Re: error "sh: 1: exec: ...: File exists" with dash
On 2016-03-03 12:52:34 +0100, Jean-Baptiste Thomas wrote:
> EEXIST does sounds like a strange reason for exec(2) to fail.
> Did you strace -f to confirm that EEXIST is indeed set by
> execve() ?
I could reproduce the error after regenerating my config (see my
other mail about that). And yes, it comes from execve(). I could
do a simpler test, always reproducible:
francine:~> touch bin/tst
francine:~> cat bin/tst
cassis:~> cat tst.c
int main (void)
{ return 0; }
cassis:~> gcc -O3 tst.c -o tst
cassis:~> mv tst bin/
mv: overwrite ‘bin/tst’? y
At this point, I have to wait for 15 seconds for the "mv" to be
done: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=799838
After that:
francine:~> strace -f -o tst.out sh -c "exec $HOME/bin/tst"
sh: 1: exec: /home/vlefevre/bin/tst: File exists
zsh: exit 2 strace -f -o tst.out sh -c "exec $HOME/bin/tst"
francine:~[2]> cat tst.out
21573 execve("/bin/sh", ["sh", "-c", "exec /home/vlefevre/bin/tst"], [/* 120 vars */]) = 0
21573 brk(0) = 0x7f4aded7d000
21573 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
21573 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4aded46000
21573 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
21573 open("/home/vlefevre/debian8/gmp/westmere/lib/tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/home/vlefevre/debian8/gmp/westmere/lib/tls/x86_64", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/home/vlefevre/debian8/gmp/westmere/lib/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/home/vlefevre/debian8/gmp/westmere/lib/tls", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/home/vlefevre/debian8/gmp/westmere/lib/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/home/vlefevre/debian8/gmp/westmere/lib/x86_64", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/home/vlefevre/debian8/gmp/westmere/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/home/vlefevre/debian8/gmp/westmere/lib", {st_mode=S_IFDIR|0755, st_size=13, ...}) = 0
21573 open("/usr/local/lib/tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/usr/local/lib/tls/x86_64", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/usr/local/lib/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/usr/local/lib/tls", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/usr/local/lib/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/usr/local/lib/x86_64", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/usr/local/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/usr/local/lib", {st_mode=S_IFDIR|S_ISGID|0775, st_size=4096, ...}) = 0
21573 open("/lib64/tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/lib64/tls/x86_64", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/lib64/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/lib64/tls", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/lib64/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
21573 stat("/lib64/x86_64", 0x7ffec78d5b00) = -1 ENOENT (No such file or directory)
21573 open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
21573 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\34\2\0\0\0\0\0"..., 832) = 832
21573 fstat(3, {st_mode=S_IFREG|0755, st_size=1738176, ...}) = 0
21573 mmap(NULL, 3844640, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4ade55f000
21573 mprotect(0x7f4ade701000, 2093056, PROT_NONE) = 0
21573 mmap(0x7f4ade900000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a1000) = 0x7f4ade900000
21573 mmap(0x7f4ade906000, 14880, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f4ade906000
21573 close(3) = 0
21573 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4aded45000
21573 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4aded44000
21573 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4aded43000
21573 arch_prctl(ARCH_SET_FS, 0x7f4aded44700) = 0
21573 mprotect(0x7f4ade900000, 16384, PROT_READ) = 0
21573 mprotect(0x7f4aded48000, 12288, PROT_READ) = 0
21573 mprotect(0x7f4adeb2a000, 4096, PROT_READ) = 0
21573 getpid() = 21573
21573 rt_sigaction(SIGCHLD, {0x7f4adeb3efd0, ~[RTMIN RT_1], SA_RESTORER, 0x7f4ade5940e0}, NULL, 8) = 0
21573 geteuid() = 1114
21573 brk(0) = 0x7f4aded7d000
21573 brk(0x7f4aded9e000) = 0x7f4aded9e000
21573 getppid() = 21568
21573 stat("/home/vlefevre", {st_mode=S_IFDIR|0751, st_size=328, ...}) = 0
21573 stat(".", {st_mode=S_IFDIR|0751, st_size=328, ...}) = 0
21573 rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
21573 rt_sigaction(SIGINT, {0x7f4adeb3efd0, ~[RTMIN RT_1], SA_RESTORER, 0x7f4ade5940e0}, NULL, 8) = 0
21573 rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0
21573 rt_sigaction(SIGQUIT, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7f4ade5940e0}, NULL, 8) = 0
21573 rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0
21573 rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7f4ade5940e0}, NULL, 8) = 0
21573 execve("/home/vlefevre/bin/tst", ["/home/vlefevre/bin/tst"], [/* 120 vars */]) = -1 EEXIST (File exists)
21573 write(2, "sh: 1: exec: ", 13) = 13
21573 write(2, "/home/vlefevre/bin/tst: File exi"..., 35) = 35
21573 write(2, "\n", 1) = 1
21573 exit_group(2) = ?
21573 +++ exited with 2 +++
After this test, the other points from your mail no longer apply.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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