bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Mark A. Hershberger]

I've been experiencing crashes over the past few days or so with emacs.

The backtraces happen while working on a file, apparently when auto-save
is invoked

A full backtrace is thousands of lines long, but, before goes into a
loop you'll see something like:

#0  raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:51
        set = {__val = {18446744067266838239, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 268435456, 56701040, 1, 6051501, 18446744067266838271}}
        pid = <optimized out>
        tid = <optimized out>
#1  0x0000000000597dfa in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:400
No locals.
#2  0x0000000000630fa5 in die (msg=0x77c143 "0 <= nchars", file=0x77c060 "lisp.h", line=1488) at alloc.c:7096
No locals.
#3  0x0000000000591e2b in SCHARS (string=...) at lisp.h:1488
        nchars = -9223372036854775794
#4  0x0000000000695e03 in oblookup (obarray=..., ptr=0x78a2be "auto-save-hook", size=14, size_byte=14) at lread.c:4333
        hash = 14424
        obsize = 15121
        tail = {i = 0x51df70 <bidi_fetch_char+549>}
        bucket = {i = 0x5252eb0}
        tem = {i = 0xe59f60 <lispsym>}
#5  0x0000000000695618 in intern_1 (str=0x78a2be "auto-save-hook", len=14) at lread.c:4141
        obarray = {i = 0xec7015 <bss_sbrk_buffer+297653>}
        tem = {i = 0x0}
#6  0x0000000000594833 in intern (str=0x78a2be "auto-save-hook") at lisp.h:3855
No locals.
#7  0x00000000005f8cec in Fdo_auto_save (no_message=..., current_only=...) at fileio.c:5642
        old = 0x7d3c820
        b = 0x0
        tail = {i = 0xe42bc0 <sigsegv_stack+6016>}
        buf = {i = 0x9c30}
        hook = {i = 0x9c30}
        auto_saved = false
        do_handled_files = 5838245
        oquit = {i = 0x0}
        stream = 0x0
        count = 43
        orig_minibuffer_auto_raise = false
        old_message_p = false
        auto_save_unwind = {stream = 0x592160 <PSEUDOVECTORP+57>, auto_raise = 18}
#8  0x000000000059a6ff in shut_down_emacs (sig=11, stuff=...) at emacs.c:2122
No locals.
#9  0x0000000000597da1 in terminate_due_to_signal (sig=11, backtrace_limit=40) at emacs.c:383
No locals.
#10 0x00000000005c568e in handle_fatal_signal (sig=11) at sysdep.c:1772
No locals.
#11 0x00000000005c565f in deliver_thread_signal (sig=11, handler=0x5c5674 <handle_fatal_signal>) at sysdep.c:1746
        old_errno = 22
#12 0x00000000005c56c9 in deliver_fatal_thread_signal (sig=11) at sysdep.c:1784
No locals.
#13 0x00000000005c5885 in handle_sigsegv (sig=11, siginfo=0xe42f30 <sigsegv_stack+6896>, arg=0xe42e00 <sigsegv_stack+6592>) at sysdep.c:1869
        fatal = true
#14 <signal handler called>
No locals.
#15 0x000000000059173a in make_lisp_ptr (ptr=<error reading variable: Cannot access memory at address 0x7ffde7f3eff8>, 
    type=<error reading variable: Cannot access memory at address 0x7ffde7f3eff4>) at lisp.h:1168
        a = {i = 0x0}
#16 0x000000000062b7fa in live_cons_holding (m=0x840e8d0, p=0x843a330) at alloc.c:4442
        s = 0x843a330
        b = 0x843a000
        cp = 0x843a330 "C\243C\b"
        offset = 816
#17 0x000000000062b82c in live_cons_p (m=0x840e8d0, p=0x843a330) at alloc.c:4451
No locals.
#18 0x000000000062fb6c in mark_object (arg=...) at alloc.c:6468
        ptr = 0x843a330
        obj = {i = 0x843a333}
        po = 0x843a330
        m = 0x840e8d0
        cdr_count = 0
#19 0x000000000062fc09 in mark_object (arg=...) at alloc.c:6477
        ptr = 0x843a320
        obj = {i = 0x46cb9d3}
        po = 0x843a320
        m = 0x840e8d0
        cdr_count = 1
#20 0x000000000062eae9 in mark_vectorlike (ptr=0xbd35730) at alloc.c:6046
        size = 9
        i = 5
#21 0x000000000062f81a in mark_object (arg=...) at alloc.c:6415
        ptr = 0xbd35730
        pvectype = PVEC_NORMAL_VECTOR
        obj = {i = 0xbd35735}
        po = 0xbd35730
        m = 0x7b1c320
        cdr_count = 1
#22 0x000000000062fc09 in mark_object (arg=...) at alloc.c:6477
        ptr = 0xcbac210
        obj = {i = 0xcbac233}
        po = 0xcbac210
        m = 0xca46890
        cdr_count = 1
#23 0x000000000062fc09 in mark_object (arg=...) at alloc.c:6477
        ptr = 0xcbac1e0
        obj = {i = 0x46cb9d3}
        po = 0xcbac1e0
        m = 0xca46890
        cdr_count = 1
[........]

