Re: [LKP] [locking/ww_mutex] 659cf9f582: WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff

On Thu, Jan 26, 2017 at 11:20:55AM +0800, kernel test robot wrote: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > [ 0.000000] locking mismatches: ok | ok | ok | > [ 0.000000] EDEADLK handling: > [ 0.000000] ------------[ cut here ]------------ > [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff+0x62/0xf4 > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.10.0-rc3-00143-g659cf9f #1 > [ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > [ 0.000000] Call Trace: > [ 0.000000] dump_stack+0x19/0x27 > [ 0.000000] __warn+0xbf/0xe1 > [ 0.000000] warn_slowpath_null+0x1d/0x2a > (Just to remind you, truncated WARNs are very very annoying, this one for example doesn't show anything useful in the call trace).