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Message-ID: <67d098bb.050a0220.14e108.001b.GAE@google.com>
Date: Tue, 11 Mar 2025 13:10:35 -0700
From: syzbot <syzbot+2393ddd2462f9a5f6d79@...kaller.appspotmail.com>
To: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
jiri@...nulli.us, kuba@...nel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] possible deadlock in __dev_open
Hello,
syzbot found the following issue on:
HEAD commit: 40587f749df2 Merge branch 'enic-enable-32-64-byte-cqes-and..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17d22654580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ca99d9d1f4a8ecfa
dashboard link: https://syzkaller.appspot.com/bug?extid=2393ddd2462f9a5f6d79
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/6d02993a9211/disk-40587f74.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2c8b300bf362/vmlinux-40587f74.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2d5be21882cf/bzImage-40587f74.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2393ddd2462f9a5f6d79@...kaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc5-syzkaller-01183-g40587f749df2 #0 Not tainted
------------------------------------------------------
syz.3.4227/19723 is trying to acquire lock:
ffff888029bf8d28 (&dev_instance_lock_key#2){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2731 [inline]
ffff888029bf8d28 (&dev_instance_lock_key#2){+.+.}-{4:4}, at: netif_set_up net/core/dev.h:143 [inline]
ffff888029bf8d28 (&dev_instance_lock_key#2){+.+.}-{4:4}, at: __dev_open+0x5cb/0x8a0 net/core/dev.c:1651
but task is already holding lock:
ffff8880309c8e00 (team->team_lock_key#6){+.+.}-{4:4}, at: team_add_slave+0xb3/0x28a0 drivers/net/team/team_core.c:1988
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (team->team_lock_key#6){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
team_set_mac_address+0x122/0x280 drivers/net/team/team_core.c:1817
netif_set_mac_address+0x327/0x510 net/core/dev.c:9605
do_setlink+0xaa6/0x40f0 net/core/rtnetlink.c:3095
rtnl_changelink net/core/rtnetlink.c:3759 [inline]
__rtnl_newlink net/core/rtnetlink.c:3918 [inline]
rtnl_newlink+0x15a6/0x1d90 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6945
netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:709 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:724
__sys_sendto+0x363/0x4c0 net/socket.c:2178
__do_sys_sendto net/socket.c:2185 [inline]
__se_sys_sendto net/socket.c:2181 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2181
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
-> #1 (&dev_instance_lock_key#12){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
netdev_lock include/linux/netdevice.h:2731 [inline]
dev_set_mac_address+0x2a/0x50 net/core/dev_api.c:302
bond_set_mac_address+0x28e/0x830 drivers/net/bonding/bond_main.c:4903
netif_set_mac_address+0x327/0x510 net/core/dev.c:9605
do_setlink+0xaa6/0x40f0 net/core/rtnetlink.c:3095
rtnl_changelink net/core/rtnetlink.c:3759 [inline]
__rtnl_newlink net/core/rtnetlink.c:3918 [inline]
rtnl_newlink+0x15a6/0x1d90 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6945
netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:709 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:724
____sys_sendmsg+0x53a/0x860 net/socket.c:2564
___sys_sendmsg net/socket.c:2618 [inline]
__sys_sendmsg+0x269/0x350 net/socket.c:2650
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 (&dev_instance_lock_key#2){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
netdev_lock include/linux/netdevice.h:2731 [inline]
netif_set_up net/core/dev.h:143 [inline]
__dev_open+0x5cb/0x8a0 net/core/dev.c:1651
netif_open+0xae/0x1b0 net/core/dev.c:1667
dev_open+0x13e/0x260 net/core/dev_api.c:191
team_port_add drivers/net/team/team_core.c:1230 [inline]
team_add_slave+0xabe/0x28a0 drivers/net/team/team_core.c:1989
do_set_master+0x579/0x730 net/core/rtnetlink.c:2943
do_setlink+0xfee/0x40f0 net/core/rtnetlink.c:3149
rtnl_changelink net/core/rtnetlink.c:3759 [inline]
__rtnl_newlink net/core/rtnetlink.c:3918 [inline]
rtnl_newlink+0x15a6/0x1d90 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6945
netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:709 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:724
____sys_sendmsg+0x53a/0x860 net/socket.c:2564
___sys_sendmsg net/socket.c:2618 [inline]
__sys_sendmsg+0x269/0x350 net/socket.c:2650
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:
Chain exists of:
&dev_instance_lock_key#2 --> &dev_instance_lock_key#12 --> team->team_lock_key#6
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(team->team_lock_key#6);
lock(&dev_instance_lock_key#12);
lock(team->team_lock_key#6);
lock(&dev_instance_lock_key#2);
*** DEADLOCK ***
2 locks held by syz.3.4227/19723:
#0: ffffffff8fed6908 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8fed6908 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8fed6908 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc4c/0x1d90 net/core/rtnetlink.c:4054
#1: ffff8880309c8e00 (team->team_lock_key#6){+.+.}-{4:4}, at: team_add_slave+0xb3/0x28a0 drivers/net/team/team_core.c:1988
stack backtrace:
CPU: 0 UID: 0 PID: 19723 Comm: syz.3.4227 Not tainted 6.14.0-rc5-syzkaller-01183-g40587f749df2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
netdev_lock include/linux/netdevice.h:2731 [inline]
netif_set_up net/core/dev.h:143 [inline]
__dev_open+0x5cb/0x8a0 net/core/dev.c:1651
netif_open+0xae/0x1b0 net/core/dev.c:1667
dev_open+0x13e/0x260 net/core/dev_api.c:191
team_port_add drivers/net/team/team_core.c:1230 [inline]
team_add_slave+0xabe/0x28a0 drivers/net/team/team_core.c:1989
do_set_master+0x579/0x730 net/core/rtnetlink.c:2943
do_setlink+0xfee/0x40f0 net/core/rtnetlink.c:3149
rtnl_changelink net/core/rtnetlink.c:3759 [inline]
__rtnl_newlink net/core/rtnetlink.c:3918 [inline]
rtnl_newlink+0x15a6/0x1d90 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6945
netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:709 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:724
____sys_sendmsg+0x53a/0x860 net/socket.c:2564
___sys_sendmsg net/socket.c:2618 [inline]
__sys_sendmsg+0x269/0x350 net/socket.c:2650
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: 0033:0x7f79fa58d169
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:00007f79fb3eb038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f79fa7a5fa0 RCX: 00007f79fa58d169
RDX: 0000000000000000 RSI: 0000400000000280 RDI: 0000000000000004
RBP: 00007f79fa60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f79fa7a5fa0 R15: 00007fff8756ece8
</TASK>
8021q: adding VLAN 0 to HW filter on device bond0
bond0: entered allmulticast mode
syz_tun: entered allmulticast mode
team0: Port device bond0 added
---
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@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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