On 04/17/2016, 02:33 PM, Matwey V. Kornilov wrote: > Hello, > > When running 4.6-rc3 (please find used config attached) on BeagleBone Black with 8250_omap serial driver I see the following hung. > > When test application a.out run twice (test.c source code attached here) the following happens: > > # ./a.out # ./a.out > (hung here, may be interrupted with Ctrl-C) > > Trace from echo t > /proc/sysrq-trigger is the following: > > апр 17 12:29:23 nohostname kernel: a.out S c0c3544c 0 922 882 0x00000000 > апр 17 12:29:23 nohostname kernel: [<c0c3544c>] (__schedule) from [<c0c3597c>] (schedule+0x5c/0xd0) > апр 17 12:29:23 nohostname kernel: [<c0c3597c>] (schedule) from [<c0794820>] (tty_port_block_til_ready+0x11c/0x2a0) > апр 17 12:29:23 nohostname kernel: [<c0794820>] (tty_port_block_til_ready) from [<c07abfb0>] (uart_open+0x11c/0x158) ... > > I don't think that open() user-space call should be blocked under such circumstances, so I think that this is rather an issue within the kernel. > I've found that the effect dissapears when termios calls are dropped from test.c I suppose the memset in the program cleared CLOCAL and the subsequent open waits for carrier... thanks, -- js suse labs -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
