INFO: task syz-executor.5:20856 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:28520 pid:20856 ppid: 6893 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea5/0x21b0 kernel/sched/core.c:4526 schedule+0xcf/0x270 kernel/sched/core.c:4604 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x15e/0x270 kernel/sched/completion.c:157 usb_start_wait_urb+0x144/0x2b0 drivers/usb/core/message.c:63 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:254 do_proc_bulk+0x39b/0x710 drivers/usb/core/devio.c:1231 proc_bulk drivers/usb/core/devio.c:1268 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2542 [inline] usbdev_ioctl+0x586/0x34f0 drivers/usb/core/devio.c:2708 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5f9 Code: Bad RIP value. RSP: 002b:00007fb9d0cdcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001aa40 RCX: 000000000045d5f9 RDX: 0000000020000440 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffda8d1db9f R14: 00007fb9d0cdd9c0 R15: 000000000118cf4c INFO: task syz-executor.5:20856 blocked for more than 143 seconds. Not tainted 5.9.0-rc5-next-20200914-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28520 pid:20856 ppid: 6893 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea5/0x21b0 kernel/sched/core.c:4526 schedule+0xcf/0x270 kernel/sched/core.c:4604 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x15e/0x270 kernel/sched/completion.c:157 usb_start_wait_urb+0x144/0x2b0 drivers/usb/core/message.c:63 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:254 do_proc_bulk+0x39b/0x710 drivers/usb/core/devio.c:1231 proc_bulk drivers/usb/core/devio.c:1268 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2542 [inline] usbdev_ioctl+0x586/0x34f0 drivers/usb/core/devio.c:2708 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5f9 Code: Bad RIP value. RSP: 002b:00007fb9d0cdcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001aa40 RCX: 000000000045d5f9 RDX: 0000000020000440 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffda8d1db9f R14: 00007fb9d0cdd9c0 R15: 000000000118cf4c Showing all locks held in the system: 3 locks held by kworker/u4:5/693: 1 lock held by khungtaskd/1170: #0: ffffffff89e71c80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6221 3 locks held by in:imklog/6763: #0: ffff88809a2e93f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 #1: ffffffff89e71c80 (rcu_read_lock){....}-{1:2}, at: double_lock_hb kernel/futex.c:1561 [inline] #1: ffffffff89e71c80 (rcu_read_lock){....}-{1:2}, at: double_lock_hb kernel/futex.c:1556 [inline] #1: ffffffff89e71c80 (rcu_read_lock){....}-{1:2}, at: futex_wake_op kernel/futex.c:1697 [inline] #1: ffffffff89e71c80 (rcu_read_lock){....}-{1:2}, at: do_futex+0xd61/0x1a30 kernel/futex.c:3760 #2: ffff8880ae620ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2fb/0x400 kernel/sched/psi.c:833 2 locks held by agetty/6766: #0: ffff8880a046d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc900010942e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a70 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc5-next-20200914-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+0x198/0x1fb lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3899 Comm: systemd-journal Not tainted 5.9.0-rc5-next-20200914-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_read_lock include/linux/rcupdate.h:642 [inline] RIP: 0010:__task_pid_nr_ns+0x397/0x490 kernel/pid.c:496 Code: ff e8 cd a9 26 00 48 c7 c2 00 f9 6a 88 be f3 01 00 00 48 c7 c7 60 f9 6a 88 c6 05 da d6 92 09 01 e8 63 3f 8d 06 e9 63 fd ff ff a4 a9 26 00 e8 cf a0 13 00 31 ff 41 89 c5 89 c6 e8 d3 a5 26 00 RSP: 0018:ffffc90003e07f18 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814c1e9b RDX: 0000000000000000 RSI: ffff888093912300 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8c9be9a7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888093912300 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f92e58b78c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f92e2e65010 CR3: 0000000094184000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: task_tgid_vnr include/linux/sched.h:1429 [inline] __do_sys_getpid+0x1a/0x20 kernel/sys.c:907 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f92e4b50f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007fff5d32e668 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 00005610ff7551e0 RCX: 00007f92e4b50f17 RDX: 00007fff5d32e728 RSI: 0000000000000001 RDI: 00005610ff7551e0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000206 R12: 00007fff5d32e728 R13: 0000000000000f3b R14: 00007fff5d331510 R15: 00007fff5d32eb20