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BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:42 [inline]
BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:236 [inline]
BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:897 [inline]
BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x255/0x590 net/rds/cong.c:226
Read of size 4 at addr ffff8801ac410104 by task kworker/u4:5/6669

CPU: 1 PID: 6669 Comm: kworker/u4:5 Not tainted 4.17.0+ #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krdsd rds_send_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
 refcount_read include/linux/refcount.h:42 [inline]
 check_net include/net/net_namespace.h:236 [inline]
 rds_destroy_pending net/rds/rds.h:897 [inline]
 rds_cong_queue_updates+0x255/0x590 net/rds/cong.c:226
 rds_recv_rcvbuf_delta.part.3+0x2b9/0x350 net/rds/recv.c:118
 rds_recv_rcvbuf_delta net/rds/recv.c:377 [inline]
 rds_recv_incoming+0x83f/0x1300 net/rds/recv.c:377
 rds_loop_xmit+0x16a/0x340 net/rds/loop.c:82
 rds_send_xmit+0x131b/0x2990 net/rds/send.c:355
 rds_send_worker+0x142/0x2e0 net/rds/threads.c:199
 process_one_work+0xc64/0x1b70 kernel/workqueue.c:2153
 worker_thread+0x181/0x13a0 kernel/workqueue.c:2296
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

Allocated by task 4578:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644
 alloc_task_struct_node kernel/fork.c:157 [inline]
 dup_task_struct kernel/fork.c:771 [inline]
 copy_process.part.38+0x169d/0x7180 kernel/fork.c:1633
 copy_process kernel/fork.c:1608 [inline]
 _do_fork+0x291/0x12a0 kernel/fork.c:2091
 __do_sys_clone kernel/fork.c:2198 [inline]
 __se_sys_clone kernel/fork.c:2192 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2192
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801ac4104c0
 which belongs to the cache task_struct(65:syz4) of size 5952
The buggy address is located 956 bytes to the left of
 5952-byte region [ffff8801ac4104c0, ffff8801ac411c00)
The buggy address belongs to the page:
page:ffffea0006b10400 count:1 mapcount:0 mapping:ffff8801aa02bc00 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea0006c4dc88 ffffea0007000788 ffff8801aa02bc00
raw: 0000000000000000 ffff8801ac4104c0 0000000100000001 ffff8801cba0c900
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801cba0c900

Memory state around the buggy address:
 ffff8801ac410000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ac410080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801ac410100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801ac410180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ac410200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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