INFO: task syz-executor.3:21344 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26992 pid:21344 ppid: 8724 flags:0x20024000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 io_uring_cancel_files fs/io_uring.c:8786 [inline] io_uring_cancel_task_requests fs/io_uring.c:8844 [inline] __io_uring_files_cancel+0xc9d/0x14f0 fs/io_uring.c:8941 io_uring_files_cancel include/linux/io_uring.h:51 [inline] exit_files+0xe4/0x170 fs/file.c:431 do_exit+0xb4f/0x2a00 kernel/exit.c:818 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3e9/0x2160 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 __do_fast_syscall_32+0x62/0x80 arch/x86/entry/common.c:138 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f05549 RSP: 002b:00000000f54ff0cc EFLAGS: 00000296 ORIG_RAX: 00000000000001aa RAX: 0000000000000100 RBX: 0000000000000003 RCX: 000000000000450c RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by kworker/u4:6/268: #0: ffff8880b9d34c58 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x7f8/0xea0 kernel/sched/fair.c:10642 #1: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1085 [inline] #1: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x470 kernel/sched/fair.c:6042 1 lock held by khungtaskd/1609: #0: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8168: #0: ffff88801fea3270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:949 2 locks held by agetty/8287: #0: ffff888019a44098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000fb82e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x21d/0x1ac0 drivers/tty/n_tty.c:2158 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1609 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef 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+0xe36/0x10b0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16978 Comm: kworker/1:11 Not tainted 5.10.0-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:chacha_block_generic+0xd6/0x220 lib/crypto/chacha.c:86 Code: 01 00 00 48 89 ea 48 c1 ea 03 42 0f b6 0c 2a 48 89 ea 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 2e 01 00 00 4c 89 e1 8b 55 00 <48> c1 e9 03 42 0f b6 34 29 4c 89 e1 83 e1 07 83 c1 03 40 38 f1 7c RSP: 0018:ffffc90013cefa38 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffc90013cefbbc RCX: ffff8880109a5b14 RDX: 00000000c7b0930e RSI: 0000000000000005 RDI: 0000000000000003 RBP: ffffc90013cefa7c R08: 0000000000000010 R09: 00000000f3960eda R10: ffffffff83c1359c R11: 00000000cb7eaa72 R12: ffff8880109a5b14 R13: dffffc0000000000 R14: 0000000000000005 R15: ffff8880109a5b00 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5572b1d000 CR3: 0000000012b62000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: chacha20_block include/crypto/chacha.h:36 [inline] _extract_crng+0x12f/0x250 drivers/char/random.c:1010 extract_crng drivers/char/random.c:1026 [inline] _get_random_bytes+0x229/0x690 drivers/char/random.c:1562 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:520 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x34c/0xbd0 drivers/net/netdevsim/dev.c:611 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296