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https://issues.apache.org/jira/browse/MYNEWT-765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021734#comment-16021734
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Christopher Collins commented on MYNEWT-765:
--------------------------------------------
{quote}
2. Build bsncent app from
https://github.com/rymanluk/incubator-mynewt-core/tree/bsn with the following
configuration:
app=@apache-mynewt-core/apps/bsncent
bsp=@apache-mynewt-core/hw/bsp/native
build_profile=debug
syscfg=BLE_HS_DEBUG=1:BLE_MAX_CONNECTIONS=5:BLE_SM_BONDING=1:BLE_SM_IO_CAP=BLE_HS_IO_KEYBOARD_DISPLAY:BLE_SM_LEGACY=1:BLE_SM_MITM=1:BLE_SM_OUR_KEY_DIST=7:BLE_SM_SC=1:BLE_SOCK_LINUX_DEV=0:BLE_SOCK_USE_LINUX_BLUE=1:BLE_SOCK_USE_TCP=0:LOG_LEVEL=0:MCU_NATIVE_USE_SIGNALS=1:OS_MAIN_STACK_SIZE=512:SHELL_TASK=1
{quote}
MCU_NATIVE_USE_SIGNALS should probably be set to 0 here (not 1). From
{{hw/mcu/native/syscfg.yml}}:
{noformat}
MCU_NATIVE_USE_SIGNALS:
description: >
Whether to use POSIX signals to implement context switches. Valid
values are as follows:
1: More correctness; less stability. The OS tick timer will
cause a high-priority task to preempt a low-priority task.
This causes stability issues because a task can be preempted
while it is in the middle of a system call, potentially
causing deadlock or memory corruption.
0: Less correctness; more stability. The OS tick timer only
runs while the idle task is active. Therefore, a sleeping
high-priority task will not preempt a low-priority task due
to a timing event (e.g., delay or callout expired).
However, this version of sim does not suffer from the
stability issues that affect the "signals" implementation.
Unit tests should use 1. Long-running sim processes should use 0.
{noformat}
Setting this to 0 causes sim to use the new behavior implemented in
{{9864f55e53df0b945fa3482d9b9ea63109c09123}}.
Hopefully this is the problem. With this setting equal to 0, I have seen
memory corruption like this (typically when mmap() or sbrk() gets longjmped out
of (called via malloc()).
> os_mbuf memory corruption on native platform
> --------------------------------------------
>
> Key: MYNEWT-765
> URL: https://issues.apache.org/jira/browse/MYNEWT-765
> Project: Mynewt
> Issue Type: Bug
> Environment: bsncent app on native 32-bit Ubuntu 17.04
> Reporter: Michał Narajowski
> Priority: Minor
>
> h4. General description:
> There is a segmentation fault error in function {{ble_hs_log_mbuf}} in file
> {{net/nimble/host/src/ble_hs_log.c}} when receiving notifications at high
> rate. Tested using *bsncent* app from
> https://github.com/rymanluk/incubator-mynewt-core/tree/bsn and *bsnprph* also
> from https://github.com/apache/incubator-mynewt-core/tree/bsnbranch
> Data from HCI command overwrites the os_mbuf struct instead of being written
> to {{om->om_data}}. I tried to catch that memory violation earlier in code,
> but somehow it is only triggered in the {{ble_hs_log_mbuf}} function.
