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Date:   Wed, 21 Jun 2023 12:42:46 -0700
From:   Jakub Kicinski <kuba@kernel.org>
To:     syzbot <syzbot+a7d200a347f912723e5c@syzkaller.appspotmail.com>,
        Johannes Berg <johannes@sipsolutions.net>
Cc:     bpf@vger.kernel.org, davem@davemloft.net, edumazet@google.com,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        pabeni@redhat.com, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [net?] possible deadlock in netlink_set_err
Message-ID: <20230621124246.07f9833c@kernel.org>
In-Reply-To: <000000000000e38d1605fea5747e@google.com>
References: <000000000000e38d1605fea5747e@google.com>
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Hi Johannes,

Doesn't seem like netlink_set_err() wants to be called from just any
context. Should we convert nl_table_lock to alwasy be _bh ?

On Wed, 21 Jun 2023 08:31:07 -0700 syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4e9f0ec38852 wifi: iwlwifi: pcie: Handle SO-F device for P..
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=159c29eb280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ac246111fb601aec
> dashboard link: https://syzkaller.appspot.com/bug?extid=a7d200a347f912723e5c
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/8866213bd704/disk-4e9f0ec3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/5ae048a89b9b/vmlinux-4e9f0ec3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2a5e193eed3a/bzImage-4e9f0ec3.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a7d200a347f912723e5c@syzkaller.appspotmail.com
> 
> RAX: ffffffffffffffda RBX: 00007f887bbabf80 RCX: 00007f887ba8c389
> RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006
> RBP: 00007f887c7651d0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
> R13: 00007ffc4dd1155f R14: 00007f887c765300 R15: 0000000000022000
>  </TASK>
> ========================================================
> WARNING: possible irq lock inversion dependency detected
> 6.4.0-rc6-syzkaller-00240-g4e9f0ec38852 #0 Not tainted
> --------------------------------------------------------
> syz-executor.2/23011 just changed the state of lock:
> ffffffff8e1a7a58 (nl_table_lock){.+.?}-{2:2}, at: netlink_set_err+0x2e/0x3a0 net/netlink/af_netlink.c:1612
> but this lock was taken by another, SOFTIRQ-safe lock in the past:
>  (&local->queue_stop_reason_lock){..-.}-{2:2}
> 
> 
> and interrupts could create inverse lock ordering between them.
> 
> 
> other info that might help us debug this:
>  Possible interrupt unsafe locking scenario:
> 
>        CPU0                    CPU1
>        ----                    ----
>   lock(nl_table_lock);
>                                local_irq_disable();
>                                lock(&local->queue_stop_reason_lock);
>                                lock(nl_table_lock);
>   <Interrupt>
>     lock(&local->queue_stop_reason_lock);
> 
>  *** DEADLOCK ***
> 
> 1 lock held by syz-executor.2/23011:
>  #0: ffffffff8e115ba8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
>  #0: ffffffff8e115ba8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3e8/0xd50 net/core/rtnetlink.c:6414
> 
> the shortest dependencies between 2nd lock and 1st lock:
>  -> (&local->queue_stop_reason_lock){..-.}-{2:2} {  
>     IN-SOFTIRQ-W at:
>                       lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                       lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
>                       _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
>                       ieee80211_tx_dequeue+0x1f2/0x1d50 net/mac80211/tx.c:3803
>                       wake_tx_push_queue net/mac80211/util.c:301 [inline]
>                       ieee80211_handle_wake_tx_queue+0x197/0x260 net/mac80211/util.c:322
>                       drv_wake_tx_queue net/mac80211/driver-ops.h:1241 [inline]
>                       schedule_and_wake_txq net/mac80211/driver-ops.h:1248 [inline]
>                       ieee80211_queue_skb+0x1281/0x2040 net/mac80211/tx.c:1680
>                       ieee80211_tx+0x2d2/0x420 net/mac80211/tx.c:1982
>                       ieee80211_xmit+0x30e/0x3e0 net/mac80211/tx.c:2078
>                       __ieee80211_subif_start_xmit+0xa62/0x1390 net/mac80211/tx.c:4312
>                       ieee80211_subif_start_xmit+0xf0/0x1370 net/mac80211/tx.c:4504
>                       __netdev_start_xmit include/linux/netdevice.h:4918 [inline]
>                       netdev_start_xmit include/linux/netdevice.h:4932 [inline]
>                       xmit_one net/core/dev.c:3578 [inline]
>                       dev_hard_start_xmit+0x187/0x700 net/core/dev.c:3594
>                       __dev_queue_xmit+0x2be2/0x3b10 net/core/dev.c:4244
>                       dev_queue_xmit include/linux/netdevice.h:3088 [inline]
>                       neigh_hh_output include/net/neighbour.h:528 [inline]
