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Date: Wed, 19 Apr 2023 10:52:15 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: Zqiang <qiang1.zhang@...el.com>, elver@...gle.com,
ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
dvyukov@...gle.com, akpm@...ux-foundation.org,
Vlastimil Babka <vbabka@...e.cz>
Cc: kasan-dev@...glegroups.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] kasan: Fix lockdep report invalid wait context
On 2023/3/27 20:00, Zqiang wrote:
> For kernels built with the following options and booting
>
> CONFIG_SLUB=y
> CONFIG_DEBUG_LOCKDEP=y
> CONFIG_PROVE_LOCKING=y
> CONFIG_PROVE_RAW_LOCK_NESTING=y
>
> [ 0.523115] [ BUG: Invalid wait context ]
> [ 0.523315] 6.3.0-rc1-yocto-standard+ #739 Not tainted
> [ 0.523649] -----------------------------
> [ 0.523663] swapper/0/0 is trying to lock:
> [ 0.523663] ffff888035611360 (&c->lock){....}-{3:3}, at: put_cpu_partial+0x2e/0x1e0
> [ 0.523663] other info that might help us debug this:
> [ 0.523663] context-{2:2}
> [ 0.523663] no locks held by swapper/0/0.
> [ 0.523663] stack backtrace:
> [ 0.523663] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.3.0-rc1-yocto-standard+ #739
> [ 0.523663] Call Trace:
> [ 0.523663] <IRQ>
> [ 0.523663] dump_stack_lvl+0x64/0xb0
> [ 0.523663] dump_stack+0x10/0x20
> [ 0.523663] __lock_acquire+0x6c4/0x3c10
> [ 0.523663] lock_acquire+0x188/0x460
> [ 0.523663] put_cpu_partial+0x5a/0x1e0
> [ 0.523663] __slab_free+0x39a/0x520
> [ 0.523663] ___cache_free+0xa9/0xc0
> [ 0.523663] qlist_free_all+0x7a/0x160
> [ 0.523663] per_cpu_remove_cache+0x5c/0x70
> [ 0.523663] __flush_smp_call_function_queue+0xfc/0x330
> [ 0.523663] generic_smp_call_function_single_interrupt+0x13/0x20
> [ 0.523663] __sysvec_call_function+0x86/0x2e0
> [ 0.523663] sysvec_call_function+0x73/0x90
> [ 0.523663] </IRQ>
> [ 0.523663] <TASK>
> [ 0.523663] asm_sysvec_call_function+0x1b/0x20
> [ 0.523663] RIP: 0010:default_idle+0x13/0x20
> [ 0.523663] RSP: 0000:ffffffff83e07dc0 EFLAGS: 00000246
> [ 0.523663] RAX: 0000000000000000 RBX: ffffffff83e1e200 RCX: ffffffff82a83293
> [ 0.523663] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8119a6b1
> [ 0.523663] RBP: ffffffff83e07dc8 R08: 0000000000000001 R09: ffffed1006ac0d66
> [ 0.523663] R10: ffff888035606b2b R11: ffffed1006ac0d65 R12: 0000000000000000
> [ 0.523663] R13: ffffffff83e1e200 R14: ffffffff84a7d980 R15: 0000000000000000
> [ 0.523663] default_idle_call+0x6c/0xa0
> [ 0.523663] do_idle+0x2e1/0x330
> [ 0.523663] cpu_startup_entry+0x20/0x30
> [ 0.523663] rest_init+0x152/0x240
> [ 0.523663] arch_call_rest_init+0x13/0x40
> [ 0.523663] start_kernel+0x331/0x470
> [ 0.523663] x86_64_start_reservations+0x18/0x40
> [ 0.523663] x86_64_start_kernel+0xbb/0x120
> [ 0.523663] secondary_startup_64_no_verify+0xe0/0xeb
> [ 0.523663] </TASK>
>
> The local_lock_irqsave() is invoked in put_cpu_partial() and happens
> in IPI context, due to the CONFIG_PROVE_RAW_LOCK_NESTING=y (the
> LD_WAIT_CONFIG not equal to LD_WAIT_SPIN), so acquire local_lock in
> IPI context will trigger above calltrace.
