** Description changed:
I've the following code:
$ cat foo.sh
#!/bin/bash
function f() { f; }; f;
or:
$ cat test.sh
#!/bin/bash
function foo() { foo; }
foo
which both crashing in the following way:
$ ./foo.sh
Segmentation fault (core dumped)
is that normal?
dmesg on Linux shows me the following errors:
[ 146.205518] foo.sh[1999]: segfault at 7fff9b6c8ef8 ip 00000000004b7628 sp
00007fff9b6c8f00 error 6 in bash[400000+f2000]
[ 867.791687] foo.sh[2020]: segfault at 7ffc82a11fe8 ip 00000000004b7628 sp
00007ffc82a11ff0 error 6 in bash[400000+f2000]
[ 1023.472538] foo.sh[2049]: segfault at 7fff67f93f78 ip 00000000004b7628 sp
00007fff67f93f80 error 6 in bash[400000+f2000]
[ 1129.373294] foo.sh[2058]: segfault at 7ffcf059ff68 ip 00000000004b7628 sp
00007ffcf059ff70 error 6 in bash[400000+f2000]
On OSX I've got this:
VM Regions Near 0x7fff503edfb8:
- MALLOC_SMALL 00007ff65d800000-00007ff65e000000 [ 8192K] rw-/rwx
SM=PRV
+ MALLOC_SMALL 00007ff65d800000-00007ff65e000000 [ 8192K] rw-/rwx
SM=PRV
--> STACK GUARD 00007fff4cbee000-00007fff503ee000 [ 56.0M] ---/rwx
SM=NUL stack guard for thread 0
- Stack 00007fff503ee000-00007fff50bee000 [ 8192K] rw-/rwx
SM=PRV thread 0
+ Stack 00007fff503ee000-00007fff50bee000 [ 8192K] rw-/rwx
SM=PRV thread 0
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 bash 0x000000010f053ffa 0x10f012000 + 270330
1 bash 0x000000010f04f964 0x10f012000 + 252260
This happens in Ubuntu VM and on OSX.
+ I understand there is a infinite loop, however should bash crash with
+ SEGV? If it's out of resources (ulimit), it should be Killed by kernel
+ instead.
- I understand there is a infinite loop, however should bash crash with SEGV?
If it's out of resources (ulimit), it should be Killed by kernel instead.
+ In comparison, this is how this script is handled by zsh:
+
+ $ zsh test.sh
+ foo: maximum nested function level reached
+
+ so no SEGV here.
My versions of bash which I've tested:
GNU bash, version 4.3.42(1)-release (x86_64-apple-darwin15.0.0)
GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu)
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https://bugs.launchpad.net/bugs/1525436
Title:
SEGV on function loop
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