In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11, cairo version 1.14.8)
 of 2018-10-18 built on slink
Repository revision: 46106eec16ddb2294e06f9e482b9183777b90014
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9 (stretch)

Configured using:
 'configure --with-modules --with-xwidgets --with-gconf --with-cairo
 --enable-checking=yes,glyphs --enable-check-lisp-object-type
 'CFLAGS=-O0 -g3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO IMAGEMAGICK SOUND GPM DBUS GCONF
GSETTINGS GLIB NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT
LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS
XWIDGETS LIBSYSTEMD JSON LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  buffer-face-mode: t
  flx-ido-mode: t
  yahoo-weather-mode: t
  global-magit-file-mode: t
  override-global-mode: t
  show-paren-mode: t
  save-place-mode: t
  projectile-mode: t
  magit-wip-after-save-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  async-bytecomp-package-mode: t
  ido-everywhere: t
  display-time-mode: t
  direnv-mode: t
  auto-compile-on-load-mode: t
  auto-compile-on-save-mode: t
  auto-compile-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  transient-mark-mode: t

Load-path shadows:
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~/.emacs.d/elpa/org-plus-contrib-20181015/ob-css hides ~/work/code/emacs/lisp/org/ob-css
~/.emacs.d/elpa/org-plus-contrib-20181015/ob-ebnf hides ~/work/code/emacs/lisp/org/ob-ebnf
~/.emacs.d/elpa/org-plus-contrib-20181015/ob-calc hides ~/work/code/emacs/lisp/org/ob-calc
~/.emacs.d/elpa/org-plus-contrib-20181015/ob-forth hides ~/work/code/emacs/lisp/org/ob-forth

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bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Eli Zaretskii]

> From: "Mark A. Hershberger" <mah@everybody.org>
> Date: Thu, 18 Oct 2018 14:56:59 -0400
> 
> 
> The backtraces happen while working on a file, apparently when auto-save
> is invoked

No, this isn't a crash in auto-save-hook, it's a segfault in GC:

