[BUG] sigsegv

[Sebastian Gniazdowski <sgniazdowski@gmail.com>]

I have to say that current HEAD has many sigsegv errors, at least twp.
The reported in this email is an older problem with alt-/ history
complete, I've had it also with 5.8. I'm still waiting for the 5.9
only problem to occur, it's quite random and hard to reproduce.
To trigger the error, press alt-/ some times.

#0  0x0000000000457868 in insertlinknode (list=list@entry=0x7ffff7abe368,
    node=0x7ffff55600d8, dat=0x7ffff556e8f0) at linklist.c:137
#1  0x00007ffff7bed6bf in histwgetfn (pm=<optimized out>) at parameter.c:1241
#2  0x0000000000467c46 in getvaluearr (v=0x7ffffffe79e0) at params.c:690
#3  0x0000000000467fe5 in getvaluearr (v=0x7ffffffe79e0) at params.c:2503
#4  getarrvalue (v=v@entry=0x7ffffffe79e0) at params.c:2470
#5  0x000000000048d24f in paramsubst (ret_flags=0x7ffffffe7ae4, pf_flags=4,
    qt=0, str=0x7ffffffe7970, n=0x7ffffffe7dd0, l=<optimized out>)
    at subst.c:2712
#6  stringsubst (list=list@entry=0x7ffffffe7d30, node=0x7ffffffe7dd0,
    pf_flags=pf_flags@entry=4, ret_flags=ret_flags@entry=0x7ffffffe7ae4,
    asssub=asssub@entry=0) at subst.c:322
#7  0x0000000000492595 in prefork (list=list@entry=0x7ffffffe7d30,
    flags=flags@entry=6, ret_flags=0x7ffffffe7ae4, ret_flags@entry=0x0)
    at subst.c:142
#8  0x000000000043083e in execcmd_exec (state=state@entry=0x7ffffffe91d0,
    eparams=eparams@entry=0x7ffffffe8e50, input=input@entry=0,
    output=output@entry=0, how=<optimized out>, how@entry=2,
    last1=<optimized out>, last1@entry=2, close_if_forked=-1) at exec.c:4138
#9  0x000000000043091e in execpline2 (state=state@entry=0x7ffffffe91d0,
    pcode=pcode@entry=1283, how=how@entry=2, input=0, output=0,
    last1=last1@entry=0) at exec.c:2003
#10 0x0000000000430c66 in execpline (state=state@entry=0x7ffffffe91d0,
    slcode=<optimized out>, how=how@entry=2, last1=0) at exec.c:1728
#11 0x000000000043243b in execlist (state=state@entry=0x7ffffffe91d0,
    dont_change_job=dont_change_job@entry=1, exiting=exiting@entry=0)
    at exec.c:1482
#12 0x0000000000432c32 in execode (p=0x146e1b0,
    dont_change_job=dont_change_job@entry=1, exiting=exiting@entry=0,
    context=context@entry=0x4a52c3 "loadautofunc") at exec.c:1263
#13 0x000000000043609d in execautofn_basic (do_exec=<optimized out>,
    state=<optimized out>, state=<optimized out>) at exec.c:5578
#14 0x00000000004302d6 in execcmd_exec (state=state@entry=0x7ffffffea860,
    eparams=eparams@entry=0x7ffffffea4e0, input=input@entry=0,
    output=output@entry=0, how=<optimized out>, how@entry=18,
    last1=last1@entry=2, close_if_forked=-1) at exec.c:4005
#15 0x000000000043091e in execpline2 (state=state@entry=0x7ffffffea860,
    pcode=pcode@entry=3, how=how@entry=18, input=0, output=0,
last1=last1@entry=0) at exec.c:2003
#16 0x0000000000430c66 in execpline (state=state@entry=0x7ffffffea860,
    slcode=<optimized out>, how=how@entry=18, last1=0) at exec.c:1728
#17 0x000000000043243b in execlist (state=state@entry=0x7ffffffea860,
    dont_change_job=dont_change_job@entry=1, exiting=exiting@entry=0)
    at exec.c:1482
#18 0x0000000000432c32 in execode (p=p@entry=0x590c10,
    dont_change_job=dont_change_job@entry=1, exiting=exiting@entry=0,
    context=context@entry=0x4a5263 "shfunc") at exec.c:1263
#19 0x0000000000433b82 in runshfunc (prog=prog@entry=0x590c10,
    wrap=wrap@entry=0x0, name=name@entry=0x7ffff7abe168 "_history")
    at exec.c:6148
#20 0x00007ffff7e48c6b in comp_wrapper (name=0x7ffff7abe168 "_history",
    w=0x0, prog=0x590c10) at complete.c:1588
#21 comp_wrapper (prog=0x590c10, w=0x0, name=0x7ffff7abe168 "_history")
    at complete.c:1553
#22 0x00000000004337ed in runshfunc (prog=0x590c10,
    wrap=0x7ffff7e64720 <wrapper>, name=0x7ffff7abe168 "_history")
    at exec.c:6132
…
…
(gdb) frame
#0  0x0000000000457868 in insertlinknode (list=list@entry=0x7ffff7abe368,
    node=0x7ffff55600d8, dat=0x7ffff556e8f0) at linklist.c:137
137         tmp = node->next;
(gdb) p node
$1 = (LinkNode) 0x7ffff55600d8
(gdb) p *node
Cannot access memory at address 0x7ffff55600d8

-- 
Best regards,
Sebastian Gniazdowski