>                       neigh_output include/net/neighbour.h:542 [inline]
>                       ip6_finish_output2+0xfbd/0x1560 net/ipv6/ip6_output.c:134
>                       __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
>                       ip6_finish_output+0x69a/0x1170 net/ipv6/ip6_output.c:206
>                       NF_HOOK_COND include/linux/netfilter.h:292 [inline]
>                       ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
>                       dst_output include/net/dst.h:458 [inline]
>                       NF_HOOK include/linux/netfilter.h:303 [inline]
>                       ndisc_send_skb+0xa63/0x1850 net/ipv6/ndisc.c:508
>                       ndisc_send_rs+0x132/0x6f0 net/ipv6/ndisc.c:718
>                       addrconf_rs_timer+0x3f1/0x870 net/ipv6/addrconf.c:3936
>                       call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
>                       expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
>                       __run_timers kernel/time/timer.c:2022 [inline]
>                       __run_timers kernel/time/timer.c:1995 [inline]
>                       run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
>                       __do_softirq+0x1d4/0x905 kernel/softirq.c:571
>                       invoke_softirq kernel/softirq.c:445 [inline]
>                       __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
>                       irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
>                       sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106
>                       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
>                       __sanitizer_cov_trace_pc+0x60/0x70 kernel/kcov.c:223
>                       is_cow_mapping include/linux/mm.h:1543 [inline]
>                       copy_present_pte mm/memory.c:957 [inline]
>                       copy_pte_range mm/memory.c:1064 [inline]
>                       copy_pmd_range mm/memory.c:1150 [inline]
>                       copy_pud_range mm/memory.c:1187 [inline]
>                       copy_p4d_range mm/memory.c:1211 [inline]
>                       copy_page_range+0xfc4/0x3830 mm/memory.c:1309
>                       dup_mmap+0x10bc/0x19d0 kernel/fork.c:761
>                       dup_mm kernel/fork.c:1692 [inline]
>                       copy_mm kernel/fork.c:1741 [inline]
>                       copy_process+0x6663/0x75c0 kernel/fork.c:2507
>                       kernel_clone+0xeb/0x890 kernel/fork.c:2915
>                       __do_sys_clone+0xba/0x100 kernel/fork.c:3058
>                       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>                       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>                       entry_SYSCALL_64_after_hwframe+0x63/0xcd
>     INITIAL USE at:
>                      lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                      lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                      __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
>                      _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
>                      ieee80211_tx_dequeue+0x1f2/0x1d50 net/mac80211/tx.c:3803
>                      wake_tx_push_queue net/mac80211/util.c:301 [inline]
>                      ieee80211_handle_wake_tx_queue+0x197/0x260 net/mac80211/util.c:322
>                      drv_wake_tx_queue net/mac80211/driver-ops.h:1241 [inline]
>                      schedule_and_wake_txq net/mac80211/driver-ops.h:1248 [inline]
>                      ieee80211_queue_skb+0x1281/0x2040 net/mac80211/tx.c:1680
>                      ieee80211_tx+0x2d2/0x420 net/mac80211/tx.c:1982
>                      ieee80211_xmit+0x30e/0x3e0 net/mac80211/tx.c:2078
>                      __ieee80211_subif_start_xmit+0xa62/0x1390 net/mac80211/tx.c:4312
>                      ieee80211_subif_start_xmit+0xf0/0x1370 net/mac80211/tx.c:4504
>                      __netdev_start_xmit include/linux/netdevice.h:4918 [inline]
>                      netdev_start_xmit include/linux/netdevice.h:4932 [inline]
>                      xmit_one net/core/dev.c:3578 [inline]
>                      dev_hard_start_xmit+0x187/0x700 net/core/dev.c:3594
>                      __dev_queue_xmit+0x2be2/0x3b10 net/core/dev.c:4244
>                      dev_queue_xmit include/linux/netdevice.h:3088 [inline]
>                      neigh_resolve_output net/core/neighbour.c:1552 [inline]
>                      neigh_resolve_output+0x51b/0x870 net/core/neighbour.c:1532
>                      neigh_output include/net/neighbour.h:544 [inline]
>                      ip6_finish_output2+0x55a/0x1560 net/ipv6/ip6_output.c:134
>                      __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
