On Sun, Jan 10, 2021 at 04:32:13PM +0300, Vasily Postnicov wrote: > This is as minimal as I can get. If I knew where to find, what to fix, I > would never waste my time seeking for help on mailing lists. > > Just put FreeBSD in that damn bhyve and play with it, get your hands dirty, > you are the developer after all, not me! Your knowledge of FreeBSD is > supposedly much greater that mine. > > For me acceptable solutions are: > 1) Remove unsandboxed call to getaddrinfo() from ping. > 2) Do not compile with that casper crap which gives false sense of security > or whatsoever. > > I just wanted to help you find a bug where fork() hangs for no reason. So I > provided you with all I can get from this situation. Just 20 lines of code > to reproduce the bug. And you tell me this is not what you want. So what do > you want? A patch that fixes your problem? > > Sorry for harsh words in your address. But in such situations I question > myself should I really report anything and ask anything in FreeBSD > community. > > Btw, if you are still interested, I think I can provide you with the whole > bhyve image in which you can reproduce the bug. It contains modified > /etc/nsswitch.conf if you cannot change it yourself.
Just to follow up, we got a simpler repro based on the one you provided. A few bugs were found and fixed as a result: https://cgit.freebsd.org/src/commit/?id=21f749da82e755aafab127618affeffb86cff9a5 https://cgit.freebsd.org/src/commit/?id=513320c0f1122f096468c0b01623ba7c7e77cbe2 https://cgit.freebsd.org/src/commit/?id=85d028223bc2768651f4d44881644ceb5dc2a664 https://cgit.freebsd.org/src/commit/?id=57f22c828ec01e0d92bc8858f61df06b4d81ea5c > сб, 9 янв. 2021 г., 21:47 Konstantin Belousov <kostik...@gmail.com>: > > > On Sat, Jan 09, 2021 at 08:25:46PM +0300, Vasily Postnicov wrote: > > > Brilliant! It took me almost a day to dive into ZeroMQ to reassure > > > myself that there is nothing wrong with it. When I tried to write > > > minimal test programs which call fork after pthread_create() in all > > > combinations. When I realized that NSS stub module is what I need. > > > > > > Instructions: > > > > > > 1) Compile NSS stub module: cc -shared -fPIC -pthread -o > > > nss_zerodns.so.1 test.c (Note '.1' at the end). > > > 2) Copy nss_zerodns.so.1 to /usr/local/lib > > > 3) Apply the patch src_sbin_ping_main.c to ping source code. With this > > > patch ping will not quit too early when the initial call to > > > getaddrinfo() fails. > > > 4) Add stub module to /etc/nsswitch.conf: edit 'hosts' line to be > > > 'hosts: files dns zerodns' > > > 5) Ping non-existent host, like 'ping foo.bar' > > > 6) Ping will hang. The child process which it creates cannot be killed > > > even with killall -9 ping > > > > This is exactly what I do not want. Provide a standalone binary (or > > binaries) that can be just run and demonstrate the issue. Without > > editing nsswitch.conf or patching ping. > > _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
