------------[ cut here ]------------
WARNING: CPU: 1 PID: 26704 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: 26704 Comm: syz-executor.1 Not tainted 6.4.0-rc4-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<817d97b8>] (dump_backtrace) from [<817d98ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:826229c4 r5:60000093 r4:81f9d60c
[<817d9894>] (show_stack) from [<817f6380>] (__dump_stack lib/dump_stack.c:88 [inline])
[<817d9894>] (show_stack) from [<817f6380>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<817f6338>] (dump_stack_lvl) from [<817f63a4>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82850d14
[<817f638c>] (dump_stack) from [<817da3a4>] (panic+0x120/0x370 kernel/panic.c:340)
[<817da284>] (panic) from [<80241fe8>] (print_tainted+0x0/0xa0 kernel/panic.c:236)
 r3:8260c488 r2:00000001 r1:81f86700 r0:81f8e110
 r7:80465898
[<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 r6:81fb248c r5:8260c964 r4:824adf7c
[<802422e4>] (warn_slowpath_fmt) from [<80465898>] (vma_merge+0x170/0x818 mm/mmap.c:965)
 r10:00000000 r9:00000000 r8:889c8a00 r7:20ffb000 r6:84e452c0 r5:00000000
 r4:84e45790
[<80465728>] (vma_merge) from [<80531d68>] (userfaultfd_register fs/userfaultfd.c:1485 [inline])
[<80465728>] (vma_merge) from [<80531d68>] (userfaultfd_ioctl+0x1268/0x1534 fs/userfaultfd.c:2050)
 r10:20fff000 r9:84e452c0 r8:20ffb000 r7:84e45790 r6:00100277 r5:85f2d180
 r4:e488deb8
[<80530b00>] (userfaultfd_ioctl) from [<804e564c>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80530b00>] (userfaultfd_ioctl) from [<804e564c>] (do_vfs_ioctl fs/ioctl.c:830 [inline])
[<80530b00>] (userfaultfd_ioctl) from [<804e564c>] (__do_sys_ioctl fs/ioctl.c:868 [inline])
[<80530b00>] (userfaultfd_ioctl) from [<804e564c>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856)
 r10:85216510 r9:00000003 r8:84ba4e40 r7:20000000 r6:84ba4e41 r5:00000000
 r4:c020aa00
[<804e553c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xe488dfa8 to 0xe488dff0)
dfa0:                   00000000 00000000 00000003 c020aa00 20000000 00000000
dfc0: 00000000 00000000 0014c2b8 00000036 7ee233c2 76ba16d0 7ee23534 76ba120c
dfe0: 76ba1020 76ba1010 00017004 0004dfb0
 r10:00000036 r9:84c3e9c0 r8:80200288 r7:00000036 r6:0014c2b8 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..