INFO: task syz-executor907:1727 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor907 D28520 1727 1725 0x80004006 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4123 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1166 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+0x8bc/0x2c00 kernel/exit.c:874 do_group_exit+0x125/0x340 kernel/exit.c:983 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: 0033:0x4015b0 Code: 00 00 48 82 60 00 00 00 00 00 07 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 50 82 60 00 00 00 00 00 07 00 00 00 03 00 00 00 <00> 00 00 00 00 00 00 00 58 82 60 00 00 00 00 00 07 00 00 00 04 00 RSP: 002b:00007ffd786823c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 00000000004015b0 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd786823e0 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 00000000004025d0 R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor907:1732 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor907 D28304 1732 1731 0x80000002 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4123 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1166 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+0x8bc/0x2c00 kernel/exit.c:874 do_group_exit+0x125/0x340 kernel/exit.c:983 __do_sys_exit_group kernel/exit.c:994 [inline] __se_sys_exit_group kernel/exit.c:992 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:992 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4404c8 Code: 79 73 6c 6f 67 2e 63 6f 6d 2f 64 6f 63 0a 00 00 00 00 6d 73 67 43 6f 6e 73 75 6d 65 72 3a 20 55 44 50 20 41 43 4c 20 6d 75 73 <74> 20 62 65 20 63 68 65 63 6b 65 64 20 66 6f 72 20 6d 65 73 73 61 RSP: 002b:00007ffd78682438 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004404c8 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004c0010 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor907:1733 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor907 D28520 1733 1729 0x80004006 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4123 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1166 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+0x8bc/0x2c00 kernel/exit.c:874 do_group_exit+0x125/0x340 kernel/exit.c:983 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: 0033:0x4015b0 Code: 00 00 0c 50 40 f0 04 29 84 04 20 12 28 ce 01 80 80 10 cc 58 94 a8 60 5f 0d 01 01 5f cb 99 89 00 00 d6 a9 0c 01 00 60 21 1a 80 <00> 80 00 10 04 08 c0 00 20 00 08 a0 08 13 47 20 8c 08 80 29 02 04 RSP: 002b:00007ffd786823c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 00000000004015b0 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd786823e0 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 00000000004025d0 R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor907:1734 blocked for more than 144 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor907 D28168 1734 1726 0x80004006 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4123 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1166 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+0x8bc/0x2c00 kernel/exit.c:874 do_group_exit+0x125/0x340 kernel/exit.c:983 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: 0033:0x4015b0 Code: 00 00 0c 50 40 f0 04 29 84 04 20 12 28 ce 01 80 80 10 cc 58 94 a8 60 5f 0d 01 01 5f cb 99 89 00 00 d6 a9 0c 01 00 60 21 1a 80 <00> 80 00 10 04 08 c0 00 20 00 08 a0 08 13 47 20 8c 08 80 29 02 04 RSP: 002b:00007ffd786823c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 00000000004015b0 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd786823e0 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 00000000004025d0 R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor907:1735 blocked for more than 144 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor907 D28520 1735 1730 0x80004006 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4123 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1166 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+0x8bc/0x2c00 kernel/exit.c:874 do_group_exit+0x125/0x340 kernel/exit.c:983 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: 0033:0x4015b0 Code: 00 00 0c 50 40 f0 04 29 84 04 20 12 28 ce 01 80 80 10 cc 58 94 a8 60 5f 0d 01 01 5f cb 99 89 00 00 d6 a9 0c 01 00 60 21 1a 80 <00> 80 00 10 04 08 c0 00 20 00 08 a0 08 13 47 20 8c 08 80 29 02 04 RSP: 002b:00007ffd786823c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 00000000004015b0 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd786823e0 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 00000000004025d0 R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor907:1736 blocked for more than 144 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor907 D28520 1736 1728 0x80004006 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4123 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x160 fs/open.c:1166 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+0x8bc/0x2c00 kernel/exit.c:874 do_group_exit+0x125/0x340 kernel/exit.c:983 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: 0033:0x441879 Code: 7a 65 20 65 72 72 62 75 66 20 6f 62 6a 65 63 74 20 28 65 72 72 6f 72 20 63 6f 64 65 20 25 64 29 2e 0a 00 00 00 00 00 00 00 6d <61> 69 6e 6d 73 67 71 75 65 75 65 63 68 65 63 6b 70 6f 69 6e 74 69 RSP: 002b:00007ffd78682478 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000441879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 000000000000000f R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004025d0 R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: ffffffff86cff360 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335 1 lock held by rsyslogd/1602: #0: ffff8881d63d4fe0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1692: #0: ffff8881d9798090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004752e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1693: #0: ffff8881d909f790 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004852e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1694: #0: ffff8881d90de690 (&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 2 locks held by getty/1695: #0: ffff8881d9125590 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004712e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1696: #0: ffff8881d90dd590 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004812e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1697: #0: ffff8881d913ef10 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1698: #0: ffff8881d979c490 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc9000044d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.3.0+ #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 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0x28/0x2e0 arch/x86/kernel/process.c:580