Hi Peter,
My approach is kind of a headache since bisecting over an area
where apps and NuttX are not always in sync is a major limitation
of the split repo. My approach is usually:
- Start the bisect in kernel
- Check the commit date of the current HEAD
- Check out to a commit of the same/similar date in apps
- Build
- Mentally note if this commit was good or bad based on the
results of running the image
- make distclean (avoids artifacts carrying over between
bisections and breaking everything)
- Mark commit good or bad with git bisect
Then basically repeat this until bisecting is finished. It sucks
and I did suggest a script in /tools/ to try and automate most of
this, but I never got around to writing it.
I would suggest you start by checking for the issue on a stable
release (i.e. 12.12.0) to see if that's a good commit you can
start from. Usually those releases have a higher degree of
testing because everyone who voted for the release ran some
images on their hardware.
That's honestly a lot of work but you never know if it'll end up
being faster than trying to triage with logs!
Matteo
On Fri, Feb 6, 2026, 4:50 PM Nathan Hartman
<[email protected]> wrote:
First place I would look: is the stack overflowing? (You
could try enabling some of the stack debugging features.)
On Fri, Feb 6, 2026 at 4:34 PM Peter Barada
<[email protected]> wrote:
Matteo,
I don't know if this was working before but if you can
suggest a good
starting point I can cycle through git bisect to narrow
down to the
failing commit. What's the best approach to using git
bisect across
multiple repos (since changes in nuttx may have necessary
changes in
nuttx-apps and need to keep them in sync at each build
point)?
As an aside, I also I have a nucleo-f446re board 'time
ls' works fine there.
Further, does anyone have GDB scripts that make it easier
to decipher
Nuttx structures from memory (e.g. dump task/semaphore
lists, etc)? I've
started cobbling snippets but figure I'd ask before
reinventing the wheel.
On 2/6/26 16:12, Matteo Golin wrote:
> Hi Peter,
>
> If you happen to know that this was working before on
an older NuttX
> version, you could use git bisect to narrow down the
breaking commit.
> Then the issue might be clearer.
>
> Best,
> Matteo
>
> On Fri, Feb 6, 2026, 4:09 PM Peter Barada
<[email protected]> wrote:
>
> I have a STM32 Nucleo-h753zi board - and configured
a build for
> nucleo-743zi2:nsh (which is closest board/chip; the
stm32h753zi is
> same
> as stm32h743zi but h753zi includes crypto
acceleration hardware).
>
> Build works, but if I boot and try 'time ls' nuttx
faults:
>
> nsh> uname -a
> NuttX 0.0.0 9ecfff0833 Feb 6 2026 15:45:28 arm
nucleo-h743zi2
> nsh> time ls
> /:
> dev/
>
> 0.00dump_assert_info: Current Version: NuttX 0.0.0
9ecfff0833
> Feb 6 2026 15:45:28 arm
> dump_assert_info: Assertion failed panic: at file:
:0 task:
> <noname> process: <noname> 0x800c9fd
> up_dump_register: R0: 0801e624 R1: 0000000a R2:
00000050 R3: 0000000a
> up_dump_register: R4: 00000001 R5: 240000e4 R6:
00000000 FP: 00000000
> up_dump_register: R8: 00000000 SB: 00000000 SL:
00000000 R11: 00000000
> up_dump_register: IP: 00000000 SP: 38000c08 LR:
080059db PC: 08005984
> up_dump_register: xPSR: 41000000 BASEPRI: 00000000
CONTROL: 00000000
> up_dump_register: EXC_RETURN: ffffffe9
> dump_stackinfo: User Stack:
> dump_stackinfo: base: 0x38000518
> dump_stackinfo: size: 00002000
> dump_stackinfo: sp: 0x38000c08
> stack_dump: 0x38000be8: 00000000 00000000 00000000
00000000
> 00000000 00000000 00000000 00000000
> stack_dump: 0x38000c08: 0000000a 0801e624 0801e624
38000200
> 38000fac 00000000 0801e624 080172c1
> stack_dump: 0x38000c28: 00000000 0801e624 38000200
38000158
> 00000000 00000000 38000fac 0800caa1
> stack_dump: 0x38000c48: 00000000 0800cc77 0801e624
000002fc
> 38000500 00000001 00000001 38000cf0
> stack_dump: 0x38000c68: 38000cf0 00000008 38000200
00000000
> 00000000 0800ca79 38000500 00000001
> stack_dump: 0x38000c88: 00000064 38000cf0 00000064
0800ca33
> 38000500 00000001 00000064 00000000
> stack_dump: 0x38000ca8: 00000000 08009325 00000000
38000500
> 00000001 0800c9fd 00000000 080052f1
> stack_dump: 0x38000cc8: 00000000 38000500 00000000
38000158
> 00000001 00000001 00000000 00000000
> stack_dump: 0x38000ce8: 00000000 00000000 00000000
00000000
> 00000000 00000000 00000000 00000000
> dump_tasks: PID GROUP PRI POLICY TYPE NPX
STATE EVENT
> SIGMASK STACKBASE STACKSIZE COMMAND
> dump_task: 0 0 0 FIFO Kthread - Ready
> 0000000000000000 0x240018b0 1000 <noname>
> dump_task: 1 1 100 RR Task - Running
> 0000000000000000 0x38000518 2000 <noname> ��]���&
>
> Wondering if anyone has run across this before?
Backtrace shows:
>
> Program received signal SIGTRAP, Trace/breakpoint trap.
> exception_common () at armv7-m/arm_exception.S:127
> 127 mrs r0, ipsr
/* R0=exception
> number */
> where
> #0 exception_common () at armv7-m/arm_exception.S:127
> #1 <signal handler called>
> #2 0x08005984 in env_cmpname (pszname=0x801e624 "PS1",
> peqname=0xa <error: Cannot access memory at
address 0xa>)
> at environ/env_findvar.c:50
> #3 0x080059da in env_findvar (group=0x38000200,
pname=0x801e624
> "PS1")
> at environ/env_findvar.c:105
> #4 0x080172c0 in getenv (name=0x801e624 "PS1") at
> environ/env_getenv.c:89
> #5 0x0800caa0 in nsh_update_prompt () at
nsh_prompt.c:77
> #6 0x0800cc76 in nsh_session (pstate=0x38000cf0,
login=1, argc=1,
> argv=0x38000500) at nsh_session.c:249
> #7 0x0800ca78 in nsh_consolemain (argc=1,
argv=0x38000500)
> at nsh_consolemain.c:77
> #8 0x0800ca32 in nsh_main (argc=1,
argv=0x38000500) at nsh_main.c:76
> #9 0x08009324 in nxtask_startup (entrypt=0x800c9fd
<nsh_main>,
> argc=1,
> argv=0x38000500) at sched/task_startup.c:72
> #10 0x080052f0 in nxtask_start () at
task/task_start.c:104
> #11 0x00000000 in ?? ()
>
> Scratching the surface shows that env_findvar() is
called with group
> pointer of 0x38000200, group->tg_envp is
0x380004b8, both which are
> reasonable. But *group->tg_envp is 0xA. Further if
I "watch
> *(int*)0x380004b8" in GDB, I see it is getting
overwritten by
> up_serialout() invoked from stm32_serial.c::up_send.
>
> Any suggestions on how I can best track this down
further?
>
> Thanks in advance!
>
> --
> Peter Barada
> [email protected]
>
--
Peter Barada
[email protected]
