syzbot

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WARNING: CPU: 3 PID: 6436 at ./include/linux/sched.h:2185 __clear_task_blocked_on include/linux/sched.h:2185 [inline]
WARNING: CPU: 3 PID: 6436 at ./include/linux/sched.h:2185 __ww_mutex_wound+0x23b/0x3e0 kernel/locking/ww_mutex.h:346
Modules linked in:
CPU: 3 UID: 0 PID: 6436 Comm: syz.0.240 Not tainted 6.16.0-syzkaller-11105-ga6923c06a3b2 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__clear_task_blocked_on include/linux/sched.h:2185 [inline]
RIP: 0010:__ww_mutex_wound+0x23b/0x3e0 kernel/locking/ww_mutex.h:346
Code: 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 85 01 00 00 48 8b 81 78 0a 00 00 48 85 c0 74 09 48 39 c3 74 04 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c
RSP: 0018:ffffc90003aaf298 EFLAGS: 00010083
RAX: ffff8881055ec048 RBX: ffff8880265c0068 RCX: ffff88801e2ea440
RDX: 1ffff11003c5d5d7 RSI: ffffffff8de2752d RDI: ffffffff8c15fb80
RBP: ffff88801e2eaeb8 R08: 0000000000000000 R09: ffffed1004cb800d
R10: ffff8880265c006f R11: 0000000000000000 R12: ffffc9000062fa30
R13: 0000000000000001 R14: 0000000000000007 R15: ffffc90003aaf390
FS:  00005555696e0500(0000) GS:ffff8880d69c8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31c5ffff CR3: 0000000025744000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __ww_mutex_add_waiter kernel/locking/ww_mutex.h:574 [inline]
 __mutex_lock_common kernel/locking/mutex.c:638 [inline]
 __ww_mutex_lock.constprop.0+0x1a69/0x32c0 kernel/locking/mutex.c:767
 ww_mutex_lock+0x37/0x160 kernel/locking/mutex.c:885
 modeset_lock+0x4a0/0x6e0 drivers/gpu/drm/drm_modeset_lock.c:316
 drm_modeset_lock drivers/gpu/drm/drm_modeset_lock.c:398 [inline]
 drm_modeset_lock+0x59/0x90 drivers/gpu/drm/drm_modeset_lock.c:394
 drm_atomic_get_crtc_state+0x100/0x450 drivers/gpu/drm/drm_atomic.c:356
 drm_atomic_get_plane_state+0x436/0x590 drivers/gpu/drm/drm_atomic.c:561
 drm_client_modeset_commit_atomic+0x237/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1055
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1206
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1388 [inline]
 drm_fb_helper_pan_display+0x32d/0xa40 drivers/gpu/drm/drm_fb_helper.c:1448
 fb_pan_display+0x479/0x7d0 drivers/video/fbdev/core/fbmem.c:193
 bit_update_start+0x49/0x1f0 drivers/video/fbdev/core/bitblit.c:380
 fbcon_switch+0xbf5/0x14c0 drivers/video/fbdev/core/fbcon.c:2193
 redraw_screen+0x2c1/0x760 drivers/tty/vt/vt.c:965
 fbcon_set_disp+0x7d4/0xe40 drivers/video/fbdev/core/fbcon.c:1419
 con2fb_init_display drivers/video/fbdev/core/fbcon.c:817 [inline]
 set_con2fb_map+0x703/0x1060 drivers/video/fbdev/core/fbcon.c:890
 fbcon_set_con2fb_map_ioctl+0x16c/0x220 drivers/video/fbdev/core/fbcon.c:3119
 do_fb_ioctl+0x328/0x7e0 drivers/video/fbdev/core/fb_chrdev.c:138
 fb_ioctl+0xe5/0x150 drivers/video/fbdev/core/fb_chrdev.c:169
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3fcdb8eb69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee33a1a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3fcddb5fa0 RCX: 00007f3fcdb8eb69
RDX: 0000200000000000 RSI: 0000000000004610 RDI: 0000000000000003
RBP: 00007f3fcdc11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fcddb5fa0 R14: 00007f3fcddb5fa0 R15: 0000000000000003
 </TASK>