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05 April 2024, 19:05:47 UTC
Revision e04a28d45ff343b47a4ffc4dee3a3e279e76ddfa authored by Will Deacon on 10 February 2016, 16:05:28 UTC, committed by Will Deacon on 10 February 2016, 16:05:28 UTC 
arm64: debug: re-enable irqs before sending breakpoint SIGTRAP
 
force_sig_info can sleep under an -rt kernel, so attempting to send a
breakpoint SIGTRAP with interrupts disabled yields the following BUG:

  BUG: sleeping function called from invalid context at
  /kernel-source/kernel/locking/rtmutex.c:917
  in_atomic(): 0, irqs_disabled(): 128, pid: 551, name: test.sh
  CPU: 5 PID: 551 Comm: test.sh Not tainted 4.1.13-rt13 #7
  Hardware name: Freescale Layerscape 2085a RDB Board (DT)
  Call trace:
	 dump_backtrace+0x0/0x128
	 show_stack+0x24/0x30
	 dump_stack+0x80/0xa0
	 ___might_sleep+0x128/0x1a0
	 rt_spin_lock+0x2c/0x40
	 force_sig_info+0xcc/0x210
	 brk_handler.part.2+0x6c/0x80
	 brk_handler+0xd8/0xe8
	 do_debug_exception+0x58/0xb8

This patch fixes the problem by ensuring that interrupts are enabled
prior to sending the SIGTRAP if they were already enabled in the user
context.

Reported-by: Yang Shi <yang.shi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
1 parent bcaf669
History
Tip revision: e04a28d45ff343b47a4ffc4dee3a3e279e76ddfa authored by Will Deacon on 10 February 2016, 16:05:28 UTC
arm64: debug: re-enable irqs before sending breakpoint SIGTRAP
Tip revision: e04a28d
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