ppisa commented on issue #18566:
URL: https://github.com/apache/nuttx/issues/18566#issuecomment-5153681369
I have compiled NuttX for x86_64 QEMU with Nano-X options and I receive
fault due attempt to dereference -1 pointer in
```
Breakpoint 2, getumask () at misc/lib_umask.c:82
82 info = task_get_info();
(gdb) n
83 return info->ta_umask;
(gdb) p info
$5 = (struct task_info_s *) 0xffffffffffffffff
```
The call stack is
```
#0 getumask () at misc/lib_umask.c:83
#1 0x00000001009422cc in nx_vopen (list=0x100a295e0, path=0x100a01d80 <buf>
"fonts/mwfonts.alias",
oflags=32, ap=0x100a61d28) at vfs/fs_open.c:295
#2 0x00000001009426d0 in open (path=0x100a01d80 <buf>
"fonts/mwfonts.alias", oflags=32)
at vfs/fs_open.c:454
#3 0x00000001009de283 in fopen (path=0x100a01d80 <buf>
"fonts/mwfonts.alias", mode=0x1009ef824 "r")
at stdio/lib_fopen.c:180
#4 0x00000001009b1f5f in mwfont_findalias (fontname=0x100a62158
"SystemFixed", height=0x100a61e9c,
width=0x100a61e98)
at
/home/pi/repo/nuttx/gsoc-mwin/apps/graphics/microwindows/microwindows/src/engine/devfont.c:88
#5 0x00000001009b21a1 in GdCreateFont (psd=0x1009f2c20 <scrdev>,
name=0x100a62158 "SystemFixed",
height=0, width=0, plogfont=0x0)
at
/home/pi/repo/nuttx/gsoc-mwin/apps/graphics/microwindows/microwindows/src/engine/devfont.c:176
#6 0x00000001009bdbd6 in SVR_GrCreateFontEx (name=0x100a62158
"SystemFixed", height=0, width=0,
plogfont=0x0) at microwindows/src/nanox/srvfunc.c:1459
#7 0x0000000100978a3c in GrCreateFontExWrapper (r=0x100a62150)
at microwindows/src/nanox/srvnet.c:817
#8 0x000000010097b10e in GsHandleClient (fd=7) at
microwindows/src/nanox/srvnet.c:2268
#9 0x0000000100976754 in GsSelect (timeout=0) at
microwindows/src/nanox/srvmain.c:549
#10 0x0000000100975fa7 in nanox_server_main (argc=1, argv=0x100a61b68)
at microwindows/src/nanox/srvmain.c:192
#11 0x000000010092343f in nxtask_startup (entrypt=0x100975c1d
<nanox_server_main>, argc=1,
argv=0x100a61b68) at sched/task_startup.c:72
#12 0x000000010090d2e0 in nxtask_start () at task/task_start.c:104
#13 0x873d01b80000122c in ?? ()
```
May it be that I have something strange in the
[defconfig](https://github.com/user-attachments/files/30623876/defconfig-usb-kbd-nxterm.txt)
, I attempt to start `nanoxterm` from serial console.
I start QEMU by
```
qemu-system-x86_64 -m 2G -s \
-enable-kvm \
-smp 1 \
-cpu host,+pcid,+x2apic,+tsc-deadline,+xsave,+rdrand \
-kernel "$SYSTEM_IMAGE" \
-device qemu-xhci -device usb-kbd -device usb-mouse \
-vga cirrus
```
and when it is running, I attach from GDB
```
gdb-multiarch \
-ex "target extended-remote :1234" \
-ex "b x86_64_fault_panic_isr" \
nuttx/nuttx
```
set breakpoints, continue and invoke `nanoxterm`. But may be I have
something broken on my side. But `mwexample` worked for me before switch. May
it be it is necessary to mount some tmpfs or something else? May be some stack
to small etc.
PS: I am on vacations out Internet reach during next week.
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