fenconsultants opened a new issue #136: Hard fault in networking stack. URL: https://github.com/apache/incubator-nuttx/issues/136 Running the uIP based web server on an STM32F4 with Ethernet connection, I get errors and eventually a hard fault provoked by loading multiple pages (opening multiple connections on port 80) in quick succession, e.g. by loading a web page that includes a couple of css files, a couple of js files and a couple of images. The errors are: `tcp_datahandler: ERROR: Failed to create new I/O buffer chain` This is from iob_tryalloc failing to allocate a buffer. It is repeated multiple times per page load. More rarely I see: `tcp_datahandler: ERROR: Failed to add data to the I/O buffer chain: -12` Initially this resulted in most of the connections failing and httpd processes hanging, but after setting CONFIG_NET_TCPBACKLOG_CONNS to 8 the page almost always fully loads (connections succeed) despite the errors. However within a minute or two of repeatedly reloading pages, I get a hard fault. ``` up_hardfault: PANIC!!! Hard fault: 40000000 up_assert: Assertion failed at file:armv7-m/up_hardfault.c line: 148 task: <pthread> up_registerdump: R0: 00000000 200153e0 20010820 00000000 00000000 20012a60 00000000 ffffffff up_registerdump: R8: ffffffff 00000000 2001bd62 00000002 000012c0 200163d8 080197eb 08012860 up_registerdump: xPSR: 00000000 PRIMASK: 00000001 CONTROL: 00000000 up_registerdump: EXC_RETURN: fffffff9 up_dumpstate: sp: 200014a8 up_dumpstate: IRQ stack: up_dumpstate: base: 20001500 up_dumpstate: size: 00000800 up_stackdump: 200014a0: 20001500 08000cd7 00000001 00000000 00000002 000012c0 200163d8 080197eb up_stackdump: 200014c0: 08012860 08021178 00000003 0800110d 080010cd 2000d8c0 2001638c 080014fd up_stackdump: 200014e0: 00000001 080011f5 00000001 2001638c 20012a60 00000000 ffffffff 08000dc3 up_dumpstate: sp: 200163d8 up_dumpstate: User stack: up_dumpstate: base: 20016478 up_dumpstate: size: 00000ffc up_stackdump: 200163c0: 20010820 00000000 000012c0 080197eb 08012860 00000000 2000bba8 20012ab8 up_stackdump: 200163e0: 20012ab8 0800f275 20012ab8 20012a60 2001add6 2001ac70 08028030 0800e399 up_stackdump: 20016400: 2000bba8 20012ab8 2001add6 0800e4e7 2001bda4 08014087 2001bda4 08007ff9 up_stackdump: 20016420: 20015360 08019255 00000000 0000000b 2001be34 2001adb8 00000000 20015360 up_stackdump: 20016440: 20015460 20012880 2001288c 00000000 00000000 00000000 00000000 08018aa9 up_stackdump: 20016460: 00000000 00000000 00000000 00000000 00000000 00000000 000101aa 00000001 ``` R15 is inside _net_timedwait and R14 is inside nxsem_wait. I've attached the map. [System.map.txt](https://github.com/apache/incubator-nuttx/files/4090296/System.map.txt) Also my config: [defconfig.txt](https://github.com/apache/incubator-nuttx/files/4090300/defconfig.txt)
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