# description nvml test suite vmmalloc_fork test hang. $ ps -eo stat,comm | grep vmma S+ vmmalloc_fork Sl+ vmmalloc_fork Z+ vmmalloc_fork <defunct> Sl+ vmmalloc_fork Z+ vmmalloc_fork <defunct> Z+ vmmalloc_fork <defunct> Sl+ vmmalloc_fork Z+ vmmalloc_fork <defunct> Z+ vmmalloc_fork <defunct> Z+ vmmalloc_fork <defunct> dmesg: [ 250.499097] INFO: task vmmalloc_fork:9805 blocked for more than 120 seconds. [ 250.530667] Not tainted 4.9.09fe68ca+ #27 [ 250.550901] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 250.585752] vmmalloc_fork D[ 250.598362] ffffffff8171813c 0 9805 9765 0x00000080 [ 250.623445] ffff88075dc68f80[ 250.636052] 0000000000000000 ffff88076058db00 ffff88017c5b0000 ffff880763b19340[ 250.668510] ffffc9000fe1bbb0 ffffffff8171813c ffffc9000fe1bc20 ffffc9000fe1bbe0[ 250.704220] ffffffff82248898 ffff88076058db00 ffffffff82248898Call Trace: [ 250.738382] [<ffffffff8171813c>] ? __schedule+0x21c/0x6a0 [ 250.763404] [<ffffffff817185f6>] schedule+0x36/0x80 [ 250.786177] [<ffffffff81284471>] get_unlocked_mapping_entry+0xc1/0x120 [ 250.815869] [<ffffffff81283810>] ? iomap_dax_rw+0x110/0x110 [ 250.841350] [<ffffffff81284c0a>] grab_mapping_entry+0x4a/0x220 [ 250.868442] [<ffffffff812851e9>] iomap_dax_fault+0xa9/0x3b0 [ 250.894437] [<ffffffffa02b15fe>] xfs_filemap_fault+0xce/0xf0 [xfs] [ 250.922805] [<ffffffff811d3159>] __do_fault+0x79/0x100 [ 250.947035] [<ffffffff811d7a2b>] do_fault+0x49b/0x690 [ 250.970964] [<ffffffffa02b146c>] ? xfs_filemap_pmd_fault+0x9c/0x160 [xfs] [ 251.001812] [<ffffffff811d94ba>] handle_mm_fault+0x61a/0xa50 [ 251.027736] [<ffffffff8106c3da>] __do_page_fault+0x22a/0x4a0 [ 251.053700] [<ffffffff8106c680>] do_page_fault+0x30/0x80 [ 251.077962] [<ffffffff81003b55>] ? do_syscall_64+0x175/0x180 [ 251.103835] [<ffffffff8171e208>] page_fault+0x28/0x30 # kernel versions: v4.6 pass in seconds v4.7 hang v4.9-rc1 hang Linus tree to commit 9fe68ca hang bisect points to first bad commit: [ac401cc782429cc8560ce4840b1405d603740917] dax: New fault locking v4.7 with these 3 commits reverted pass: 4d9a2c8 - Jan Kara, 6 months ago : dax: Remove i_mmap_lock protection bc2466e - Jan Kara, 6 months ago : dax: Use radix tree entry lock to protect cow faults ac401cc - Jan Kara, 6 months ago : dax: New fault locking # nvml version: https://github.com/pmem/nvml.git to commit: feab4d6f65102139ce460890c898fcad09ce20ae # How reproducible: always # Test steps: <git clone and pmem0 setup> $cd nvml $make install -j64 $cat > src/test/testconfig.sh <<EOF PMEM_FS_DIR=/daxmnt NON_PMEM_FS_DIR=/tmp EOF $mkfs.xfs /dev/pmem0 $mkdir -p /daxmnt/ $mount -o dax /dev/pmem0 /daxmnt/ $make -C src/test/vmmalloc_fork/ TEST_TIME=60m clean $make -C src/test/vmmalloc_fork/ TEST_TIME=60m check $umount /daxmnt -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
