------------[ cut here ]------------
WARNING: CPU: 0 PID: 31150 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 31150 Comm: syz-executor.1 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<81802550>] (dump_backtrace) from [<818027c4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
 r7:00000080 r6:60000193 r5:00000000 r4:82b58344
[<818027ac>] (show_stack) from [<81809e98>] (__dump_stack lib/dump_stack.c:79 [inline])
[<818027ac>] (show_stack) from [<81809e98>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
[<81809de0>] (dump_stack) from [<81803358>] (panic+0x130/0x378 kernel/panic.c:231)
 r7:81f48198 r6:82a390a4 r5:00000000 r4:82c6b0d0
[<81803228>] (panic) from [<802446f4>] (__warn+0xb0/0x164 kernel/panic.c:605)
 r3:82a2248c r2:00000000 r1:00000000 r0:81f48198
 r7:00000015
[<80244644>] (__warn) from [<81803608>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628)
 r7:809fa964 r6:00000015 r5:81fcbd70 r4:00000000
[<818035a4>] (warn_slowpath_fmt) from [<809fa964>] (vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21)
 r8:00fe4c00 r7:83494720 r6:82a22498 r5:00000000 r4:83495390
[<809fa814>] (vkms_vblank_simulate) from [<80307ebc>] (__run_hrtimer kernel/time/hrtimer.c:1537 [inline])
[<809fa814>] (vkms_vblank_simulate) from [<80307ebc>] (__hrtimer_run_queues+0xd4/0x690 kernel/time/hrtimer.c:1601)
 r9:868a6000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:83495390
[<80307de8>] (__hrtimer_run_queues) from [<80308da0>] (hrtimer_interrupt+0x14c/0x2e0 kernel/time/hrtimer.c:1663)
 r10:ddfc54d8 r9:ddfc5498 r8:ddfc5458 r7:ddfc54a0 r6:ddfc54e0 r5:20000193
 r4:ddfc5380
[<80308c54>] (hrtimer_interrupt) from [<8114c308>] (timer_handler drivers/clocksource/arm_arch_timer.c:647 [inline])
[<80308c54>] (hrtimer_interrupt) from [<8114c308>] (arch_timer_handler_virt+0x30/0x38 drivers/clocksource/arm_arch_timer.c:658)
 r10:868a7ce0 r9:868a7d48 r8:868a7cb0 r7:8348d940 r6:82a22c34 r5:0000001c
 r4:8348b000
[<8114c2d8>] (arch_timer_handler_virt) from [<802df904>] (handle_percpu_devid_irq+0xa4/0x19c kernel/irq/chip.c:930)
[<802df860>] (handle_percpu_devid_irq) from [<802d8730>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline])
[<802df860>] (handle_percpu_devid_irq) from [<802d8730>] (generic_handle_irq kernel/irq/irqdesc.c:652 [inline])
[<802df860>] (handle_percpu_devid_irq) from [<802d8730>] (__handle_domain_irq+0xb0/0x120 kernel/irq/irqdesc.c:689)
 r10:868a7ce0 r9:868a7d48 r8:00000001 r7:00000000 r6:828ad498 r5:00000000
 r4:828ad498 r3:00010000
[<802d8680>] (__handle_domain_irq) from [<8088af70>] (handle_domain_irq include/linux/irqdesc.h:176 [inline])
[<802d8680>] (__handle_domain_irq) from [<8088af70>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370)
 r10:20000013 r9:868a6000 r8:e000200c r7:828ad4bc r6:e0002000 r5:868a7d48
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x868a7d48 to 0x868a7d90)
7d40:                   00000000 821137b8 00000001 20000093 82b0bb80 82b0bc44
7d60: 806031e4 82b0bcd0 00000001 00000000 20000013 868a7ddc 868a7d40 868a7d98
7d80: 8181dacc 8030b480 20000013 ffffffff
 r9:868a6000 r8:00000001 r7:868a7d7c r6:ffffffff r5:20000013 r4:8030b480
[<8030b410>] (ktime_get_real_seconds) from [<806031e4>] (recently_deleted fs/ext4/ialloc.c:703 [inline])
[<8030b410>] (ktime_get_real_seconds) from [<806031e4>] (find_inode_bit+0xf0/0x174 fs/ext4/ialloc.c:728)
 r10:000026f6 r9:00000003 r8:860394e0 r7:00000000 r6:868a7e74 r5:86039840
 r4:8577f000
[<806030f4>] (find_inode_bit) from [<80605884>] (__ext4_new_inode+0x388/0x1c9c fs/ext4/ialloc.c:1063)
 r10:81a1ff2c r9:8568e060 r8:860394e0 r7:00000008 r6:876ab028 r5:00000000
 r4:8577f000
[<806054fc>] (__ext4_new_inode) from [<8063c8e8>] (ext4_symlink+0x130/0x3f8 fs/ext4/namei.c:3347)
 r10:868a7eec r9:82a3c39c r8:87682cc0 r7:00000013 r6:85b3d010 r5:876acd10
 r4:00000000
[<8063c7b8>] (ext4_symlink) from [<804e93f8>] (vfs_symlink fs/namei.c:4176 [inline])
[<8063c7b8>] (ext4_symlink) from [<804e93f8>] (vfs_symlink+0x70/0xf8 fs/namei.c:4161)
 r10:00000053 r9:00087c00 r8:87682cc0 r7:85b3d010 r6:876acd10 r5:82a3c39c
 r4:8063c7b8
[<804e9388>] (vfs_symlink) from [<804eeab0>] (do_symlinkat+0x128/0x140 fs/namei.c:4206)
 r8:ffffff9c r7:85b3d000 r6:00000000 r5:00000000 r4:87682cc0
[<804ee988>] (do_symlinkat) from [<804efe10>] (__do_sys_symlink fs/namei.c:4227 [inline])
[<804ee988>] (do_symlinkat) from [<804efe10>] (sys_symlink+0x18/0x1c fs/namei.c:4225)
 r9:868a6000 r8:80200224 r7:00000053 r6:000027a5 r5:00000000 r4:00000001
[<804efdf8>] (sys_symlink) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64)
Exception stack(0x868a7fa8 to 0x868a7ff0)
7fa0:                   00000001 00000000 7e9f4604 00087c00 00000000 00000000
7fc0: 00000001 00000000 000027a5 00000053 000003e8 7e9f4604 001208c0 7e9f4604
7fe0: 00000003 7e9f4534 000209b8 0004ae3c
Rebooting in 86400 seconds..