linux-kernel - Re: [PATCH v2 2/2] module: Merge same-name module load requests

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Date:   Fri, 18 Nov 2022 18:32:54 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Prarit Bhargava <prarit@...hat.com>, pmladek@...e.com,
        Petr Pavlu <petr.pavlu@...e.com>,
        linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] module: Merge same-name module load requests

On 15.11.22 20:29, Luis Chamberlain wrote:
> On Mon, Nov 14, 2022 at 04:45:05PM +0100, David Hildenbrand wrote:
>> Note that I don't think the issue I raised is due to 6e6de3dee51a.
>> I don't have the machine at hand right now. But, again, I doubt this will
>> fix it.
> 
> There are *more* modules processed after that commit. That's all. So
> testing would be appreciated.

I just tested that change on top of 6.1.0-rc5+ on that large system
and CONFIG_KASAN_INLINE=y. No change.


[  207.955184] vmap allocation for size 2490368 failed: use vmalloc=<size> to increase size
[  207.955891] vmap allocation for size 2490368 failed: use vmalloc=<size> to increase size
[  207.956253] vmap allocation for size 2490368 failed: use vmalloc=<size> to increase size
[  207.956461] systemd-udevd: vmalloc error: size 2486272, vm_struct allocation failed, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=1-7
[  207.956573] CPU: 88 PID: 4925 Comm: systemd-udevd Not tainted 6.1.0-rc5+ #4
[  207.956580] Hardware name: Lenovo ThinkSystem SR950 -[7X12ABC1WW]-/-[7X12ABC1WW]-, BIOS -[PSE130O-1.81]- 05/20/2020
[  207.956584] Call Trace:
[  207.956588]  <TASK>
[  207.956593] vmap allocation for size 2490368 failed: use vmalloc=<size> to increase size
[  207.956593]  dump_stack_lvl+0x5b/0x77
[  207.956613]  warn_alloc.cold+0x86/0x195
[  207.956632]  ? zone_watermark_ok_safe+0x2b0/0x2b0
[  207.956641]  ? slab_free_freelist_hook+0x11e/0x1d0
[  207.956672]  ? __get_vm_area_node+0x2a4/0x340
[  207.956694]  __vmalloc_node_range+0xad6/0x11b0
[  207.956699]  ? trace_contention_end+0xda/0x140
[  207.956715]  ? __mutex_lock+0x254/0x1360
[  207.956740]  ? __mutex_unlock_slowpath+0x154/0x600
[  207.956752]  ? bit_wait_io_timeout+0x170/0x170
[  207.956761]  ? vfree_atomic+0xa0/0xa0
[  207.956775]  ? load_module+0x1d8f/0x7ff0
[  207.956786]  module_alloc+0xe7/0x170
[  207.956802]  ? load_module+0x1d8f/0x7ff0
[  207.956822]  load_module+0x1d8f/0x7ff0
[  207.956876]  ? module_frob_arch_sections+0x20/0x20
[  207.956888]  ? ima_post_read_file+0x15a/0x180
[  207.956904]  ? ima_read_file+0x140/0x140
[  207.956918]  ? kernel_read+0x5c/0x140
[  207.956931]  ? security_kernel_post_read_file+0x6d/0xb0
[  207.956950]  ? kernel_read_file+0x21d/0x7d0
[  207.956971]  ? __x64_sys_fspick+0x270/0x270
[  207.956999]  ? __do_sys_finit_module+0xfc/0x180
[  207.957005]  __do_sys_finit_module+0xfc/0x180
[  207.957012]  ? __ia32_sys_init_module+0xa0/0xa0
[  207.957023]  ? __seccomp_filter+0x15e/0xc20
[  207.957066]  ? syscall_trace_enter.constprop.0+0x98/0x230
[  207.957078]  do_syscall_64+0x58/0x80
[  207.957085]  ? asm_exc_page_fault+0x22/0x30
[  207.957095]  ? lockdep_hardirqs_on+0x7d/0x100
[  207.957103]  entry_SYSCALL_64_after_hwframe+0x63/0xcd


I have access to the system for a couple more days, if there
is anything else I should test.

-- 
Thanks,

David / dhildenb