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Reproduce scenes: * On fedora34 * autofs.service is started * test is nis user, which mounted at /nis by autofs * under /nis/test, there are symlinks point to another nis mount point /nis/yan Result: task boost-build-native:do_install hang forever NOTE: recipe ovmf-edk2-stable202102-r0: task do_package_write_rpm: Succeeded NOTE: Running noexec task 8124 of 8152 (/layers/oe-core/meta/recipes-core/ovmf/ovmf_git.bb:do_build) Bitbake still alive (5000s) Bitbake still alive (10000s) Bitbake still alive (15000s) Bitbake still alive (20000s) Bitbake still alive (25000s) Bitbake still alive (30000s) Bitbake still alive (35000s) Bitbake still alive (40000s) Bitbake still alive (45000s) Bitbake still alive (50000s) $ps aux | grep b2 test 2773444 0.0 0.0 13532 2748 ? D Jul01 0:00 ./b2 install --prefix=/build/tmp-glibc/work/x86_64-linux/boost-build-native/4.4.1-r0/recipe-sysroot-native/usr staging-prefix=/build/tmp-glibc/work/x86_64-linux/boost-build-native/4.4.1-r0/image/build/tmp-glibc/work/x86_64-linux/boost-build-native/4.4.1-r0/recipe-sysroot-native/usr $ sudo cat /proc/2773444/stack [<0>] autofs_wait+0x257/0x720 [<0>] autofs_mount_wait+0x49/0xf0 [<0>] autofs_d_manage+0x76/0x1a0 [<0>] __traverse_mounts+0xd9/0x220 [<0>] step_into+0x3ad/0x6d0 [<0>] walk_component+0x62/0x190 [<0>] link_path_walk.part.0.constprop.0+0x20d/0x350 [<0>] path_lookupat+0x3a/0x1b0 [<0>] filename_lookup+0x9b/0x180 [<0>] vfs_statx+0x64/0x100 [<0>] __do_sys_newfstatat+0x1e/0x40 [<0>] do_syscall_64+0x33/0x40 [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 $ dmesg [1559743.424610] autofs4:pid:2773444:autofs_mount_wait: waiting for mount name=yan [1559743.424621] autofs4:pid:2773444:autofs_wait: existing wait id = 0x00000056, name = yan, nfy=1 [1560001.400440] autofs4:pid:2774530:autofs_mount_wait: waiting for mount name=yan [1560001.400452] autofs4:pid:2774530:autofs_wait: existing wait id = 0x00000056, name = yan, nfy=1 [1560022.493282] autofs4:pid:2774537:autofs_mount_wait: waiting for mount name=yan [1560022.493292] autofs4:pid:2774537:autofs_wait: existing wait id = 0x00000056, name = yan, nfy=1 [1560122.076589] autofs4:pid:3979116:autofs_mount_wait: mount wait done status=-4 [1560162.222374] autofs4:pid:2774530:autofs_mount_wait: mount wait done status=-4 [1560167.116188] autofs4:pid:2774537:autofs_mount_wait: mount wait done status=-4 [1560188.140532] autofs4:pid:2774671:autofs_mount_wait: waiting for mount name=yan [1560188.140540] autofs4:pid:2774671:autofs_wait: existing wait id = 0x00000056, name = yan, nfy=1 [1560189.651905] autofs4:pid:2774671:autofs_mount_wait: mount wait done status=-4 Analyzation: b2 will walk the HOME dir, when access the symlink point to /nis/yan, autofs hang at autofs_wait. the process stay at D stat forever. This maybe caused by abnormal status of autofs.service. The problem cannot reproduce after restart autofs.service. There should be an autofs bug. and there is an autofs hang problem bug on fedora34 on it's bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1953390 Workaround: Since b2 don't actually write something to HOME dir, change HOME dir to /var/run, a dir not mounted by autofs. (From OE-Core rev: 760b7b6a031c9dcc9a44e086e1d2dbb2171b3c97) Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> (cherry picked from commit 7ff692d2e9787bb5b36929a208597595473db0c7) Signed-off-by: Anuj Mittal <anuj.mittal@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.