Just to add another similar case:
Call Trace:
<IRQ>
dump_stack_lvl+0x69/0x97
__lock_acquire+0x4a0/0x1b50
lock_acquire+0x261/0x2c0
? restore_bytes+0x40/0x40
local_lock_acquire+0x21/0x70
? restore_bytes+0x40/0x40
put_cpu_partial+0x41/0x130
? flush_smp_call_function_queue+0x125/0x4d0
kfree+0x250/0x2c0
flush_smp_call_function_queue+0x125/0x4d0
__sysvec_call_function_single+0x3a/0x100
sysvec_call_function_single+0x4b/0x90
</IRQ>
<TASK>
asm_sysvec_call_function_single+0x16/0x20
So we can't call kfree() and its friends in interrupt context?
Also +Vlastimil Babka.
Thanks,
Qi
>
> This commit therefore move qlist_free_all() from hard-irq context to
> task context.
>
> Signed-off-by: Zqiang <qiang1.zhang@...el.com>
> ---
> v1->v2:
> Modify the commit information and add Cc.
>
> mm/kasan/quarantine.c | 34 ++++++++--------------------------
> 1 file changed, 8 insertions(+), 26 deletions(-)
>
> diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
> index 75585077eb6d..152dca73f398 100644
> --- a/mm/kasan/quarantine.c
> +++ b/mm/kasan/quarantine.c
> @@ -99,7 +99,6 @@ static unsigned long quarantine_size;
> static DEFINE_RAW_SPINLOCK(quarantine_lock);
> DEFINE_STATIC_SRCU(remove_cache_srcu);
>
> -#ifdef CONFIG_PREEMPT_RT
> struct cpu_shrink_qlist {
> raw_spinlock_t lock;
> struct qlist_head qlist;
> @@ -108,7 +107,6 @@ struct cpu_shrink_qlist {
> static DEFINE_PER_CPU(struct cpu_shrink_qlist, shrink_qlist) = {
> .lock = __RAW_SPIN_LOCK_UNLOCKED(shrink_qlist.lock),
> };
> -#endif
>
> /* Maximum size of the global queue. */
> static unsigned long quarantine_max_size;
> @@ -319,16 +317,6 @@ static void qlist_move_cache(struct qlist_head *from,
> }
> }
>
> -#ifndef CONFIG_PREEMPT_RT
> -static void __per_cpu_remove_cache(struct qlist_head *q, void *arg)
> -{
> - struct kmem_cache *cache = arg;
> - struct qlist_head to_free = QLIST_INIT;
> -
> - qlist_move_cache(q, &to_free, cache);
> - qlist_free_all(&to_free, cache);
> -}
> -#else
> static void __per_cpu_remove_cache(struct qlist_head *q, void *arg)
> {
> struct kmem_cache *cache = arg;
> @@ -340,7 +328,6 @@ static void __per_cpu_remove_cache(struct qlist_head *q, void *arg)
> qlist_move_cache(q, &sq->qlist, cache);
> raw_spin_unlock_irqrestore(&sq->lock, flags);
> }
> -#endif
>
> static void per_cpu_remove_cache(void *arg)
> {
> @@ -362,6 +349,8 @@ void kasan_quarantine_remove_cache(struct kmem_cache *cache)
> {
> unsigned long flags, i;
> struct qlist_head to_free = QLIST_INIT;
> + int cpu;
> + struct cpu_shrink_qlist *sq;
>
> /*
> * Must be careful to not miss any objects that are being moved from
> @@ -372,20 +361,13 @@ void kasan_quarantine_remove_cache(struct kmem_cache *cache)
> */
> on_each_cpu(per_cpu_remove_cache, cache, 1);
>
> -#ifdef CONFIG_PREEMPT_RT
> - {
> - int cpu;
> - struct cpu_shrink_qlist *sq;
> -
> - for_each_online_cpu(cpu) {
> - sq = per_cpu_ptr(&shrink_qlist, cpu);
> - raw_spin_lock_irqsave(&sq->lock, flags);
> - qlist_move_cache(&sq->qlist, &to_free, cache);
> - raw_spin_unlock_irqrestore(&sq->lock, flags);
> - }
> - qlist_free_all(&to_free, cache);
> + for_each_online_cpu(cpu) {
> + sq = per_cpu_ptr(&shrink_qlist, cpu);
> + raw_spin_lock_irqsave(&sq->lock, flags);
> + qlist_move_cache(&sq->qlist, &to_free, cache);
> + raw_spin_unlock_irqrestore(&sq->lock, flags);
> }
> -#endif
> + qlist_free_all(&to_free, cache);
>
> raw_spin_lock_irqsave(&quarantine_lock, flags);
> for (i = 0; i < QUARANTINE_BATCHES; i++) {
--
Thanks,
Qi
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