>                      ip6_finish_output+0x69a/0x1170 net/ipv6/ip6_output.c:206
>                      NF_HOOK_COND include/linux/netfilter.h:292 [inline]
>                      ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
>                      dst_output include/net/dst.h:458 [inline]
>                      NF_HOOK include/linux/netfilter.h:303 [inline]
>                      NF_HOOK include/linux/netfilter.h:297 [inline]
>                      mld_sendpack+0xa09/0xed0 net/ipv6/mcast.c:1820
>                      mld_send_cr net/ipv6/mcast.c:2121 [inline]
>                      mld_ifc_work+0x73c/0xe20 net/ipv6/mcast.c:2653
>                      process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
>                      worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
>                      kthread+0x344/0x440 kernel/kthread.c:379
>                      ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>   }
>   ... key      at: [<ffffffff921be140>] __key.19+0x0/0x40
>   ... acquired at:
>    __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
>    _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
>    netlink_lock_table net/netlink/af_netlink.c:472 [inline]
>    netlink_broadcast+0x74/0xd90 net/netlink/af_netlink.c:1533
>    nlmsg_multicast include/net/netlink.h:1083 [inline]
>    genlmsg_multicast_netns include/net/genetlink.h:392 [inline]
>    nl80211_frame_tx_status+0x9dc/0xc20 net/wireless/nl80211.c:18807
>    ieee80211_report_ack_skb net/mac80211/status.c:680 [inline]
>    ieee80211_report_used_skb+0x107f/0x1a10 net/mac80211/status.c:763
>    ieee80211_free_txskb+0x24/0x40 net/mac80211/status.c:1260
>    ieee80211_do_stop+0xc71/0x1f50 net/mac80211/iface.c:640
>    ieee80211_runtime_change_iftype net/mac80211/iface.c:1866 [inline]
>    ieee80211_if_change_type+0x416/0x8b0 net/mac80211/iface.c:1904
>    ieee80211_change_iface+0x5b/0x440 net/mac80211/cfg.c:217
>    rdev_change_virtual_intf net/wireless/rdev-ops.h:74 [inline]
>    cfg80211_change_iface+0x5c1/0xe00 net/wireless/util.c:1163
>    nl80211_set_interface+0x695/0x960 net/wireless/nl80211.c:4217
>    genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968
>    genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
>    genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065
>    netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546
>    genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076
>    netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
>    netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
>    netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
>    sock_sendmsg_nosec net/socket.c:724 [inline]
>    sock_sendmsg+0xde/0x190 net/socket.c:747
>    ____sys_sendmsg+0x71c/0x900 net/socket.c:2503
>    ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
>    __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586
>    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>    do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>    entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> -> (nl_table_lock){.+.?}-{2:2} {  
>    HARDIRQ-ON-R at:
>                     lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                     lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                     __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
>                     _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
>                     netlink_set_err+0x2e/0x3a0 net/netlink/af_netlink.c:1612
>                     rtnl_set_sk_err net/core/rtnetlink.c:779 [inline]
>                     rtmsg_ifinfo_build_skb+0x226/0x280 net/core/rtnetlink.c:4029
>                     rtmsg_ifinfo_event net/core/rtnetlink.c:4051 [inline]
>                     rtmsg_ifinfo_event net/core/rtnetlink.c:4041 [inline]
>                     rtmsg_ifinfo+0x9f/0x1a0 net/core/rtnetlink.c:4060
>                     netdev_state_change net/core/dev.c:1319 [inline]
>                     netdev_state_change+0x11e/0x130 net/core/dev.c:1310
>                     do_setlink+0x2f6a/0x3b70 net/core/rtnetlink.c:3102
>                     rtnl_group_changelink net/core/rtnetlink.c:3402 [inline]
>                     __rtnl_newlink+0xb90/0x1840 net/core/rtnetlink.c:3658
>                     rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3695
>                     rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417
>                     netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546
>                     netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
>                     netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
>                     netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
>                     sock_sendmsg_nosec net/socket.c:724 [inline]
