INFO: task syz-executor193:1725 blocked for more than 143 seconds. Not tainted 5.3.0-rc5+ #27 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor193 D28272 1725 1723 0x80004006 Call Trace: schedule+0x9a/0x250 kernel/sched/core.c:3944 wdm_flush+0x20c/0x370 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:2729 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:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x401540 Code: 00 00 05 00 00 00 67 00 00 00 00 00 00 00 00 00 00 00 a8 88 60 00 00 00 00 00 05 00 00 00 6c 00 00 00 00 00 00 00 00 00 00 00 88 60 00 00 00 00 00 05 00 00 00 6d 00 00 00 00 00 00 00 00 00 RSP: 002b:00007ffdb922ad68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000401540 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffdb922ad80 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000402560 R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor193:1730 blocked for more than 143 seconds. Not tainted 5.3.0-rc5+ #27 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor193 D28520 1730 1729 0x80004006 Call Trace: schedule+0x9a/0x250 kernel/sched/core.c:3944 wdm_flush+0x20c/0x370 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:2729 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:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441809 Code: 0a 53 75 67 67 65 73 74 65 64 20 61 63 74 69 6f 6e 3a 20 72 75 6e 20 72 73 79 73 6c 6f 67 64 20 77 69 74 68 20 2d 64 20 2d 6e <20> 6f 70 74 69 6f 6e 73 20 74 6f 20 73 65 65 20 77 68 61 74 20 65 RSP: 002b:00007ffdb922ae18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000441809 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402560 R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor193:1731 blocked for more than 143 seconds. Not tainted 5.3.0-rc5+ #27 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor193 D28376 1731 1727 0x80000002 Call Trace: schedule+0x9a/0x250 kernel/sched/core.c:3944 wdm_flush+0x20c/0x370 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:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440458 Code: 3e 5d 0a 54 6f 20 72 75 6e 20 72 73 79 73 6c 6f 67 64 20 69 6e 20 6e 61 74 69 76 65 20 6d 6f 64 65 2c 20 75 73 65 20 22 72 73 <79> 73 6c 6f 67 64 20 2d 63 35 20 3c 6f 74 68 65 72 20 6f 70 74 69 RSP: 002b:00007ffdb922add8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440458 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004c00d0 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor193:1732 blocked for more than 144 seconds. Not tainted 5.3.0-rc5+ #27 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor193 D28520 1732 1724 0x80004006 Call Trace: schedule+0x9a/0x250 kernel/sched/core.c:3944 wdm_flush+0x20c/0x370 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:2729 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:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441809 Code: 0a 53 75 67 67 65 73 74 65 64 20 61 63 74 69 6f 6e 3a 20 72 75 6e 20 72 73 79 73 6c 6f 67 64 20 77 69 74 68 20 2d 64 20 2d 6e <20> 6f 70 74 69 6f 6e 73 20 74 6f 20 73 65 65 20 77 68 61 74 20 65 RSP: 002b:00007ffdb922ae18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000441809 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402560 R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor193:1733 blocked for more than 144 seconds. Not tainted 5.3.0-rc5+ #27 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor193 D28248 1733 1728 0x80004006 Call Trace: schedule+0x9a/0x250 kernel/sched/core.c:3944 wdm_flush+0x20c/0x370 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:2729 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:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x401540 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 01 00 00 00 00 00 00 28 01 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 3b 01 00 00 00 00 00 00 00 00 RSP: 002b:00007ffdb922ad68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000401540 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffdb922ad80 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000402560 R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor193:1735 blocked for more than 144 seconds. Not tainted 5.3.0-rc5+ #27 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor193 D28520 1735 1726 0x80004006 Call Trace: schedule+0x9a/0x250 kernel/sched/core.c:3944 wdm_flush+0x20c/0x370 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:2729 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:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441809 Code: 0a 53 75 67 67 65 73 74 65 64 20 61 63 74 69 6f 6e 3a 20 72 75 6e 20 72 73 79 73 6c 6f 67 64 20 77 69 74 68 20 2d 64 20 2d 6e <20> 6f 70 74 69 6f 6e 73 20 74 6f 20 73 65 65 20 77 68 61 74 20 65 RSP: 002b:00007ffdb922ae18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000441809 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402560 R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: 000000003d417057 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5254 1 lock held by rsyslogd/1598: #0: 00000000cc6bf080 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1688: #0: 00000000a76be0e8 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000c85e003f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1689: #0: 00000000d96395d6 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000006bbb4516 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1690: #0: 000000001f563b2d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000000c97e07f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1691: #0: 0000000058a8e862 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000d94b7684 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1692: #0: 00000000308b86e1 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000c21e838b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1693: #0: 00000000b650a3fd (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000f7ab1253 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1694: #0: 00000000b5228d43 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000049af1d5f (&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 5.3.0-rc5+ #27 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