linux-kernel - percpu allocation failures

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Message-ID: <87efqttqr6.fsf@hermes>
Date:   Tue, 26 Sep 2017 16:37:49 +0100
From:   Luis Henriques <lhenriques@...e.com>
To:     Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Dennis Zhou <dennisszhou@...il.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: percpu allocation failures

Hi,

Probably already reported, but I couldn't find anything so here it
goes:

starting with 4.14-rc1 I see the following during boot:

[   25.199053] percpu: allocation failed, size=16 align=16 atomic=0, alloc from reserved chunk failed
[   25.200195] CPU: 5 PID: 723 Comm: modprobe Tainted: G            E   4.14.0-rc2 #103
[   25.201290] Hardware name: Dell Inc. Precision 5510/0N8J4R, BIOS 1.2.25 05/07/2017
[   25.202430] Call Trace:
[   25.203509]  dump_stack+0x63/0x89
[   25.204364]  pcpu_alloc+0x5cd/0x5f0
[   25.205302]  __alloc_reserved_percpu+0x18/0x20
[   25.206355]  load_module+0x733/0x2c00
[   25.207444]  ? kernel_read_file+0x1a3/0x1d0
[   25.208596]  SYSC_finit_module+0xfc/0x120
[   25.209634]  ? SYSC_finit_module+0xfc/0x120
[   25.210733]  SyS_finit_module+0xe/0x10
[   25.211747]  entry_SYSCALL_64_fastpath+0x1e/0xa9
[   25.212763] RIP: 0033:0x7f70d9e86219
[   25.213508] RSP: 002b:00007ffcd3ff8f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   25.214391] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f70d9e86219
[   25.215107] RDX: 0000000000000000 RSI: 00005642ddf158cc RDI: 0000000000000000
[   25.215949] RBP: 00007ffcd3ff7f30 R08: 0000000000000000 R09: 0000000000000001
[   25.216592] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
[   25.217194] R13: 00005642de3d65f0 R14: 00007ffcd3ff7f10 R15: 0000000000000005
[   25.217812] nft_meta: Could not allocate 16 bytes percpu data

A few more failures follow.

A bisect ended up with the merge commit a7cbfd05f427 ("Merge branch
'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu").

Cheers,
-- 
Luis