rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-...D } 2659 jiffies s: 34513 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5725 Comm: udevd Not tainted 6.10.0-rc4-next-20240621-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:406
Code: 40 12 54 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 41 79 ba fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c
RSP: 0018:ffffc90000a176b8 EFLAGS: 00000002
RAX: 1ffffffff2961100 RBX: ffffffff94b08b80 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff853f6886 R09: 1ffff11003ec8046
R10: dffffc0000000000 R11: ffffffff853f6840 R12: dffffc0000000000
R13: ffffffff9481cbc0 R14: 00000000000003fd R15: dffffc0000000000
FS:  00007fc6a3edbc80(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ffb510e868 CR3: 000000007b8be000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_in drivers/tty/serial/8250/8250.h:137 [inline]
 serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
 wait_for_lsr drivers/tty/serial/8250/8250_port.c:2068 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
 serial8250_console_write+0x1373/0x1ed0 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:2975 [inline]
 console_flush_all+0x880/0xf50 kernel/printk/printk.c:3047
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
 vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2420
 _printk+0xd5/0x120 kernel/printk/printk.c:2447
 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x43a/0x520 arch/x86/kernel/dumpstack.c:285
 sched_show_task+0x578/0x740 kernel/sched/core.c:7503
 show_state_filter+0x19e/0x270 kernel/sched/core.c:7548
 kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
 kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1541
 input_to_handler drivers/input/input.c:132 [inline]
 input_pass_values+0x945/0x1200 drivers/input/input.c:161
 input_event_dispose+0x402/0x650 drivers/input/input.c:389
 input_handle_event+0xa71/0xbe0 drivers/input/input.c:406
 input_event+0xa4/0xd0 drivers/input/input.c:435
 hidinput_hid_event+0x138c/0x1ca0 drivers/hid/hid-input.c:1746
 hid_process_event+0x439/0x590 drivers/hid/hid-core.c:1540
 hid_input_array_field+0x401/0x5d0 drivers/hid/hid-core.c:1652
 hid_process_report drivers/hid/hid-core.c:1694 [inline]
 hid_report_raw_event+0xf4b/0x18a0 drivers/hid/hid-core.c:2015
 hid_input_report+0x416/0x500 drivers/hid/hid-core.c:2089
 hid_irq_in+0x4a0/0x6d0 drivers/hid/usbhid/hid-core.c:285
 __usb_hcd_giveback_urb+0x42c/0x6e0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x830/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1987
 __run_hrtimer kernel/time/hrtimer.c:1687 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1751
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1813
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:86 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x79/0x290 mm/kasan/generic.c:189
Code: 4d 89 c1 49 c1 e9 03 49 be 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 <4c> 89 cd 48 f7 d5 48 01 dd 41 80 3b 00 0f 85 c9 01 00 00 49 ff c3
RSP: 0018:ffffc900122a76d0 EFLAGS: 00000202
RAX: ffff888029a21e01 RBX: 1ffff11002bdbd2f RCX: ffffffff816e9d95
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888015ede978
RBP: 0000000000000001 R08: ffff888015ede97f R09: 1ffff11002bdbd2f
R10: dffffc0000000000 R11: ffffed1002bdbd2f R12: 1ffff92002454ee8
R13: ffff888015ede978 R14: dffffc0000000001 R15: ffffed1002bdbd30
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_long_try_cmpxchg include/linux/atomic/atomic-instrumented.h:4434 [inline]
 rwsem_clear_reader_owned kernel/locking/rwsem.c:213 [inline]
 __up_read+0x1f5/0x6b0 kernel/locking/rwsem.c:1346
 kernfs_iop_permission+0x390/0x4d0 fs/kernfs/inode.c:290
 do_inode_permission fs/namei.c:468 [inline]
 inode_permission+0x23b/0x460 fs/namei.c:535
 may_lookup fs/namei.c:1733 [inline]
 link_path_walk+0x2ef/0xea0 fs/namei.c:2280
 path_lookupat+0xa9/0x450 fs/namei.c:2503
 filename_lookup+0x256/0x610 fs/namei.c:2533
 vfs_statx+0x105/0x4e0 fs/stat.c:244
 vfs_fstatat+0x12f/0x190 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat fs/stat.c:462 [inline]
 __x64_sys_newfstatat+0x125/0x1b0 fs/stat.c:462
 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: 0033:0x7fc6a3b165f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffc95be1a88 EFLAGS: 00000202 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000055ffb5109fe0 RCX: 00007fc6a3b165f4
RDX: 00007ffc95be1a98 RSI: 00007ffc95be1b28 RDI: 00000000ffffff9c
RBP: 000055ffb351a7be R08: 000055ffb351a7be R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000202 R12: 0000000000000000
R13: 000055ffb510a0d0 R14: 00007ffc95be1b28 R15: 000055ffb50fbed0
 </TASK>
DEBUG: waiting rtnl_mutex for 2737 jiffies.
