INFO: task syz-executor.2:8612 blocked for more than 143 seconds.
      Not tainted 5.7.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D26328  8612   7278 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3367 [inline]
 __schedule+0x937/0x1ff0 kernel/sched/core.c:4083
 print_usage_bug+0x240/0x240 kernel/locking/lockdep.c:101
 __sched_text_start+0x8/0x8
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
 hlock_class kernel/locking/lockdep.c:179 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3146 [inline]
 validate_chain kernel/locking/lockdep.c:3202 [inline]
 __lock_acquire+0x2184/0x4c50 kernel/locking/lockdep.c:4355
 schedule+0xd0/0x2a0 kernel/sched/core.c:4158
 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874
 find_held_lock+0x2d/0x110 kernel/locking/lockdep.c:4458
 usleep_range+0x160/0x160 kernel/time/timer.c:2093
 __down_common kernel/locking/semaphore.c:219 [inline]
 __down+0x16e/0x2c0 kernel/locking/semaphore.c:237
 lock_downgrade+0x840/0x840 kernel/locking/lockdep.c:4579
 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
 __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 kernel/locking/semaphore.c:220 [inline]
 __down+0x176/0x2c0 kernel/locking/semaphore.c:237
 __up.isra.0+0x190/0x190 include/linux/list.h:112
 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1329
 down+0x57/0x80 kernel/locking/semaphore.c:61
 console_lock+0x25/0x80 kernel/printk/printk.c:2314
 do_fb_ioctl+0x335/0x6e0 drivers/video/fbdev/core/fbmem.c:1106
 tomoyo_path_number_perm+0x238/0x4d0 security/tomoyo/file.c:721
 fb_mmap+0x550/0x550 drivers/video/fbdev/core/fbmem.c:1383
 tomoyo_execute_permission+0x470/0x470 security/tomoyo/file.c:168
 rcu_read_unlock include/linux/rcupdate.h:651 [inline]
 __fget_files+0x30d/0x500 fs/file.c:734
 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310
 ioctl_fioasync fs/ioctl.c:601 [inline]
 do_vfs_ioctl+0x50c/0x1360 fs/ioctl.c:704
 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199
 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
 do_fb_ioctl+0x6e0/0x6e0 drivers/video/fbdev/core/fbmem.c:1169
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:771
 __do_sys_ioctl fs/ioctl.c:780 [inline]
 __se_sys_ioctl fs/ioctl.c:778 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778
 do_syscall_64+0xf6/0x7d0 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/1139:
 #0: ffffffff899bea80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754
1 lock held by in:imklog/6715:
 #0: ffff8880a8d47d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
2 locks held by syz-executor.5/8614:

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1139 Comm: khungtaskd Not tainted 5.7.0-rc5-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+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 lapic_can_unplug_cpu.cold+0x3b/0x3b
 nmi_trigger_cpumask_backtrace+0x231/0x27e 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+0xa8c/0x1010 kernel/hung_task.c:289
 reset_hung_task_detector+0x30/0x30 kernel/hung_task.c:243
 kthread+0x388/0x470 kernel/kthread.c:268
 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8614 Comm: syz-executor.5 Not tainted 5.7.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x20 kernel/kcov.c:248
Code: b6 f7 31 ff eb 80 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 6c ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 04 00 00 00 e9 4e ff ff ff 0f 1f 40 00 66 2e 0f 1f
RSP: 0018:ffffc90006cff598 EFLAGS: 00000286
RAX: 0000000000040000 RBX: 0000000000000050 RCX: ffffffff83c3480a
RDX: 0000000000040000 RSI: 0000000000000021 RDI: 0000000000000050
RBP: 0000000000000021 R08: ffff8880898c6580 R09: ffffed1043191aec
R10: ffff888218c8d75f R11: ffffed1043191aeb R12: ffff8880000a0021
R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000f0009430
FS:  00007f6e18e81700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c012d80000 CR3: 0000000094ce6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vga16fb_fillrect+0x9da/0x1960 drivers/video/fbdev/vga16fb.c:922
 memcpy+0x39/0x60 mm/kasan/common.c:107
 bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
 bit_bmove+0x210/0x210 drivers/video/fbdev/core/bitblit.c:59
 vesafb_probe.cold+0x1162/0x1162
 fbcon_clear_margins+0x1de/0x240 drivers/video/fbdev/core/fbcon.c:1381
 fbcon_switch+0xcde/0x16f0 drivers/video/fbdev/core/fbcon.c:2363
 fbcon_set_def_font+0x370/0x370 drivers/video/fbdev/core/fbcon.c:2710
 fbcon_cursor+0x477/0x650 drivers/video/fbdev/core/fbcon.c:1411
 bit_clear+0x4e0/0x4e0 drivers/video/fbdev/core/fbcon.h:140
 is_console_locked+0x5/0x10 kernel/printk/printk.c:2346
 fbcon_set_origin+0x26/0x50 drivers/video/fbdev/core/fbcon.c:2938
 redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015
 vesafb_probe.cold+0x1162/0x1162
 respond_string+0x290/0x290 include/linux/tty_flip.h:27
 fbcon_set_palette+0x3b1/0x4a0 drivers/video/fbdev/core/fbcon.c:2764
 fbcon_modechanged+0x581/0x720 drivers/video/fbdev/core/fbcon.c:3000
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047
 fb_set_var+0xad0/0xd40 drivers/video/fbdev/core/fbmem.c:1056
 fb_blank+0x190/0x190 drivers/video/fbdev/core/fbmem.c:1081
 mark_held_locks+0xe0/0xe0 kernel/locking/lockdep.c:3620
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irqrestore+0x62/0xe0 kernel/locking/spinlock.c:191
 do_fb_ioctl+0x390/0x6e0 drivers/video/fbdev/core/fbmem.c:1109
 fb_mmap+0x550/0x550 drivers/video/fbdev/core/fbmem.c:1383
 tomoyo_execute_permission+0x470/0x470 security/tomoyo/file.c:168
 rcu_read_unlock include/linux/rcupdate.h:651 [inline]
 __fget_files+0x30d/0x500 fs/file.c:734
 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310
 ioctl_fioasync fs/ioctl.c:601 [inline]
 do_vfs_ioctl+0x50c/0x1360 fs/ioctl.c:704
 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199
 __do_sys_futex kernel/futex.c:3869 [inline]
 __se_sys_futex kernel/futex.c:3837 [inline]
 __x64_sys_futex+0x380/0x4f0 kernel/futex.c:3837
 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
 do_fb_ioctl+0x6e0/0x6e0 drivers/video/fbdev/core/fbmem.c:1169
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:771
 __do_sys_ioctl fs/ioctl.c:780 [inline]
 __se_sys_ioctl fs/ioctl.c:778 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline]
 lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c829
Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6e18e80c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e4860 RCX: 000000000045c829
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002f2 R14: 00000000004c54c8 R15: 00007f6e18e816d4