> #0  raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:51
>         set = {__val = {18446744067266838239, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 268435456, 56701040, 1, 6051501, 18446744067266838271}}
>         pid = <optimized out>
>         tid = <optimized out>
> #1  0x0000000000597dfa in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:400
> No locals.
> #2  0x0000000000630fa5 in die (msg=0x77c143 "0 <= nchars", file=0x77c060 "lisp.h", line=1488) at alloc.c:7096
> No locals.
> #3  0x0000000000591e2b in SCHARS (string=...) at lisp.h:1488
>         nchars = -9223372036854775794
> #4  0x0000000000695e03 in oblookup (obarray=..., ptr=0x78a2be "auto-save-hook", size=14, size_byte=14) at lread.c:4333
>         hash = 14424
>         obsize = 15121
>         tail = {i = 0x51df70 <bidi_fetch_char+549>}
>         bucket = {i = 0x5252eb0}
>         tem = {i = 0xe59f60 <lispsym>}
> #5  0x0000000000695618 in intern_1 (str=0x78a2be "auto-save-hook", len=14) at lread.c:4141
>         obarray = {i = 0xec7015 <bss_sbrk_buffer+297653>}
>         tem = {i = 0x0}
> #6  0x0000000000594833 in intern (str=0x78a2be "auto-save-hook") at lisp.h:3855
> No locals.
> #7  0x00000000005f8cec in Fdo_auto_save (no_message=..., current_only=...) at fileio.c:5642
>         old = 0x7d3c820
>         b = 0x0
>         tail = {i = 0xe42bc0 <sigsegv_stack+6016>}
>         buf = {i = 0x9c30}
>         hook = {i = 0x9c30}
>         auto_saved = false
>         do_handled_files = 5838245
>         oquit = {i = 0x0}
>         stream = 0x0
>         count = 43
>         orig_minibuffer_auto_raise = false
>         old_message_p = false
>         auto_save_unwind = {stream = 0x592160 <PSEUDOVECTORP+57>, auto_raise = 18}
> #8  0x000000000059a6ff in shut_down_emacs (sig=11, stuff=...) at emacs.c:2122
> No locals.
> #9  0x0000000000597da1 in terminate_due_to_signal (sig=11, backtrace_limit=40) at emacs.c:383
> No locals.
> #10 0x00000000005c568e in handle_fatal_signal (sig=11) at sysdep.c:1772
> No locals.
> #11 0x00000000005c565f in deliver_thread_signal (sig=11, handler=0x5c5674 <handle_fatal_signal>) at sysdep.c:1746
>         old_errno = 22
> #12 0x00000000005c56c9 in deliver_fatal_thread_signal (sig=11) at sysdep.c:1784
> No locals.
> #13 0x00000000005c5885 in handle_sigsegv (sig=11, siginfo=0xe42f30 <sigsegv_stack+6896>, arg=0xe42e00 <sigsegv_stack+6592>) at sysdep.c:1869
>         fatal = true
> #14 <signal handler called>
> No locals.
> #15 0x000000000059173a in make_lisp_ptr (ptr=<error reading variable: Cannot access memory at address 0x7ffde7f3eff8>, 
>     type=<error reading variable: Cannot access memory at address 0x7ffde7f3eff4>) at lisp.h:1168
>         a = {i = 0x0}
> #16 0x000000000062b7fa in live_cons_holding (m=0x840e8d0, p=0x843a330) at alloc.c:4442
>         s = 0x843a330
>         b = 0x843a000
>         cp = 0x843a330 "C\243C\b"
>         offset = 816
> #17 0x000000000062b82c in live_cons_p (m=0x840e8d0, p=0x843a330) at alloc.c:4451
> No locals.
> #18 0x000000000062fb6c in mark_object (arg=...) at alloc.c:6468
>         ptr = 0x843a330
>         obj = {i = 0x843a333}
>         po = 0x843a330
>         m = 0x840e8d0
>         cdr_count = 0

IOW, GC segfaults, and then Emacs tries to auto-save the session,
which fails.

Is it possible that GC hits a stack overflow?  Can you try manually
establishing whether that is the case by doing what stack_overflow in
sysdep.c does?

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Mark A. Hershberger]

Eli Zaretskii <eliz@gnu.org> writes:

> IOW, GC segfaults, and then Emacs tries to auto-save the session,
> which fails.
>
> Is it possible that GC hits a stack overflow?  Can you try manually
> establishing whether that is the case by doing what stack_overflow in
> sysdep.c does?

I don't know how to do this. I can follow directions if you can tell me
what to do, though.

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Eli Zaretskii]

> From: "Mark A. Hershberger" <mah@everybody.org>
> Cc: 33091@debbugs.gnu.org
> Date: Thu, 18 Oct 2018 16:15:51 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > IOW, GC segfaults, and then Emacs tries to auto-save the session,
> > which fails.
> >
> > Is it possible that GC hits a stack overflow?  Can you try manually
> > establishing whether that is the case by doing what stack_overflow in
> > sysdep.c does?
> 
> I don't know how to do this. I can follow directions if you can tell me
> what to do, though.

Given the backtrace you show in your report, I believe the commands
below should do that:

  (gdb) frame 13
  (gdb) p/x siginfo->si_addr
  (gdb) p/x stack_bottom
  (gdb) p/x current_thread->stack_top

Stack frame #13 is inside handle_sigsegv, according to your backtrace.

