Bash attempts to execute the stat syscall on the $OLDPWD variable on every
startup. This results in hard to diagnose hangs if the $OLDPWD variable
points to a directory on network filesystem that is inaccessible (for
example sshfs or nfs).
How to reproduce the hang:
- mount an sshfs directory
/usr/src/git/bash# sshfs user@host:/ /mnt/test -o cache=no,reconnect
- go to the mounted directory
/usr/src/git/bash# cd /mnt/test
- go back
/mnt/test# cd -
- disconnect the network cable (or shut down the remote host)
- execute some command or script via bash
/usr/src/git/bash# bash -c 'echo Hello World'
- bash hangs, because it tries to execute stat("/mnt/test")
Mikulas
---
variables.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: bash/variables.c
===================================================================
--- bash.orig/variables.c
+++ bash/variables.c
@@ -899,7 +899,7 @@ set_pwd ()
don't find OLDPWD in the environment, or it doesn't name a directory,
make a dummy invisible variable for OLDPWD, and mark it as exported. */
temp_var = find_variable ("OLDPWD");
- if (temp_var == 0 || value_cell (temp_var) == 0 || file_isdir (value_cell
(temp_var)) == 0)
+ if (temp_var == 0 || value_cell (temp_var) == 0)
{
temp_var = bind_variable ("OLDPWD", (char *)NULL, 0);
VSETATTR (temp_var, (att_exported | att_invisible));
