------- Architecture : ARMv7 (32 bits) Processor Family : AM5728 CPU model : DRA752-GP ES2.0 Cores : 2 x Cortex-A15

full test log: ----------------- https://lkft.validation.linaro.org/scheduler/job/980108#L1676 https://lkft.validation.linaro.org/scheduler/job/980109#L1228

LTP version: https://github.com/linux-test-project/ltp/releases/tag/20190930

Test case description: ------------------------------ /* * Test: Spawn 2 threads. First thread maps, writes and unmaps * an area. Second thread tries to read from it. Second thread * races against first thread. There is no synchronization * between threads, but each mmap/munmap increases a counter * that is checked to determine when has read occurred. If a read * hit SIGSEGV in between mmap/munmap it is a failure. If a read * between mmap/munmap worked, then its value must match expected * value. * * Can trigger panics/stalls since at least 4.14 on some arches: * fc8efd2ddfed ("mm/memory.c: do_fault: avoid usage of stale vm_area_struct") * Can trigger user-space stalls on aarch64: * 7a30df49f63a ("mm: mmu_gather: remove __tlb_reset_range() for force flush") * https://lore.kernel.org/linux-mm/1817839533.20996552.1557065445233.JavaMail.... * Can trigger "still mapped when deleted" BUG at mm/filemap.c:171, on aarch64 since 4.20 * e1b98fa31664 ("locking/rwsem: Add missing ACQUIRE to read_slowpath exit when queue is empty") * 99143f82a255 ("lcoking/rwsem: Add missing ACQUIRE to read_slowpath sleep loop") */

Best regards Naresh Kamboju