task:kworker/u8:2    state:D
 stack:20376 pid:35    tgid:35    ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
 kthread+0x2f0/0x390 kernel/kthread.c:389

Call Trace:
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 <TASK>
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
task:cec-vivid-006-v state:S stack:29600 pid:2123  tgid:2123  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 kthread+0x2f0/0x390 kernel/kthread.c:389
 addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-006-v state:S
 stack:29600 pid:2124  tgid:2124  ppid:2      flags:0x00004000
 process_one_work kernel/workqueue.c:3224 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3385
 kthread+0x2f0/0x390 kernel/kthread.c:389
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
DEBUG: waiting rtnl_mutex for 2778 jiffies.
task:syz-executor.4  state:D
 kthread+0x2f0/0x390 kernel/kthread.c:389
 stack:20288 pid:5745  tgid:5745  ppid:1      flags:0x00000006
Call Trace:
 <TASK>
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:vivid_cec-vivid state:S
 stack:29280 pid:2125  tgid:2125  ppid:2      flags:0x00004000
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
Call Trace:
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 <TASK>
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-007-v state:S stack:29600 pid:2139  tgid:2139  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 </TASK>
task:cec-vivid-007-v state:S
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
 stack:29600 pid:2140  tgid:2140  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __do_sys_sendto net/socket.c:2216 [inline]
 __se_sys_sendto net/socket.c:2212 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2212
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d36c7ed9c
RSP: 002b:00007fff174420c0 EFLAGS: 00000293
 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9d378e4620 RCX: 00007f9d36c7ed9c
 kthread+0x2f0/0x390 kernel/kthread.c:389
RDX: 0000000000000028 RSI: 00007f9d378e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fff17442114 R09: 000000000000000c
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
R13: 0000000000000000 R14: 00007f9d378e4670 R15: 0000000000000000
 </TASK>
task:vivid_cec-vivid state:S
 </TASK>
 stack:29280 pid:2141  tgid:2141  ppid:2      flags:0x00004000
Call Trace:
DEBUG: waiting rtnl_mutex for 2847 jiffies.
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
task:dhcpcd          state:D
 stack:20384 pid:4760  tgid:4760  ppid:4759   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 kthread+0x2f0/0x390 kernel/kthread.c:389
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-008-v state:S
 rtnl_lock net/core/rtnetlink.c:147 [inline]
 rtnl_dumpit+0x1bd/0x300 net/core/rtnetlink.c:6585
 stack:29600 pid:2155  tgid:2155  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 netlink_dump+0x647/0xd80 net/netlink/af_netlink.c:2325
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 netlink_recvmsg+0x6bb/0x11d0 net/netlink/af_netlink.c:1983
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-008-v state:S stack:29600 pid:2156  tgid:2156  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg+0x22f/0x280 net/socket.c:1068
 ____sys_recvmsg+0x1db/0x470 net/socket.c:2816
 ___sys_recvmsg net/socket.c:2858 [inline]
 __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 kthread+0x2f0/0x390 kernel/kthread.c:389
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc33bbcd91e
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
RSP: 002b:00007ffc330c1858 EFLAGS: 00000246
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 ORIG_RAX: 000000000000002f
task:vivid_cec-vivid state:S stack:29280 pid:2157  tgid:2157  ppid:2      flags:0x00004000
RAX: ffffffffffffffda RBX: 00007ffc330c2980 RCX: 00007fc33bbcd91e
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
RDX: 0000000000000000 RSI: 00007ffc330c28a0 RDI: 0000000000000008
RBP: 00007ffc330c2910 R08: 0000000000000000 R09: 0000000000040000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000ef0
R13: 00007ffc330c2884 R14: 00007ffc330c28a0 R15: 00007ffc330c2890
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 </TASK>
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
DEBUG: waiting rtnl_mutex for 2901 jiffies.
