linux-kernel - Re: [PATCH v11 0/6] Use pageblock_order for cma and alloc_contig

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Date:   Thu, 28 Apr 2022 12:19:11 -0400
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Zi Yan <ziy@...dia.com>
CC:     David Hildenbrand <david@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Eric Ren <renzhengeek@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Oscar Salvador" <osalvador@...e.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v11 0/6] Use pageblock_order for cma and
 alloc_contig_range alignment.

On Thu, Apr 28, 2022 at 08:39:06AM -0400, Zi Yan wrote:
> How about the one attached? I can apply it to next-20220428. Let me know
> if you are using a different branch. Thanks.

The original endless loop is gone, but running some syscall fuzzer
afterwards for a while would trigger the warning here. I have yet to
figure out if this is related to this series.

        /*
         * There are several places where we assume that the order value is sane
         * so bail out early if the request is out of bound.
         */
        if (unlikely(order >= MAX_ORDER)) {
                WARN_ON_ONCE(!(gfp & __GFP_NOWARN));
                return NULL;
        }

 WARNING: CPU: 26 PID: 172874 at mm/page_alloc.c:5368 __alloc_pages
 CPU: 26 PID: 172874 Comm: trinity-main Not tainted 5.18.0-rc4-next-20220428-dirty #67
 pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 tpidr_el2 : ffff28cf80a61000
 pc : __alloc_pages
 lr : alloc_pages
 sp : ffff8000597b70f0
 x29: ffff8000597b70f0 x28: ffff0801e68d34c0 x27: 0000000000000000
 x26: 1ffff0000b2f6ea2 x25: ffff8000597b7510 x24: 0000000000000dc0
 x23: ffff28cf80a61000 x22: 000000000000000e x21: 1ffff0000b2f6e28
 x20: 0000000000040dc0 x19: ffffdf670d4a6fe0 x18: ffffdf66fa017d1c
 x17: ffffdf66f42f8348 x16: 1fffe1003cd1a7b3 x15: 000000000000001a
 x14: 1fffe1003cd1a7a6 x13: 0000000000000004 x12: ffff70000b2f6e05
 x11: 1ffff0000b2f6e04 x10: 00000000f204f1f1 x9 : 000000000000f204
 x8 : dfff800000000000 x7 : 00000000f3000000 x6 : 00000000f3f3f3f3
 x5 : ffff70000b2f6e28 x4 : ffff0801e68d34c0 x3 : 0000000000000000
 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000040dc0
 Call trace:
  __alloc_pages
  alloc_pages
  kmalloc_order
  kmalloc_order_trace
  __kmalloc
  __regset_get
  regset_get_alloc
  fill_thread_core_info
  fill_note_info
  elf_core_dump
  do_coredump
  get_signal
  do_signal
  do_notify_resume
  el0_svc
  el0t_64_sync_handler
  el0t_64_sync
 irq event stamp: 3614
 hardirqs last  enabled at (3613):  _raw_spin_unlock_irqrestore
 hardirqs last disabled at (3614):  el1_dbg
 softirqs last  enabled at (2988):  fpsimd_preserve_current_state
 softirqs last disabled at (2986):  fpsimd_preserve_current_state