------------[ cut here ]------------
WARNING: CPU: 0 PID: 3270 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: 3270 Comm: syz-executor.0 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 r7:8365e720 r6:82a22498 r5:00000000 r4:8365f390
[<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)
 r9:866a4000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:8365f390
[<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)
 r10:866a5c00 r9:866a5c68 r8:866a5bd0 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)
 r10:866a5c00 r9:866a5c68 r8:00000001 r7:00000000 r6:828ad498 r5:00000000
 r4:828ad498 r3:00010001
[<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)
 r10:859d9040 r9:40000193 r8:e000200c r7:828ad4bc r6:e0002000 r5:866a5c68
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x866a5c68 to 0x866a5cb0)
5c60:                   00000000 5b71e000 828a2680 60000093 859d9708 00000002
5c80: 82b09c84 828a2680 00000000 60000013 859d9040 866a5ce4 866a5ca8 866a5cb8
5ca0: 8181dacc 8181c9d0 20000013 ffffffff
 r9:866a4000 r8:00000000 r7:866a5c9c r6:ffffffff r5:20000013 r4:8181c9d0
[<8181c880>] (lock_is_held_type) from [<802e7e14>] (lock_is_held include/linux/lockdep.h:278 [inline])
[<8181c880>] (lock_is_held_type) from [<802e7e14>] (rcu_read_lock_sched_held+0x44/0x7c kernel/rcu/update.c:125)
 r10:80603380 r9:82a22498 r8:00000002 r7:00000000 r6:00000000 r5:82b09c5c
 r4:82bfd3d6 r3:866a4000
[<802e7dd0>] (rcu_read_lock_sched_held) from [<802b9208>] (trace_lock_acquire+0x24c/0x278 include/trace/events/lock.h:13)
[<802b8fbc>] (trace_lock_acquire) from [<802bfef8>] (lock_acquire+0x3c/0x74 kernel/locking/lockdep.c:5481)
 r10:80603380 r9:00000000 r8:00000000 r7:00000002 r6:00000000 r5:00000000
 r4:82b09c5c
[<802bfebc>] (lock_acquire) from [<806033c0>] (rcu_lock_acquire include/linux/rcupdate.h:267 [inline])
[<802bfebc>] (lock_acquire) from [<806033c0>] (rcu_read_lock include/linux/rcupdate.h:656 [inline])
[<802bfebc>] (lock_acquire) from [<806033c0>] (ext4_get_group_info+0x64/0x18c fs/ext4/ext4.h:3228)
 r10:82a22498 r9:00020001 r8:00000000 r7:00000004 r6:00000000 r5:856cc800
 r4:00000004
[<8060335c>] (ext4_get_group_info) from [<80603e4c>] (ext4_validate_inode_bitmap fs/ext4/ialloc.c:90 [inline])
[<8060335c>] (ext4_get_group_info) from [<80603e4c>] (ext4_read_inode_bitmap+0x2c0/0x89c fs/ext4/ialloc.c:210)
 r7:00000004 r6:857ac080 r5:8601aea0 r4:856cc800
[<80603b8c>] (ext4_read_inode_bitmap) from [<80604698>] (ext4_free_inode+0x254/0x8cc fs/ext4/ialloc.c:287)
 r10:82a22498 r9:836ca000 r8:0000808d r7:82bfd6e9 r6:86172a60 r5:00000001
 r4:856cc800
[<80604444>] (ext4_free_inode) from [<8061be14>] (ext4_evict_inode+0x598/0x818 fs/ext4/inode.c:333)
 r10:00000000 r9:00000001 r8:00000006 r7:00000000 r6:00000000 r5:00000001
 r4:86172a60
[<8061b87c>] (ext4_evict_inode) from [<804ff308>] (evict+0xb0/0x194 fs/inode.c:578)
 r10:86247180 r9:82c0176c r8:86172ad0 r7:866a4000 r6:81a22008 r5:86172b98
 r4:86172a60
[<804ff258>] (evict) from [<804ffde4>] (iput_final fs/inode.c:1654 [inline])
[<804ff258>] (evict) from [<804ffde4>] (iput fs/inode.c:1680 [inline])
[<804ff258>] (evict) from [<804ffde4>] (iput+0x284/0x3c4 fs/inode.c:1666)
 r7:866a4000 r6:81a22008 r5:86172a60 r4:856cc800
[<804ffb60>] (iput) from [<804efc28>] (do_unlinkat+0x1cc/0x2c4 fs/namei.c:4103)
 r10:86247180 r9:866a5f38 r8:ffffff9c r7:00000000 r6:86172a60 r5:85bf9000
 r4:00000000 r3:00000000
[<804efa5c>] (do_unlinkat) from [<804efdd0>] (__do_sys_unlink fs/namei.c:4143 [inline])
[<804efa5c>] (do_unlinkat) from [<804efdd0>] (sys_unlink+0x54/0x68 fs/namei.c:4141)
 r10:0000000a r9:866a4000 r8:80200224 r7:0000000a r6:00120000 r5:7e986520
 r4:7e986520
[<804efd7c>] (sys_unlink) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64)
Exception stack(0x866a5fa8 to 0x866a5ff0)
5fa0:                   000853d8 7e986520 7e986520 202fbf00 00000000 00008000
5fc0: 000853d8 7e986520 00120000 0000000a 000853d8 02ae7fc8 00000000 7e9864e0
5fe0: 7e986430 7e9864a4 00014548 0004adbc
 r5:7e986520 r4:000853d8
Rebooting in 86400 seconds..