>                     sock_sendmsg+0xde/0x190 net/socket.c:747
>                     ____sys_sendmsg+0x71c/0x900 net/socket.c:2503
>                     ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
>                     __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586
>                     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>                     do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>                     entry_SYSCALL_64_after_hwframe+0x63/0xcd
>    IN-SOFTIRQ-R at:
>                     lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                     lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                     __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
>                     _raw_read_lock_irqsave+0x49/0x90 kernel/locking/spinlock.c:236
>                     netlink_lock_table net/netlink/af_netlink.c:472 [inline]
>                     netlink_broadcast+0x74/0xd90 net/netlink/af_netlink.c:1533
>                     nlmsg_multicast include/net/netlink.h:1083 [inline]
>                     nlmsg_notify+0x93/0x280 net/netlink/af_netlink.c:2589
>                     __neigh_notify+0xdc/0x160 net/core/neighbour.c:3513
>                     neigh_update_notify net/core/neighbour.c:2655 [inline]
>                     __neigh_update+0x109a/0x2bb0 net/core/neighbour.c:1469
>                     arp_process+0x863/0x21b0 net/ipv4/arp.c:932
>                     NF_HOOK include/linux/netfilter.h:303 [inline]
>                     NF_HOOK include/linux/netfilter.h:297 [inline]
>                     arp_rcv net/ipv4/arp.c:988 [inline]
>                     arp_rcv+0x3d2/0x540 net/ipv4/arp.c:963
>                     __netif_receive_skb_list_ptype net/core/dev.c:5541 [inline]
>                     __netif_receive_skb_list_ptype net/core/dev.c:5525 [inline]
>                     __netif_receive_skb_list_core+0x6c6/0x8f0 net/core/dev.c:5584
>                     __netif_receive_skb_list net/core/dev.c:5636 [inline]
>                     netif_receive_skb_list_internal+0x75f/0xdc0 net/core/dev.c:5727
>                     gro_normal_list include/net/gro.h:433 [inline]
>                     gro_normal_list include/net/gro.h:429 [inline]
>                     napi_complete_done+0x243/0x9a0 net/core/dev.c:6067
>                     virtqueue_napi_complete drivers/net/virtio_net.c:408 [inline]
>                     virtnet_poll+0xe2b/0x14b0 drivers/net/virtio_net.c:1858
>                     __napi_poll+0xb7/0x6f0 net/core/dev.c:6498
>                     napi_poll net/core/dev.c:6565 [inline]
>                     net_rx_action+0x8a9/0xcb0 net/core/dev.c:6698
>                     __do_softirq+0x1d4/0x905 kernel/softirq.c:571
>                     invoke_softirq kernel/softirq.c:445 [inline]
>                     __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
>                     irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
>                     common_interrupt+0xad/0xd0 arch/x86/kernel/irq.c:240
>                     asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
>                     rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
>                     cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
>                     csd_lock_wait kernel/smp.c:285 [inline]
>                     smp_call_function_many_cond+0x67f/0x15a0 kernel/smp.c:828
>                     on_each_cpu_cond_mask+0x5a/0xa0 kernel/smp.c:996
>                     on_each_cpu include/linux/smp.h:71 [inline]
>                     text_poke_sync arch/x86/kernel/alternative.c:1770 [inline]
>                     text_poke_bp_batch+0x634/0x770 arch/x86/kernel/alternative.c:2053
>                     text_poke_flush arch/x86/kernel/alternative.c:2161 [inline]
>                     text_poke_flush arch/x86/kernel/alternative.c:2158 [inline]
>                     text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2168
>                     arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146
>                     jump_label_update+0x32f/0x410 kernel/jump_label.c:829
>                     static_key_disable_cpuslocked+0x156/0x1b0 kernel/jump_label.c:235
>                     static_key_disable+0x1a/0x20 kernel/jump_label.c:243
>                     once_deferred+0x68/0xc0 lib/once.c:20
>                     process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
>                     worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
>                     kthread+0x344/0x440 kernel/kthread.c:379
>                     ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>    SOFTIRQ-ON-R at:
>                     lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                     lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                     __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
