From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Stefan Wiehler <stefan.wiehler@nokia.com>
Cc: "Maciej W. Rozycki" <macro@orcam.me.uk>,
Jiaxun Yang <jiaxun.yang@flygoat.com>,
linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] mips: mm: Allocate tlb_vpn array atomically
Date: Wed, 1 Apr 2026 22:27:43 +0200 [thread overview]
Message-ID: <ac1_v3KMngpw-FDB@alpha.franken.de> (raw)
In-Reply-To: <20260310104024.3554197-1-stefan.wiehler@nokia.com>
On Tue, Mar 10, 2026 at 11:40:24AM +0100, Stefan Wiehler wrote:
> Found by DEBUG_ATOMIC_SLEEP:
>
> BUG: sleeping function called from invalid context at /include/linux/sched/mm.h:306
> in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1
> preempt_count: 1, expected: 0
> RCU nest depth: 0, expected: 0
> no locks held by swapper/1/0.
> irq event stamp: 0
> hardirqs last enabled at (0): [<0000000000000000>] 0x0
> hardirqs last disabled at (0): [<ffffffff801477fc>] copy_process+0x75c/0x1b68
> softirqs last enabled at (0): [<ffffffff801477fc>] copy_process+0x75c/0x1b68
> softirqs last disabled at (0): [<0000000000000000>] 0x0
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.6.119-d79e757675ec-fct #1
> Stack : 800000000290bad8 0000000000000000 0000000000000008 800000000290bae8
> 800000000290bae8 800000000290bc78 0000000000000000 0000000000000000
> ffffffff80c80000 0000000000000001 ffffffff80d8dee8 ffffffff810d09c0
> 784bb2a7ec10647d 0000000000000010 ffffffff80a6fd60 8000000001d8a9c0
> 0000000000000000 0000000000000000 ffffffff80d90000 0000000000000000
> ffffffff80c9e0e8 0000000007ffffff 0000000000000cc0 0000000000000400
> ffffffffffffffff 0000000000000001 0000000000000002 ffffffffc0149ed8
> fffffffffffffffe 8000000002908000 800000000290bae0 ffffffff80a81b74
> ffffffff80129fb0 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000 ffffffff80129fd0 0000000000000000
> ...
> Call Trace:
> [<ffffffff80129fd0>] show_stack+0x60/0x158
> [<ffffffff80a7f894>] dump_stack_lvl+0x88/0xbc
> [<ffffffff8018d3c8>] __might_resched+0x268/0x288
> [<ffffffff803648b0>] __kmem_cache_alloc_node+0x2e0/0x330
> [<ffffffff80302788>] __kmalloc+0x58/0xd0
> [<ffffffff80a81b74>] r4k_tlb_uniquify+0x7c/0x428
> [<ffffffff80143e8c>] tlb_init+0x7c/0x110
> [<ffffffff8012bdb4>] per_cpu_trap_init+0x16c/0x1d0
> [<ffffffff80133258>] start_secondary+0x28/0x128
>
> Fixes: 231ac951faba ("MIPS: mm: kmalloc tlb_vpn array to avoid stack overflow")
> Signed-off-by: Stefan Wiehler <stefan.wiehler@nokia.com>
> Cc: stable@vger.kernel.org
> ---
> arch/mips/mm/tlb-r4k.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
applied to mips-fixes
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
prev parent reply other threads:[~2026-04-01 20:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-10 10:40 [PATCH] mips: mm: Allocate tlb_vpn array atomically Stefan Wiehler
2026-04-01 20:27 ` Thomas Bogendoerfer [this message]
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