RDX: fffffffffffffe4a RSI: 0000000020000100 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000840 R11: 0000000000000246 R12: 0000000000000015
R13: 00000000004c0f1a R14: 00000000004d0e40 R15: 0000000000000020
==================================================================
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:902 [inline]
BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226
Read of size 4 at addr ffff88019ed68084 by task kworker/u4:4/7369

CPU: 0 PID: 7369 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #127
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+0x1c9/0x2b4 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:902 [inline]
 rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226
 rds_recv_rcvbuf_delta.part.3+0x332/0x3e0 net/rds/recv.c:123
 rds_recv_rcvbuf_delta net/rds/recv.c:382 [inline]
 rds_recv_incoming+0x85a/0x1320 net/rds/recv.c:382
 rds_loop_xmit+0x16a/0x340 net/rds/loop.c:82
 rds_send_xmit+0x1343/0x29c0 net/rds/send.c:355
 rds_send_worker+0x153/0x300 net/rds/threads.c:199
 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 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 21765:
 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:779 [inline]
 copy_process.part.39+0x16b5/0x7220 kernel/fork.c:1641
 copy_process kernel/fork.c:1616 [inline]
 _do_fork+0x291/0x12a0 kernel/fork.c:2099
 __do_sys_clone kernel/fork.c:2206 [inline]
 __se_sys_clone kernel/fork.c:2200 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 21784:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
 free_task_struct kernel/fork.c:162 [inline]
 free_task+0x16e/0x1f0 kernel/fork.c:390
 __put_task_struct+0x2e6/0x620 kernel/fork.c:666
 put_task_struct include/linux/sched/task.h:96 [inline]
 delayed_put_task_struct+0x37f/0x490 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2558 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline]
 rcu_process_callbacks+0xed5/0x1850 kernel/rcu/tree.c:2802
 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288

The buggy address belongs to the object at ffff88019ed68440
 which belongs to the cache task_struct(92:syz3) of size 5952
The buggy address is located 956 bytes to the left of
 5952-byte region [ffff88019ed68440, ffff88019ed69b80)
The buggy address belongs to the page:
page:ffffea00067b5a00 count:1 mapcount:0 mapping:ffff8801aff3a940 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea0006baec08 ffffea00071e5e88 ffff8801aff3a940
raw: 0000000000000000 ffff88019ed68440 0000000100000001 ffff8801b3dd0980
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801b3dd0980

Memory state around the buggy address:
 ffff88019ed67f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88019ed68000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88019ed68080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88019ed68100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88019ed68180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================