patacongo opened a new issue #3812:
URL: https://github.com/apache/incubator-nuttx/issues/3812
The apps/testing/ostest vfork test no longer works in the protected mode. A
hardfault occurs in the test immediately following the barrier test. The
stm32f4discovery:kostest configuration was used for testing. It has:
# CONFIG_PRIORITY_INHERITANCE is not set
CONFIG_ARCH_HAVE_VFORK=y
CONFIG_SCHED_WAITPID=y
So this means that the failure is in the vfork() test:
535 #if defined(CONFIG_PRIORITY_INHERITANCE) &&
!defined(CONFIG_DISABLE_PTHREAD)
536 /* Verify priority inheritance */
537
538 printf("\nuser_main: priority inheritance test\n");
539 priority_inheritance();
540 check_test_memory_usage();
541 #endif /* CONFIG_PRIORITY_INHERITANCE && !CONFIG_DISABLE_PTHREAD */
542
543 #if defined(CONFIG_ARCH_HAVE_VFORK) && defined(CONFIG_SCHED_WAITPID)
544 printf("\nuser_main: vfork() test\n");
545 vfork_test();
546 #endif
Here is an analysis of the hardfault:
up_assert: Assertion failed at file:armv7-m/arm_hardfault.c line: 135
task: ostest
up_registerdump: R0: 00000002 20001f00 200021a0 200021a0 20001058
20001040 00000000 00000000
up_registerdump: R8: 00000000 00000000 00000000 00000000 080067a3
20011288 080086e1 ffffffe8
Notice that the PC above is garbage. The return address of 080086e1 is
15611 0800863c <up_block_task>:
...
15683 80086dc: f000 fc6e bl 8008fbc <arm_switchcontext>
15684 80086e0: bf00 nop
So it appears to have failed in attempting a context switch. This would
happen to the new context is corrupt. My guess would be a bad set up of the
vforked() context. The commit that broke vfork() should be pretty easy to find.
up_registerdump: xPSR: 01000000 PRIMASK: 00000001 CONTROL: 00000000
up_registerdump: EXC_RETURN: ffffffe9
up_dumpstate: sp: 200110f8
up_dumpstate: stack base: 20010cb8
up_dumpstate: stack size: 000007c8
Here is some context from the stack. It does not reveal a lot because this
is the logic executing on the vfork'ed thread so it has very little history.
up_stackdump: 200110e0: 20011480 200110f8 200110e0 200110e0 200110f8
200111b4 20001040 00000000
up_stackdump: 20011100: 20011108 08008531 000007c8 20010cb8 200110f8
20001e60 20011128 0800861b
up_stackdump: 20011120: 00000087 20001fd4 00000087 08015240 0000000c
20001e60 20011140 08006815
up_stackdump: 20011140: 00000087 08015240 20011150 0800142d 0000000c
00000000 200111b4 00000003
0800142d corresponds to the return from the call to _assert from
arm_hardfault().
up_stackdump: 20011160: 20011168 20010001 ffffffe6 200111b4 20011178
08002c55 200111b4 00000003
08002c55 is the call to arm_hardfault() in irq_dispatch().
up_stackdump: 20011180: 20011188 00000003 00000000 080013b5 20011198
08000faf 200111b4 00000003
080013b5 is the address of arm_hardfault().
08000faf is return from the call to irq_dispatch() in arm_doirq().
up_stackdump: 200111a0: 200111a8 00000000 00000000 08000f29 200111b8
20011288 00000001 20001058
08000f29 is the call to arm_doirq() from exception_common().
up_stackdump: 200111c0: 20001040 00000000 00000000 00000000 00000000
00000000 00000000 ffffffe9
up_stackdump: 200111e0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 20011200: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 20011220: 00000002 20001f00 200021a0 200021a0 080067a3
080086e1 ffffffe8 01000000
up_stackdump: 20011240: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 20011260: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 20011280: 00000000 ffffffe9 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 200112a0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 200112c0: 00000000 00000000 00000001 20001f00 00000014
20001f00 08005a85 08008811
Most of the above is the state save from the exception.
08008811 is the return from the call to arm_fullcontextrestore() in up_exit()
up_stackdump: 200112e0: 08008fba 01000000 00000000 00000000 00000000
00000000 00000000 00000000
08008fba is in arm_fullcontextrestore()
up_stackdump: 20011300: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
up_stackdump: 20011320: 00000000 00000000 00000000 20011330 20011338
00000000 00001340 20001e60
up_stackdump: 20011340: 20011348 08003a9f 00000000 00000000 20011358
08003ac9 00000000 00000000
08003a9f is the address of exit()
08003ac9 is the return from _exit() in exit()
up_stackdump: 20011360: 00000000 20002100 20011370 08005a97 00000000
00000001 20011398 080014cf
08005a97 is the return from exit in STUB_exit().
080014cf is the return to dispatch_syscall().
up_stackdump: 20011380: 20001058 20001040 00000000 080270b1 00000018
00000000 00000000 0000000a
up_stackdump: 200113a0: 200113a8 200113a8 200113bc 00000000 200113b8
0802623d 0802c11c 0000d300
up_stackdump: 200113c0: 200113c8 080203d3 0001fea0 00000002 00000006
0000fff0 00001340 0001eb60
up_stackdump: 200113e0: 20010c80 00000005 00000000 00000005 00000000
00000000 20011400 08020065
up_stackdump: 20011400: 00000000 20010c80 00000005 0802018d 20011418
08008ef3 20010c80 00000005
08008ef3 is the return from sys_call4() in sys_call3().
up_stackdump: 20011420: 0802018d 00000004 00000000 20011438 00000000
01000000 20010c80 00000005
up_stackdump: 20011440: 0802018d 00000004 20011450 08008f3f 00000000
20010c80 00000005 0802018d
08008f3f is the return from sys_call3() in up_task_start().
up_stackdump: 20011460: 20011468 08003a87 00000000 00000001 20001e60
00000005 00000000 00000000
08003a87 is the return from up_task_start() in nxtask_start().
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