INFO: task syz-executor.5:10341 blocked for more than 143 seconds. Not tainted 5.17.0-rc1-syzkaller-00186-g23a46422c561 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26424 pid:10341 ppid: 9968 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4db0 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6427 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x1240 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x1c9e/0x2940 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1c60564f74 RSP: 002b:00007f1c5ef05ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f1c606c5030 RCX: 00007f1c60564f74 RDX: 0000000000000002 RSI: 00007f1c5ef05d40 RDI: 00000000ffffff9c RBP: 00007f1c5ef05d40 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007f1c60bf8b1f R14: 00007f1c5ef06300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb83ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 4 locks held by klogd/2959: #0: ffff8880b9c39c58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489 #1: ffff8880b9c27948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3e7/0x4e0 kernel/sched/psi.c:891 #2: ffff88807e1ce098 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xab/0x1510 kernel/sched/core.c:4017 #3: ffff8880b9c39c58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489 2 locks held by getty/3290: #0: ffff888022c25098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b632e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077 2 locks held by kworker/u4:14/7185: #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:631 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:658 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x890/0x1650 kernel/workqueue.c:2278 #1: ffffc90004b7fdb8 ((kfence_timer).work){+.+.}-{0:0}, at: process_one_work+0x8c4/0x1650 kernel/workqueue.c:2282 2 locks held by kworker/u4:16/7189: 2 locks held by syz-executor.4/10339: 1 lock held by syz-executor.5/10341: #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 1 lock held by syz-executor.0/10381: #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5be868 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.17.0-rc1-syzkaller-00186-g23a46422c561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9620 Comm: kworker/0:6 Not tainted 5.17.0-rc1-syzkaller-00186-g23a46422c561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:debug_smp_processor_id+0x13/0x20 lib/smp_processor_id.c:60 Code: 28 48 c7 c7 e0 19 06 8a e8 15 1f bc ff e8 3e d5 cb ff eb a2 0f 1f 00 0f 1f 44 00 00 48 c7 c6 20 1a 06 8a 48 c7 c7 60 1a 06 8a 78 fe ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 0f 1f 44 00 00 RSP: 0018:ffffc90002cefa10 EFLAGS: 00000082 RAX: 0000000000000001 RBX: 1ffff9200059df4a RCX: ffffffff815d49c8 RDX: 0000000000000001 RSI: ffffffff8a061a20 RDI: ffffffff8a061a60 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d94c6d7 R10: fffffbfff1b298da R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888010db3a60 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc184b90680 CR3: 000000007f219000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1176 [inline] rcu_lockdep_current_cpu_online+0x2d/0x150 kernel/rcu/tree.c:1167 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5610 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 _extract_crng+0xcd/0x1b0 drivers/char/random.c:996 extract_crng drivers/char/random.c:1005 [inline] _get_random_bytes+0x219/0x690 drivers/char/random.c:1462 eth_random_addr include/linux/etherdevice.h:232 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:753 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:802 [inline] nsim_dev_trap_report_work+0x378/0xbc0 drivers/net/netdevsim/dev.c:843 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c7 c7 e0 19 06 8a mov $0xffffffff8a0619e0,%rdi 7: e8 15 1f bc ff callq 0xffbc1f21 c: e8 3e d5 cb ff callq 0xffcbd54f 11: eb a2 jmp 0xffffffb5 13: 0f 1f 00 nopl (%rax) 16: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 1b: 48 c7 c6 20 1a 06 8a mov $0xffffffff8a061a20,%rsi 22: 48 c7 c7 60 1a 06 8a mov $0xffffffff8a061a60,%rdi * 29: e9 78 fe ff ff jmpq 0xfffffea6 <-- trapping instruction 2e: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 35: 00 36: 55 push %rbp 37: 48 89 fd mov %rdi,%rbp 3a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)