task:syz-executor.0  state:D
 stack:19824 pid:5747  tgid:5747  ppid:1      flags:0x00000006
 kthread+0x2f0/0x390 kernel/kthread.c:389
Call Trace:
 <TASK>
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-009-v state:S
 stack:29600 pid:2171  tgid:2171  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-009-v state:S
 stack:29600 pid:2172  tgid:2172  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:vivid_cec-vivid state:S stack:29280 pid:2173  tgid:2173  ppid:2      flags:0x00004000
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 __do_sys_sendto net/socket.c:2216 [inline]
 __se_sys_sendto net/socket.c:2212 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2212
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 </TASK>
task:cec-vivid-010-v state:S
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 stack:29600 pid:2187  tgid:2187  ppid:2      flags:0x00004000
RIP: 0033:0x7f09d967ed9c
Call Trace:
RSP: 002b:00007fffabc51170 EFLAGS: 00000293
 <TASK>
 ORIG_RAX: 000000000000002c
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
RAX: ffffffffffffffda RBX: 00007f09da2e4620 RCX: 00007f09d967ed9c
RDX: 0000000000000040 RSI: 00007f09da2e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fffabc511c4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
R13: 0000000000000000 R14: 00007f09da2e4670 R15: 0000000000000000
 </TASK>
DEBUG: waiting rtnl_mutex for 2957 jiffies.
task:kworker/0:10    state:D
 stack:25360 pid:5671  tgid:5671  ppid:2      flags:0x00004000
Workqueue: events linkwatch_event

 kthread+0x2f0/0x390 kernel/kthread.c:389
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-010-v state:S stack:29600 pid:2188  tgid:2188  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 kthread+0x2f0/0x390 kernel/kthread.c:389
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:vivid_cec-vivid state:S stack:29280 pid:2189  tgid:2189  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 linkwatch_event+0xe/0x60 net/core/link_watch.c:276
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 process_one_work kernel/workqueue.c:3224 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3385
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-011-v state:S
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 stack:29600 pid:2203  tgid:2203  ppid:2      flags:0x00004000
Call Trace:
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/1:0/25:
 #0: 
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
ffff88801b6d8548
 (
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3199 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 #1: 
 kthread+0x2f0/0x390 kernel/kthread.c:389
ffffc900001f7d00
 (
(work_completion)(&hub->events)
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3200 [inline]
, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 #2: 
 </TASK>
ffff8880236a1190
task:cec-vivid-011-v state:S
 (
 stack:29600 pid:2204  tgid:2204  ppid:2      flags:0x00004000
&dev->mutex
Call Trace:
){....}-{3:3}
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
, at: device_lock include/linux/device.h:1009 [inline]
, at: hub_event+0x1fe/0x5150 drivers/usb/core/hub.c:5849
 #3: 
ffff8880236a4518
 (
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
&port_dev->status_lock
){+.+.}-{3:3}
, at: usb_lock_port drivers/usb/core/hub.c:3206 [inline]
, at: hub_port_connect drivers/usb/core/hub.c:5418 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
, at: port_event drivers/usb/core/hub.c:5821 [inline]
, at: hub_event+0x25b6/0x5150 drivers/usb/core/hub.c:5903
 #4: 
ffff88802303cb68
 (
 kthread+0x2f0/0x390 kernel/kthread.c:389
hcd->address0_mutex
){+.+.}-{3:3}
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
, at: hub_port_connect drivers/usb/core/hub.c:5419 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
, at: port_event drivers/usb/core/hub.c:5821 [inline]
, at: hub_event+0x25f4/0x5150 drivers/usb/core/hub.c:5903
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 #5: 
 </TASK>
task:vivid_cec-vivid state:S
