Extracting prog: 3m0.759125148s
Minimizing prog: 12m4.967801236s
Simplifying prog options: 0s
Extracting C: 38.436238798s
Simplifying C: 16m21.373350662s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f0000000700)=[{&(0x7f0000000000)="2e00000010008188e6b62aa73772cc9f1ba1f848430000005e140602000000000e000a00100000000280", 0x2a}, {&(0x7f0000000400)="6a6f8e5e", 0x4}], 0x2}, 0x0)

program crashed: possible deadlock in team_device_event
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm
detailed listing:
executing program 0:
socket$kcm(0x10, 0x2, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$kcm
detailed listing:
executing program 0:
sendmsg$kcm(0xffffffffffffffff, &(0x7f0000000100)={0x0, 0x0, &(0x7f0000000700)=[{&(0x7f0000000000)="2e00000010008188e6b62aa73772cc9f1ba1f848430000005e140602000000000e000a00100000000280", 0x2a}, {&(0x7f0000000400)="6a6f8e5e", 0x4}], 0x2}, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, 0x0, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, &(0x7f0000000100)={0x0, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f0000000700)=[{&(0x7f0000000000)="2e00000010008188e6b62aa73772cc9f1ba1f848430000005e140602000000000e000a00100000000280", 0x2a}, {0x0}], 0x2}, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f0000000700)=[{&(0x7f0000000000)="2e00000010008188e6b62aa73772cc9f1ba1f848430000005e140602000000000e000a00100000000280", 0x2a}, {&(0x7f0000000400)}], 0x2}, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f0000000700)=[{0x0}, {&(0x7f0000000400)="6a6f8e5e", 0x4}], 0x2}, 0x0)

program did not crash
testing program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
detailed listing:
executing program 0:
r0 = socket$kcm(0x10, 0x2, 0x0)
sendmsg$kcm(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f0000000700)=[{}, {&(0x7f0000000400)="6a6f8e5e", 0x4}], 0x2}, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=53.166668532s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
simplifying C reproducer
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program did not crash
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program did not crash
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program did not crash
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:true UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
testing compiled C program (duration=53.166668532s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$kcm-sendmsg$kcm
program crashed: possible deadlock in team_device_event
reproducing took 32m5.536559409s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc4-syzkaller-gb4432656b36e #0 Not tainted
------------------------------------------------------
kworker/u8:9/3030 is trying to acquire lock:
ffff888079c3ce00 (team->team_lock_key){+.+.}-{4:4}, at: team_port_change_check drivers/net/team/team_core.c:2966 [inline]
ffff888079c3ce00 (team->team_lock_key){+.+.}-{4:4}, at: team_device_event+0x544/0xa20 drivers/net/team/team_core.c:2996

but task is already holding lock:
ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline]
ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: __linkwatch_run_queue+0x4a0/0x7e0 net/core/link_watch.c:243

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&dev_instance_lock_key#19){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       netdev_lock include/linux/netdevice.h:2751 [inline]
       netdev_lock_ops include/net/netdev_lock.h:42 [inline]
       dev_set_mtu+0x10e/0x260 net/core/dev_api.c:246
       team_port_add drivers/net/team/team_core.c:1215 [inline]
       team_add_slave+0x8b8/0x2840 drivers/net/team/team_core.c:1989
       do_set_master+0x530/0x6d0 net/core/rtnetlink.c:2946
       do_setlink+0xd47/0x40d0 net/core/rtnetlink.c:3159
       rtnl_changelink net/core/rtnetlink.c:3769 [inline]
       __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
       rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4065
       rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955
       netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534
       netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
       netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
       netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
       sock_sendmsg_nosec net/socket.c:712 [inline]
       __sock_sendmsg+0x219/0x270 net/socket.c:727
       ____sys_sendmsg+0x505/0x830 net/socket.c:2566
       ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
       __sys_sendmsg net/socket.c:2652 [inline]
       __do_sys_sendmsg net/socket.c:2657 [inline]
       __se_sys_sendmsg net/socket.c:2655 [inline]
       __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (team->team_lock_key){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
       __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       team_port_change_check drivers/net/team/team_core.c:2966 [inline]
       team_device_event+0x544/0xa20 drivers/net/team/team_core.c:2996
       notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
       netif_state_change+0x284/0x3a0 net/core/dev.c:1530
       linkwatch_do_dev+0x117/0x170 net/core/link_watch.c:186
       __linkwatch_run_queue+0x56d/0x7e0 net/core/link_watch.c:244
       linkwatch_event+0x4c/0x60 net/core/link_watch.c:304
       process_one_work kernel/workqueue.c:3238 [inline]
       process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
       worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
       kthread+0x70e/0x8a0 kernel/kthread.c:464
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dev_instance_lock_key#19);
                               lock(team->team_lock_key);
                               lock(&dev_instance_lock_key#19);
  lock(team->team_lock_key);

