Kernel panic - not syncing: System is deadlocked on memory

[Yin Guoyu]

Hi,
When I test the Linux kernel (commit
38fec10eb60d687e30c8c6b5420d86e8149f7557), I encountered a kernel
panic issue related to memory allocation, specifically in the
alloc_pages_mpol function. The panic message indicates "System is
deadlocked on memory," and the call trace points to
__alloc_frozen_pages_noprof failing to allocate pages, leading to an
OOM condition.
The error originates in alloc_pages_mpol, which calls policy_nodemask
to determine the nodemask and nid for memory allocation. The
subsequent call to __alloc_frozen_pages_noprof fails when the system
runs out of memory, with no swap available and no killable processes.
This crash can be triggered by executing the provided C reproducer
multiple times. The reproducer performs a series of system calls
(e.g., file creation, perf_event_open, io_submit, and filesystem
mounts), which likely stress the memory management system and expose
the bug.
This can be reproduced on:
HEAD commit:
38fec10eb60d687e30c8c6b5420d86e8149f7557
console output : https://pastebin.com/raw/T4dfWHSf
kernel config : https://pastebin.com/raw/u0Efyj5P
C reproducer : https://pastebin.com/raw/3hPqjF6M