| From: Yang Shi <yang.shi@linaro.org> |
| Date: Thu, 10 Dec 2015 10:58:51 -0800 |
| Subject: x86/signal: delay calling signals on 32bit |
| |
| 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:[<c100326f>] do_debug+0x1f/0x1a0 |
| |
| CPU: 10 PID: 1041 Comm: dummy2 Tainted: G W 4.1.13-rt13 #1 |
| Call Trace: |
| [<c1aa8306>] dump_stack+0x46/0x5c |
| [<c1080517>] ___might_sleep+0x137/0x220 |
| [<c1ab0eff>] rt_spin_lock+0x1f/0x80 |
| [<c1064b5a>] do_force_sig_info+0x2a/0xc0 |
| [<c106567d>] force_sig_info+0xd/0x10 |
| [<c1010cff>] send_sigtrap+0x6f/0x80 |
| [<c10033b1>] do_debug+0x161/0x1a0 |
| [<c1ab2921>] 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 <yang.shi@linaro.org> |
| Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| --- |
| arch/x86/include/asm/signal.h | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/arch/x86/include/asm/signal.h |
| +++ b/arch/x86/include/asm/signal.h |
| @@ -36,7 +36,7 @@ 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 |
| |
