possible deadlock in dev_uc

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	possible deadlock in dev_uc_sync net	C	done		3	1503d	1600d	15/28	fixed on 2020/11/16 12:12
linux-4.14	possible deadlock in dev_uc_sync				1	1554d	1554d	0/1	auto-closed as invalid on 2020/12/19 23:00

device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode ====================================================== WARNING: possible circular locking dependency detected 4.19.136-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/31530 is trying to acquire lock: 00000000736e05db (&dev_addr_list_lock_key#2/1){+...}, at: netif_addr_lock_nested include/linux/netdevice.h:3991 [inline] 00000000736e05db (&dev_addr_list_lock_key#2/1){+...}, at: dev_uc_sync+0x11a/0x1e0 net/core/dev_addr_lists.c:544 but task is already holding lock: 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: spin_lock_bh include/linux/spinlock.h:334 [inline] 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: netif_addr_lock_bh include/linux/netdevice.h:3996 [inline] 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: dev_set_rx_mode net/core/dev.c:7597 [inline] 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: __dev_open+0x264/0x3a0 net/core/dev.c:1410 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&macvlan_netdev_addr_lock_key#2/2){+...}: netif_addr_lock_nested include/linux/netdevice.h:3991 [inline] dev_uc_sync_multiple+0x11a/0x1e0 net/core/dev_addr_lists.c:574 team_set_rx_mode+0xce/0x230 drivers/net/team/team.c:1788 __dev_set_rx_mode+0x1d9/0x2f0 net/core/dev.c:7592 dev_uc_sync+0x193/0x1e0 net/core/dev_addr_lists.c:547 macvlan_set_mac_lists+0x55/0x110 drivers/net/macvlan.c:806 __dev_set_rx_mode+0x1d9/0x2f0 net/core/dev.c:7592 dev_set_rx_mode net/core/dev.c:7598 [inline] __dev_open+0x26c/0x3a0 net/core/dev.c:1410 __dev_change_flags+0x501/0x660 net/core/dev.c:7670 rtnl_configure_link+0xec/0x230 net/core/rtnetlink.c:2830 rtnl_newlink+0x104e/0x15b0 net/core/rtnetlink.c:3161 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&dev_addr_list_lock_key#2/1){+...}: _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:354 netif_addr_lock_nested include/linux/netdevice.h:3991 [inline] dev_uc_sync+0x11a/0x1e0 net/core/dev_addr_lists.c:544 macvlan_set_mac_lists+0x55/0x110 drivers/net/macvlan.c:806 __dev_set_rx_mode+0x1d9/0x2f0 net/core/dev.c:7592 dev_set_rx_mode net/core/dev.c:7598 [inline] __dev_open+0x26c/0x3a0 net/core/dev.c:1410 __dev_change_flags+0x501/0x660 net/core/dev.c:7670 rtnl_configure_link+0xec/0x230 net/core/rtnetlink.c:2830 rtnl_newlink+0x104e/0x15b0 net/core/rtnetlink.c:3161 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&macvlan_netdev_addr_lock_key#2/2); lock(&dev_addr_list_lock_key#2/1); lock(&macvlan_netdev_addr_lock_key#2/2); lock(&dev_addr_list_lock_key#2/1); *** DEADLOCK *** 2 locks held by syz-executor.3/31530: #0: 0000000067b9e03a (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 0000000067b9e03a (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4775 #1: 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: spin_lock_bh include/linux/spinlock.h:334 [inline] #1: 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: netif_addr_lock_bh include/linux/netdevice.h:3996 [inline] #1: 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: dev_set_rx_mode net/core/dev.c:7597 [inline] #1: 00000000235295eb (&macvlan_netdev_addr_lock_key#2/2){+...}, at: __dev_open+0x264/0x3a0 net/core/dev.c:1410 stack backtrace: CPU: 0 PID: 31530 Comm: syz-executor.3 Not tainted 4.19.136-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1865 [inline] check_prevs_add kernel/locking/lockdep.c:1978 [inline] validate_chain kernel/locking/lockdep.c:2419 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:354 netif_addr_lock_nested include/linux/netdevice.h:3991 [inline] dev_uc_sync+0x11a/0x1e0 net/core/dev_addr_lists.c:544 macvlan_set_mac_lists+0x55/0x110 drivers/net/macvlan.c:806 __dev_set_rx_mode+0x1d9/0x2f0 net/core/dev.c:7592 dev_set_rx_mode net/core/dev.c:7598 [inline] __dev_open+0x26c/0x3a0 net/core/dev.c:1410 __dev_change_flags+0x501/0x660 net/core/dev.c:7670 rtnl_configure_link+0xec/0x230 net/core/rtnetlink.c:2830 rtnl_newlink+0x104e/0x15b0 net/core/rtnetlink.c:3161 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45cce9 Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2560fdec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002c080 RCX: 000000000045cce9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffce7b4fa0f R14: 00007f2560fdf9c0 R15: 000000000078bf0c device macvtap0 entered promiscuous mode device team0 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvtap0 device macvtap1 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvtap1 netlink: 40 bytes leftover after parsing attributes in process `syz-executor.5'. Invalid UDP bearer configuration Enabling of bearer <udp:syz1> rejected, failed to enable media device macvtap1 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvtap1 device macvtap2 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvtap2 device macvtap2 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvtap2 device macvtap3 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvtap3 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. nla_parse: 5 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: upperdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection.