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Kernel: Stop swallowing thread unblocks while process is stopped

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This easily led to kernel deadlocks if the stopped thread held an
important global mutex (like the disk cache lock) while blocking.
Resolve this by ensuring stopped threads have a chance to return to the
userland boundary before actually stopping.
This commit is contained in:
Idan Horowitz 2024-02-09 21:13:41 +02:00 • committed by Andreas Kling
parent 458e990b7b
commit e38ccebfc8
4 changed files with 24 additions and 23 deletions
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4
Kernel/Syscalls/SyscallHandler.cpp
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@ -129,7 +129,7 @@ NEVER_INLINE void syscall_handler(TrapFrame* trap)
process.tracer_trap(*current_thread, regs); // this triggers SIGTRAP and stops the thread!
}
current_thread->yield_if_stopped();
current_thread->yield_if_should_be_stopped();
#if ARCH(X86_64)
// Apply a random offset in the range 0-255 to the stack pointer,
@ -178,7 +178,7 @@ NEVER_INLINE void syscall_handler(TrapFrame* trap)
process.tracer_trap(*current_thread, regs); // this triggers SIGTRAP and stops the thread!
}
current_thread->yield_if_stopped();
current_thread->yield_if_should_be_stopped();
current_thread->check_dispatch_pending_signal();