Hello, syzbot found the following issue on: HEAD commit: b28241d8 Add linux-next specific files for 20210127 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13316b44d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=37c8f99c7210a867 dashboard link: https://syzkaller.appspot.com/bug?extid=3d2d5e6cc3fb15c6a0fd compiler: gcc (GCC) 10.1.0-syz 20200507 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3d2d5e6cc3fb15c6a0fd@xxxxxxxxxxxxxxxxxxxxxxxxx batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active device hsr_slave_0 entered promiscuous mode device hsr_slave_1 entered promiscuous mode ============================================ WARNING: possible recursive locking detected 5.11.0-rc5-next-20210127-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/8425 is trying to acquire lock: ffff8881446785e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5267 [inline] ffff8881446785e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_netdev_notifier_call+0x615/0x1180 net/wireless/core.c:1393 but task is already holding lock: ffff8881446785e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5267 [inline] ffff8881446785e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: virt_wifi_newlink+0x4cb/0x940 drivers/net/wireless/virt_wifi.c:540 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&rdev->wiphy.mtx); lock(&rdev->wiphy.mtx); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.0/8425: #0: ffffffff8cc71b08 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8cc71b08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5550 #1: ffff8881446785e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5267 [inline] #1: ffff8881446785e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: virt_wifi_newlink+0x4cb/0x940 drivers/net/wireless/virt_wifi.c:540 stack backtrace: CPU: 1 PID: 8425 Comm: syz-executor.0 Not tainted 5.11.0-rc5-next-20210127-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_deadlock_bug kernel/locking/lockdep.c:2829 [inline] check_deadlock kernel/locking/lockdep.c:2872 [inline] validate_chain kernel/locking/lockdep.c:3661 [inline] __lock_acquire.cold+0x14c/0x3b4 kernel/locking/lockdep.c:4899 lock_acquire kernel/locking/lockdep.c:5509 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5474 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x134/0x1110 kernel/locking/mutex.c:1103 wiphy_lock include/net/cfg80211.h:5267 [inline] cfg80211_netdev_notifier_call+0x615/0x1180 net/wireless/core.c:1393 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2040 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] register_netdevice+0x1034/0x14a0 net/core/dev.c:10008 virt_wifi_newlink+0x4d3/0x940 drivers/net/wireless/virt_wifi.c:541 __rtnl_newlink+0x108b/0x16e0 net/core/rtnetlink.c:3443 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 __sys_sendto+0x21c/0x320 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417c97 Code: 2c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 81 19 00 00 c3 48 83 ec 08 e8 e7 fa ff ff 48 89 04 24 49 89 ca b8 2c 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 2d fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd43a145b0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016b4300 RCX: 0000000000417c97 RDX: 000000000000004c RSI: 00000000016b4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd43a145c0 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016b4350 R15: 0000000000000003 --- 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.
