http://bugs.dpdk.org/show_bug.cgi?id=1944
Bug ID: 1944
Summary: Crash due to corruption from data race in page
prefault in alloc_seg()
Product: DPDK
Version: 24.11
Hardware: All
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Hi, recently we caught a data corruption seemingly caused by a page prefault in
`alloc_seg()` function from `lib/eal/linux/eal_memalloc.c`:
> *(volatile int *)addr = *(volatile int *)addr;
Internal investigation showed that `rte_eal_init()` from a secondary process
was indirectly calling this function, which in rare cases led to data
corruption.
In our case it resulted in a scheduler crash:
> EAL: PANIC in eth_event_queue_callback():
> Cannot restart RxQ(p:1,q:0) after max trying times 4, abort!
The issue is reported for v24.11, but I don't think it is tied to this specific
version and is a general problem since that prefault was added in v18.05.
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