From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: Baoquan He <bhe@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Marco Elver <elver@google.com>
Cc: kexec@lists.infradead.org, linux-doc@vger.kernel.org,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 4/5] sched: unset panic_on_warn before calling panic()
Date: Fri, 28 Jan 2022 19:42:24 +0800 [thread overview]
Message-ID: <1643370145-26831-5-git-send-email-yangtiezhu@loongson.cn> (raw)
In-Reply-To: <1643370145-26831-1-git-send-email-yangtiezhu@loongson.cn>
As done in the full WARN() handler, panic_on_warn needs to be cleared
before calling panic() to avoid recursive panics.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
kernel/sched/core.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 848eaa0..f5b0886 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5524,8 +5524,17 @@ static noinline void __schedule_bug(struct task_struct *prev)
pr_err("Preemption disabled at:");
print_ip_sym(KERN_ERR, preempt_disable_ip);
}
- if (panic_on_warn)
+
+ if (panic_on_warn) {
+ /*
+ * This thread may hit another WARN() in the panic path.
+ * Resetting this prevents additional WARN() from panicking the
+ * system on this thread. Other threads are blocked by the
+ * panic_mutex in panic().
+ */
+ panic_on_warn = 0;
panic("scheduling while atomic\n");
+ }
dump_stack();
add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
--
2.1.0
WARNING: multiple messages have this Message-ID (diff)
From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: kexec@lists.infradead.org
Subject: [PATCH 4/5] sched: unset panic_on_warn before calling panic()
Date: Fri, 28 Jan 2022 19:42:24 +0800 [thread overview]
Message-ID: <1643370145-26831-5-git-send-email-yangtiezhu@loongson.cn> (raw)
In-Reply-To: <1643370145-26831-1-git-send-email-yangtiezhu@loongson.cn>
As done in the full WARN() handler, panic_on_warn needs to be cleared
before calling panic() to avoid recursive panics.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
kernel/sched/core.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 848eaa0..f5b0886 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5524,8 +5524,17 @@ static noinline void __schedule_bug(struct task_struct *prev)
pr_err("Preemption disabled at:");
print_ip_sym(KERN_ERR, preempt_disable_ip);
}
- if (panic_on_warn)
+
+ if (panic_on_warn) {
+ /*
+ * This thread may hit another WARN() in the panic path.
+ * Resetting this prevents additional WARN() from panicking the
+ * system on this thread. Other threads are blocked by the
+ * panic_mutex in panic().
+ */
+ panic_on_warn = 0;
panic("scheduling while atomic\n");
+ }
dump_stack();
add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
--
2.1.0
next prev parent reply other threads:[~2022-01-28 11:43 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 11:42 [PATCH 0/5] Update doc and fix some issues about kdump Tiezhu Yang
2022-01-28 11:42 ` Tiezhu Yang
2022-01-28 11:42 ` [PATCH 1/5] docs: kdump: update description about sysfs file system support Tiezhu Yang
2022-01-28 11:42 ` Tiezhu Yang
2022-01-30 2:10 ` Baoquan He
2022-01-30 2:10 ` Baoquan He
2022-01-28 11:42 ` [PATCH 2/5] docs: kdump: add scp sample to write out the dump file Tiezhu Yang
2022-01-28 11:42 ` Tiezhu Yang
2022-01-30 2:46 ` Baoquan He
2022-01-30 2:46 ` Baoquan He
2022-01-28 11:42 ` [PATCH 3/5] kcsan: unset panic_on_warn before calling panic() Tiezhu Yang
2022-01-28 11:42 ` Tiezhu Yang
2022-01-28 11:42 ` Tiezhu Yang [this message]
2022-01-28 11:42 ` [PATCH 4/5] sched: " Tiezhu Yang
2022-01-28 11:52 ` Marco Elver
2022-01-28 11:52 ` Marco Elver
2022-01-30 0:29 ` Tiezhu Yang
2022-01-30 0:29 ` Tiezhu Yang
2022-01-28 11:42 ` [PATCH 5/5] kfence: " Tiezhu Yang
2022-01-28 11:42 ` Tiezhu Yang
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