On Mon, Jan 12, 2015 at 11:50:56AM -0500, Chet Ramey wrote: > On 1/12/15 9:55 AM, wer...@linux-8jdz.site wrote: > > Configuration Information [Automatically generated, do not change]: > > Machine: x86_64 > > OS: linux-gnu > > Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.3 > > -L/home/abuild/rpmbuild/BUILD/bash-4.3/../readline-6.3 > > Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' > > -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' > > -DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' > > -DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -fmessage-length=0 > > -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector > > -funwind-tables -fasynchronous-unwind-tables -g -D_GNU_SOURCE > > -DRECYCLES_PIDS -Wall -g -Wuninitialized -Wextra -Wno-unprototyped-calls > > -Wno-switch-enum -Wno-unused-variable -Wno-unused-parameter > > -Wno-parentheses -ftree-loop-linear -pipe -DBNC382214=0 > > -DMUST_UNBLOCK_CHLD=1 -DIMPORT_FUNCTIONS_DEF=0 -fprofile-use > > uname output: Linux d136 3.15.0-rc7-3-desktop #1 SMP PREEMPT Wed May 28 > > 15:39:51 UTC 2014 (96f5b60) x86_64 x86_64 x86_64 GNU/Linux > > Machine Type: x86_64-suse-linux-gnu > > > > Bash Version: 4.3 > > Patch Level: 33 > > Release Status: release > > > > Description: > > Named fifo's causing hanging bash scripts like > > > > while IFS="|" read a b c ; do > > [shell code] > > done < <(shell code) > > > > can cause random hangs of the bash. An strace shows that the bash > > stays in wait4() > > And when you attach to one of the hanging bash processes using gdb, what > does the stack traceback look like?
Yes (and sorry for the wrong email address as this was done on a clean virtual
sysstem)
there are two hanging bash processes together with the find command:
werner 19062 0.8 0.0 11864 2868 ttyS0 S+ 10:21 0:00 bash -x
/tmp/brp-25-symlink
werner 19063 0.0 0.0 11860 1920 ttyS0 S+ 10:21 0:00 bash -x
/tmp/brp-25-symlink
werner 19064 0.2 0.0 16684 2516 ttyS0 S+ 10:21 0:00 find . -type l
-printf %p|%h|%l n
the gdb -p 19062 and gdb -p 19063 show
(gdb) bt
#0 0x00007f530818a65c in waitpid () from /lib64/libc.so.6
#1 0x000000000042b233 in waitchld (block=block@entry=1, wpid=19175) at
jobs.c:3235
#2 0x000000000042c6da in wait_for (pid=pid@entry=19175) at jobs.c:2496
#3 0x00000000004302e1 in command_substitute (string=string@entry=0x22ccd80
"dirname_int $link",
quoted=quoted@entry=1) at subst.c:5534
#4 0x00000000004704db in param_expand (string=string@entry=0x22cc8d0
"$(dirname_int $link)",
sindex=sindex@entry=0x7fff39f90ef0, quoted=quoted@entry=1,
expanded_something=expanded_something@entry=0x0,
contains_dollar_at=contains_dollar_at@entry=0x7fff39f90f20,
quoted_dollar_at_p=quoted_dollar_at_p@entry=0x7fff39f90f00,
had_quoted_null_p=had_quoted_null_p@entry=0x7fff39f90f10, pflags=0) at
subst.c:7970
#5 0x0000000000471123 in expand_word_internal (word=word@entry=0x22cc1a0,
quoted=quoted@entry=1,
isexp=isexp@entry=0,
contains_dollar_at=contains_dollar_at@entry=0x7fff39f91080,
expanded_something=expanded_something@entry=0x0) at subst.c:8393
#6 0x000000000047130f in expand_word_internal (word=word@entry=0x7fff39f91120,
quoted=quoted@entry=0,
isexp=isexp@entry=0, contains_dollar_at=contains_dollar_at@entry=0x0,
expanded_something=expanded_something@entry=0x0) at subst.c:8548
#7 0x0000000000472daf in call_expand_word_internal (e=0x0, c=0x0, i=0, q=0,
w=0x7fff39f91120) at subst.c:3299
#8 expand_string_assignment (string=string@entry=0x22cb159 "\"$(dirname_int
$link)\"", quoted=quoted@entry=0)
at subst.c:3387
#9 0x0000000000473110 in expand_string_if_necessary (string=<optimized out>,
string@entry=0x22cb159 "\"$(dirname_int $link)\"", quoted=quoted@entry=0,
func=func@entry=0x472d50 <expand_string_assignment>) at subst.c:3092
#10 0x0000000000473349 in do_assignment_internal (word=0x22cbbe0, expand=1) at
subst.c:2823
#11 0x000000000047776a in do_word_assignment (flags=<optimized out>,
word=<optimized out>) at subst.c:2912
#12 expand_word_list_internal (eflags=<optimized out>, list=<optimized out>) at
subst.c:9669
#13 expand_words (list=0xffffffffffffffff) at subst.c:9280
#14 0x0000000000461093 in execute_simple_command (simple_command=0x22c1ed0,
pipe_in=pipe_in@entry=-1,
pipe_out=pipe_out@entry=-1, async=async@entry=0,
fds_to_close=fds_to_close@entry=0x22ccce0)
at execute_cmd.c:4001
