------------[ cut here ]------------
WARNING: CPU: 0 PID: 17076 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: 17076 Comm: syz-executor.0 Not tainted 6.4.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<817d8de4>] (dump_backtrace) from [<817d8ed8>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:826229c4 r5:60000093 r4:81f9d3a4
[<817d8ec0>] (show_stack) from [<817f59b0>] (__dump_stack lib/dump_stack.c:88 [inline])
[<817d8ec0>] (show_stack) from [<817f59b0>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<817f5968>] (dump_stack_lvl) from [<817f59d4>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82850d14
[<817f59bc>] (dump_stack) from [<817d99d0>] (panic+0x120/0x370 kernel/panic.c:340)
[<817d98b0>] (panic) from [<80241fe8>] (print_tainted+0x0/0xa0 kernel/panic.c:236)
 r3:8260c488 r2:00000001 r1:81f86498 r0:81f8dea8
 r7:80465838
[<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 r6:81fb2224 r5:8260c964 r4:824adf7c
[<802422e4>] (warn_slowpath_fmt) from [<80465838>] (vma_merge+0x170/0x818 mm/mmap.c:965)
 r10:00000000 r9:00000000 r8:83386c80 r7:200e2000 r6:87eb7dc0 r5:00000000
 r4:87eb7c08
[<804656c8>] (vma_merge) from [<80531ca4>] (userfaultfd_register fs/userfaultfd.c:1485 [inline])
[<804656c8>] (vma_merge) from [<80531ca4>] (userfaultfd_ioctl+0x1268/0x1534 fs/userfaultfd.c:2050)
 r10:20ce2000 r9:87eb7dc0 r8:200e2000 r7:87eb7c08 r6:00100277 r5:946fb000
 r4:dfd01eb8
[<80530a3c>] (userfaultfd_ioctl) from [<804e5584>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80530a3c>] (userfaultfd_ioctl) from [<804e5584>] (do_vfs_ioctl fs/ioctl.c:830 [inline])
[<80530a3c>] (userfaultfd_ioctl) from [<804e5584>] (__do_sys_ioctl fs/ioctl.c:868 [inline])
[<80530a3c>] (userfaultfd_ioctl) from [<804e5584>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856)
 r10:852c0510 r9:00000008 r8:85918540 r7:20000100 r6:85918541 r5:00000000
 r4:c020aa00
[<804e5474>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfd01fa8 to 0xdfd01ff0)
1fa0:                   00000000 00000000 00000008 c020aa00 20000100 00000000
1fc0: 00000000 00000000 0014c2b8 00000036 7efd63c2 76b846d0 7efd6534 76b8420c
1fe0: 76b84020 76b84010 00017004 0004dfb0
 r10:00000036 r9:846a5240 r8:80200288 r7:00000036 r6:0014c2b8 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..