[syzbot] [wireless?] possible deadlock in ieee80211_change_mac (2)

From: syzbot
Date: Fri Oct 04 2024 - 18:18:07 EST

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Hello,

syzbot found the following issue on:

HEAD commit: f66ebf37d69c Merge git://git.kernel.org/pub/scm/linux/kern..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15362b9f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f95955e3f7b5790c
dashboard link: https://syzkaller.appspot.com/bug?extid=eb75299195741149e159
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/50ac18fa9817/disk-f66ebf37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b6a34414ad4b/vmlinux-f66ebf37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b734c77ee7f0/bzImage-f66ebf37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+eb75299195741149e159@xxxxxxxxxxxxxxxxxxxxxxxxx

======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc1-syzkaller-00131-gf66ebf37d69c #0 Not tainted
------------------------------------------------------
syz.2.718/8035 is trying to acquire lock:
ffff888055530768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:6014 [inline]
ffff888055530768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: ieee80211_change_mac+0xcc/0x11e0 net/mac80211/iface.c:309

but task is already holding lock:
ffff88807b14cd40 (team->team_lock_key#8){+.+.}-{3:3}, at: team_del_slave+0x32/0x1d0 drivers/net/team/team_core.c:1990

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (team->team_lock_key#8){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
team_port_change_check+0x51/0x1e0 drivers/net/team/team_core.c:2950
team_device_event+0x161/0x5b0 drivers/net/team/team_core.c:2976
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
call_netdevice_notifiers net/core/dev.c:2048 [inline]
dev_close_many+0x33c/0x4c0 net/core/dev.c:1589
unregister_netdevice_many_notify+0x530/0x1da0 net/core/dev.c:11377
macvlan_device_event+0x7e0/0x870 drivers/net/macvlan.c:1830
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
call_netdevice_notifiers net/core/dev.c:2048 [inline]
unregister_netdevice_many_notify+0xedd/0x1da0 net/core/dev.c:11403
unregister_netdevice_many net/core/dev.c:11465 [inline]
unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11339
unregister_netdevice include/linux/netdevice.h:3118 [inline]
_cfg80211_unregister_wdev+0x162/0x560 net/wireless/core.c:1211
ieee80211_if_remove+0x25d/0x3a0 net/mac80211/iface.c:2240
ieee80211_del_iface+0x19/0x30 net/mac80211/cfg.c:202
rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline]
cfg80211_remove_virtual_intf+0x23f/0x410 net/wireless/util.c:2875
genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0xb14/0xec0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmsg+0x292/0x380 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&rdev->wiphy.mtx){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
wiphy_lock include/net/cfg80211.h:6014 [inline]
ieee80211_change_mac+0xcc/0x11e0 net/mac80211/iface.c:309
dev_set_mac_address+0x327/0x510 net/core/dev.c:9099
bond_set_mac_address+0x28e/0x7f0 drivers/net/bonding/bond_main.c:4880
dev_set_mac_address+0x327/0x510 net/core/dev.c:9099
__set_port_dev_addr drivers/net/team/team_core.c:57 [inline]
team_port_set_orig_dev_addr drivers/net/team/team_core.c:62 [inline]
team_port_del+0xb08/0xcc0 drivers/net/team/team_core.c:1367
team_del_slave+0x3d/0x1d0 drivers/net/team/team_core.c:1991
do_set_master net/core/rtnetlink.c:2687 [inline]
do_setlink+0xeff/0x41f0 net/core/rtnetlink.c:2907
rtnl_group_changelink net/core/rtnetlink.c:3447 [inline]
__rtnl_newlink net/core/rtnetlink.c:3706 [inline]
rtnl_newlink+0x1119/0x20a0 net/core/rtnetlink.c:3743
rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6646
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmsg+0x292/0x380 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(team->team_lock_key#8);
lock(&rdev->wiphy.mtx);
lock(team->team_lock_key#8);
lock(&rdev->wiphy.mtx);

*** DEADLOCK ***

2 locks held by syz.2.718/8035:
#0: ffffffff8fcd1748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fcd1748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643
#1: ffff88807b14cd40 (team->team_lock_key#8){+.+.}-{3:3}, at: team_del_slave+0x32/0x1d0 drivers/net/team/team_core.c:1990

stack backtrace:
CPU: 0 UID: 0 PID: 8035 Comm: syz.2.718 Not tainted 6.12.0-rc1-syzkaller-00131-gf66ebf37d69c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
wiphy_lock include/net/cfg80211.h:6014 [inline]
ieee80211_change_mac+0xcc/0x11e0 net/mac80211/iface.c:309
dev_set_mac_address+0x327/0x510 net/core/dev.c:9099
bond_set_mac_address+0x28e/0x7f0 drivers/net/bonding/bond_main.c:4880
dev_set_mac_address+0x327/0x510 net/core/dev.c:9099
__set_port_dev_addr drivers/net/team/team_core.c:57 [inline]
team_port_set_orig_dev_addr drivers/net/team/team_core.c:62 [inline]
team_port_del+0xb08/0xcc0 drivers/net/team/team_core.c:1367
team_del_slave+0x3d/0x1d0 drivers/net/team/team_core.c:1991
do_set_master net/core/rtnetlink.c:2687 [inline]
do_setlink+0xeff/0x41f0 net/core/rtnetlink.c:2907
rtnl_group_changelink net/core/rtnetlink.c:3447 [inline]
__rtnl_newlink net/core/rtnetlink.c:3706 [inline]
rtnl_newlink+0x1119/0x20a0 net/core/rtnetlink.c:3743
rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6646
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmsg+0x292/0x380 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f9977dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2f9a4b4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2f99936058 RCX: 00007f2f9977dff9
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000005
RBP: 00007f2f997f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2f99936058 R15: 00007ffe9593e008
</TASK>
team0: Port device bond0 removed
bond0: (slave wlan1): Releasing backup interface

---
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