ffffffff8ef2e3b0
 stack:29280 pid:2205  tgid:2205  ppid:2      flags:0x00004000
Call Trace:
 (
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
ehci_cf_port_reset_rwsem
){.+.+}-{3:3}
, at: hub_port_reset+0x1f8/0x1b30 drivers/usb/core/hub.c:3021
3 locks held by kworker/u8:2/35:
 #0: 
ffff88802a278948
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 (
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3199 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 kthread+0x2f0/0x390 kernel/kthread.c:389
 #1: 
ffffc90000ab7d00
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 (
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
(work_completion)(&(&ifa->dad_work)->work)
task:cec-vivid-012-v state:S
){+.+.}-{0:0}
 stack:29680 pid:2219  tgid:2219  ppid:2      flags:0x00004000
, at: process_one_work kernel/workqueue.c:3200 [inline]
, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
Call Trace:
 #2: 
 <TASK>
ffffffff8f5f7d08
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 (
rtnl_mutex
){+.+.}-{3:3}
, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193
2 locks held by dhcpcd/4760:
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 #0: 
ffff88805c504678
 (
nlk_cb_mutex-ROUTE
){+.+.}-{3:3}
 kthread+0x2f0/0x390 kernel/kthread.c:389
, at: netlink_dump+0xcb/0xd80 net/netlink/af_netlink.c:2271
 #1: 
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
ffffffff8f5f7d08
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 (
task:cec-vivid-012-v state:S stack:29600 pid:2220  tgid:2220  ppid:2      flags:0x00004000
rtnl_mutex
Call Trace:
){+.+.}-{3:3}
 <TASK>
, at: rtnl_lock net/core/rtnetlink.c:147 [inline]
, at: rtnl_dumpit+0x1bd/0x300 net/core/rtnetlink.c:6585
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
2 locks held by getty/4850:
 #0: 
ffff88802acfb0a0
 (
&tty->ldisc_sem
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: 
ffffc90002efe2f0
 kthread+0x2f0/0x390 kernel/kthread.c:389
 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
4 locks held by syz-fuzzer/5100:
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 #0: 
 </TASK>
ffff88801e97d718
task:vivid_cec-vivid state:S
 (
 stack:29280 pid:2221  tgid:2221  ppid:2      flags:0x00004000
&mm->mmap_lock
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
){++++}-{3:3}
, at: mmap_write_lock include/linux/mmap_lock.h:106 [inline]
, at: exit_mmap+0x2a9/0xc80 mm/mmap.c:3390
 #1: 
ffffc90000007c00
 (
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
net/core/rtnetlink.c:82
){+.-.}-{0:0}
, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1789
 #2: 
ffffffff8e3357a0
 (
 kthread+0x2f0/0x390 kernel/kthread.c:389
rcu_read_lock
){....}-{1:2}
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:845 [inline]
, at: report_rtnl_holders+0x20/0x2d0 net/core/rtnetlink.c:95
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 #3: 
 </TASK>
ffffffff8e3357a0
task:cec-vivid-013-v state:S stack:29600 pid:2235  tgid:2235  ppid:2      flags:0x00004000
 (
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:845 [inline]
, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6688
3 locks held by kworker/0:10/5671:
 #0: 
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
ffff888015080948
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 (
(wq_completion)events
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3199 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 #1: 
ffffc90012177d00
 kthread+0x2f0/0x390 kernel/kthread.c:389
 (
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
(linkwatch_work).work
){+.+.}-{0:0}
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
, at: process_one_work kernel/workqueue.c:3200 [inline]
, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
 </TASK>
task:cec-vivid-013-v state:S
 #2: 
 stack:29600 pid:2236  tgid:2236  ppid:2      flags:0x00004000
ffffffff8f5f7d08
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 (
rtnl_mutex
){+.+.}-{3:3}
, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
