==================================================================
BUG: KASAN: slab-out-of-bounds in hlist_move_list include/linux/list.h:843 [inline]
BUG: KASAN: slab-out-of-bounds in __collect_expired_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: slab-out-of-bounds in collect_expired_timers kernel/time/timer.c:1717 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0x54e/0x7a0 kernel/time/timer.c:1781
Write of size 8 at addr ffff8881e8b131c8 by task ksoftirqd/1/16

CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.93-syzkaller-00590-g1e5f5a14faba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1dd/0x24e lib/dump_stack.c:118
 print_address_description+0x96/0x640 mm/kasan/report.c:374
 __kasan_report+0x177/0x1f0 mm/kasan/report.c:506
 kasan_report+0x30/0x60 mm/kasan/common.c:634
 hlist_move_list include/linux/list.h:843 [inline]
 __collect_expired_timers kernel/time/timer.c:1482 [inline]
 collect_expired_timers kernel/time/timer.c:1717 [inline]
 __run_timers+0x54e/0x7a0 kernel/time/timer.c:1781
 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1798
 __do_softirq+0x30f/0x769 kernel/softirq.c:292
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:603
 smpboot_thread_fn+0x551/0x930 kernel/smpboot.c:165
 kthread+0x31c/0x340 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 25479:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x129/0x1c0 mm/kasan/common.c:510
 __kmalloc+0xe7/0x2d0 mm/slub.c:3863
 kmalloc_array+0x2d/0x50 include/linux/slab.h:618
 kcalloc include/linux/slab.h:629 [inline]
 iter_file_splice_write+0x22d/0xf80 fs/splice.c:690
 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976
 do_splice_direct+0x288/0x3e0 fs/splice.c:1064
 do_sendfile+0x8e4/0x1130 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1519 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x163/0x230 fs/read_write.c:1511
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 25479:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x17e/0x230 mm/kasan/common.c:471
 slab_free_hook mm/slub.c:1453 [inline]
 slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486
 slab_free mm/slub.c:3051 [inline]
 kfree+0x12c/0x660 mm/slub.c:4017
 iter_file_splice_write+0xd40/0xf80 fs/splice.c:773
 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976
 do_splice_direct+0x288/0x3e0 fs/splice.c:1064
 do_sendfile+0x8e4/0x1130 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1519 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x163/0x230 fs/read_write.c:1511
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8881e8b13000
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 200 bytes to the right of
 256-byte region [ffff8881e8b13000, ffff8881e8b13100)
The buggy address belongs to the page:
page:ffffea0007a2c480 refcount:1 mapcount:0 mapping:ffff8881f6002780 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f6002780
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881e8b13080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e8b13100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881e8b13180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                              ^
 ffff8881e8b13200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e8b13280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================