[syzbot] possible deadlock in team_del_slave (2)

From: syzbot
Date: Mon Jan 30 2023 - 00:11:48 EST

Next message: Matthew Wilcox: "Re: [RFC v3 2/4] mm: move PG_slab flag to page_type"
Previous message: Michael Ellerman: "Re: [PATCH v2 4/4] mm, arch: add generic implementation of pfn_valid() for FLATMEM"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot found the following issue on:

HEAD commit: 83abd4d4c4be Merge tag 'platform-drivers-x86-v6.2-3' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1169c315480000
kernel config: https://syzkaller.appspot.com/x/.config?x=1adb0905dddc79ba
dashboard link: https://syzkaller.appspot.com/bug?extid=1c71587a1a09de7fbde3
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/27a2378a1d32/disk-83abd4d4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/311b7677d1f2/vmlinux-83abd4d4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eac6c271be29/bzImage-83abd4d4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1c71587a1a09de7fbde3@xxxxxxxxxxxxxxxxxxxxxxxxx

======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc5-syzkaller-00108-g83abd4d4c4be #0 Not tainted
------------------------------------------------------
syz-executor.5/19937 is trying to acquire lock:
ffff88801ed2ecf8 (team->team_lock_key#2){+.+.}-{3:3}, at: team_del_slave+0x31/0x1c0 drivers/net/team/team.c:1998

but task is already holding lock:
ffff888036730728 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0xfb/0x190 net/wireless/nl80211.c:4328

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (&rdev->wiphy.mtx){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
wiphy_lock include/net/cfg80211.h:5633 [inline]
ieee80211_open net/mac80211/iface.c:437 [inline]
ieee80211_open+0x193/0x250 net/mac80211/iface.c:424
__dev_open+0x297/0x4d0 net/core/dev.c:1417
dev_open net/core/dev.c:1453 [inline]
dev_open+0xec/0x150 net/core/dev.c:1446
team_port_add drivers/net/team/team.c:1215 [inline]
team_add_slave+0xa03/0x1c70 drivers/net/team/team.c:1984
do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2617
do_setlink+0x89b/0x3bb0 net/core/rtnetlink.c:2820
__rtnl_newlink+0xd69/0x1840 net/core/rtnetlink.c:3590
rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637
rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574
netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1942
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
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 (team->team_lock_key#2){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
team_del_slave+0x31/0x1c0 drivers/net/team/team.c:1998
team_device_event+0xd7/0xad0 drivers/net/team/team.c:3022
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
call_netdevice_notifiers net/core/dev.c:1996 [inline]
unregister_netdevice_many_notify+0xa2b/0x19e0 net/core/dev.c:10839
unregister_netdevice_many net/core/dev.c:10895 [inline]
unregister_netdevice_queue+0x2e5/0x3c0 net/core/dev.c:10776
unregister_netdevice include/linux/netdevice.h:3059 [inline]
_cfg80211_unregister_wdev+0x64a/0x830 net/wireless/core.c:1157
ieee80211_if_remove+0x1e3/0x390 net/mac80211/iface.c:2228
ieee80211_del_iface+0x16/0x20 net/mac80211/cfg.c:202
rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline]
cfg80211_remove_virtual_intf+0x10a/0x3b0 net/wireless/util.c:2497
nl80211_del_interface+0x106/0x190 net/wireless/nl80211.c:4330
genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968
genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076
netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1942
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
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:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&rdev->wiphy.mtx);
lock(team->team_lock_key#2);
lock(&rdev->wiphy.mtx);
lock(team->team_lock_key#2);

*** DEADLOCK ***

3 locks held by syz-executor.5/19937:
#0: ffffffff8e14f8d0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1075
#1: ffffffff8e0b4328 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0xb4/0xab0 net/wireless/nl80211.c:16161
#2: ffff888036730728 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0xfb/0x190 net/wireless/nl80211.c:4328

stack backtrace:
CPU: 0 PID: 19937 Comm: syz-executor.5 Not tainted 6.2.0-rc5-syzkaller-00108-g83abd4d4c4be #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
team_del_slave+0x31/0x1c0 drivers/net/team/team.c:1998
team_device_event+0xd7/0xad0 drivers/net/team/team.c:3022
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
call_netdevice_notifiers net/core/dev.c:1996 [inline]
unregister_netdevice_many_notify+0xa2b/0x19e0 net/core/dev.c:10839
unregister_netdevice_many net/core/dev.c:10895 [inline]
unregister_netdevice_queue+0x2e5/0x3c0 net/core/dev.c:10776
unregister_netdevice include/linux/netdevice.h:3059 [inline]
_cfg80211_unregister_wdev+0x64a/0x830 net/wireless/core.c:1157
ieee80211_if_remove+0x1e3/0x390 net/mac80211/iface.c:2228
ieee80211_del_iface+0x16/0x20 net/mac80211/cfg.c:202
rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline]
cfg80211_remove_virtual_intf+0x10a/0x3b0 net/wireless/util.c:2497
nl80211_del_interface+0x106/0x190 net/wireless/nl80211.c:4330
genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968
genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076
netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1942
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
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: 0033:0x7fbab9c8c0c9
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:00007fbaba92a168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbab9dabf80 RCX: 00007fbab9c8c0c9
RDX: 0000000000000000 RSI: 0000000020001000 RDI: 0000000000000004
RBP: 00007fbab9ce7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff9cf40df R14: 00007fbaba92a300 R15: 0000000000022000
</TASK>
team0: Port device wlan0 removed

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Next message: Matthew Wilcox: "Re: [RFC v3 2/4] mm: move PG_slab flag to page_type"
Previous message: Michael Ellerman: "Re: [PATCH v2 4/4] mm, arch: add generic implementation of pfn_valid() for FLATMEM"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]