INFO: task syz.8.25:5469 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.25 state:D stack:0 pid:5469 ppid:5446 flags:0x00000001 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6697 __mutex_lock_common+0xafc/0x1f60 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 __do_sys_acct kernel/acct.c:327 [inline] __se_sys_acct kernel/acct.c:315 [inline] __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015417df0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff800015418610 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 3 locks held by kworker/0:1/14: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b8/0x13a4 kernel/workqueue.c:2265 #1: ffff80001ca47c20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6fc/0x13a4 kernel/workqueue.c:2267 #2: ffff0000dc785240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1d0/0x27cc drivers/net/netdevsim/fib.c:1491 1 lock held by khungtaskd/28: #0: ffff800015417480 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by getty/4083: #0: ffff0000d8c28098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000208fe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xfa0 drivers/tty/n_tty.c:2198 2 locks held by syz.7.24/5310: 1 lock held by syz.8.25/5469: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.9.26/5628: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.0.27/5895: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.1.28/6355: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.2.29/6846: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.3.30/7289: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.4.31/7823: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.5.32/8269: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 1 lock held by syz.6.33/8792: #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:327 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:315 [inline] #0: ffff80001543ba08 (acct_on_mutex){+.+.}-{3:3}, at: __arm64_sys_acct+0xcc/0x714 kernel/acct.c:315 3 locks held by dhcpcd-run-hook/8984: =============================================