------------[ cut here ]------------
WARNING: mm/highmem.c:622 at kunmap_local_indexed+0x294/0x2e8 mm/highmem.c:622, CPU#0: syz.1.286/4754
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 4754 Comm: syz.1.286 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)
 r7:82283bc4 r6:859d9800 r5:00000000 r4:82295978
[<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)
 r7:804d04c8
[<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 r1:8227c12c r0:82283bc4
[<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 r7:822b05e0 r6:dfc69c34 r5:859d9800 r4:00000000
[<8025233c>] (warn_slowpath_fmt) from [<804d04c8>] (kunmap_local_indexed+0x294/0x2e8 mm/highmem.c:622)
 r10:8280ca28 r9:dfc69d68 r8:20200000 r7:ffefe000 r6:00000001 r5:859d9800
 r4:ffefe000
[<804d0234>] (kunmap_local_indexed) from [<80534ea0>] (__kunmap_local include/linux/highmem-internal.h:102 [inline])
[<804d0234>] (kunmap_local_indexed) from [<80534ea0>] (break_ksm_pmd_entry+0x168/0x270 mm/ksm.c:653)
 r7:ffefe000 r6:20200000 r5:00000000 r4:00000000
[<80534d38>] (break_ksm_pmd_entry) from [<804e9f54>] (walk_pmd_range mm/pagewalk.c:130 [inline])
[<80534d38>] (break_ksm_pmd_entry) from [<804e9f54>] (walk_pud_range mm/pagewalk.c:224 [inline])
[<80534d38>] (break_ksm_pmd_entry) from [<804e9f54>] (walk_p4d_range mm/pagewalk.c:262 [inline])
[<80534d38>] (break_ksm_pmd_entry) from [<804e9f54>] (walk_pgd_range+0x3dc/0x63c mm/pagewalk.c:303)
 r10:81c1f3c4 r9:20000000 r8:dfc69d68 r7:80534d38 r6:85f82800 r5:20200000
 r4:20400000
[<804e9b78>] (walk_pgd_range) from [<804ea1f8>] (__walk_page_range+0x44/0x64 mm/pagewalk.c:410)
 r10:8291822c r9:82ad0df8 r8:81c1f3c4 r7:20400000 r6:20000000 r5:dfc69d68
 r4:84b92b00
[<804ea1b4>] (__walk_page_range) from [<804ea8dc>] (walk_page_range_vma_unsafe+0xb4/0x24c mm/pagewalk.c:714)
 r9:82ad0df8 r8:84df668c r7:81c1f3c4 r6:20400000 r5:20000000 r4:84b92b00
[<804ea828>] (walk_page_range_vma_unsafe) from [<804eaaa0>] (walk_page_range_vma+0x2c/0x34 mm/pagewalk.c:724)
 r7:dfc69dcc r6:20400000 r5:81c1f3c4 r4:84b92b00
[<804eaa74>] (walk_page_range_vma) from [<80533ce4>] (break_ksm+0x5c/0x9c mm/ksm.c:703)
[<80533c88>] (break_ksm) from [<80536e3c>] (unmerge_and_remove_all_rmap_items mm/ksm.c:1223 [inline])
[<80533c88>] (break_ksm) from [<80536e3c>] (run_store+0x2fc/0x3bc mm/ksm.c:3538)
 r7:00000002 r6:81e8bba4 r5:84df6580 r4:84d8d018
[<80536b40>] (run_store) from [<81a88e90>] (kobj_attr_store+0x1c/0x28 lib/kobject.c:840)
 r10:85ece290 r9:00000000 r8:830d1d40 r7:83937480 r6:81e8bba4 r5:81a88e74
 r4:80536b40
[<81a88e74>] (kobj_attr_store) from [<8063acac>] (sysfs_kf_write+0x70/0x7c fs/sysfs/file.c:142)
 r5:81a88e74 r4:00000002
[<8063ac3c>] (sysfs_kf_write) from [<80638f68>] (kernfs_fop_write_iter+0x118/0x218 fs/kernfs/file.c:352)
 r9:00000000 r8:00000002 r7:dfc69f08 r6:00000002 r5:85ece280 r4:83937480
[<80638e50>] (kernfs_fop_write_iter) from [<8056b048>] (new_sync_write fs/read_write.c:593 [inline])
[<80638e50>] (kernfs_fop_write_iter) from [<8056b048>] (vfs_write+0x274/0x44c fs/read_write.c:686)
 r10:81c27144 r9:20000000 r8:dfc69f68 r7:859d9800 r6:00000002 r5:84b94300
 r4:80638e50
[<8056add4>] (vfs_write) from [<8056b390>] (ksys_write+0x74/0xe8 fs/read_write.c:738)
 r10:00000004 r9:859d9800 r8:8020029c r7:00000000 r6:00000002 r5:84b94300
 r4:84b94303
[<8056b31c>] (ksys_write) from [<8056b414>] (__do_sys_write fs/read_write.c:749 [inline])
[<8056b31c>] (ksys_write) from [<8056b414>] (sys_write+0x10/0x14 fs/read_write.c:746)
 r7:00000004 r6:00316310 r5:00000000 r4:00000000
[<8056b404>] (sys_write) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfc69fa8 to 0xdfc69ff0)
9fa0:                   00000000 00000000 00000003 20000000 00000002 00000000
9fc0: 00000000 00000000 00316310 00000004 00300000 00000000 00006364 76f340bc
9fe0: 76f33ec0 76f33eb0 0001929c 00132320
Rebooting in 86400 seconds..