INFO: task syz-executor.4:12008 blocked for more than 143 seconds. Not tainted 5.10.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:25896 pid:12008 ppid: 8503 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4523 schedule+0xcf/0x270 kernel/sched/core.c:4601 schedule_timeout+0x148/0x250 kernel/time/timer.c:1876 gfs2_gl_hash_clear+0x240/0x270 fs/gfs2/glock.c:1989 gfs2_fill_super+0x1e81/0x23f0 fs/gfs2/ops_fstype.c:1233 get_tree_bdev+0x421/0x740 fs/super.c:1344 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1256 vfs_get_tree+0x89/0x2f0 fs/super.c:1549 do_new_mount fs/namespace.c:2875 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3205 do_mount fs/namespace.c:3218 [inline] __do_sys_mount fs/namespace.c:3426 [inline] __se_sys_mount fs/namespace.c:3403 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3403 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x46090a Code: Unable to access opcode bytes at RIP 0x4608e0. RSP: 002b:00007f714d6cba88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f714d6cbb20 RCX: 000000000046090a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f714d6cbae0 RBP: 00007f714d6cbae0 R08: 00007f714d6cbb20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x789/0xe50 kernel/sched/fair.c:10576 #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x430 kernel/sched/fair.c:6018 1 lock held by khungtaskd/1645: #0: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 2 locks held by in:imklog/8147: #0: ffff8880188d9db0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: ttwu_queue kernel/sched/core.c:2694 [inline] #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: try_to_wake_up+0x535/0x1300 kernel/sched/core.c:2974 2 locks held by agetty/8404: #0: ffff888029c2b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc900010002e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a20 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/12008: #0: ffff888019dce0e0 (&type->s_umount_key#73/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0xa80 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1645 Comm: khungtaskd Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 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:209 [inline] watchdog+0xd43/0xfa0 kernel/hung_task.c:295 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9788 Comm: kworker/0:4 Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:check_wait_context kernel/locking/lockdep.c:4538 [inline] RIP: 0010:__lock_acquire+0x673/0x5590 kernel/locking/lockdep.c:4787 Code: 9a bb 8e 48 8d b8 b8 00 00 00 48 89 fa 48 c1 ea 03 42 0f b6 14 32 84 d2 74 09 80 fa 01 0f 8e af 2c 00 00 0f b7 80 b8 00 00 00 <66> 85 c0 74 08 66 41 39 c5 44 0f 4f e8 48 8b 04 24 83 c3 01 48 c1 RSP: 0018:ffffc900157df8d8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8155c4e7 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ebc25f8 RBP: 00000000000000b9 R08: 0000000000000000 R09: ffffffff8ebb9677 R10: fffffbfff1d772ce R11: 0000000000000000 R12: ffff888063e46200 R13: 0000000000000004 R14: dffffc0000000000 R15: ffff888063e46b10 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faf28606000 CR3: 0000000013d8d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1af/0x8b0 kernel/locking/lockdep.c:5407 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 _extract_crng+0xd2/0x250 drivers/char/random.c:1007 extract_crng drivers/char/random.c:1026 [inline] _get_random_bytes+0x229/0x670 drivers/char/random.c:1562 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:512 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:562 [inline] nsim_dev_trap_report_work+0x34c/0xbd0 drivers/net/netdevsim/dev.c:603 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296