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Groups > gnu.bash.bug > #11444
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| From | Oleg Popov <dev-random@mail.ru> |
| Newsgroups | gnu.bash.bug |
| Subject | Race condition in read -t |
| Date | Sat, 29 Aug 2015 02:52:49 +0300 |
| Lines | 25 |
| Approved | bug-bash@gnu.org |
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Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: x86_64-pc-linux-gnu-gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I./include -I. -I./include -I./lib -DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' -DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin' -DSYS_BASHRC='/etc/bash/bashrc' -DSYS_BASH_LOGOUT='/etc/bash/bash_logout' -DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -O2 -pipe -march=native -mtune=native uname output: Linux thinkpad 4.1.6-hardened-r1 #1 SMP Wed Aug 26 04:44:35 MSK 2015 x86_64 AMD A6-3400M APU with Radeon(tm) HD Graphics AuthenticAMD GNU/Linux Machine Type: x86_64-pc-linux-gnu Bash Version: 4.3 Patch Level: 42 Release Status: release Description: Function reset_alarm() in read.def first resets SIGALRM handler and then cancels alarm. Sometimes, SIGALRM comes between those 2 calls and crashes (sub)shell. Repeat-By: while sleep 0.00$RANDOM; do echo test; done | while true; do read -t 0.00$RANDOM; echo $REPLY; done (usually takes a few seconds to crash, sometimes minutes) Fix: Swap the lines in reset_alarm().
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Race condition in read -t Oleg Popov <dev-random@mail.ru> - 2015-08-29 02:52 +0300
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