>                     _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
>                     netlink_set_err+0x2e/0x3a0 net/netlink/af_netlink.c:1612
>                     rtnl_set_sk_err net/core/rtnetlink.c:779 [inline]
>                     rtmsg_ifinfo_build_skb+0x226/0x280 net/core/rtnetlink.c:4029
>                     rtmsg_ifinfo_event net/core/rtnetlink.c:4051 [inline]
>                     rtmsg_ifinfo_event net/core/rtnetlink.c:4041 [inline]
>                     rtmsg_ifinfo+0x9f/0x1a0 net/core/rtnetlink.c:4060
>                     netdev_state_change net/core/dev.c:1319 [inline]
>                     netdev_state_change+0x11e/0x130 net/core/dev.c:1310
>                     do_setlink+0x2f6a/0x3b70 net/core/rtnetlink.c:3102
>                     rtnl_group_changelink net/core/rtnetlink.c:3402 [inline]
>                     __rtnl_newlink+0xb90/0x1840 net/core/rtnetlink.c:3658
>                     rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3695
>                     rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417
>                     netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546
>                     netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
>                     netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
>                     netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
>                     sock_sendmsg_nosec net/socket.c:724 [inline]
>                     sock_sendmsg+0xde/0x190 net/socket.c:747
>                     ____sys_sendmsg+0x71c/0x900 net/socket.c:2503
>                     ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
>                     __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586
>                     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>                     do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>                     entry_SYSCALL_64_after_hwframe+0x63/0xcd
>    INITIAL USE at:
>                    lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                    lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                    __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
>                    _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
>                    netlink_table_grab net/netlink/af_netlink.c:438 [inline]
>                    netlink_add_usersock_entry net/netlink/af_netlink.c:2851 [inline]
>                    netlink_proto_init+0x158/0x3d0 net/netlink/af_netlink.c:2942
>                    do_one_initcall+0x102/0x540 init/main.c:1246
>                    do_initcall_level init/main.c:1319 [inline]
>                    do_initcalls init/main.c:1335 [inline]
>                    do_basic_setup init/main.c:1354 [inline]
>                    kernel_init_freeable+0x64e/0xba0 init/main.c:1571
>                    kernel_init+0x1e/0x2c0 init/main.c:1462
>                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>    INITIAL READ USE at:
>                         lock_acquire kernel/locking/lockdep.c:5705 [inline]
>                         lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>                         __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
>                         _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236
>                         netlink_lock_table net/netlink/af_netlink.c:472 [inline]
>                         netlink_broadcast+0x74/0xd90 net/netlink/af_netlink.c:1533
>                         nlmsg_multicast include/net/netlink.h:1083 [inline]
>                         genlmsg_multicast_netns include/net/genetlink.h:392 [inline]
>                         genl_ctrl_event.isra.0+0x3be/0xa50 net/netlink/genetlink.c:1360
>                         genl_register_family.part.0+0x72b/0xf20 net/netlink/genetlink.c:675
>                         genl_register_family+0x35/0x50 net/netlink/genetlink.c:635
>                         thermal_init+0x16/0x370 drivers/thermal/thermal_core.c:1533
>                         do_one_initcall+0x102/0x540 init/main.c:1246
>                         do_initcall_level init/main.c:1319 [inline]
>                         do_initcalls init/main.c:1335 [inline]
>                         do_basic_setup init/main.c:1354 [inline]
>                         kernel_init_freeable+0x64e/0xba0 init/main.c:1571
>                         kernel_init+0x1e/0x2c0 init/main.c:1462
>                         ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>  }
>  ... key      at: [<ffffffff8e1a7a58>] nl_table_lock+0x18/0x60
>  ... acquired at:
>    mark_lock kernel/locking/lockdep.c:4620 [inline]
>    mark_usage kernel/locking/lockdep.c:4569 [inline]
>    __lock_acquire+0x8ef/0x5f30 kernel/locking/lockdep.c:5042
