------------[ cut here ]------------
WARNING: CPU: 1 PID: 8796 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: 1 PID: 8796 Comm: syz-executor.0 Not tainted 6.4.0-rc5-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<817da0f8>] (dump_backtrace) from [<817da1ec>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:826229c4 r5:60000093 r4:81f9d804
[<817da1d4>] (show_stack) from [<817f6cc0>] (__dump_stack lib/dump_stack.c:88 [inline])
[<817da1d4>] (show_stack) from [<817f6cc0>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<817f6c78>] (dump_stack_lvl) from [<817f6ce4>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82850d14
[<817f6ccc>] (dump_stack) from [<817dace4>] (panic+0x120/0x370 kernel/panic.c:340)
[<817dabc4>] (panic) from [<80241fd0>] (print_tainted+0x0/0xa0 kernel/panic.c:236)
 r3:8260c488 r2:00000001 r1:81f868f8 r0:81f8e308
 r7:80465848
[<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 r6:81fb2690 r5:8260c960 r4:824adf7c
[<802422cc>] (warn_slowpath_fmt) from [<80465848>] (vma_merge+0x170/0x818 mm/mmap.c:965)
 r10:00000000 r9:00000000 r8:831cd900 r7:200e2000 r6:849ff688 r5:00000000
 r4:849ff948
[<804656d8>] (vma_merge) from [<80531d18>] (userfaultfd_register fs/userfaultfd.c:1485 [inline])
[<804656d8>] (vma_merge) from [<80531d18>] (userfaultfd_ioctl+0x1268/0x1534 fs/userfaultfd.c:2050)
 r10:20ce2000 r9:849ff688 r8:200e2000 r7:849ff948 r6:00100277 r5:85d33000
 r4:ee5a1eb8
[<80530ab0>] (userfaultfd_ioctl) from [<804e55fc>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80530ab0>] (userfaultfd_ioctl) from [<804e55fc>] (do_vfs_ioctl fs/ioctl.c:830 [inline])
[<80530ab0>] (userfaultfd_ioctl) from [<804e55fc>] (__do_sys_ioctl fs/ioctl.c:868 [inline])
[<80530ab0>] (userfaultfd_ioctl) from [<804e55fc>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856)
 r10:8512a360 r9:00000003 r8:85bce240 r7:20000040 r6:85bce241 r5:00000000
 r4:c020aa00
[<804e54ec>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xee5a1fa8 to 0xee5a1ff0)
1fa0:                   00000000 00000000 00000003 c020aa00 20000040 00000000
1fc0: 00000000 00000000 0014c2b8 00000036 7eb653c2 76b1d6d0 7eb65534 76b1d20c
1fe0: 76b1d020 76b1d010 00017004 0004dfb0
 r10:00000036 r9:848d8bc0 r8:80200288 r7:00000036 r6:0014c2b8 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..