Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-24 Thread Andy Shevchenko
On Tue, Jan 23, 2018 at 5:52 PM, Alan Cox wrote: > On Wed, 17 Jan 2018 09:24:32 -0800 > Shankara Pailoor wrote: > >> Hi Greg, >> >> Sorry for that. Here is the stack trace. C Program below > > > >> serial_in drivers/tty/serial/8250/8250.h:111

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-24 Thread Andy Shevchenko
On Tue, Jan 23, 2018 at 5:52 PM, Alan Cox wrote: > On Wed, 17 Jan 2018 09:24:32 -0800 > Shankara Pailoor wrote: > >> Hi Greg, >> >> Sorry for that. Here is the stack trace. C Program below > > > >> serial_in drivers/tty/serial/8250/8250.h:111 [inline] >> wait_for_xmitr+0x8a/0x1d0

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-23 Thread Alan Cox
On Wed, 17 Jan 2018 09:24:32 -0800 Shankara Pailoor wrote: > Hi Greg, > > Sorry for that. Here is the stack trace. C Program below > serial_in drivers/tty/serial/8250/8250.h:111 [inline] > wait_for_xmitr+0x8a/0x1d0 drivers/tty/serial/8250/8250_port.c:2033 >

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-23 Thread Alan Cox
On Wed, 17 Jan 2018 09:24:32 -0800 Shankara Pailoor wrote: > Hi Greg, > > Sorry for that. Here is the stack trace. C Program below > serial_in drivers/tty/serial/8250/8250.h:111 [inline] > wait_for_xmitr+0x8a/0x1d0 drivers/tty/serial/8250/8250_port.c:2033 >

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-17 Thread Shankara Pailoor
Hi Greg, Sorry for that. Here is the stack trace. C Program below TCP: request_sock_TCP: Possible SYN flooding on port 20003. Sending cookies. Check SNMP counters. TCP: request_sock_TCP: Possible SYN flooding on port 20003. Sending cookies. Check SNMP counters. TCP: request_sock_TCP: Possible

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-17 Thread Shankara Pailoor
Hi Greg, Sorry for that. Here is the stack trace. C Program below TCP: request_sock_TCP: Possible SYN flooding on port 20003. Sending cookies. Check SNMP counters. TCP: request_sock_TCP: Possible SYN flooding on port 20003. Sending cookies. Check SNMP counters. TCP: request_sock_TCP: Possible

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-17 Thread Greg KH
On Wed, Jan 17, 2018 at 08:53:06AM -0800, Shankara Pailoor wrote: > Hi, > > Syzkaller found the following rcu stall report in Linux 4.15-rc1: > https://pastebin.com/NyZ9JdRv > > The following C program reproduces it: https://pastebin.com/gqwDWWpA > > Configs Here: https://pastebin.com/v6M3iKi1

Re: RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-17 Thread Greg KH
On Wed, Jan 17, 2018 at 08:53:06AM -0800, Shankara Pailoor wrote: > Hi, > > Syzkaller found the following rcu stall report in Linux 4.15-rc1: > https://pastebin.com/NyZ9JdRv > > The following C program reproduces it: https://pastebin.com/gqwDWWpA > > Configs Here: https://pastebin.com/v6M3iKi1

RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-17 Thread Shankara Pailoor
Hi, Syzkaller found the following rcu stall report in Linux 4.15-rc1: https://pastebin.com/NyZ9JdRv The following C program reproduces it: https://pastebin.com/gqwDWWpA Configs Here: https://pastebin.com/v6M3iKi1 Regards, Shankara

RCU stall in 8250 serial driver Linux 4.15-rc1

2018-01-17 Thread Shankara Pailoor
Hi, Syzkaller found the following rcu stall report in Linux 4.15-rc1: https://pastebin.com/NyZ9JdRv The following C program reproduces it: https://pastebin.com/gqwDWWpA Configs Here: https://pastebin.com/v6M3iKi1 Regards, Shankara