App-level clone emulation for microblaze is broken
Bug #1066909 reported by
Bugdal
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
QEMU |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
When CLONE_THREAD is used, the new process starts with the program counter pointing to the system call instruction, rather than the instruction immediately following it. This causes an infinite cascade (linear growth, not exponential) of thread creation, which quickly crashes when the threads start running and they're all using the same stack.
I'm using qemu 1.1.2 packaged with Debian, but I'm not aware of any fixes since then that would address the problem.
I can provide a test program if needed; a short C program using syscall() directly or an even-shorter asm program can demonstrate the issue without need for debugging around pthread library routines.
Changed in qemu: | |
status: | New → Fix Committed |
Changed in qemu: | |
status: | Fix Committed → Fix Released |
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Here is a minimal test case showing the problem.