------------[ cut here ]------------
WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x294/0x2e8 mm/highmem.c:622, CPU#1: syz.0.139/4233
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 4233 Comm: syz.0.139 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Call trace: 
[<80201a74>] (dump_backtrace) from [<80201b70>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:82283ab8 r6:858f8000 r5:00000000 r4:8229586c
[<80201b58>] (show_stack) from [<8021ee18>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b58>] (show_stack) from [<8021ee18>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021edc4>] (dump_stack_lvl) from [<8021ee58>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a7bd14
[<8021ee40>] (dump_stack) from [<80202648>] (vpanic+0xe0/0x2e8 kernel/panic.c:489)
[<80202568>] (vpanic) from [<80202884>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:626)
 r7:804d04b8
[<80202850>] (panic) from [<802520b0>] (check_panic_on_warn kernel/panic.c:376 [inline])
[<80202850>] (panic) from [<802520b0>] (get_taint+0x0/0x1c kernel/panic.c:371)
 r3:8280c704 r2:00000001 r1:8227c020 r0:82283ab8
[<80252038>] (check_panic_on_warn) from [<80252228>] (__warn+0x94/0x1a4 kernel/panic.c:901)
[<80252194>] (__warn) from [<802524b0>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:928)
 r8:00000009 r7:822b04d4 r6:dfc65d34 r5:858f8000 r4:00000000
[<8025233c>] (warn_slowpath_fmt) from [<804d04b8>] (kunmap_local_indexed+0x294/0x2e8 mm/highmem.c:622)
 r10:8280ca28 r9:dfc65e68 r8:00200000 r7:ffedd000 r6:00000001 r5:858f8000
 r4:ffedd000
[<804d0224>] (kunmap_local_indexed) from [<80534e90>] (__kunmap_local include/linux/highmem-internal.h:102 [inline])
[<804d0224>] (kunmap_local_indexed) from [<80534e90>] (break_ksm_pmd_entry+0x168/0x270 mm/ksm.c:653)
 r7:ffedd000 r6:00200000 r5:00000000 r4:00000000
[<80534d28>] (break_ksm_pmd_entry) from [<804e9f44>] (walk_pmd_range mm/pagewalk.c:130 [inline])
[<80534d28>] (break_ksm_pmd_entry) from [<804e9f44>] (walk_pud_range mm/pagewalk.c:224 [inline])
[<80534d28>] (break_ksm_pmd_entry) from [<804e9f44>] (walk_p4d_range mm/pagewalk.c:262 [inline])
[<80534d28>] (break_ksm_pmd_entry) from [<804e9f44>] (walk_pgd_range+0x3dc/0x63c mm/pagewalk.c:303)
 r10:81c1f394 r9:001ee000 r8:dfc65e68 r7:80534d28 r6:85ed5000 r5:00200000
 r4:002e8000
[<804e9b68>] (walk_pgd_range) from [<804ea1e8>] (__walk_page_range+0x44/0x64 mm/pagewalk.c:410)
 r10:00000000 r9:858f8000 r8:81c1f394 r7:002e8000 r6:001ee000 r5:dfc65e68
 r4:851a4b00
[<804ea1a4>] (__walk_page_range) from [<804ea8cc>] (walk_page_range_vma_unsafe+0xb4/0x24c mm/pagewalk.c:714)
 r9:858f8000 r8:00000000 r7:81c1f394 r6:002e8000 r5:001ee000 r4:851a4b00
[<804ea818>] (walk_page_range_vma_unsafe) from [<804eaa90>] (walk_page_range_vma+0x2c/0x34 mm/pagewalk.c:724)
 r7:dfc65ecc r6:002e8000 r5:81c1f394 r4:851a4b00
[<804eaa64>] (walk_page_range_vma) from [<80533cd4>] (break_ksm+0x5c/0x9c mm/ksm.c:703)
[<80533c78>] (break_ksm) from [<8053494c>] (__ksm_del_vma mm/ksm.c:2850 [inline])
[<80533c78>] (break_ksm) from [<8053494c>] (ksm_del_vmas+0x7c/0x108 mm/ksm.c:2901)
 r7:00000000 r6:00000000 r5:00000043 r4:851a4b00
[<805348d0>] (ksm_del_vmas) from [<805393a0>] (ksm_disable_merge_any+0x2c/0x54 mm/ksm.c:2954)
 r4:85d2c780
[<80539374>] (ksm_disable_merge_any) from [<802705f8>] (__do_sys_prctl kernel/sys.c:2829 [inline])
[<80539374>] (ksm_disable_merge_any) from [<802705f8>] (sys_prctl+0xa14/0xb8c kernel/sys.c:2518)
 r5:00000043 r4:85d2c780
[<8026fbe4>] (sys_prctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfc65fa8 to 0xdfc65ff0)
5fa0:                   00000000 00000000 00000043 00000000 00000000 00000000
5fc0: 00000000 00000000 0031630c 000000ac 00300000 00000000 00006364 76f3e0bc
5fe0: 76f3dec0 76f3deb0 0001929c 00132320
 r10:000000ac r9:858f8000 r8:8020029c r7:000000ac r6:0031630c r5:00000000
 r4:00000000
Rebooting in 86400 seconds..