linux-kernel - [PATCH] irq_work: Use kasan_record_aux_stack

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Date:   Sat,  2 Apr 2022 22:25:55 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
        dvyukov@...gle.com, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] irq_work: Use kasan_record_aux_stack_noalloc() record callstack

[    4.113128] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46
[    4.113132] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 239, name: bootlogd
[    4.113149] Preemption disabled at:
[    4.113149] [<ffffffffbab1a531>] rt_mutex_slowunlock+0xa1/0x4e0
[    4.113154] CPU: 3 PID: 239 Comm: bootlogd Tainted: G        W
5.17.1-rt17-yocto-preempt-rt+ #105
[    4.113157] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009),
BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[    4.113159] Call Trace:
[    4.113160]  <TASK>
[    4.113161]  dump_stack_lvl+0x60/0x8c
[    4.113165]  dump_stack+0x10/0x12
[    4.113167]  __might_resched.cold+0x13b/0x173
[    4.113172]  rt_spin_lock+0x5b/0xf0
[    4.113179]  get_page_from_freelist+0x20c/0x1610
[    4.113208]  __alloc_pages+0x25e/0x5e0
[    4.113222]  __stack_depot_save+0x3c0/0x4a0
[    4.113228]  kasan_save_stack+0x3a/0x50
[    4.113322]  __kasan_record_aux_stack+0xb6/0xc0
[    4.113326]  kasan_record_aux_stack+0xe/0x10
[    4.113329]  irq_work_queue_on+0x6a/0x1c0
[    4.113333]  pull_rt_task+0x631/0x6b0
[    4.113343]  do_balance_callbacks+0x56/0x80
[    4.113346]  __balance_callbacks+0x63/0x90
[    4.113350]  rt_mutex_setprio+0x349/0x880
[    4.113366]  rt_mutex_slowunlock+0x22a/0x4e0
[    4.113377]  rt_spin_unlock+0x49/0x80
[    4.113380]  uart_write+0x186/0x2b0
[    4.113385]  do_output_char+0x2e9/0x3a0
[    4.113389]  n_tty_write+0x306/0x800
[    4.113413]  file_tty_write.isra.0+0x2af/0x450
[    4.113422]  tty_write+0x22/0x30
[    4.113425]  new_sync_write+0x27c/0x3a0
[    4.113446]  vfs_write+0x3f7/0x5d0
[    4.113451]  ksys_write+0xd9/0x180
[    4.113463]  __x64_sys_write+0x43/0x50
[    4.113466]  do_syscall_64+0x44/0x90
[    4.113469]  entry_SYSCALL_64_after_hwframe+0x44/0xae

On PREEMPT_RT kernel and KASAN is enabled. the kasan_record_aux_stack()
may call alloc_pages(), and the rt-spinlock will be acquired, if
currently in atomic context, will trigger warning. fix it by use
kasan_record_aux_stack_noalloc() to avoid call alloc_pages().

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/irq_work.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index f7df715ec28e..7afa40fe5cc4 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -137,7 +137,7 @@ bool irq_work_queue_on(struct irq_work *work, int cpu)
 	if (!irq_work_claim(work))
 		return false;
 
-	kasan_record_aux_stack(work);
+	kasan_record_aux_stack_noalloc(work);
 
 	preempt_disable();
 	if (cpu != smp_processor_id()) {
-- 
2.25.1