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* [PATCH] can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock
  2023-07-10 17:53 ` syzbot
@ 2023-07-12  0:47 Ziqi Zhao
  2023-07-12  1:16 ` [syzbot] [can?] possible deadlock in j1939_sk_errqueue (2) syzbot
  -1 siblings, 1 reply; 6+ messages in thread
From: Ziqi Zhao @ 2023-07-12  0:47 UTC (permalink / raw)
  To: syzbot+1591462f226d9cbf0564
  Cc: astrajoan, davem, dvyukov, edumazet, ivan.orlov0322, kernel, kuba,
	linux-can, linux-kernel, linux, mkl, netdev, o.rempel, pabeni,
	robin, skhan, socketcan, syzkaller-bugs, syzkaller

The following 3 locks would race against each other, causing the
deadlock situation in the Syzbot bug report:

- j1939_socks_lock
- active_session_list_lock
- sk_session_queue_lock

A reasonable fix is to change j1939_socks_lock to an rwlock, since in
the rare situations where a write lock is required for the linked list
that j1939_socks_lock is protecting, the code does not attempt to
acquire any more locks. This would break the circular lock dependency,
where, for example, the current thread already locks j1939_socks_lock
and attempts to acquire sk_session_queue_lock, and at the same time,
another thread attempts to acquire j1939_socks_lock while holding
sk_session_queue_lock.

NOTE: This patch along does not fix the unregister_netdevice bug
reported by Syzbot; instead, it solves a deadlock situation to prepare
for one or more further patches to actually fix the Syzbot bug, which
appears to be a reference counting problem within the j1939 codebase.

#syz test:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Signed-off-by: Ziqi Zhao <astrajoan@yahoo.com>
---
 net/can/j1939/j1939-priv.h |  2 +-
 net/can/j1939/main.c       |  2 +-
 net/can/j1939/socket.c     | 25 +++++++++++++------------
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/net/can/j1939/j1939-priv.h b/net/can/j1939/j1939-priv.h
index 16af1a7f80f6..74f15592d170 100644
--- a/net/can/j1939/j1939-priv.h
+++ b/net/can/j1939/j1939-priv.h
@@ -86,7 +86,7 @@ struct j1939_priv {
 	unsigned int tp_max_packet_size;
 
 	/* lock for j1939_socks list */
-	spinlock_t j1939_socks_lock;
+	rwlock_t j1939_socks_lock;
 	struct list_head j1939_socks;
 
 	struct kref rx_kref;
diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index ecff1c947d68..a6fb89fa6278 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -274,7 +274,7 @@ struct j1939_priv *j1939_netdev_start(struct net_device *ndev)
 		return ERR_PTR(-ENOMEM);
 
 	j1939_tp_init(priv);
-	spin_lock_init(&priv->j1939_socks_lock);
+	rwlock_init(&priv->j1939_socks_lock);
 	INIT_LIST_HEAD(&priv->j1939_socks);
 
 	mutex_lock(&j1939_netdev_lock);
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index feaec4ad6d16..a8b981dc2065 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -80,16 +80,16 @@ static void j1939_jsk_add(struct j1939_priv *priv, struct j1939_sock *jsk)
 	jsk->state |= J1939_SOCK_BOUND;
 	j1939_priv_get(priv);
 
-	spin_lock_bh(&priv->j1939_socks_lock);
+	write_lock_bh(&priv->j1939_socks_lock);
 	list_add_tail(&jsk->list, &priv->j1939_socks);
-	spin_unlock_bh(&priv->j1939_socks_lock);
+	write_unlock_bh(&priv->j1939_socks_lock);
 }
 
 static void j1939_jsk_del(struct j1939_priv *priv, struct j1939_sock *jsk)
 {
-	spin_lock_bh(&priv->j1939_socks_lock);
+	write_lock_bh(&priv->j1939_socks_lock);
 	list_del_init(&jsk->list);
-	spin_unlock_bh(&priv->j1939_socks_lock);
+	write_unlock_bh(&priv->j1939_socks_lock);
 
 	j1939_priv_put(priv);
 	jsk->state &= ~J1939_SOCK_BOUND;
@@ -329,13 +329,13 @@ bool j1939_sk_recv_match(struct j1939_priv *priv, struct j1939_sk_buff_cb *skcb)
 	struct j1939_sock *jsk;
 	bool match = false;
 
-	spin_lock_bh(&priv->j1939_socks_lock);
+	read_lock_bh(&priv->j1939_socks_lock);
 	list_for_each_entry(jsk, &priv->j1939_socks, list) {
 		match = j1939_sk_recv_match_one(jsk, skcb);
 		if (match)
 			break;
 	}
-	spin_unlock_bh(&priv->j1939_socks_lock);
+	read_unlock_bh(&priv->j1939_socks_lock);
 
 	return match;
 }
@@ -344,11 +344,11 @@ void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb)
 {
 	struct j1939_sock *jsk;
 