#15 0x00000000004629fc in execute_command_internal (command=0x22bc9e0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22ccce0)
at execute_cmd.c:788
#16 0x0000000000462ba6 in execute_connection (fds_to_close=0x22ccce0,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c0bd0) at execute_cmd.c:2497
#17 execute_command_internal (command=command@entry=0x22c0bd0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22ccce0)
at execute_cmd.c:946
#18 0x0000000000464d41 in execute_command (command=0x22c0bd0) at
execute_cmd.c:391
#19 0x0000000000462b6a in execute_connection (fds_to_close=0x22cbf90,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c2500) at execute_cmd.c:2495
#20 execute_command_internal (command=command@entry=0x22c2500,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22cbf90)
at execute_cmd.c:946
#21 0x0000000000464d41 in execute_command (command=0x22c2500) at
execute_cmd.c:391
#22 0x0000000000462b6a in execute_connection (fds_to_close=0x22c9d90,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c2680) at execute_cmd.c:2495
#23 execute_command_internal (command=command@entry=0x22c2680,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c9d90)
at execute_cmd.c:946
#24 0x0000000000464d41 in execute_command (command=0x22c2680) at
execute_cmd.c:391
#25 0x0000000000462b6a in execute_connection (fds_to_close=0x22c0770,
pipe_out=-1, pipe_in=-1, asynchronous=0,
---Type <return> to continue, or q <return> to quit---
command=0x22c27a0) at execute_cmd.c:2495
#26 execute_command_internal (command=command@entry=0x22c27a0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c0770)
at execute_cmd.c:946
#27 0x0000000000464d41 in execute_command (command=0x22c27a0) at
execute_cmd.c:391
#28 0x0000000000462b6a in execute_connection (fds_to_close=0x22c06e0,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c28c0) at execute_cmd.c:2495
#29 execute_command_internal (command=command@entry=0x22c28c0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c06e0)
at execute_cmd.c:946
#30 0x0000000000464d41 in execute_command (command=0x22c28c0) at
execute_cmd.c:391
#31 0x0000000000462b6a in execute_connection (fds_to_close=0x22c0560,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c29e0) at execute_cmd.c:2495
#32 execute_command_internal (command=command@entry=0x22c29e0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c0560)
at execute_cmd.c:946
#33 0x0000000000464d41 in execute_command (command=0x22c29e0) at
execute_cmd.c:391
#34 0x0000000000462b6a in execute_connection (fds_to_close=0x22c9d30,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c2ae0) at execute_cmd.c:2495
#35 execute_command_internal (command=command@entry=0x22c2ae0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c9d30)
at execute_cmd.c:946
#36 0x0000000000464d41 in execute_command (command=0x22c2ae0) at
execute_cmd.c:391
#37 0x0000000000462b6a in execute_connection (fds_to_close=0x22cc3f0,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c38b0) at execute_cmd.c:2495
#38 execute_command_internal (command=command@entry=0x22c38b0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22cc3f0)
at execute_cmd.c:946
#39 0x0000000000464d41 in execute_command (command=0x22c38b0) at
execute_cmd.c:391
#40 0x0000000000462b6a in execute_connection (fds_to_close=0x22c03e0,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c3de0) at execute_cmd.c:2495
#41 execute_command_internal (command=command@entry=0x22c3de0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c03e0)
at execute_cmd.c:946
#42 0x0000000000464d41 in execute_command (command=0x22c3de0) at
execute_cmd.c:391
#43 0x0000000000462b6a in execute_connection (fds_to_close=0x22ca230,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c5c90) at execute_cmd.c:2495
#44 execute_command_internal (command=command@entry=0x22c5c90,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22ca230)
at execute_cmd.c:946
#45 0x0000000000464d41 in execute_command (command=0x22c5c90) at
execute_cmd.c:391
#46 0x0000000000462b6a in execute_connection (fds_to_close=0x22b93f0,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c5da0) at execute_cmd.c:2495
#47 execute_command_internal (command=command@entry=0x22c5da0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22b93f0)
at execute_cmd.c:946
#48 0x0000000000464d41 in execute_command (command=0x22c5da0) at
execute_cmd.c:391
#49 0x0000000000462b6a in execute_connection (fds_to_close=0x22c5360,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c6440) at execute_cmd.c:2495
