------------[ cut here ]------------
WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x294/0x2e8 mm/highmem.c:622, CPU#1: syz.1.486/4981
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 4981 Comm: syz.1.486 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)
 r7:82283bb8 r6:83ec5400 r5:00000000 r4:8229596c
[<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)
 r7:804d0480
[<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 r1:8227c120 r0:82283bb8
[<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 r7:822b05d4 r6:dfc2dc34 r5:83ec5400 r4:00000000
[<8025233c>] (warn_slowpath_fmt) from [<804d0480>] (kunmap_local_indexed+0x294/0x2e8 mm/highmem.c:622)
 r10:8280ca28 r9:dfc2dd68 r8:20200000 r7:ffedd000 r6:00000001 r5:83ec5400
 r4:ffedd000
[<804d01ec>] (kunmap_local_indexed) from [<80534e58>] (__kunmap_local include/linux/highmem-internal.h:102 [inline])
[<804d01ec>] (kunmap_local_indexed) from [<80534e58>] (break_ksm_pmd_entry+0x168/0x270 mm/ksm.c:653)
 r7:ffedd000 r6:20200000 r5:00000000 r4:00000000
[<80534cf0>] (break_ksm_pmd_entry) from [<804e9f0c>] (walk_pmd_range mm/pagewalk.c:130 [inline])
[<80534cf0>] (break_ksm_pmd_entry) from [<804e9f0c>] (walk_pud_range mm/pagewalk.c:224 [inline])
[<80534cf0>] (break_ksm_pmd_entry) from [<804e9f0c>] (walk_p4d_range mm/pagewalk.c:262 [inline])
[<80534cf0>] (break_ksm_pmd_entry) from [<804e9f0c>] (walk_pgd_range+0x3dc/0x63c mm/pagewalk.c:303)
 r10:81c1f3c4 r9:20000000 r8:dfc2dd68 r7:80534cf0 r6:85da9800 r5:20200000
 r4:20400000
[<804e9b30>] (walk_pgd_range) from [<804ea1b0>] (__walk_page_range+0x44/0x64 mm/pagewalk.c:410)
 r10:8291822c r9:82ad0df8 r8:81c1f3c4 r7:20400000 r6:20000000 r5:dfc2dd68
 r4:85d75f00
[<804ea16c>] (__walk_page_range) from [<804ea894>] (walk_page_range_vma_unsafe+0xb4/0x24c mm/pagewalk.c:714)
 r9:82ad0df8 r8:84eebd0c r7:81c1f3c4 r6:20400000 r5:20000000 r4:85d75f00
[<804ea7e0>] (walk_page_range_vma_unsafe) from [<804eaa58>] (walk_page_range_vma+0x2c/0x34 mm/pagewalk.c:724)
 r7:dfc2ddcc r6:20400000 r5:81c1f3c4 r4:85d75f00
[<804eaa2c>] (walk_page_range_vma) from [<80533c9c>] (break_ksm+0x5c/0x9c mm/ksm.c:703)
[<80533c40>] (break_ksm) from [<80536df4>] (unmerge_and_remove_all_rmap_items mm/ksm.c:1223 [inline])
[<80533c40>] (break_ksm) from [<80536df4>] (run_store+0x2fc/0x3bc mm/ksm.c:3538)
 r7:00000002 r6:81e8bba4 r5:84eebc00 r4:84c85018
[<80536af8>] (run_store) from [<81a88d70>] (kobj_attr_store+0x1c/0x28 lib/kobject.c:840)
 r10:85cbe610 r9:00000000 r8:833c8140 r7:85e96780 r6:81e8bba4 r5:81a88d54
 r4:80536af8
[<81a88d54>] (kobj_attr_store) from [<8063ac5c>] (sysfs_kf_write+0x70/0x7c fs/sysfs/file.c:142)
 r5:81a88d54 r4:00000002
[<8063abec>] (sysfs_kf_write) from [<80638f18>] (kernfs_fop_write_iter+0x118/0x218 fs/kernfs/file.c:352)
 r9:00000000 r8:00000002 r7:dfc2df08 r6:00000002 r5:85cbe600 r4:85e96780
[<80638e00>] (kernfs_fop_write_iter) from [<8056b000>] (new_sync_write fs/read_write.c:593 [inline])
[<80638e00>] (kernfs_fop_write_iter) from [<8056b000>] (vfs_write+0x274/0x44c fs/read_write.c:686)
 r10:81c27144 r9:200000c0 r8:dfc2df68 r7:83ec5400 r6:00000002 r5:85d7ea80
 r4:80638e00
[<8056ad8c>] (vfs_write) from [<8056b348>] (ksys_write+0x74/0xe8 fs/read_write.c:738)
 r10:00000004 r9:83ec5400 r8:8020029c r7:00000000 r6:00000002 r5:85d7ea80
 r4:85d7ea83
[<8056b2d4>] (ksys_write) from [<8056b3cc>] (__do_sys_write fs/read_write.c:749 [inline])
[<8056b2d4>] (ksys_write) from [<8056b3cc>] (sys_write+0x10/0x14 fs/read_write.c:746)
 r7:00000004 r6:00316310 r5:00000000 r4:00000000
[<8056b3bc>] (sys_write) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfc2dfa8 to 0xdfc2dff0)
dfa0:                   00000000 00000000 00000003 200000c0 00000002 00000000
dfc0: 00000000 00000000 00316310 00000004 00300000 00000000 00006364 76fc20bc
dfe0: 76fc1ec0 76fc1eb0 0001929c 00132320
Rebooting in 86400 seconds..