From: LiuYe <liu.yeC@h3c.com>
To: <jason.wessel@windriver.com>, <daniel.thompson@linaro.org>
Cc: <dianders@chromium.org>, <gregkh@linuxfoundation.org>,
<jirislaby@kernel.org>, <kgdb-bugreport@lists.sourceforge.net>,
<linux-kernel@vger.kernel.org>, <linux-serial@vger.kernel.org>,
<liu.yeC@h3c.com>
Subject: [PATCH] kdb: Fix the deadlock issue in KDB debugging.
Date: Wed, 28 Feb 2024 10:56:02 +0800 [thread overview]
Message-ID: <20240228025602.3087748-1-liu.yeC@h3c.com> (raw)
master cpu : After executing the go command, a deadlock occurs.
slave cpu: may be performing thread migration,
acquiring the running queue lock of master CPU.
Then it was interrupted by kdb NMI and entered the nmi_handler process.
(nmi_handle-> kgdb_nmicallback-> kgdb_cpu_enter
while(1){ touch wathcdog}.)
example:
BUG: spinlock lockup suspected on CPU#0, namex/10450
lock: 0xffff881ffe823980, .magic: dead4ead, .owner: namexx/21888, .owner_cpu: 1
ffff881741d00000 ffff881741c01000 0000000000000000 0000000000000000
ffff881740f58e78 ffff881741cffdd0 ffffffff8147a7fc ffff881740f58f20
Call Trace:
[<ffffffff81479e6d>] ? __schedule+0x16d/0xac0
[<ffffffff8147a7fc>] ? schedule+0x3c/0x90
[<ffffffff8147e71a>] ? schedule_hrtimeout_range_clock+0x10a/0x120
[<ffffffff8147d22e>] ? mutex_unlock+0xe/0x10
[<ffffffff811c839b>] ? ep_scan_ready_list+0x1db/0x1e0
[<ffffffff8147e743>] ? schedule_hrtimeout_range+0x13/0x20
[<ffffffff811c864a>] ? ep_poll+0x27a/0x3b0
[<ffffffff8108c540>] ? wake_up_q+0x70/0x70
[<ffffffff811c99a8>] ? SyS_epoll_wait+0xb8/0xd0
[<ffffffff8147f296>] ? entry_SYSCALL_64_fastpath+0x12/0x75
CPU: 0 PID: 10450 Comm: namex Tainted: G O 4.4.65 #1
Hardware name: Insyde Purley/Type2 - Board Product Name1, BIOS 05.21.51.0036 07/19/2019
0000000000000000 ffff881ffe813c10 ffffffff8124e883 ffff881741c01000
ffff881ffe823980 ffff881ffe813c38 ffffffff810a7f7f ffff881ffe823980
000000007d2b7cd0 0000000000000001 ffff881ffe813c68 ffffffff810a80e0
Call Trace:
<#DB> [<ffffffff8124e883>] dump_stack+0x85/0xc2
[<ffffffff810a7f7f>] spin_dump+0x7f/0x100
[<ffffffff810a80e0>] do_raw_spin_lock+0xa0/0x150
[<ffffffff8147eb55>] _raw_spin_lock+0x15/0x20
[<ffffffff8108c256>] try_to_wake_up+0x176/0x3d0
[<ffffffff8108c4c5>] wake_up_process+0x15/0x20
[<ffffffff8107b371>] insert_work+0x81/0xc0
[<ffffffff8107b4e5>] __queue_work+0x135/0x390
[<ffffffff8107b786>] queue_work_on+0x46/0x90
[<ffffffff81313d28>] kgdboc_post_exp_handler+0x48/0x70
[<ffffffff810ed488>] kgdb_cpu_enter+0x598/0x610
[<ffffffff810ed6e2>] kgdb_handle_exception+0xf2/0x1f0
[<ffffffff81054e21>] __kgdb_notify+0x71/0xd0
[<ffffffff81054eb5>] kgdb_notify+0x35/0x70
[<ffffffff81082e6a>] notifier_call_chain+0x4a/0x70
[<ffffffff8108304d>] notify_die+0x3d/0x50