> h4. How to reproduce:
> 1. Build and flash *bsnprph* app from
> https://github.com/apache/incubator-mynewt-core/tree/bsnbranch with the
> following configuration:
> {quote}
> app=@apache-mynewt-core/apps/bsnprph
> bsp=@apache-mynewt-core/hw/bsp/nrf52dk
> build_profile=optimized
> {quote}
> 2. Build *bsncent* app from
> https://github.com/rymanluk/incubator-mynewt-core/tree/bsn with the following
> configuration:
> {quote}
> app=@apache-mynewt-core/apps/bsncent
> bsp=@apache-mynewt-core/hw/bsp/native
> build_profile=debug
> syscfg=BLE_HS_DEBUG=1:BLE_MAX_CONNECTIONS=5:BLE_SM_BONDING=1:BLE_SM_IO_CAP=BLE_HS_IO_KEYBOARD_DISPLAY:BLE_SM_LEGACY=1:BLE_SM_MITM=1:BLE_SM_OUR_KEY_DIST=7:BLE_SM_SC=1:BLE_SOCK_LINUX_DEV=0:BLE_SOCK_USE_LINUX_BLUE=1:BLE_SOCK_USE_TCP=0:LOG_LEVEL=0:MCU_NATIVE_USE_SIGNALS=1:OS_MAIN_STACK_SIZE=512:SHELL_TASK=1
> {quote}
> 3. It is possible to reproduce it using Mynewt controller (but then another
> issue shows up sometimes, described below) or some other controller like PTS
> with some hacks in ble_hs_startup.c to start controller.
> 4. Run *bsncent* app from 32bit Ubuntu
> Here is the backtrace from GDB:
> {quote}
> Program received signal SIGSEGV, Segmentation fault.
> __memcpy_sse2_unaligned () at
> ../sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S:651
> 651 ../sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S: No such file
> or directory.
> (gdb) bt
> #0 __memcpy_sse2_unaligned () at
> ../sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S:651
> #1 0x80009fc0 in os_mbuf_copydata (m=0x8008fb6c, off=0, len=1,
> dst=0x800746c7 <os_main_stack+32199>) at
> repos/apache-mynewt-core/kernel/os/src/os_mbuf.c:722
> #2 0x8001fb5a in ble_hs_log_mbuf (om=0x8008fb6c)
> at repos/apache-mynewt-core/net/nimble/host/src/ble_hs_log.c:32
> #3 0x8001f18c in ble_hs_hci_evt_acl_process (om=0x8008fb6c)
> at repos/apache-mynewt-core/net/nimble/host/src/ble_hs_hci_evt.c:631
> #4 0x80018c1f in ble_hs_process_rx_data_queue ()
> at repos/apache-mynewt-core/net/nimble/host/src/ble_hs.c:195
> #5 0x80019020 in ble_hs_event_data (ev=0x80075aec <ble_hs_rx_q+8>)
> at repos/apache-mynewt-core/net/nimble/host/src/ble_hs.c:379
> #6 0x80007009 in os_eventq_run (evq=0x80074908 <os_eventq_main>)
> at repos/apache-mynewt-core/kernel/os/src/os_eventq.c:172
> #7 0x80002308 in main (argc=0, argv=0x0) at
> repos/apache-mynewt-core/apps/bsncent/src/main.c:457
> {quote}
> h4. Another issue
> Actually, there is also a second problem. When using *blehci* as the
> controller the communication between central and peripheral freezes somewhere
> around GATT discovery most of the time. It happens quiet randomly.
> To reproduce it:
> 1. Build and flash *blehci* app from
> https://github.com/apache/incubator-mynewt-core/tree/bsnbranch with the
> following configuration:
> {quote}
> app=@apache-mynewt-core/apps/blehci
> bsp=@apache-mynewt-core/hw/bsp/nrf51dk
> build_profile=optimized
> syscfg=BLE_HCI_UART_FLOW_CTL=0:BLE_LL_STRICT_CONN_SCHEDULING=0:BLE_MAX_CONNECTIONS=5:BLE_PUBLIC_DEV_ADDR=(uint8_t\[6\])\{0x0a,
> 0x0b, 0x09, 0x09, 0x09, 0x00\}
> {quote}
> It happens on both nrf51 and ntf52.
> 2. From 32bit Ubuntu use btattach to attach *blehci* controller
> {quote}
> sudo tools/btattach -N -B /dev/ttyUSB0 -S 1000000
> {quote}
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