8 locks held by udevd/5725:
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
2 locks held by syz-executor.1/5734:
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 #0: 
ffffffff8f5f7d08
 (
rtnl_mutex
 kthread+0x2f0/0x390 kernel/kthread.c:389
){+.+.}-{3:3}
, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 #1: 
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
ffffffff8e33ab78
task:vivid_cec-vivid state:S
 (
 stack:29280 pid:2237  tgid:2237  ppid:2      flags:0x00004000
rcu_state.exp_mutex
Call Trace:
){+.+.}-{3:3}
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:959
1 lock held by syz-executor.2/5742:
 #0: 
ffff888015ede9e0 (
&root->kernfs_iattr_rwsem
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
){++++}-{3:3}
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
, at: kernfs_iop_permission+0xb0/0x4d0 fs/kernfs/inode.c:287
1 lock held by syz-executor.4/5745:
 #0: 
ffffffff8f5f7d08
 kthread+0x2f0/0x390 kernel/kthread.c:389
 (
rtnl_mutex
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
){+.+.}-{3:3}
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
 </TASK>
1 lock held by syz-executor.0/5747:
task:cec-vivid-014-v state:S
 #0: 
 stack:29600 pid:2251  tgid:2251  ppid:2      flags:0x00004000
ffffffff8f5f7d08
Call Trace:
 (
 <TASK>
rtnl_mutex
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
){+.+.}-{3:3}
, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
1 lock held by syz-executor.3/5749:
 #0: 
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
ffff888015ede9e0
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 (
&root->kernfs_iattr_rwsem
){++++}-{3:3}
, at: kernfs_iop_permission+0xb0/0x4d0 fs/kernfs/inode.c:287
2 locks held by syz-executor.2/5970:
 #0: 
 kthread+0x2f0/0x390 kernel/kthread.c:389
ffff888015ede948
 (
&root->kernfs_rwsem
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
){++++}-{3:3}
, at: kernfs_remove_by_name_ns+0x7a/0x160 fs/kernfs/dir.c:1689
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 #1: 
 </TASK>
ffff888015ede9e0
task:cec-vivid-014-v state:S
 (
 stack:29600 pid:2252  tgid:2252  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
&root->kernfs_iattr_rwsem
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
){++++}-{3:3}
, at: kernfs_unlink_sibling fs/kernfs/dir.c:413 [inline]
, at: __kernfs_remove+0x4ba/0x870 fs/kernfs/dir.c:1492
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
1 lock held by syz-executor.3/5983:
 #0: 
ffff888015ede948
 (
&root->kernfs_rwsem
){++++}-{3:3}
 kthread+0x2f0/0x390 kernel/kthread.c:389
, at: kernfs_remove_by_name_ns+0x7a/0x160 fs/kernfs/dir.c:1689

=============================================

 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:vivid_cec-vivid state:S stack:29280 pid:2253  tgid:2253  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:cec-vivid-015-v state:S stack:29600 pid:2267  tgid:2267  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
DEBUG: waiting rtnl_mutex for 3313 jiffies.
task:kworker/u8:2    state:D
 kthread+0x2f0/0x390 kernel/kthread.c:389
 stack:20376 pid:35    tgid:35    ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work

 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
Call Trace:
 <TASK>
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
task:cec-vivid-015-v state:S stack:29600 pid:2268  tgid:2268  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 cec_thread_func+0x379/0x13e0 drivers/media/cec/core/cec-adap.c:478
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 kthread+0x2f0/0x390 kernel/kthread.c:389
 addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 process_one_work kernel/workqueue.c:3224 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:vivid_cec-vivid state:S
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3385
 stack:29280 pid:2269  tgid:2269  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 vivid_cec_bus_thread+0x23b/0x1310 drivers/media/test-drivers/vivid/vivid-cec.c:116
 </TASK>
DEBUG: waiting rtnl_mutex for 3347 jiffies.