[<ffffffff81017219>] do_int3+0x89/0x120
[<ffffffff81480fb4>] int3+0x44/0x80
Signed-off-by: LiuYe <liu.yeC@h3c.com>
---
drivers/tty/serial/kgdboc.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 7ce7bb164..945318ef1 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -22,6 +22,9 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
+#include <linux/smp.h>
+
+#include "../kernel/sched/sched.h"
#define MAX_CONFIG_LEN 40
@@ -399,7 +402,8 @@ static void kgdboc_post_exp_handler(void)
dbg_restore_graphics = 0;
con_debug_leave();
}
- kgdboc_restore_input();
+ if (!raw_spin_is_locked(&(cpu_rq(smp_processor_id())->lock)))
+ kgdboc_restore_input();
}
static struct kgdb_io kgdboc_io_ops = {
--
2.25.1
-------------------------------------------------------------------------------------------------------------------------------------
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next reply other threads:[~2024-02-28 5:11 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-28 2:56 LiuYe [this message]
2024-02-28 12:05 ` [PATCH] kdb: Fix the deadlock issue in KDB debugging Daniel Thompson
2024-03-01 3:30 ` 答复: " Liuye
2024-03-01 10:59 ` Daniel Thompson
2024-03-12 8:37 ` 答复: " Liuye
2024-03-12 9:57 ` Daniel Thompson
2024-03-12 10:04 ` 答复: " Liuye
2024-03-12 10:24 ` Daniel Thompson
2024-03-13 1:22 ` 答复: " Liuye
2024-03-13 14:17 ` Daniel Thompson
2024-03-14 7:06 ` 答复: " Liuye
2024-03-14 13:09 ` Daniel Thompson
2024-03-15 9:59 ` 答复: " Liuye
2024-03-16 2:34 ` [PATCH v1] " liu.yec
2024-03-20 16:28 ` Daniel Thompson
2024-03-21 2:26 ` [PATCH V3] " liu.yec
2024-03-21 7:38 ` Greg KH
2024-03-21 7:57 ` 答复: " Liuye
2024-03-21 11:04 ` Daniel Thompson
2024-03-21 11:50 ` [PATCH V4] " liu.yec
2024-03-22 6:54 ` Jiri Slaby
2024-03-22 7:50 ` 答复: " Liuye
2024-03-22 15:58 ` Daniel Thompson
2024-03-23 1:41 ` [PATCH V5] " liu.yec
2024-03-25 16:54 ` Daniel Thompson
2024-03-26 0:47 ` 答复: " Liuye
2024-03-26 7:40 ` [PATCH V6] " liu.yec
2024-03-26 8:22 ` Greg KH
2024-03-26 8:54 ` [PATCH V7] " liu.yec
2024-04-02 12:58 ` Daniel Thompson
2024-04-03 6:11 ` [PATCH V8] " liu.yec
2024-04-03 13:58 ` Daniel Thompson
2024-04-03 22:22 ` Andy Shevchenko
2024-04-08 1:44 ` LiuYe
2024-04-08 10:29 ` Andy Shevchenko
2024-04-09 2:03 ` [PATCH V9] " liu.yec
2024-04-10 2:06 ` [PATCH V10] " liu.yec
2024-04-10 3:59 ` Andy Shevchenko
2024-04-10 5:30 ` Greg KH
2024-04-10 5:54 ` 答复: " Liuye
2024-04-10 5:59 ` Greg KH
2024-04-10 6:10 ` 答复: " Liuye
2024-04-10 6:15 ` Greg KH
2024-04-10 6:30 ` 答复: " Liuye
2024-04-10 7:18 ` [PATCH V11] " liu.yec
2024-04-10 8:24 ` 答复: 答复: 答复: [PATCH V10] " Greg KH
2024-04-10 8:38 ` 答复: " Liuye
2024-03-02 20:44 ` [PATCH] " Greg KH
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