[squeak-dev] ARMv8 linux VM segfault when scrolling MVC workspace
Eliot Miranda
eliot.miranda at gmail.com
Tue Dec 28 19:02:33 UTC 2021
Hi Tim,
if you can construct an image that at start up recreates the bug, without any user interaction, then I will look at it in gdb on my pi4 running manjaro. The trick is to start the doit with
Smalltalk snapshot: true thenQuit: true.
If you place the doit in an inspector on the morph that needs to be scrolled to cause the crash then the inspector should give you access to the variables that need to be messaged to scroll programmatically.
_,,,^..^,,,_ (phone)
> On Dec 27, 2021, at 5:21 PM, tim Rowledge <tim at rowledge.org> wrote:
>
> I was just trying out a workspace in an MVC project for reasons and discovered that (even with the latest sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak VM) scrolling text in a workspace will cause a segfault. This is running on a PI 4, 64bit release of Raspberry Pi OS, 20892 image.
>
> To test -
> open an MVC project
> open a Workspace - the location on screen does not appear to matter
> type a few characters with enough CRs to make the scrollbar suasage smaller than the scrollbar
> scroll using the sausage.
> boom
> pro$it?
>
> The bottom end of the stackdump is -
> C stack backtrace & registers:
> x0 0x598bc28464 x1 0x598bc12ce4 x2 0x6f4 x3 0x598bc28460
> x4 0x598bc133d8 x5 0x598bc28b58 x6 0xffffffffffffffff x7 0xffffffffffffffff
> x8 0xffffffffffffffff x9 0xffffffffffffffff x10 0xffffffffffffffff x11 0xffffffffffffffff
> x12 0xffffffffffffffff x13 0xffffffffffffffff x14 0x4 x15 0x7febfa33b0
> x16 0x557feb6e20 x17 0x7f83c9b2c0 x18 0x3b x19 0x5d8bc11044
> x20 0x3ffffe360 x21 0x3ffffe360 x22 0xb9 x23 0x6f4
> x24 0x557fecf000 x25 (nil) x26 0x5588d889f0 x27 (nil)
> x29 0x557fecf7a8 fp 0x7febfa3160 lr 0x557fdf7d1c sp 0x7febfa3160
> */lib/aarch64-linux-gnu/libc.so.6(+0x833b8)[0x7f83c9b3b8]
> ./sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak(+0x36018)[0x557fd56018]
> ./sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak(+0x37a5c)[0x557fd57a5c]
> linux-vdso.so.1(__kernel_rt_sigreturn+0x0)[0x7f83efc7c0]
> /lib/aarch64-linux-gnu/libc.so.6(+0x833b8)[0x7f83c9b3b8]
> ./sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak(+0xd7d1c)[0x557fdf7d1c]
> ./sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak(+0xd796c)[0x557fdf796c]
> ./sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak(+0xd4f00)[0x557fdf4f00]
> ./sqcogspur64ARMv8linuxht/lib/squeak/5.0-202112201228-64bit/squeak(+0xd53f0)[0x557fdf53f0]
> [0x5587d2ba08]
> /lib/aarch64-linux-gnu/libc.so.6(+0x169650)[0x7f83d81650]
>
>
> Smalltalk stack dump:
> 0x7febfa8db8 M DisplayScreen>copyBits:from:at:clippingBox:rule:fillColor: 0x55887ce788: a(n) DisplayScreen
> 0x7febfa8e28 M Paragraph>scrollUncheckedBy:withSelectionFrom:to: 0x5587f5eed8: a(n) Paragraph
> 0x7febfa8e88 M [] in Paragraph>scrollBy:withSelectionFrom:to: 0x5587f5eed8: a(n) Paragraph
> 0x7febfa8ec0 M DisplayScreen>deferUpdatesIn:while: 0x55887ce788: a(n) DisplayScreen
> 0x7febfa8f18 M Paragraph>scrollBy:withSelectionFrom:to: 0x5587f5eed8: a(n) Paragraph
>
> Can anybody else see this? On any other cpu/OS?
>
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> A computer's attention span is only as long as its extension cord.
>
>
>
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