task:syz-executor.4  state:D
 stack:20288 pid:5745  tgid:5745  ppid:1      flags:0x00000006
 kthread+0x2f0/0x390 kernel/kthread.c:389
Call Trace:
 <TASK>
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/R-raid5 state:I
 stack:29696 pid:2299  tgid:2299  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/R-bch_b state:I
 stack:27504 pid:2300  tgid:2300  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 kthread+0x2f0/0x390 kernel/kthread.c:389
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/R-bcach state:I
 stack:29696 pid:2302  tgid:2302  ppid:2      flags:0x00004000
Call Trace:
 __do_sys_sendto net/socket.c:2216 [inline]
 __se_sys_sendto net/socket.c:2212 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2212
 <TASK>
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d36c7ed9c
RSP: 002b:00007fff174420c0 EFLAGS: 00000293
 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9d378e4620 RCX: 00007f9d36c7ed9c
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
RDX: 0000000000000028 RSI: 00007f9d378e4670 RDI: 0000000000000003
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
RBP: 0000000000000000 R08: 00007fff17442114 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f9d378e4670 R15: 0000000000000000
 </TASK>
 kthread+0x2f0/0x390 kernel/kthread.c:389
DEBUG: waiting rtnl_mutex for 3416 jiffies.
task:dhcpcd          state:D
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 stack:20384 pid:4760  tgid:4760  ppid:4759   flags:0x00000002
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Call Trace:
 </TASK>
task:kworker/R-bch_j state:I
 <TASK>
 stack:29696 pid:2303  tgid:2303  ppid:2      flags:0x00004000
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 rtnl_lock net/core/rtnetlink.c:147 [inline]
 rtnl_dumpit+0x1bd/0x300 net/core/rtnetlink.c:6585
 kthread+0x2f0/0x390 kernel/kthread.c:389
 netlink_dump+0x647/0xd80 net/netlink/af_netlink.c:2325
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/R-dm_bu state:I stack:29696 pid:2305  tgid:2305  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 netlink_recvmsg+0x6bb/0x11d0 net/netlink/af_netlink.c:1983
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg+0x22f/0x280 net/socket.c:1068
 ____sys_recvmsg+0x1db/0x470 net/socket.c:2816
 ___sys_recvmsg net/socket.c:2858 [inline]
 __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
task:kworker/R-kmpat state:I
RIP: 0033:0x7fc33bbcd91e
 stack:29696 pid:2306  tgid:2306  ppid:2      flags:0x00004000
RSP: 002b:00007ffc330c1858 EFLAGS: 00000246
Call Trace:
 ORIG_RAX: 000000000000002f
 <TASK>
RAX: ffffffffffffffda RBX: 00007ffc330c2980 RCX: 00007fc33bbcd91e
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
RDX: 0000000000000000 RSI: 00007ffc330c28a0 RDI: 0000000000000008
RBP: 00007ffc330c2910 R08: 0000000000000000 R09: 0000000000040000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000ef0
R13: 00007ffc330c2884 R14: 00007ffc330c28a0 R15: 00007ffc330c2890
 </TASK>
DEBUG: waiting rtnl_mutex for 3471 jiffies.
task:syz-executor.0  state:D
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 stack:19824 pid:5747  tgid:5747  ppid:1      flags:0x00000006
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 kthread+0x2f0/0x390 kernel/kthread.c:389
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 </TASK>
task:kworker/R-kmpat state:I
 stack:29696 pid:2307  tgid:2307  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:kworker/R-kvub3 state:I
 stack:29696 pid:2326  tgid:2326  ppid:2      flags:0x00004000
Call Trace:
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
task:kworker/R-kvub3 state:I stack:29696 pid:2327  tgid:2327  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __do_sys_sendto net/socket.c:2216 [inline]
 __se_sys_sendto net/socket.c:2212 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2212
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09d967ed9c
RSP: 002b:00007fffabc51170 EFLAGS: 00000293
 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f09da2e4620 RCX: 00007f09d967ed9c
RDX: 0000000000000040 RSI: 00007f09da2e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fffabc511c4 R09: 000000000000000c
 kthread+0x2f0/0x390 kernel/kthread.c:389
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f09da2e4670 R15: 0000000000000000
 </TASK>
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
DEBUG: waiting rtnl_mutex for 3526 jiffies.
