INFO: task syz-executor.0:2293 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.0 D28560 2293 1671 0x00004004 Call Trace: context_switch kernel/sched/core.c:3372 [inline] __schedule+0x805/0xc90 kernel/sched/core.c:4088 schedule+0x188/0x220 kernel/sched/core.c:4163 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline] do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 __down_common+0x28a/0x520 kernel/locking/semaphore.c:220 down+0x65/0xa0 kernel/locking/semaphore.c:61 console_lock+0x24/0x70 kernel/printk/printk.c:2314 do_fb_ioctl+0x4c9/0x6f0 drivers/video/fbdev/core/fbmem.c:1106 fb_write+0x540/0x540 drivers/video/fbdev/core/fbmem.c:849 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl fs/ioctl.c:763 [inline] __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: task syz-executor.2:2307 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 D26896 2307 1863 0x00004004 Call Trace: context_switch kernel/sched/core.c:3372 [inline] __schedule+0x805/0xc90 kernel/sched/core.c:4088 check_preemption_disabled+0x33/0x240 lib/smp_processor_id.c:16 schedule+0x188/0x220 kernel/sched/core.c:4163 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874 trace_hardirqs_on+0x30/0x70 kernel/trace/trace_preemptirq.c:25 arch_local_irq_enable arch/x86/include/asm/paravirt.h:769 [inline] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x57/0x80 kernel/locking/spinlock.c:199 __down_common+0x28a/0x520 kernel/locking/semaphore.c:220 down+0x65/0xa0 kernel/locking/semaphore.c:61 console_lock+0x24/0x70 kernel/printk/printk.c:2314 do_fb_ioctl+0x4c9/0x6f0 drivers/video/fbdev/core/fbmem.c:1106 fb_write+0x540/0x540 drivers/video/fbdev/core/fbmem.c:849 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl fs/ioctl.c:763 [inline] __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: task syz-executor.5:2312 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 D27664 2312 1862 0x00004004 Call Trace: context_switch kernel/sched/core.c:3372 [inline] __schedule+0x805/0xc90 kernel/sched/core.c:4088 check_preemption_disabled+0x33/0x240 lib/smp_processor_id.c:16 schedule+0x188/0x220 kernel/sched/core.c:4163 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874 trace_hardirqs_on+0x30/0x70 kernel/trace/trace_preemptirq.c:25 arch_local_irq_enable arch/x86/include/asm/paravirt.h:769 [inline] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x57/0x80 kernel/locking/spinlock.c:199 __down_common+0x28a/0x520 kernel/locking/semaphore.c:220 down+0x65/0xa0 kernel/locking/semaphore.c:61 console_lock+0x24/0x70 kernel/printk/printk.c:2314 do_fb_ioctl+0x4c9/0x6f0 drivers/video/fbdev/core/fbmem.c:1106 fb_write+0x540/0x540 drivers/video/fbdev/core/fbmem.c:849 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl fs/ioctl.c:763 [inline] __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Showing all locks held in the system: 1 lock held by khungtaskd/1138: #0: ffffffff892e8590 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 net/mptcp/pm_netlink.c:858 1 lock held by in:imklog/6709: #0: ffff8880a958ae30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 fs/file.c:826 5 locks held by syz-executor.4/1651: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1138 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+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 arch_trigger_cpumask_backtrace+0x10/0x10 arch/x86/kernel/apic/hw_nmi.c:38 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd2a/0xd40 kernel/hung_task.c:289 kthread+0x353/0x380 kernel/kthread.c:268 hungtask_pm_notify+0x50/0x50 kernel/hung_task.c:265 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247 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 CPU: 0 PID: 1651 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:comp drivers/video/fbdev/core/fb_draw.h:17 [inline] RIP: 0010:bitfill_aligned+0xf9/0x1f0 drivers/video/fbdev/core/cfbfillrect.c:50 Code: 49 f7 d4 41 89 ef 31 ed 31 ff 44 89 fe e8 ef 3e a6 fd 41 83 ff 01 48 19 ed 4c 09 e5 48 23 6c 24 10 48 8b 03 49 31 c6 49 21 ee <49> 31 c6 4c 89 33 e9 da 00 00 00 e8 27 3b a6 fd 44 8b 24 24 48 8b RSP: 0018:ffffc90003d2f218 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880000a0000 RCX: 0000000000000002 RDX: ffffc90012810000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffffffffffff R08: ffffffff83cd2781 R09: 0000000000000040 R10: ffff88804a662480 R11: 0000000000000002 R12: 0000000000000000 R13: 0000000000000040 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff58e2fb700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a7c009129 CR3: 0000000055ed2000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bitfill_aligned_rev+0x1e0/0x1e0 drivers/video/fbdev/core/cfbfillrect.c:206 cfb_fillrect+0x57b/0x790 drivers/video/fbdev/core/cfbfillrect.c:327 bit_clear_margins+0x37b/0x620 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1381 [inline] ypan_up_redraw drivers/video/fbdev/core/fbcon.c:1566 [inline] fbcon_scroll+0x2eee/0x6150 drivers/video/fbdev/core/fbcon.c:1944 con_scroll+0x517/0x7b0 drivers/tty/vt/vt.c:631 lf drivers/tty/vt/vt.c:1477 [inline] do_con_write+0x14ce/0xf2d0 drivers/tty/vt/vt.c:2775 finish_task_switch+0x24f/0x550 kernel/sched/core.c:3211 con_write+0x20/0x40 drivers/tty/vt/vt.c:3153 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0xcbf/0x1170 drivers/tty/n_tty.c:2333 wait_woken+0x240/0x240 kernel/sched/wait.c:442 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x593/0x940 drivers/tty/tty_io.c:1046 n_tty_read+0x1bc0/0x1bc0 drivers/tty/n_tty.c:2186 redirected_tty_write+0xb0/0xb0 drivers/tty/tty_io.c:1067 __vfs_write+0xa7/0x710 fs/read_write.c:495 trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 __kernel_write+0x120/0x350 fs/read_write.c:516 write_pipe_buf+0xf9/0x150 fs/splice.c:809 splice_from_pipe_feed fs/splice.c:512 [inline] __splice_from_pipe+0x329/0x870 fs/splice.c:636 default_file_splice_write+0x1b0/0x1b0 fs/splice.c:663 splice_from_pipe fs/splice.c:671 [inline] default_file_splice_write+0x112/0x1b0 fs/splice.c:821 splice_direct_to_actor+0x482/0xb40 fs/splice.c:992 do_splice_direct+0x340/0x340 fs/splice.c:1073 do_splice_direct+0x201/0x340 fs/splice.c:1080 do_sendfile+0x809/0xfe0 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x164/0x1a0 fs/read_write.c:1568 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c889 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff58e2fac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ff58e2fb6d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0800000080004105 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008d6 R14: 00000000004cb7ee R15: 000000000076bf0c