Date: Thu, 27 Aug 2015 20:53:09 +0200 From: Michiel Boland <boland37@xs4all.nl> To: Konstantin Belousov <kostikbel@gmail.com>, Mark Martinec <Mark.Martinec+freebsd@ijs.si> Cc: freebsd-stable@freebsd.org Subject: Re: Latest stable (r287104) bash leaves zombies on exit Message-ID: <55DF5C95.90502@xs4all.nl> In-Reply-To: <20150827162602.GJ2072@kib.kiev.ua> References: <E1ZUucG-000C5n-0C@dilbert.ingresso.co.uk> <63a84f64baf8768a551fc6464e8e9526@mailbox.ijs.si> <20150827162602.GJ2072@kib.kiev.ua>
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The xterm program has a SIGCHLD signal handler that calls wait().
If the handler is invoked while xterm is exiting, a deadlock occurs in rtld.
Cheers
Michiel
#0 _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
#1 0x000000080305a2b0 in __thr_rwlock_rdlock (rwlock=0x803272980,
flags=<value optimized out>, tsp=<value optimized out>)
at /usr/src/lib/libthr/thread/thr_umtx.c:277
#2 0x000000080306179c in _thr_rtld_rlock_acquire (lock=0x803272980)
at thr_umtx.h:196
#3 0x00000008006a72c2 in rlock_acquire (lock=0x8008ba860,
lockstate=0x7fffffffd5b8) at /usr/src/libexec/rtld-elf/rtld_lock.c:201
#4 0x00000008006a0c8d in _rtld_bind (obj=0x8006bc000, reloff=6840)
at /usr/src/libexec/rtld-elf/rtld.c:701
#5 0x000000080069e46d in _rtld_bind_start ()
at /usr/src/libexec/rtld-elf/amd64/rtld_start.S:121
#6 0x0000000000445d34 in reapchild (n=20) at main.c:5177
#7 <signal handler called>
#8 objlist_call_fini () at /usr/src/libexec/rtld-elf/rtld.c:769
#9 0x00000008006a0c2b in rtld_exit () at /usr/src/libexec/rtld-elf/rtld.c:2710
#10 0x00000008024e5406 in __cxa_finalize (dso=0x0)
at /usr/src/lib/libc/stdlib/atexit.c:200
#11 0x000000080248692c in exit (status=0) at /usr/src/lib/libc/stdlib/exit.c:67
#12 0x0000000000445f35 in Exit (n=0) at main.c:5078
#13 0x0000000000456020 in Cleanup (code=0) at misc.c:5238
#14 0x000000000044da49 in NormalExit () at misc.c:5222
#15 0x000000000045a616 in readPtyData (xw=0x804cdc000, select_mask=0x6add80,
data=0x804d64000) at ptydata.c:221
#16 0x0000000000421c48 in in_put (xw=0x804cdc000) at charproc.c:4700
#17 0x0000000000421b6a in doinput () at charproc.c:4856
#18 0x000000000041d992 in VTparse (xw=0x804cdc000) at charproc.c:4382
#19 0x000000000041d87a in VTRun (xw=0x804cdc000) at charproc.c:6997
#20 0x0000000000442c01 in main (argc=3, argv=0x7fffffffe6d0) at main.c:2607
#6 0x0000000000445d34 in reapchild (n=20) at main.c:5177
5177 pid = wait(NULL);
Current language: auto; currently minimal
(gdb) l
5172 int olderrno = errno;
5173 int pid;
5174
5175 DEBUG_MSG("handle:reapchild\n");
5176
5177 pid = wait(NULL);
5178
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