task:kworker/0:10    state:D
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 stack:25360 pid:5671  tgid:5671  ppid:2      flags:0x00004000
 </TASK>
Workqueue: events linkwatch_event
task:kworker/R-kvub3 state:I

 stack:29696 pid:2328  tgid:2328  ppid:2      flags:0x00004000
Call Trace:
Call Trace:
 <TASK>
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 linkwatch_event+0xe/0x60 net/core/link_watch.c:276
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 process_one_work kernel/workqueue.c:3224 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305
 </TASK>
task:kworker/R-kmems state:I
 stack:29696 pid:2332  tgid:2332  ppid:2      flags:0x00004000
Call Trace:
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3385
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 kthread+0x2f0/0x390 kernel/kthread.c:389
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 kthread+0x2f0/0x390 kernel/kthread.c:389
 </TASK>

Showing all locks held in the system:
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
6 locks held by kworker/1:0/25:
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 #0: 
task:kworker/R-rdma_ state:I stack:29696 pid:2336  tgid:2336  ppid:2      flags:0x00004000
ffff88801b6d8548
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 (
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3199 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 #1: 
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
ffffc900001f7d00
 ((work_completion)(&hub->events)
){+.+.}-{0:0}
 kthread+0x2f0/0x390 kernel/kthread.c:389
, at: process_one_work kernel/workqueue.c:3200 [inline]
, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
 #2: 
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
ffff8880236a1190
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
 (&dev->mutex
task:kworker/R-mlx4_ state:I stack:29264 pid:2340  tgid:2340  ppid:2      flags:0x00004000
Call Trace:
){....}-{3:3}
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
, at: device_lock include/linux/device.h:1009 [inline]
, at: hub_event+0x1fe/0x5150 drivers/usb/core/hub.c:5849
 #3: 
ffff8880236a4518
 (
&port_dev->status_lock
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
){+.+.}-{3:3}
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
, at: usb_lock_port drivers/usb/core/hub.c:3206 [inline]
, at: hub_port_connect drivers/usb/core/hub.c:5418 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
, at: port_event drivers/usb/core/hub.c:5821 [inline]
, at: hub_event+0x25b6/0x5150 drivers/usb/core/hub.c:5903
 #4: 
ffff88802303cb68
 (
hcd->address0_mutex
){+.+.}-{3:3}
, at: hub_port_connect drivers/usb/core/hub.c:5419 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
, at: port_event drivers/usb/core/hub.c:5821 [inline]
, at: hub_event+0x25f4/0x5150 drivers/usb/core/hub.c:5903
 kthread+0x2f0/0x390 kernel/kthread.c:389
 #5: 
ffffffff8ef2e3b0
 (
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
ehci_cf_port_reset_rwsem
){.+.+}-{3:3}
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
, at: hub_port_reset+0x1f8/0x1b30 drivers/usb/core/hub.c:3021
 </TASK>
task:kworker/R-mlx4_ state:I
3 locks held by kworker/u8:2/35:
 stack:29696 pid:2341  tgid:2341  ppid:2      flags:0x00004000
 #0: 
Call Trace:
ffff88802a278948
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 (
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3199 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 #1: 
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
ffffc90000ab7d00
 rescuer_thread+0xc46/0xda0 kernel/workqueue.c:3535
 (
(work_completion)(&(&ifa->dad_work)->work)
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3200 [inline]
, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
 #2: 
 kthread+0x2f0/0x390 kernel/kthread.c:389
ffffffff8f5f7d08
 (
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
rtnl_mutex
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
){+.+.}-{3:3}
task:kworker/R-srp_r state:I stack:29696 pid:2343  tgid:2343  ppid:2      flags:0x00004000
, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
2 locks held by dhcpcd/4760: