INFO: task syz.2.228:4464 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.2.228 state:D stack:0 pid:4464 tgid:4460 ppid:4253 task_flags:0x40044c flags:0x00000018 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+0x23c/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_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 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: ffff800087876d18 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 1 lock held by klogd/3120: #0: fff0000072d78d18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:636 [inline] #0: fff0000072d78d18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1519 [inline] #0: fff0000072d78d18 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1841 [inline] #0: fff0000072d78d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6865 1 lock held by dhcpcd/3157: 2 locks held by getty/3185: #0: 3cf0000011c4e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 79ff80008c5cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/3315: 3 locks held by kworker/u4:6/3369: 3 locks held by kworker/u4:8/4334: #0: 70f0000011b2d148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff8000abd77c78 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 #2: ffff800087b92fc0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by syz.3.227/4456: 3 locks held by syz-executor/4480: #0: ffff800087b92fc0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffff800087b92fc0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffff800087b92fc0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x80c/0x1878 net/core/rtnetlink.c:4056 #1: 19f0000018d4f4e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x270/0x4b8 drivers/net/wireguard/device.c:50 #2: ffff8000878780f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #2: ffff8000878780f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f8/0x548 kernel/rcu/tree_exp.h:957 1 lock held by syz-executor/4491: #0: ffff800087b92fc0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u4:11/4620: 3 locks held by kworker/u4:12/4638: ============================================= INFO: task syz.2.228:4464 blocked for more than 451 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.228 state:D stack:0 pid:4464 tgid:4460 ppid:4253 task_flags:0x40044c flags:0x00000018 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+0x23c/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_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 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: ffff800087876d18 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 1 lock held by syslogd/3116: 1 lock held by klogd/3120: 2 locks held by getty/3185: #0: 3cf0000011c4e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 79ff80008c5cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by kworker/u4:2/4063: 2 locks held by syz.3.227/4456: 3 locks held by kworker/u4:4/4605: =============================================