-	spin_lock_bh(&priv->j1939_socks_lock);
+	read_lock_bh(&priv->j1939_socks_lock);
 	list_for_each_entry(jsk, &priv->j1939_socks, list) {
 		j1939_sk_recv_one(jsk, skb);
 	}
-	spin_unlock_bh(&priv->j1939_socks_lock);
+	read_unlock_bh(&priv->j1939_socks_lock);
 }
 
 static void j1939_sk_sock_destruct(struct sock *sk)
@@ -484,6 +484,7 @@ static int j1939_sk_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 
 		priv = j1939_netdev_start(ndev);
 		dev_put(ndev);
+
 		if (IS_ERR(priv)) {
 			ret = PTR_ERR(priv);
 			goto out_release_sock;
@@ -1078,12 +1079,12 @@ void j1939_sk_errqueue(struct j1939_session *session,
 	}
 
 	/* spread RX notifications to all sockets subscribed to this session */
-	spin_lock_bh(&priv->j1939_socks_lock);
+	read_lock_bh(&priv->j1939_socks_lock);
 	list_for_each_entry(jsk, &priv->j1939_socks, list) {
 		if (j1939_sk_recv_match_one(jsk, &session->skcb))
 			__j1939_sk_errqueue(session, &jsk->sk, type);
 	}
-	spin_unlock_bh(&priv->j1939_socks_lock);
+	read_unlock_bh(&priv->j1939_socks_lock);
 };
 
 void j1939_sk_send_loop_abort(struct sock *sk, int err)
@@ -1271,7 +1272,7 @@ void j1939_sk_netdev_event_netdown(struct j1939_priv *priv)
 	struct j1939_sock *jsk;
 	int error_code = ENETDOWN;
 
-	spin_lock_bh(&priv->j1939_socks_lock);
+	read_lock_bh(&priv->j1939_socks_lock);
 	list_for_each_entry(jsk, &priv->j1939_socks, list) {
 		jsk->sk.sk_err = error_code;
 		if (!sock_flag(&jsk->sk, SOCK_DEAD))
@@ -1279,7 +1280,7 @@ void j1939_sk_netdev_event_netdown(struct j1939_priv *priv)
 
 		j1939_sk_queue_drop_all(priv, jsk, error_code);
 	}
-	spin_unlock_bh(&priv->j1939_socks_lock);
+	read_unlock_bh(&priv->j1939_socks_lock);
 }
 
 static int j1939_sk_no_ioctlcmd(struct socket *sock, unsigned int cmd,
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [syzbot] [can?] possible deadlock in j1939_sk_errqueue (2)
@ 2023-07-04  6:19 syzbot
  2023-07-10 17:53 ` syzbot
  2023-11-15  3:54 ` syzbot
  0 siblings, 2 replies; 6+ messages in thread
From: syzbot @ 2023-07-04  6:19 UTC (permalink / raw)
  To: davem, edumazet, kernel, kuba, linux-can, linux-kernel, linux,
	mkl, netdev, pabeni, robin, socketcan, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    ae230642190a Merge branch 'af_unix-followup-fixes-for-so_p..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1771bf67280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c9bf1936936ca698
dashboard link: https://syzkaller.appspot.com/bug?extid=1591462f226d9cbf0564
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8c060db03f09/disk-ae230642.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1b9b937ece91/vmlinux-ae230642.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0c7eb1c82bf0/bzImage-ae230642.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1591462f226d9cbf0564@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc7-syzkaller-01948-gae230642190a #0 Not tainted
------------------------------------------------------
syz-executor.2/11224 is trying to acquire lock:
ffff88803bee50d0 (&priv->j1939_socks_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:355 [inline]
ffff88803bee50d0 (&priv->j1939_socks_lock){+.-.}-{2:2}, at: j1939_sk_errqueue+0xa3/0x1a0 net/can/j1939/socket.c:1081

but task is already holding lock:
ffff88803bee5088 (&priv->active_session_list_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:355 [inline]
ffff88803bee5088 (&priv->active_session_list_lock){+.-.}-{2:2}, at: j1939_session_list_lock net/can/j1939/transport.c:238 [inline]
ffff88803bee5088 (&priv->active_session_list_lock){+.-.}-{2:2}, at: j1939_cancel_active_session+0x41/0x360 net/can/j1939/transport.c:2183

