netdev - Re: [PATCH mm] mm: fix BUG with kvzalloc+GFP

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Message-ID: <Yy20toVrIktiMSvH@dhcp22.suse.cz>
Date:   Fri, 23 Sep 2022 15:29:26 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Florian Westphal <fw@...len.de>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, vbabka@...e.cz,
        akpm@...ux-foundation.org, urezki@...il.com,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        Martin Zaharinov <micron10@...il.com>
Subject: Re: [PATCH mm] mm: fix BUG with kvzalloc+GFP_ATOMIC

On Fri 23-09-22 12:38:58, Florian Westphal wrote:
> Martin Zaharinov reports BUG() in mm land for 5.19.10 kernel:
>  kernel BUG at mm/vmalloc.c:2437!
>  invalid opcode: 0000 [#1] SMP
>  CPU: 28 PID: 0 Comm: swapper/28 Tainted: G        W  O      5.19.9 #1
>  [..]
>  RIP: 0010:__get_vm_area_node+0x120/0x130
>   __vmalloc_node_range+0x96/0x1e0
>   kvmalloc_node+0x92/0xb0
>   bucket_table_alloc.isra.0+0x47/0x140
>   rhashtable_try_insert+0x3a4/0x440
>   rhashtable_insert_slow+0x1b/0x30
>  [..]
> 
> bucket_table_alloc uses kvzallocGPF_ATOMIC).  If kmalloc fails, this now
> falls through to vmalloc and hits code paths that assume GFP_KERNEL.
> 
> Revert the problematic change and stay with slab allocator.

Why don't you simply fix the caller?
-- 
Michal Hocko
SUSE Labs