------------[ cut here ]------------
WARNING: CPU: 0 PID: 9403 at mm/mmap.c:965 vma_merge+0x170/0x818 mm/mmap.c:965
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 PID: 9403 Comm: syz-executor.0 Not tainted 6.4.0-rc3-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<817d92b8>] (dump_backtrace) from [<817d93ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:826229c4 r5:60000093 r4:81f9d570
[<817d9394>] (show_stack) from [<817f5e80>] (__dump_stack lib/dump_stack.c:88 [inline])
[<817d9394>] (show_stack) from [<817f5e80>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<817f5e38>] (dump_stack_lvl) from [<817f5ea4>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82850d14
[<817f5e8c>] (dump_stack) from [<817d9ea4>] (panic+0x120/0x370 kernel/panic.c:340)
[<817d9d84>] (panic) from [<80241fe8>] (print_tainted+0x0/0xa0 kernel/panic.c:236)
 r3:8260c488 r2:00000001 r1:81f86664 r0:81f8e074
 r7:80465830
[<80241f64>] (check_panic_on_warn) from [<802421dc>] (__warn+0x7c/0x180 kernel/panic.c:673)
[<80242160>] (__warn) from [<802423b8>] (warn_slowpath_fmt+0xd8/0x1d8 kernel/panic.c:697)
 r8:00000009 r7:000003c5 r6:81fb23f0 r5:8260c964 r4:824adf7c
[<802422e4>] (warn_slowpath_fmt) from [<80465830>] (vma_merge+0x170/0x818 mm/mmap.c:965)
 r10:00000000 r9:00000000 r8:8333d180 r7:200e2000 r6:85c104d0 r5:00000000
 r4:85c10108
[<804656c0>] (vma_merge) from [<80531d04>] (userfaultfd_register fs/userfaultfd.c:1485 [inline])
[<804656c0>] (vma_merge) from [<80531d04>] (userfaultfd_ioctl+0x1268/0x1534 fs/userfaultfd.c:2050)
 r10:20ce2000 r9:85c104d0 r8:200e2000 r7:85c10108 r6:00100277 r5:85c0c000
 r4:dfc45eb8
[<80530a9c>] (userfaultfd_ioctl) from [<804e55e4>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80530a9c>] (userfaultfd_ioctl) from [<804e55e4>] (do_vfs_ioctl fs/ioctl.c:830 [inline])
[<80530a9c>] (userfaultfd_ioctl) from [<804e55e4>] (__do_sys_ioctl fs/ioctl.c:868 [inline])
[<80530a9c>] (userfaultfd_ioctl) from [<804e55e4>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856)
 r10:85344000 r9:00000003 r8:85bfed80 r7:20000100 r6:85bfed81 r5:00000000
 r4:c020aa00
[<804e54d4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfc45fa8 to 0xdfc45ff0)
5fa0:                   00000000 00000000 00000003 c020aa00 20000100 00000000
5fc0: 00000000 00000000 0014c2b8 00000036 7e85a3c2 76b0b6d0 7e85a534 76b0b20c
5fe0: 76b0b020 76b0b010 00017004 0004dfb0
 r10:00000036 r9:845ea340 r8:80200288 r7:00000036 r6:0014c2b8 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..