From: Yang Shi Date: Thu, 10 Dec 2015 10:58:51 -0800 Subject: [PATCH 065/342] x86/signal: delay calling signals on 32bit Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=634425200c2407f794e54dfa9f59786e87b81860 When running some ptrace single step tests on x86-32 machine, the below problem is triggered: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917 in_atomic(): 1, irqs_disabled(): 0, pid: 1041, name: dummy2 Preemption disabled at:[] do_debug+0x1f/0x1a0 CPU: 10 PID: 1041 Comm: dummy2 Tainted: G W 4.1.13-rt13 #1 Call Trace: [] dump_stack+0x46/0x5c [] ___might_sleep+0x137/0x220 [] rt_spin_lock+0x1f/0x80 [] do_force_sig_info+0x2a/0xc0 [] force_sig_info+0xd/0x10 [] send_sigtrap+0x6f/0x80 [] do_debug+0x161/0x1a0 [] debug_stack_correct+0x2e/0x35 This happens since 959274753857 ("x86, traps: Track entry into and exit from IST context") which was merged in v4.1-rc1. Signed-off-by: Yang Shi Signed-off-by: Sebastian Andrzej Siewior --- arch/x86/include/asm/signal.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/signal.h b/arch/x86/include/asm/signal.h index fb0438d06ca7..c00e27af2205 100644 --- a/arch/x86/include/asm/signal.h +++ b/arch/x86/include/asm/signal.h @@ -37,7 +37,7 @@ typedef struct { * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the * trap. */ -#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_X86_64) +#if defined(CONFIG_PREEMPT_RT_FULL) #define ARCH_RT_DELAYS_SIGNAL_SEND #endif