INFO: task kworker/u4:6:1037 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:6    state:D stack:24104 pid:1037  tgid:1037  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x805/0x10c0 kernel/locking/mutex.c:746
 rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 addrconf_dad_work+0x110/0x16a0 net/ipv6/addrconf.c:4195
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 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>
INFO: task syz-executor245:5337 blocked for more than 148 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor245 state:D stack:20456 pid:5337  tgid:5337  ppid:5334   task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x805/0x10c0 kernel/locking/mutex.c:746
 cgrp_css_online+0x90/0x2f0 net/core/netprio_cgroup.c:157
 online_css+0xbb/0x2e0 kernel/cgroup/cgroup.c:5607
 css_create kernel/cgroup/cgroup.c:5691 [inline]
 cgroup_apply_control_enable+0x7d7/0xaf0 kernel/cgroup/cgroup.c:3282
 cgroup_mkdir+0xa6f/0xc30 kernel/cgroup/cgroup.c:5886
 kernfs_iop_mkdir+0x22a/0x370 fs/kernfs/dir.c:1266
 vfs_mkdir+0x2f9/0x500 fs/namei.c:4359
 do_mkdirat+0x273/0x3f0 fs/namei.c:4392
 __do_sys_mkdir fs/namei.c:4414 [inline]
 __se_sys_mkdir fs/namei.c:4412 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4412
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde1ba87917
RSP: 002b:00007ffc0a2e7498 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fde1bad840c RCX: 00007fde1ba87917
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffc0a2e7510
RBP: 0000000000000001 R08: 0000000000000013 R09: 00007ffc0a2e71e7
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fde1bad8036
R13: 00007ffc0a2e7510 R14: 00007fde1bad8533 R15: 00007ffc0a2e7550