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&priv->active_session_list_lock){+.-.}-{2:2}:
       __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
       _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
       spin_lock_bh include/linux/spinlock.h:355 [inline]
       j1939_session_list_lock net/can/j1939/transport.c:238 [inline]
       j1939_session_activate+0x47/0x4b0 net/can/j1939/transport.c:1564
       j1939_sk_queue_activate_next_locked net/can/j1939/socket.c:181 [inline]
       j1939_sk_queue_activate_next+0x2bf/0x4d0 net/can/j1939/socket.c:208
       j1939_session_deactivate_activate_next net/can/j1939/transport.c:1108 [inline]
       j1939_xtp_rx_abort_one+0x3c0/0x5b0 net/can/j1939/transport.c:1351
       j1939_xtp_rx_abort net/can/j1939/transport.c:1362 [inline]
       j1939_tp_cmd_recv net/can/j1939/transport.c:2111 [inline]
       j1939_tp_recv+0xd98/0xf50 net/can/j1939/transport.c:2144
       j1939_can_recv net/can/j1939/main.c:112 [inline]
       j1939_can_recv+0x78e/0xa80 net/can/j1939/main.c:38
       deliver net/can/af_can.c:572 [inline]
       can_rcv_filter+0x5d4/0x8d0 net/can/af_can.c:606
       can_receive+0x31d/0x5c0 net/can/af_can.c:663
       can_rcv+0x1e1/0x280 net/can/af_can.c:687
       __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5452
       __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5566
       process_backlog+0x101/0x670 net/core/dev.c:5894
       __napi_poll+0xb7/0x6f0 net/core/dev.c:6460
       napi_poll net/core/dev.c:6527 [inline]
       net_rx_action+0x8a9/0xcb0 net/core/dev.c:6660
       __do_softirq+0x1d4/0x905 kernel/softirq.c:571
       run_ksoftirqd kernel/softirq.c:939 [inline]
       run_ksoftirqd+0x31/0x60 kernel/softirq.c:931
       smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
       kthread+0x344/0x440 kernel/kthread.c:379
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

-> #1 (&jsk->sk_session_queue_lock){+.-.}-{2:2}:
       __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
       _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
       spin_lock_bh include/linux/spinlock.h:355 [inline]
       j1939_sk_queue_drop_all+0x3b/0x2f0 net/can/j1939/socket.c:139
       j1939_sk_netdev_event_netdown+0x7f/0x160 net/can/j1939/socket.c:1280
       j1939_netdev_notify+0x19f/0x1d0 net/can/j1939/main.c:381
       notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93
       call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1962
       call_netdevice_notifiers_extack net/core/dev.c:2000 [inline]
       call_netdevice_notifiers net/core/dev.c:2014 [inline]
       __dev_notify_flags+0x1ea/0x2d0 net/core/dev.c:8571
       dev_change_flags+0x11b/0x170 net/core/dev.c:8607
       do_setlink+0x19e2/0x3ae0 net/core/rtnetlink.c:2867
       __rtnl_newlink+0xd85/0x1860 net/core/rtnetlink.c:3655
       rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3702
       rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6424
       netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2549
       netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
       netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
       netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1914
       sock_sendmsg_nosec net/socket.c:724 [inline]
       sock_sendmsg+0xde/0x190 net/socket.c:747
       ____sys_sendmsg+0x733/0x920 net/socket.c:2493
       ___sys_sendmsg+0x110/0x1b0 net/socket.c:2547
       __sys_sendmsg+0xf7/0x1c0 net/socket.c:2576
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&priv->j1939_socks_lock){+.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3113 [inline]
       check_prevs_add kernel/locking/lockdep.c:3232 [inline]
       validate_chain kernel/locking/lockdep.c:3847 [inline]
       __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088
       lock_acquire kernel/locking/lockdep.c:5705 [inline]
       lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
       __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
       _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
       spin_lock_bh include/linux/spinlock.h:355 [inline]
       j1939_sk_errqueue+0xa3/0x1a0 net/can/j1939/socket.c:1081
       j1939_session_destroy+0x26c/0x4e0 net/can/j1939/transport.c:271
       __j1939_session_release net/can/j1939/transport.c:294 [inline]
       kref_put include/linux/kref.h:65 [inline]
       j1939_session_put net/can/j1939/transport.c:299 [inline]
       j1939_session_deactivate_locked net/can/j1939/transport.c:1086 [inline]
       j1939_session_deactivate_locked+0x293/0x340 net/can/j1939/transport.c:1074
       j1939_cancel_active_session+0x183/0x360 net/can/j1939/transport.c:2194
       j1939_netdev_notify+0x197/0x1d0 net/can/j1939/main.c:380
       notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93
       call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1962
       call_netdevice_notifiers_extack net/core/dev.c:2000 [inline]
       call_netdevice_notifiers net/core/dev.c:2014 [inline]
       __dev_notify_flags+0x1ea/0x2d0 net/core/dev.c:8571
       dev_change_flags+0x11b/0x170 net/core/dev.c:8607
       do_setlink+0x19e2/0x3ae0 net/core/rtnetlink.c:2867
       __rtnl_newlink+0xd85/0x1860 net/core/rtnetlink.c:3655
       rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3702
       rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6424
       netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2549
       netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
       netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
       netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1914
       sock_sendmsg_nosec net/socket.c:724 [inline]
       sock_sendmsg+0xde/0x190 net/socket.c:747
       ____sys_sendmsg+0x733/0x920 net/socket.c:2493
       ___sys_sendmsg+0x110/0x1b0 net/socket.c:2547
       __sys_sendmsg+0xf7/0x1c0 net/socket.c:2576
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

