Re: [PATCH v2] sample-trace-array: Fix sleeping function called from invalid context

[Kefeng Wang]

On 2020/6/10 0:29, Divya Indi wrote:
> On 6/9/20 6:51 AM, Kefeng Wang wrote:
> >   BUG: sleeping function called from invalid context at kernel/locking/mutex.c:935
> >   in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/5
> >   1 lock held by swapper/5/0:
> >    #0: ffff80001002bd90 (samples/ftrace/sample-trace-array.c:38){+.-.}-{0:0}, at: call_timer_fn+0x8/0x3e0
> >   CPU: 5 PID: 0 Comm: swapper/5 Not tainted 5.7.0+ #8
> >   Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
> >   Call trace:
> >    dump_backtrace+0x0/0x1a0
> >    show_stack+0x20/0x30
> >    dump_stack+0xe4/0x150
> >    ___might_sleep+0x160/0x200
> >    __might_sleep+0x58/0x90
> >    __mutex_lock+0x64/0x948
> >    mutex_lock_nested+0x3c/0x58
> >    __ftrace_set_clr_event+0x44/0x88
> >    trace_array_set_clr_event+0x24/0x38
> >    mytimer_handler+0x34/0x40 [sample_trace_array]
> >
> > mutex_lock() will be called in interrupt context, using workqueue to fix it.
> Fixes:
Missing itï will send v3ï thanks.
> > Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
> Reviewed-by: Divya Indi <divya.indi@xxxxxxxxxx>