------------[ cut here ]------------
WARNING: CPU: 0 PID: 6242 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: 6242 Comm: syz-executor.0 Not tainted 6.4.0-rc5-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<817da2d8>] (dump_backtrace) from [<817da3cc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:826229c4 r5:60000093 r4:81f9d8a4
[<817da3b4>] (show_stack) from [<817f6ea8>] (__dump_stack lib/dump_stack.c:88 [inline])
[<817da3b4>] (show_stack) from [<817f6ea8>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<817f6e60>] (dump_stack_lvl) from [<817f6ecc>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82850d14
[<817f6eb4>] (dump_stack) from [<817daec4>] (panic+0x120/0x370 kernel/panic.c:340)
[<817dada4>] (panic) from [<80241fd0>] (print_tainted+0x0/0xa0 kernel/panic.c:236)
 r3:8260c488 r2:00000001 r1:81f86998 r0:81f8e3a8
 r7:80465730
[<80241f4c>] (check_panic_on_warn) from [<802421c4>] (__warn+0x7c/0x180 kernel/panic.c:673)
[<80242148>] (__warn) from [<802423a0>] (warn_slowpath_fmt+0xd8/0x1d8 kernel/panic.c:697)
 r8:00000009 r7:000003c5 r6:81fb2730 r5:8260c960 r4:824adf7c
[<802422cc>] (warn_slowpath_fmt) from [<80465730>] (vma_merge+0x170/0x818 mm/mmap.c:965)
 r10:00000000 r9:00000000 r8:848d5680 r7:200e2000 r6:84c493c8 r5:00000000
 r4:84c49e18
[<804655c0>] (vma_merge) from [<80531c00>] (userfaultfd_register fs/userfaultfd.c:1485 [inline])
[<804655c0>] (vma_merge) from [<80531c00>] (userfaultfd_ioctl+0x1268/0x1534 fs/userfaultfd.c:2050)
 r10:20ce2000 r9:84c493c8 r8:200e2000 r7:84c49e18 r6:00100277 r5:85d7d100
 r4:eab59eb8
[<80530998>] (userfaultfd_ioctl) from [<804e54e4>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80530998>] (userfaultfd_ioctl) from [<804e54e4>] (do_vfs_ioctl fs/ioctl.c:830 [inline])
[<80530998>] (userfaultfd_ioctl) from [<804e54e4>] (__do_sys_ioctl fs/ioctl.c:868 [inline])
[<80530998>] (userfaultfd_ioctl) from [<804e54e4>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856)
 r10:851c30e0 r9:00000007 r8:835886c0 r7:20000100 r6:835886c1 r5:00000000
 r4:c020aa00
[<804e53d4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xeab59fa8 to 0xeab59ff0)
9fa0:                   00000000 00000000 00000007 c020aa00 20000100 00000000
9fc0: 00000000 00000000 0014c348 00000036 7eb433c2 76b1b6d0 7eb43534 76b1b20c
9fe0: 76b1b020 76b1b010 00017004 0004dfb0
 r10:00000036 r9:83512f00 r8:80200288 r7:00000036 r6:0014c348 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..