INFO: task syz.8.372:8802 blocked for more than 430 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.372       state:D stack:0     pid:8802  tgid:8796  ppid:8511   task_flags:0x40054c flags:0x00000019
Call trace:
 __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T)
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1eec/0x33a4 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xac/0x27c kernel/sched/core.c:7058
 schedule_timeout+0x5c/0x1e4 kernel/time/sleep_timeout.c:75
 do_wait_for_common+0x28c/0x444 kernel/sched/completion.c:100
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x44/0x5c kernel/sched/completion.c:153
 __synchronize_srcu+0x2a4/0x320 kernel/rcu/srcutree.c:1444
 synchronize_srcu+0x3cc/0x4f0 kernel/rcu/srcutree.c:-1
 mn_hlist_release mm/mmu_notifier.c:347 [inline]
 __mmu_notifier_release+0x424/0x614 mm/mmu_notifier.c:359
 mmu_notifier_release include/linux/mmu_notifier.h:402 [inline]
 exit_mmap+0xb8/0xbb8 mm/mmap.c:1263
 __mmput+0x10c/0x528 kernel/fork.c:1130
 mmput+0x70/0xac kernel/fork.c:1152
 exit_mm+0x158/0x258 kernel/exit.c:582
 do_exit+0x788/0x2378 kernel/exit.c:949
 do_group_exit+0x1d4/0x2ac kernel/exit.c:1102
 get_signal+0x1440/0x1554 kernel/signal.c:3034
 do_signal+0x180/0x4dd0 arch/arm64/kernel/signal.c:1618
 do_notify_resume+0xb0/0x270 arch/arm64/kernel/entry-common.c:152
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline]
 el0_da+0xc4/0x148 arch/arm64/kernel/entry-common.c:698
 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffff800087806858 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
2 locks held by getty/3178:
 #0: c1f0000011d0a8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: 56ff80008c54b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222
3 locks held by kworker/u4:8/7445:
3 locks held by kworker/u4:1/8222:
3 locks held by kworker/u4:2/8258:
3 locks held by kworker/u4:3/8298:
 #0: 31f0000011af0d48 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210
 #1: ffff80008e7a7c78 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210
 #2: ffff800087b17900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
2 locks held by syz.4.371/8795:
2 locks held by syz-executor/8824:
1 lock held by syz-executor/8827:
 #0: ffff800087b17900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #0: ffff800087b17900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
 #0: ffff800087b17900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x80c/0x1878 net/core/rtnetlink.c:4056
3 locks held by kworker/u4:5/8938:
3 locks held by kworker/u4:9/8952:
1 lock held by rm/9043:

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