Hi, [moved to debian-mips@l.d.o] On 24/07/17 22:48, Steven Capper wrote: > Hi, > I've been tweaking my tbb package for Buster, and have upgraded to > latest upstream release and am closing off a few bugs. > > One thing I noticed is a strange failure mode for 2017~U7-2 > (targetting sid) on the mips and mipsel buildds. Logs at: > https://buildd.debian.org/status/fetch.php?pkg=tbb&arch=mips&ver=2017~U7-2&stamp=1500818436&raw=0 > and, > https://buildd.debian.org/status/fetch.php?pkg=tbb&arch=mipsel&ver=2017~U7-2&stamp=1500865997&raw=0 > > (mips64el appears to work fine) > > The failure mode is: > > ./test_malloc_pools.exe 1:4 > Call stack info (6): > ./test_malloc_pools.exe(_Z16print_call_stackv+0x8c)[0x5565ea78] > ./test_malloc_pools.exe(_Z11ReportErrorPKciS0_S0_+0x40)[0x5565ec1c] > ./test_malloc_pools.exe(_Z19TestFixedBufferPoolv+0x828)[0x55660b60] > ./test_malloc_pools.exe(_Z8TestMainv+0x64)[0x55662af8] > ./test_malloc_pools.exe(main+0x98)[0x5565e2d8] > /lib/mipsel-linux-gnu/libc.so.6(__libc_start_main+0x108)[0x778ed4c8] > ../../src/test/harness.h:530, assertion 0==status: NativeParallelFor: > pthread_create failed Running it in strace gives: > clone(child_stack=0x7f045ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f0464f8, tls=0x7f04d920, child_tidptr=0x7f0464f8) = 16753 > mmap2(NULL, 4194304, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f047000 > mprotect(0x7f047000, 4096, PROT_NONE) = 0 > clone(child_stack=0x7f445ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4464f8, tls=0x7f44d920, child_tidptr=0x7f4464f8) = 16754 > mmap2(NULL, 4194304, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f447000 > mprotect(0x7f447000, 4096, PROT_NONE) = 0 > clone(child_stack=0x7f845ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f8464f8, tls=0x7f84d920, child_tidptr=0x7f8464f8) = 16755 > mmap2(NULL, 4194304, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = -1 ENOMEM (Cannot allocate memory) Which means it probably run out of virtual memory to allocate any more stacks. Since 32-bit mips is limited to 2GB of virtual memory and the default stack size is 4MB, this places an upper limit on the number of threads per process at 512. In practice it will be smaller than that since we have to store the heap, executables etc. James
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