INFO: task syz-executor.1:3073 blocked for more than 143 seconds. Not tainted 5.4.0-rc6+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29152 3073 1740 0x80004004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1174 close_files fs/file.c:388 [inline] put_files_struct fs/file.c:416 [inline] put_files_struct+0x1d8/0x2e0 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0x891/0x2c00 kernel/exit.c:812 do_group_exit+0x125/0x340 kernel/exit.c:921 get_signal+0x466/0x23d0 kernel/signal.c:2734 do_signal+0x88/0x14e0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413fb1 Code: 48 8b 44 24 30 48 85 c0 74 4a 48 8b 44 24 50 48 89 04 24 48 8b 44 24 58 48 89 44 24 08 8b 44 24 60 89 44 24 10 8b 44 24 64 83 10 89 44 24 14 8b 44 24 68 89 44 24 18 8b 44 24 6c 89 44 24 1c RSP: 002b:00007fe6efd5d7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000003 RCX: 0000000000413fb1 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fe6efd5d7d0 RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000293 R12: 00007fe6efd5e6d4 R13: 00000000004c9c9c R14: 00000000004e19e0 R15: 00000000ffffffff INFO: task syz-executor.2:3071 blocked for more than 143 seconds. Not tainted 5.4.0-rc6+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28520 3071 1741 0x80004006 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1174 close_files fs/file.c:388 [inline] put_files_struct fs/file.c:416 [inline] put_files_struct+0x1d8/0x2e0 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0x891/0x2c00 kernel/exit.c:812 do_group_exit+0x125/0x340 kernel/exit.c:921 get_signal+0x466/0x23d0 kernel/signal.c:2734 do_signal+0x88/0x14e0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4586e1 Code: Bad RIP value. RSP: 002b:00007ffcaf3c4670 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: fffffffffffffdfc RBX: 000000000014a4e3 RCX: 00000000004586e1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffcaf3c4680 RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffcaf3c4770 R11: 0000000000000293 R12: 000000000075bf20 R13: 000000000075c9a0 R14: 00000000007601b0 R15: 000000000075bf2c INFO: task syz-executor.0:3074 blocked for more than 143 seconds. Not tainted 5.4.0-rc6+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27144 3074 1747 0x80004000 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1174 close_files fs/file.c:388 [inline] put_files_struct fs/file.c:416 [inline] put_files_struct+0x1d8/0x2e0 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0x891/0x2c00 kernel/exit.c:812 do_group_exit+0x125/0x340 kernel/exit.c:921 get_signal+0x466/0x23d0 kernel/signal.c:2734 do_signal+0x88/0x14e0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413fb1 Code: 1c ba 44 00 e8 a0 d0 00 00 b8 2e f8 ff ff 48 83 c4 08 c3 66 0f 1f 44 00 00 48 85 ff 74 10 48 83 ec 08 e8 d2 6f ff ff 31 c0 48 <83> c4 08 c3 31 c0 c3 0f 1f 84 00 00 00 00 00 48 89 5c 24 d8 48 89 RSP: 002b:00007ff9ba0127a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000413fb1 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ff9ba0127d0 RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000293 R12: 00007ff9ba0136d4 R13: 00000000004c9c9c R14: 00000000004e19e0 R15: 00000000ffffffff INFO: task syz-executor.5:3076 blocked for more than 144 seconds. Not tainted 5.4.0-rc6+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28520 3076 1748 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1174 __close_fd+0x133/0x200 fs/file.c:636 __do_sys_close fs/open.c:1193 [inline] __se_sys_close fs/open.c:1191 [inline] __x64_sys_close+0x69/0x100 fs/open.c:1191 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413db1 Code: c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31 c0 c3 0f 1f 80 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 b8 <2d> f8 ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 RSP: 002b:00007ffcf65b5c60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000413db1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffcf65b5d40 R11: 0000000000000293 R12: 000000000075bf20 R13: 0000000000149bf3 R14: 00000000007601b0 R15: 000000000075bf2c INFO: task syz-executor.4:3079 blocked for more than 144 seconds. Not tainted 5.4.0-rc6+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28520 3079 1744 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1174 __close_fd+0x133/0x200 fs/file.c:636 __do_sys_close fs/open.c:1193 [inline] __se_sys_close fs/open.c:1191 [inline] __x64_sys_close+0x69/0x100 fs/open.c:1191 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413db1 Code: c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31 c0 c3 0f 1f 80 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 b8 <2d> f8 ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 RSP: 002b:00007ffea5ad3160 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000413db1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffea5ad3240 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 00000000007601b0 R15: 000000000075bfd4 INFO: task syz-executor.3:3082 blocked for more than 144 seconds. Not tainted 5.4.0-rc6+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28520 3082 1745 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1174 __close_fd+0x133/0x200 fs/file.c:636 __do_sys_close fs/open.c:1193 [inline] __se_sys_close fs/open.c:1191 [inline] __x64_sys_close+0x69/0x100 fs/open.c:1191 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413db1 Code: c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31 c0 c3 0f 1f 80 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 b8 <2d> f8 ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 RSP: 002b:00007ffcbbd426c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000413db1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffcbbd427a0 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 00000000007601b0 R15: 000000000075bfd4 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: ffffffff86cfe8a0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335 1 lock held by rsyslogd/1599: #0: ffff8881d37c2d60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1689: #0: ffff8881d1854090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004892e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1690: #0: ffff8881d1aea090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc9000049b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1691: #0: ffff8881d1855090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004912e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1692: #0: ffff8881d1aeb090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004a72e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1693: #0: ffff8881d14cd090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004af2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1694: #0: ffff8881d19bf090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004a32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1695: #0: ffff8881d2c78090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc9000047d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.4.0-rc6+ #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+0xca/0x13e lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9a4/0xe50 kernel/hung_task.c:289 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0x28/0x2e0 arch/x86/kernel/process.c:580