dovecot-pigeonhole running external script ends with signal 11

Wed Jan 4 07:49:07 UTC 2017

Hi Stephan

Am 03.01.2017 um 21:12 schrieb Stephan Bosch:

> Since you're using LMTP, you could try to run the lmtp service from
> command line in GDB. In essence, this looks as follows (you will need to
> run this as the mail user, e.g. vmail, or you can run it as root):
> 
> $ gdb --args /usr/lib/dovecot/lmtp 

I did so and it seems that libc.so.6 throws the error as I get the
following result (as root):

[New process 14843]
Program received signal SIGSEGV, Segmentation fault.
[Switching to process 14843]
0x00007ffff7241b71 in __strlen_sse2 () from /lib64/libc.so.6

bt full does not give me more than this

#0  0x00007ffff7241b71 in __strlen_sse2 () from /lib64/libc.so.6
No symbol table info available.
Cannot access memory at address 0x7fffffffd848

Then I installed debuginfo for glibc via debuginfo-install
glibc-2.17-157.el7_3.1.x86_64 and get

Program received signal SIGSEGV, Segmentation fault.
[Switching to process 18099]
__strlen_sse2 () at ../sysdeps/x86_64/strlen.S:31
31		movdqu	(%rdi), %xmm1

So this is an issue for glibc developpers? Just wonder why this error
does not occur if I call the script directly on cli or if I use
sieve-test program. It seems only to occur if the script called from dovecot

To compare I tried gdb as well as user vmail and get more detailed
information

[New process 20844]
Program received signal SIGSEGV, Segmentation fault.
[Switching to process 20844]
0x00007ffff7203694 in _IO_vfprintf_internal (s=s at entry=0x7fffffffd710,
format=<optimized out>,
    format at entry=0x555555764938 "chroot(%s) failed: Bad address",
ap=ap at entry=0x7fffffffd970) at vfprintf.c:1635
1635		  process_string_arg (((struct printf_spec *) NULL));

bt full does return much more in this case. I attached that output as
bt_full.txt to this mail (maybe it can be of help)

Thanks for your help

tobi

-------------- next part --------------
#0  0x00007ffff7203694 in _IO_vfprintf_internal (s=s at entry=0x7fffffffd710, format=<optimized out>, 
    format at entry=0x555555764938 <Address 0x555555764938 out of bounds>, ap=ap at entry=0x7fffffffd970) at vfprintf.c:1635
        len = <optimized out>
        string_malloced = <optimized out>
        step0_jumps = <error reading variable step0_jumps (Cannot access memory at address 0x7ffff7331d00)>
        space = <error reading variable space (Cannot access memory at address 0x7fffffffd1c0)>
        is_short = <error reading variable is_short (Cannot access memory at address 0x7fffffffd1a0)>
        use_outdigits = <error reading variable use_outdigits (Cannot access memory at address 0x7fffffffd198)>
        step1_jumps = <error reading variable step1_jumps (Cannot access memory at address 0x7ffff7331c80)>
        group = <error reading variable group (Cannot access memory at address 0x7fffffffd190)>
        prec = <error reading variable prec (Cannot access memory at address 0x7fffffffd1d8)>
        step2_jumps = <error reading variable step2_jumps (Cannot access memory at address 0x7ffff7331c00)>
        string = <optimized out>
        left = <error reading variable left (Cannot access memory at address 0x7fffffffd1c8)>
        is_long_double = <error reading variable is_long_double (Cannot access memory at address 0x7fffffffd19c)>
        width = <error reading variable width (Cannot access memory at address 0x7fffffffd1e0)>
        step3a_jumps = <error reading variable step3a_jumps (Cannot access memory at address 0x7ffff7331b80)>
        alt = <error reading variable alt (Cannot access memory at address 0x7fffffffd1e8)>
        showsign = <error reading variable showsign (Cannot access memory at address 0x7fffffffd1b8)>
        is_long = <error reading variable is_long (Cannot access memory at address 0x7fffffffd1d0)>
        is_char = <error reading variable is_char (Cannot access memory at address 0x7fffffffd188)>
        pad = <error reading variable pad (Cannot access memory at address 0x7fffffffd1b0)>
        step3b_jumps = <error reading variable step3b_jumps (Cannot access memory at address 0x7ffff7331a80)>
        step4_jumps = <error reading variable step4_jumps (Cannot access memory at address 0x7ffff7331b00)>
        is_negative = <optimized out>
        number = <optimized out>
        base = <optimized out>
        the_arg = <error reading variable the_arg (Cannot access memory at address 0x7fffffffd270)>
        spec = <error reading variable spec (Cannot access memory at address 0x7fffffffd200)>
        _buffer = <error reading variable _buffer (Cannot access memory at address 0x7fffffffd2c0)>
        _avail = <optimized out>
        thousands_sep = <error reading variable thousands_sep (Cannot access memory at address 0x7fffffffd1f0)>
        grouping = <error reading variable grouping (Cannot access memory at address 0x7fffffffd1f8)>
        done = <error reading variable done (Cannot access memory at address 0x7fffffffd238)>
        f = <error reading variable f (Cannot access memory at address 0x7fffffffd240)>
        lead_str_end = <optimized out>
        end_of_spec = <optimized out>
        work_buffer = <error reading variable work_buffer (Cannot access memory at address 0x7fffffffd2e0)>
        workstart = 0x0
        workend = <optimized out>
        ap_save = <error reading variable ap_save (Cannot access memory at address 0x7fffffffd2a0)>
        nspecs_done = <error reading variable nspecs_done (Cannot access memory at address 0x7fffffffd208)>
        save_errno = <optimized out>
        readonly_format = <error reading variable readonly_format (Cannot access memory at address 0x7fffffffd1ec)>
        args_malloced = <error reading variable args_malloced (Cannot access memory at address 0x7fffffffd220)>
        specs = <optimized out>
        specs_malloced = <error reading variable specs_malloced (Cannot access memory at address 0x7fffffffd20f)>
        jump_table = <error reading variable jump_table (Cannot access memory at address 0x7ffff7331d80)>
#1  0x00007ffff72c78d5 in ___vsnprintf_chk (s=0x555555764855 <Address 0x555555764855 out of bounds>, 
    s at entry=<error reading variable: Cannot access memory at address 0x7fffffffd878>, maxlen=<optimized out>, flags=1, slen=<optimized out>, 
    format=0x555555764938 <Address 0x555555764938 out of bounds>, args=0x7fffffffd970) at vsnprintf_chk.c:63
        sf = <error reading variable sf (Cannot access memory at address 0x7fffffffd710)>
        ret = <optimized out>