INFO: task syz-executor.5:3038 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28560 3038 397 0x80004006 Call Trace: schedule+0xcd/0x2b0 kernel/sched/core.c:4163 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1251 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+0xb36/0x2c80 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x480/0x2480 kernel/signal.c:2739 do_signal+0x88/0x1ae0 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ad51 Code: Bad RIP value. RSP: 002b:00007ffc47b87840 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: 0000000000000000 RBX: 00000000000c75a7 RCX: 000000000045ad51 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffc47b87850 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc47b87950 R11: 0000000000000293 R12: 000000000078bf00 R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c04c INFO: task syz-executor.2:3051 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28560 3051 392 0x80004006 Call Trace: schedule+0xcd/0x2b0 kernel/sched/core.c:4163 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1251 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+0xb36/0x2c80 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x480/0x2480 kernel/signal.c:2739 do_signal+0x88/0x1ae0 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ad51 Code: Bad RIP value. RSP: 002b:00007ffd896e1f10 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: 0000000000000000 RBX: 00000000000c75a7 RCX: 000000000045ad51 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd896e1f20 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffd896e2020 R11: 0000000000000293 R12: 000000000078bf00 R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c04c INFO: task syz-executor.3:3082 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28304 3082 387 0x80004006 Call Trace: schedule+0xcd/0x2b0 kernel/sched/core.c:4163 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1251 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+0xb36/0x2c80 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x480/0x2480 kernel/signal.c:2739 do_signal+0x88/0x1ae0 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x416621 Code: Bad RIP value. RSP: 002b:00007f0a7ad1c7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 0000000000508c20 RCX: 0000000000416621 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f0a7ad1c7d0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c01 R14: 00000000004ce286 R15: 00007f0a7ad1d6d4 INFO: task syz-executor.4:3132 blocked for more than 145 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29048 3132 396 0x80004006 Call Trace: schedule+0xcd/0x2b0 kernel/sched/core.c:4163 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1251 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+0xb36/0x2c80 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x480/0x2480 kernel/signal.c:2739 do_signal+0x88/0x1ae0 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007fba36dd3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: fffffffffffffe00 RBX: 000000000050c8a0 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cf3 R14: 00000000004cf210 R15: 00007fba36dd46d4 INFO: task syz-executor.0:3130 blocked for more than 145 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28904 3130 391 0x80004006 Call Trace: schedule+0xcd/0x2b0 kernel/sched/core.c:4163 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1251 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+0xb36/0x2c80 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x480/0x2480 kernel/signal.c:2739 do_signal+0x88/0x1ae0 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f7048174cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078c048 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078c048 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c R13: 00007ffe5449259f R14: 00007f70481759c0 R15: 000000000078c04c INFO: task syz-executor.1:3100 blocked for more than 146 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28560 3100 394 0x80004006 Call Trace: schedule+0xcd/0x2b0 kernel/sched/core.c:4163 wdm_flush+0x2ea/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1251 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+0xb36/0x2c80 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x480/0x2480 kernel/signal.c:2739 do_signal+0x88/0x1ae0 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ad51 Code: Bad RIP value. RSP: 002b:00007ffc1cd9dee0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: fffffffffffffdfc RBX: 00000000000c76a0 RCX: 000000000045ad51 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffc1cd9def0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc1cd9dff0 R11: 0000000000000293 R12: 000000000078bf00 R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c04c Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: ffffffff871110e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/270: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.7.0-rc1-syzkaller #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+0xef/0x16e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1db/0x207 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+0xa99/0xfd0 kernel/hung_task.c:289 kthread+0x326/0x430 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: cdc_wdm 6-1:118.0: wdm_int_callback - 0 bytes NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_serial_in+0x60/0x80 drivers/tty/serial/8250/8250_port.c:447 Code: 0f b6 8d f1 00 00 00 48 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 13 03 5d 40 89 da ec <5b> 0f b6 c0 5d c3 e8 55 5f 44 ff eb c9 e8 7e 5f 44 ff eb e6 66 90 RSP: 0018:ffff8881db209448 EFLAGS: 00000002 RAX: dffffc0000000060 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff822546ac RDI: ffffffff8a059fc0 RBP: ffffffff8a059f80 R08: ffffffff8702f780 R09: ffffed103b64128f R10: 0000000000000003 R11: ffffed103b64128e R12: 0000000000000020 R13: fffffbfff140b441 R14: fffffbfff140b3fa R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045ad27 CR3: 00000001d2602000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_in drivers/tty/serial/8250/8250.h:113 [inline] wait_for_xmitr+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:2057 serial8250_console_putchar+0x1b/0x50 drivers/tty/serial/8250/8250_port.c:3192 uart_console_write+0x59/0x100 drivers/tty/serial/serial_core.c:1949 serial8250_console_write+0x87b/0xa20 drivers/tty/serial/8250/8250_port.c:3264 call_console_drivers kernel/printk/printk.c:1816 [inline] console_unlock+0x843/0xca0 kernel/printk/printk.c:2498 vprintk_emit+0x16d/0x3e0 kernel/printk/printk.c:2021 dev_vprintk_emit+0x4fc/0x541 drivers/base/core.c:3769 dev_printk_emit+0xba/0xf1 drivers/base/core.c:3780 __dev_printk+0x1db/0x203 drivers/base/core.c:3792 _dev_err+0xd7/0x109 drivers/base/core.c:3835 wdm_int_callback.cold+0x155/0x2a6 drivers/usb/class/cdc-wdm.c:259 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1713 dummy_timer+0x125e/0x32b4 drivers/usb/gadget/udc/dummy_hcd.c:1966 call_timer_fn+0x1ac/0x700 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers kernel/time/timer.c:1774 [inline] __run_timers kernel/time/timer.c:1741 [inline] run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1787 __do_softirq+0x21e/0x9aa kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x178/0x1a0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:698 Code: cc cc 41 56 41 55 65 44 8b 2d d4 d2 6b 7a 41 54 55 53 0f 1f 44 00 00 e8 c6 b5 af fb e9 07 00 00 00 0f 00 2d fa 73 4c 00 fb f4 <65> 44 8b 2d b0 d2 6b 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffffff87007da0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffffffff8702f780 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff8702fffc RBP: fffffbfff0e05ef0 R08: ffffffff8702f780 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff87e87b40 R15: 0000000000000000 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3e0/0x500 kernel/sched/idle.c:269 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 start_kernel+0x8a0/0x8da init/main.c:1003 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242