INFO: task syz-executor121:1726 blocked for more than 143 seconds. Not tainted 5.3.0-rc2+ #25 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor121 D28520 1726 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/0x2c50 kernel/exit.c:873 do_group_exit+0x125/0x340 kernel/exit.c:982 get_signal+0x466/0x23d0 kernel/signal.c:2728 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: 0033:0x401520 Code: 6e 65 54 61 62 6c 65 00 67 65 74 63 6f 6e 00 5f 69 6e 69 74 00 69 73 5f 73 65 6c 69 6e 75 78 5f 65 6e 61 62 6c 65 64 00 73 65 <63> 75 72 69 74 79 5f 67 65 74 65 6e 66 6f 72 63 65 00 67 65 74 5f RSP: 002b:00007ffd59c75df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000401520 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd59c75e10 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000402540 R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor121:1731 blocked for more than 143 seconds. Not tainted 5.3.0-rc2+ #25 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor121 D28520 1731 1730 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/0x2c50 kernel/exit.c:873 do_group_exit+0x125/0x340 kernel/exit.c:982 get_signal+0x466/0x23d0 kernel/signal.c:2728 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: 0033:0x4417e9 Code: 65 64 2e 0a 44 69 64 20 79 6f 75 20 64 6f 20 61 20 22 6d 61 6b 65 20 69 6e 73 74 61 6c 6c 22 3f 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 RSP: 002b:00007ffd59c75ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004417e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 000000000000000f R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402540 R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor121:1732 blocked for more than 143 seconds. Not tainted 5.3.0-rc2+ #25 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor121 D28520 1732 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/0x2c50 kernel/exit.c:873 do_group_exit+0x125/0x340 kernel/exit.c:982 get_signal+0x466/0x23d0 kernel/signal.c:2728 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: 0033:0x401520 Code: 00 00 3d 02 00 00 46 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 10 01 00 00 2f 01 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 00 00 00 00 20 01 00 00 00 00 RSP: 002b:00007ffd59c75df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000401520 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd59c75e10 RBP: 00000000006cc018 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000402540 R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor121:1733 blocked for more than 144 seconds. Not tainted 5.3.0-rc2+ #25 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor121 D28376 1733 1725 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/0x2c50 kernel/exit.c:873 do_group_exit+0x125/0x340 kernel/exit.c:982 __do_sys_exit_group kernel/exit.c:993 [inline] __se_sys_exit_group kernel/exit.c:991 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:991 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440438 Code: 61 74 68 3e 5d 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 5b 2d 75 3c 6e 75 6d 62 65 72 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 RSP: 002b:00007ffd59c75e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440438 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004bff70 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor121:1734 blocked for more than 144 seconds. Not tainted 5.3.0-rc2+ #25 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor121 D28248 1734 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/0x2c50 kernel/exit.c:873 do_group_exit+0x125/0x340 kernel/exit.c:982 get_signal+0x466/0x23d0 kernel/signal.c:2728 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: 0033:0x4417e9 Code: 65 64 2e 0a 44 69 64 20 79 6f 75 20 64 6f 20 61 20 22 6d 61 6b 65 20 69 6e 73 74 61 6c 6c 22 3f 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 RSP: 002b:00007ffd59c75ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004417e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 000000000000000f R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402540 R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor121:1736 blocked for more than 144 seconds. Not tainted 5.3.0-rc2+ #25 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor121 D28520 1736 1727 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/0x2c50 kernel/exit.c:873 do_group_exit+0x125/0x340 kernel/exit.c:982 get_signal+0x466/0x23d0 kernel/signal.c:2728 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: 0033:0x4417e9 Code: 65 64 2e 0a 44 69 64 20 79 6f 75 20 64 6f 20 61 20 22 6d 61 6b 65 20 69 6e 73 74 61 6c 6c 22 3f 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 RSP: 002b:00007ffd59c75ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004417e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 000000000000000f R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402540 R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: 00000000743497a3 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5254 1 lock held by rsyslogd/1602: #0: 00000000988125b0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1693: #0: 0000000047c29258 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000527dfb3a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1694: #0: 000000003a351c46 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000d8d75c5b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1695: #0: 00000000e15b15bf (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000004d294c18 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1696: #0: 0000000051d028a3 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000038c23150 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1697: #0: 000000001b33f7ab (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000f5955915 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1698: #0: 000000007ef217e0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000bc876517 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1699: #0: 000000000ee3efd4 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000006bc64f89 (&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-rc2+ #25 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