NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.5:16565 blocked for more than 140 seconds. Not tainted 4.14.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27776 16565 1 0x00400004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384 schedule+0x92/0x1c0 kernel/sched/core.c:3428 schedule_timeout+0x93b/0xe10 kernel/time/timer.c:1723 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x160/0x290 kernel/locking/semaphore.c:238 down+0x64/0x90 kernel/locking/semaphore.c:62 console_lock+0x28/0x80 kernel/printk/printk.c:2216 con_flush_chars drivers/tty/vt/vt.c:2864 [inline] con_flush_chars+0x31/0x90 drivers/tty/vt/vt.c:2856 __receive_buf drivers/tty/n_tty.c:1650 [inline] n_tty_receive_buf_common+0x93d/0x2570 drivers/tty/n_tty.c:1742 n_tty_receive_buf2+0x34/0x40 drivers/tty/n_tty.c:1777 tty_ldisc_receive_buf+0xa5/0x1a0 drivers/tty/tty_buffer.c:455 paste_selection+0x1e6/0x3f2 drivers/tty/vt/selection.c:360 tioclinux+0x10e/0x400 drivers/tty/vt/vt.c:2696 vt_ioctl+0x180c/0x2170 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c429 RSP: 002b:00007fb87343ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb87343b6d4 RCX: 000000000045c429 RDX: 00000000200001c0 RSI: 000000000000541c RDI: 0000000000000006 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000571 R14: 00000000004c7c09 R15: 000000000076bf2c INFO: task syz-executor.5:16600 blocked for more than 140 seconds. Not tainted 4.14.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28896 16600 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384 schedule+0x92/0x1c0 kernel/sched/core.c:3428 schedule_timeout+0x93b/0xe10 kernel/time/timer.c:1723 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x160/0x290 kernel/locking/semaphore.c:238 down+0x64/0x90 kernel/locking/semaphore.c:62 console_lock+0x28/0x80 kernel/printk/printk.c:2216 con_font_default drivers/tty/vt/vt.c:4185 [inline] con_font_op+0x919/0x1060 drivers/tty/vt/vt.c:4231 vt_ioctl+0x179f/0x2170 drivers/tty/vt/vt_ioctl.c:979 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c429 RSP: 002b:00007fb8733f8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb8733f96d4 RCX: 000000000045c429 RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 000000000076c060 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000036e R14: 00000000004c59c4 R15: 000000000076c06c INFO: task syz-executor.5:16601 blocked for more than 140 seconds. Not tainted 4.14.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28080 16601 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384 schedule+0x92/0x1c0 kernel/sched/core.c:3428 schedule_timeout+0x93b/0xe10 kernel/time/timer.c:1723 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x160/0x290 kernel/locking/semaphore.c:238 down+0x64/0x90 kernel/locking/semaphore.c:62 console_lock+0x28/0x80 kernel/printk/printk.c:2216 paste_selection+0xdb/0x3f2 drivers/tty/vt/selection.c:342 tioclinux+0x10e/0x400 drivers/tty/vt/vt.c:2696 vt_ioctl+0x180c/0x2170 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c429 RSP: 002b:00007fb8733d7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb8733d86d4 RCX: 000000000045c429 RDX: 00000000200001c0 RSI: 000000000000541c RDI: 0000000000000006 RBP: 000000000076c100 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000571 R14: 00000000004c7c09 R15: 000000000076c10c Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544 1 lock held by rsyslogd/7173: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xab/0xd0 fs/file.c:769 2 locks held by getty/7295: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7296: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7297: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7298: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7299: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7300: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156 3 locks held by syz-executor.5/16565: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&buf->lock){+.+.}, at: [] tty_buffer_lock_exclusive+0x1f/0x30 drivers/tty/tty_buffer.c:60 #2: (&tty->termios_rwsem){++++}, at: [] n_tty_receive_buf_common+0x8f/0x2570 drivers/tty/n_tty.c:1705 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e7/0xb90 kernel/hung_task.c:274 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7294 Comm: getty Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880948861c0 task.stack: ffff888094f90000 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xe/0x60 kernel/kcov.c:65 RSP: 0018:ffff888094f97570 EFLAGS: 00000286 RAX: ffff8880948861c0 RBX: ffff8880000a0050 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000140 RDI: ffff888094f97638 RBP: ffff888094f975e0 R08: 00000000ffffff10 R09: 0000000000000004 R10: ffffed104326a01b R11: ffff8882193500df R12: 0000000000000050 R13: 0000000000000000 R14: 00000000b24026af R15: ffff8880000a002a FS: 00007fe180a6d700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c41f972473 CR3: 00000000a501b000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bit_clear_margins+0x2d5/0x4f0 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x292/0x320 drivers/video/fbdev/core/fbcon.c:1317 ypan_up_redraw drivers/video/fbdev/core/fbcon.c:1502 [inline] fbcon_scroll+0x1274/0x3520 drivers/video/fbdev/core/fbcon.c:1880 con_scroll+0x2a5/0x330 drivers/tty/vt/vt.c:327 lf+0x233/0x280 drivers/tty/vt/vt.c:1121 do_con_trol+0x52e/0x5b40 drivers/tty/vt/vt.c:1784 do_con_write.part.0+0xcc7/0x1b50 drivers/tty/vt/vt.c:2434 do_con_write drivers/tty/vt/vt.c:2205 [inline] con_write+0x38/0xc0 drivers/tty/vt/vt.c:2787 do_output_char+0x524/0x7a0 drivers/tty/n_tty.c:447 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe180398370 RSP: 002b:00007ffe825d4428 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe180398370 RDX: 0000000000000001 RSI: 00007fe18064d823 RDI: 0000000000000001 RBP: 00007fe18064d823 R08: 000000000000000a R09: 00007fe180a6d700 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe18064d7a0 R13: 0000000000000001 R14: 000000000000006c R15: 00007ffe825d4724 Code: 4b 08 41 be f4 ff ff ff e8 83 32 ee ff 48 c7 05 e5 5d 4b 08 00 00 00 00 e9 14 ec ff ff 65 48 8b 04 25 40 ee 01 00 48 85 c0 74 1a <65> 8b 15 5b 25 a5 7e 81 e2 00 01 1f 00 75 0b 8b 90 50 13 00 00