#50 execute_command_internal (command=command@entry=0x22c6440,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c5360)
---Type <return> to continue, or q <return> to quit---
at execute_cmd.c:946
#51 0x0000000000464d41 in execute_command (command=0x22c6440) at
execute_cmd.c:391
#52 0x0000000000462b6a in execute_connection (fds_to_close=0x22cd1d0,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c6540) at execute_cmd.c:2495
#53 execute_command_internal (command=command@entry=0x22c6540,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22cd1d0)
at execute_cmd.c:946
#54 0x0000000000464d41 in execute_command (command=0x22c6540) at
execute_cmd.c:391
#55 0x0000000000462b6a in execute_connection (fds_to_close=0x22c0580,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c9770) at execute_cmd.c:2495
#56 execute_command_internal (command=command@entry=0x22c9770,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c0580)
at execute_cmd.c:946
#57 0x0000000000464d41 in execute_command (command=0x22c9770) at
execute_cmd.c:391
#58 0x0000000000462b6a in execute_connection (fds_to_close=0x22bbf10,
pipe_out=-1, pipe_in=-1, asynchronous=0,
command=0x22c9cd0) at execute_cmd.c:2495
#59 execute_command_internal (command=command@entry=0x22c9cd0,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22bbf10)
at execute_cmd.c:946
#60 0x0000000000464d41 in execute_command (command=0x22c9cd0) at
execute_cmd.c:391
#61 0x0000000000425367 in execute_while_or_until (while_command=0x22c9c20,
type=type@entry=0)
at execute_cmd.c:3380
#62 0x0000000000464a2e in execute_while_command (while_command=<optimized out>)
at execute_cmd.c:3326
#63 execute_command_internal (command=command@entry=0x22c9d00,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c9e30)
at execute_cmd.c:886
#64 0x0000000000464d41 in execute_command (command=0x22c9d00) at
execute_cmd.c:391
#65 0x000000000041cabe in reader_loop () at eval.c:160
#66 0x000000000041c793 in main (argc=3, argv=0x7fff39f92778,
env=0x7fff39f92798) at shell.c:757
(gdb) bt
#0 0x00007f530818a65c in waitpid () from /lib64/libc.so.6
#1 0x000000000042b233 in waitchld (block=block@entry=1, wpid=19064) at
jobs.c:3235
#2 0x000000000042c6da in wait_for (pid=19064) at jobs.c:2496
#3 0x0000000000464339 in execute_command_internal (command=0x22ca360,
asynchronous=asynchronous@entry=0,
pipe_in=pipe_in@entry=-1, pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22ca5f0)
at execute_cmd.c:830
#4 0x00000000004860c2 in parse_and_execute (
string=string@entry=0x22ca4f0 "find . -type l -printf '%p|%h|%l\\n'
2>/dev/null",
from_file=from_file@entry=0x48b347 "process substitution",
flags=flags@entry=5) at evalstring.c:388
#5 0x00000000004728d4 in process_substitute (open_for_read_in_child=0,
string=0x22ca4f0 "find . -type l -printf '%p|%h|%l\\n' 2>/dev/null") at
subst.c:5214
#6 expand_word_internal (word=<optimized out>, quoted=quoted@entry=0,
isexp=isexp@entry=0,
contains_dollar_at=contains_dollar_at@entry=0x7fff39f92260,
expanded_something=expanded_something@entry=0x7fff39f92250) at subst.c:8273
#7 0x00000000004737db in shell_expand_word_list (tlist=0x22c9f80,
eflags=<optimized out>) at subst.c:9581
#8 0x0000000000477abe in expand_word_list_internal (eflags=<optimized out>,
list=<optimized out>)
at subst.c:9701
#9 expand_words_no_vars (list=0xffffffffffffffff, list@entry=0x22c9f20) at
subst.c:9289
#10 0x000000000043f605 in redirection_expand (word=word@entry=0x22c9dd0) at
redir.c:290
#11 0x000000000043f906 in do_redirection_internal
(redirect=redirect@entry=0x22c9df0, flags=flags@entry=3)
at redir.c:830
#12 0x000000000047b571 in do_redirections (list=<optimized out>,
flags=flags@entry=3) at redir.c:233
#13 0x0000000000462ff9 in execute_command_internal
(command=command@entry=0x22c9d00,
asynchronous=asynchronous@entry=0, pipe_in=pipe_in@entry=-1,
pipe_out=pipe_out@entry=-1,
fds_to_close=fds_to_close@entry=0x22c9e30) at execute_cmd.c:723
#14 0x0000000000464d41 in execute_command (command=0x22c9d00) at
execute_cmd.c:391
#15 0x000000000041cabe in reader_loop () at eval.c:160
#16 0x000000000041c793 in main (argc=3, argv=0x7fff39f92778,
env=0x7fff39f92798) at shell.c:757
Werner
--
"Having a smoking section in a restaurant is like having
a peeing section in a swimming pool." -- Edward Burr
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