>    lock_acquire kernel/locking/lockdep.c:5705 [inline]
>    lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
>    _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
>    netlink_set_err+0x2e/0x3a0 net/netlink/af_netlink.c:1612
>    rtnl_set_sk_err net/core/rtnetlink.c:779 [inline]
>    rtmsg_ifinfo_build_skb+0x226/0x280 net/core/rtnetlink.c:4029
>    rtmsg_ifinfo_event net/core/rtnetlink.c:4051 [inline]
>    rtmsg_ifinfo_event net/core/rtnetlink.c:4041 [inline]
>    rtmsg_ifinfo+0x9f/0x1a0 net/core/rtnetlink.c:4060
>    netdev_state_change net/core/dev.c:1319 [inline]
>    netdev_state_change+0x11e/0x130 net/core/dev.c:1310
>    do_setlink+0x2f6a/0x3b70 net/core/rtnetlink.c:3102
>    rtnl_group_changelink net/core/rtnetlink.c:3402 [inline]
>    __rtnl_newlink+0xb90/0x1840 net/core/rtnetlink.c:3658
>    rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3695
>    rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417
>    netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546
>    netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
>    netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
>    netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
>    sock_sendmsg_nosec net/socket.c:724 [inline]
>    sock_sendmsg+0xde/0x190 net/socket.c:747
>    ____sys_sendmsg+0x71c/0x900 net/socket.c:2503
>    ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
>    __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586
>    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>    do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>    entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> 
> stack backtrace:
> CPU: 0 PID: 23011 Comm: syz-executor.2 Not tainted 6.4.0-rc6-syzkaller-00240-g4e9f0ec38852 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
>  print_irq_inversion_bug.part.0+0x3d9/0x580 kernel/locking/lockdep.c:4058
>  print_irq_inversion_bug kernel/locking/lockdep.c:4011 [inline]
>  check_usage_backwards kernel/locking/lockdep.c:4124 [inline]
>  mark_lock_irq kernel/locking/lockdep.c:4214 [inline]
>  mark_lock.part.0+0x822/0x1970 kernel/locking/lockdep.c:4656
>  mark_lock kernel/locking/lockdep.c:4620 [inline]
>  mark_usage kernel/locking/lockdep.c:4569 [inline]
>  __lock_acquire+0x8ef/0x5f30 kernel/locking/lockdep.c:5042
>  lock_acquire kernel/locking/lockdep.c:5705 [inline]
>  lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
>  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
>  _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
>  netlink_set_err+0x2e/0x3a0 net/netlink/af_netlink.c:1612
>  rtnl_set_sk_err net/core/rtnetlink.c:779 [inline]
>  rtmsg_ifinfo_build_skb+0x226/0x280 net/core/rtnetlink.c:4029
>  rtmsg_ifinfo_event net/core/rtnetlink.c:4051 [inline]
>  rtmsg_ifinfo_event net/core/rtnetlink.c:4041 [inline]
>  rtmsg_ifinfo+0x9f/0x1a0 net/core/rtnetlink.c:4060
>  netdev_state_change net/core/dev.c:1319 [inline]
>  netdev_state_change+0x11e/0x130 net/core/dev.c:1310
>  do_setlink+0x2f6a/0x3b70 net/core/rtnetlink.c:3102
>  rtnl_group_changelink net/core/rtnetlink.c:3402 [inline]
>  __rtnl_newlink+0xb90/0x1840 net/core/rtnetlink.c:3658
>  rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3695
>  rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417
>  netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546
>  netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
>  netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
>  netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
>  sock_sendmsg_nosec net/socket.c:724 [inline]
>  sock_sendmsg+0xde/0x190 net/socket.c:747
>  ____sys_sendmsg+0x71c/0x900 net/socket.c:2503
>  ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
>  __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f887ba8c389
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f887c765168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00007f887bbabf80 RCX: 00007f887ba8c389
> RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006
> RBP: 00007f887c7651d0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
> R13: 00007ffc4dd1155f R14: 00007f887c765300 R15: 0000000000022000
>  </TASK>
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
> 
> 
> ---
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> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 
> If the bug is already fixed, let syzbot know by replying with:
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> 
> If you want to change bug's subsystems, reply with:
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> (See the list of subsystem names on the web dashboard)
> 
> If the bug is a duplicate of another bug, reply with:
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> 
> If you want to undo deduplication, reply with:
> #syz undup