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Stefan Kangas]

Hi Mark,

Eli Zaretskii <eliz@gnu.org> writes:

>> From: "Mark A. Hershberger" <mah@everybody.org>
>> Cc: 33091@debbugs.gnu.org
>> Date: Thu, 18 Oct 2018 16:15:51 -0400
>>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> > IOW, GC segfaults, and then Emacs tries to auto-save the session,
>> > which fails.
>> >
>> > Is it possible that GC hits a stack overflow?  Can you try manually
>> > establishing whether that is the case by doing what stack_overflow in
>> > sysdep.c does?
>>
>> I don't know how to do this. I can follow directions if you can tell me
>> what to do, though.
>
> Given the backtrace you show in your report, I believe the commands
> below should do that:
>
>   (gdb) frame 13
>   (gdb) p/x siginfo->si_addr
>   (gdb) p/x stack_bottom
>   (gdb) p/x current_thread->stack_top
>
> Stack frame #13 is inside handle_sigsegv, according to your backtrace.

It seems like we need more information from you to make any progress
here.  Did you have a chance to look into this?

Thanks.

Best regards,
Stefan Kangas

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Mark A. Hershberger]

Stefan Kangas <stefan@marxist.se> writes:

> Eli Zaretskii <eliz@gnu.org> writes:
>
>>> From: "Mark A. Hershberger" <mah@everybody.org>
>>> Cc: 33091@debbugs.gnu.org
>>> Date: Thu, 18 Oct 2018 16:15:51 -0400
>>>
>>> Eli Zaretskii <eliz@gnu.org> writes:
>>>
>>> > IOW, GC segfaults, and then Emacs tries to auto-save the session,
>>> > which fails.
>>> >
>>> > Is it possible that GC hits a stack overflow?  Can you try manually
>>> > establishing whether that is the case by doing what stack_overflow in
>>> > sysdep.c does?
>>>
>>> I don't know how to do this. I can follow directions if you can tell me
>>> what to do, though.
>>
>> Given the backtrace you show in your report, I believe the commands
>> below should do that:
>>
>>   (gdb) frame 13
>>   (gdb) p/x siginfo->si_addr
>>   (gdb) p/x stack_bottom
>>   (gdb) p/x current_thread->stack_top
>>
>> Stack frame #13 is inside handle_sigsegv, according to your backtrace.
>
> It seems like we need more information from you to make any progress
> here.  Did you have a chance to look into this?

I did, but never followed up here.  It has been a couple of years, but I
may be experiencing this again with emacs built from HEAD.

In the meantime, I have emacs with debugging available, so maybe I can
get some more information from it if I can get something reproducible.

Mark.

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Stefan Kangas]

"Mark A. Hershberger" <mah@everybody.org> writes:

> I did, but never followed up here.  It has been a couple of years, but I
> may be experiencing this again with emacs built from HEAD.
>
> In the meantime, I have emacs with debugging available, so maybe I can
> get some more information from it if I can get something reproducible.

Thanks.  So you are still seeing this with the current master branch?

Best regards,
Stefan Kangas

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Mark A. Hershberger]

Stefan Kangas <stefan@marxist.se> writes:

> Thanks.  So you are still seeing this with the current master branch?

I'm not sure.  I'm seeing some spontaneous crashes recently, but haven't
gotten up the energy to track them down yet.

A lot has changed since then, so it probably isn't the same cause--for
instance, I'm using dynamically loaded vterm--but I'm not willing to
rule out the auto-save-hook connection without more info.

bug#33091: 27.0.50; Daily+ crashes in auto-save-hook

[Stefan Kangas]

"Mark A. Hershberger" <mah@everybody.org> writes:

> Stefan Kangas <stefan@marxist.se> writes:
>
>> Thanks.  So you are still seeing this with the current master branch?
>
> I'm not sure.  I'm seeing some spontaneous crashes recently, but haven't
> gotten up the energy to track them down yet.
>
> A lot has changed since then, so it probably isn't the same cause--for
> instance, I'm using dynamically loaded vterm--but I'm not willing to
> rule out the auto-save-hook connection without more info.

Thanks.  If we are not sure that it's the same issue, perhaps it would
make more sense for you to open a new bug when you can provide some more
information.  I'm therefore closing this bug now.