 *** DEADLOCK ***

4 locks held by kworker/u8:9/3030:
 #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
 #1: ffffc9000be37c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc9000be37c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
 #2: ffffffff8f2f4288 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303
 #3: ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline]
 #3: ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
 #3: ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: __linkwatch_run_queue+0x4a0/0x7e0 net/core/link_watch.c:243

stack backtrace:
CPU: 0 UID: 0 PID: 3030 Comm: kworker/u8:9 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
 team_port_change_check drivers/net/team/team_core.c:2966 [inline]
 team_device_event+0x544/0xa20 drivers/net/team/team_core.c:2996
 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
 netif_state_change+0x284/0x3a0 net/core/dev.c:1530
 linkwatch_do_dev+0x117/0x170 net/core/link_watch.c:186
 __linkwatch_run_queue+0x56d/0x7e0 net/core/link_watch.c:244
 linkwatch_event+0x4c/0x60 net/core/link_watch.c:304
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc4-syzkaller-gb4432656b36e #0 Not tainted
------------------------------------------------------
kworker/u8:9/3030 is trying to acquire lock:
ffff888079c3ce00 (team->team_lock_key){+.+.}-{4:4}, at: team_port_change_check drivers/net/team/team_core.c:2966 [inline]
ffff888079c3ce00 (team->team_lock_key){+.+.}-{4:4}, at: team_device_event+0x544/0xa20 drivers/net/team/team_core.c:2996

but task is already holding lock:
ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline]
ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: __linkwatch_run_queue+0x4a0/0x7e0 net/core/link_watch.c:243

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&dev_instance_lock_key#19){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       netdev_lock include/linux/netdevice.h:2751 [inline]
       netdev_lock_ops include/net/netdev_lock.h:42 [inline]
       dev_set_mtu+0x10e/0x260 net/core/dev_api.c:246
       team_port_add drivers/net/team/team_core.c:1215 [inline]
       team_add_slave+0x8b8/0x2840 drivers/net/team/team_core.c:1989
       do_set_master+0x530/0x6d0 net/core/rtnetlink.c:2946
       do_setlink+0xd47/0x40d0 net/core/rtnetlink.c:3159
       rtnl_changelink net/core/rtnetlink.c:3769 [inline]
       __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
       rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4065
       rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955
       netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534
       netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
       netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
       netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
       sock_sendmsg_nosec net/socket.c:712 [inline]
       __sock_sendmsg+0x219/0x270 net/socket.c:727
       ____sys_sendmsg+0x505/0x830 net/socket.c:2566
       ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
       __sys_sendmsg net/socket.c:2652 [inline]
       __do_sys_sendmsg net/socket.c:2657 [inline]
       __se_sys_sendmsg net/socket.c:2655 [inline]
       __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (team->team_lock_key){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
       __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       team_port_change_check drivers/net/team/team_core.c:2966 [inline]
       team_device_event+0x544/0xa20 drivers/net/team/team_core.c:2996
       notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
       netif_state_change+0x284/0x3a0 net/core/dev.c:1530
       linkwatch_do_dev+0x117/0x170 net/core/link_watch.c:186
       __linkwatch_run_queue+0x56d/0x7e0 net/core/link_watch.c:244
       linkwatch_event+0x4c/0x60 net/core/link_watch.c:304
       process_one_work kernel/workqueue.c:3238 [inline]
       process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
       worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
       kthread+0x70e/0x8a0 kernel/kthread.c:464
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dev_instance_lock_key#19);
                               lock(team->team_lock_key);
                               lock(&dev_instance_lock_key#19);
  lock(team->team_lock_key);

 *** DEADLOCK ***

4 locks held by kworker/u8:9/3030:
 #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
 #1: ffffc9000be37c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc9000be37c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
 #2: ffffffff8f2f4288 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303
 #3: ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline]
 #3: ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
 #3: ffff888028104d30 (&dev_instance_lock_key#19){+.+.}-{4:4}, at: __linkwatch_run_queue+0x4a0/0x7e0 net/core/link_watch.c:243

stack backtrace:
CPU: 0 UID: 0 PID: 3030 Comm: kworker/u8:9 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
 team_port_change_check drivers/net/team/team_core.c:2966 [inline]
 team_device_event+0x544/0xa20 drivers/net/team/team_core.c:2996
 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
 netif_state_change+0x284/0x3a0 net/core/dev.c:1530
 linkwatch_do_dev+0x117/0x170 net/core/link_watch.c:186
 __linkwatch_run_queue+0x56d/0x7e0 net/core/link_watch.c:244
 linkwatch_event+0x4c/0x60 net/core/link_watch.c:304
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>