linux-kernel - [PATCH 6.8 011/715] workqueue: Don't call cpumask_test_cpu() with -1 CPU in wq_update_node_max

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Message-ID: <20240324223455.1342824-12-sashal@kernel.org>
Date: Sun, 24 Mar 2024 18:23:10 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.8 011/715] workqueue: Don't call cpumask_test_cpu() with -1 CPU in wq_update_node_max_active()

From: Tejun Heo <tj@...nel.org>

[ Upstream commit 15930da42f8981dc42c19038042947b475b19f47 ]

For wq_update_node_max_active(), @off_cpu of -1 indicates that no CPU is
going down. The function was incorrectly calling cpumask_test_cpu() with -1
CPU leading to oopses like the following on some archs:

  Unable to handle kernel paging request at virtual address ffff0002100296e0
  ..
  pc : wq_update_node_max_active+0x50/0x1fc
  lr : wq_update_node_max_active+0x1f0/0x1fc
  ...
  Call trace:
    wq_update_node_max_active+0x50/0x1fc
    apply_wqattrs_commit+0xf0/0x114
    apply_workqueue_attrs_locked+0x58/0xa0
    alloc_workqueue+0x5ac/0x774
    workqueue_init_early+0x460/0x540
    start_kernel+0x258/0x684
    __primary_switched+0xb8/0xc0
  Code: 9100a273 35000d01 53067f00 d0016dc1 (f8607a60)
  ---[ end trace 0000000000000000 ]---
  Kernel panic - not syncing: Attempted to kill the idle task!
  ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

Fix it.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
Reported-by: Nathan Chancellor <nathan@...nel.org>
Tested-by: Nathan Chancellor <nathan@...nel.org>
Link: http://lkml.kernel.org/r/91eacde0-df99-4d5c-a980-91046f66e612@samsung.com
Fixes: 5797b1c18919 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/workqueue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4f3425ed62ed9..ed8ebc9776016 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1506,7 +1506,7 @@ static void wq_update_node_max_active(struct workqueue_struct *wq, int off_cpu)
 
 	lockdep_assert_held(&wq->mutex);
 
-	if (!cpumask_test_cpu(off_cpu, effective))
+	if (off_cpu >= 0 && !cpumask_test_cpu(off_cpu, effective))
 		off_cpu = -1;
 
 	total_cpus = cpumask_weight_and(effective, cpu_online_mask);
-- 
2.43.0