Chain exists of:
  &priv->j1939_socks_lock --> &jsk->sk_session_queue_lock --> &priv->active_session_list_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&priv->active_session_list_lock);
                               lock(&jsk->sk_session_queue_lock);
                               lock(&priv->active_session_list_lock);
  lock(&priv->j1939_socks_lock);

 *** DEADLOCK ***

2 locks held by syz-executor.2/11224:
 #0: ffffffff8e1194a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
 #0: ffffffff8e1194a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3e8/0xd50 net/core/rtnetlink.c:6421
 #1: ffff88803bee5088 (&priv->active_session_list_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:355 [inline]
 #1: ffff88803bee5088 (&priv->active_session_list_lock){+.-.}-{2:2}, at: j1939_session_list_lock net/can/j1939/transport.c:238 [inline]
 #1: ffff88803bee5088 (&priv->active_session_list_lock){+.-.}-{2:2}, at: j1939_cancel_active_session+0x41/0x360 net/can/j1939/transport.c:2183

stack backtrace:
CPU: 1 PID: 11224 Comm: syz-executor.2 Not tainted 6.4.0-rc7-syzkaller-01948-gae230642190a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188
 check_prev_add kernel/locking/lockdep.c:3113 [inline]
 check_prevs_add kernel/locking/lockdep.c:3232 [inline]
 validate_chain kernel/locking/lockdep.c:3847 [inline]
 __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088
 lock_acquire kernel/locking/lockdep.c:5705 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:355 [inline]
 j1939_sk_errqueue+0xa3/0x1a0 net/can/j1939/socket.c:1081
 j1939_session_destroy+0x26c/0x4e0 net/can/j1939/transport.c:271
 __j1939_session_release net/can/j1939/transport.c:294 [inline]
 kref_put include/linux/kref.h:65 [inline]
 j1939_session_put net/can/j1939/transport.c:299 [inline]
 j1939_session_deactivate_locked net/can/j1939/transport.c:1086 [inline]
 j1939_session_deactivate_locked+0x293/0x340 net/can/j1939/transport.c:1074
 j1939_cancel_active_session+0x183/0x360 net/can/j1939/transport.c:2194
 j1939_netdev_notify+0x197/0x1d0 net/can/j1939/main.c:380
 notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1962
 call_netdevice_notifiers_extack net/core/dev.c:2000 [inline]
 call_netdevice_notifiers net/core/dev.c:2014 [inline]
 __dev_notify_flags+0x1ea/0x2d0 net/core/dev.c:8571
 dev_change_flags+0x11b/0x170 net/core/dev.c:8607
 do_setlink+0x19e2/0x3ae0 net/core/rtnetlink.c:2867
 __rtnl_newlink+0xd85/0x1860 net/core/rtnetlink.c:3655
 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3702
 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6424
 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2549
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1914
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 ____sys_sendmsg+0x733/0x920 net/socket.c:2493
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2547
 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2576
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdb2bc8c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdb2cab9168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdb2bdabf80 RCX: 00007fdb2bc8c389
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000006
RBP: 00007fdb2bcd7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd70d89bbf R14: 00007fdb2cab9300 R15: 0000000000022000
 </TASK>


---
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^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2023-11-15  3:54 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <20230711131958.334-1-hdanton@sina.com>
2023-07-11 13:20 ` [syzbot] [can?] possible deadlock in j1939_sk_errqueue (2) syzbot
2023-07-11 13:47 ` syzbot
2023-07-12  0:47 [PATCH] can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock Ziqi Zhao
2023-07-12  1:16 ` [syzbot] [can?] possible deadlock in j1939_sk_errqueue (2) syzbot
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2023-07-04  6:19 syzbot
2023-07-10 17:53 ` syzbot
2023-11-15  3:54 ` syzbot

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