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BUG: KASAN: null-ptr-deref in atomic_sub_return include/asm-generic/atomic-instrumented.h:159 [inline]
BUG: KASAN: null-ptr-deref in atomic_dec_return include/linux/atomic-fallback.h:455 [inline]
BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 net/rxrpc/local_object.c:405
Write of size 4 at addr 0000000000000010 by task syz-executor.3/10669

CPU: 0 PID: 10669 Comm: syz-executor.3 Not tainted 5.3.0-rc4-next-20190812+ #64
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+0x172/0x1f0 lib/dump_stack.c:113
 __kasan_report.cold+0x5/0x36 mm/kasan/report.c:486
 kasan_report+0x12/0x17 mm/kasan/common.c:610
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 __kasan_check_write+0x14/0x20 mm/kasan/common.c:98
 atomic_sub_return include/asm-generic/atomic-instrumented.h:159 [inline]
 atomic_dec_return include/linux/atomic-fallback.h:455 [inline]
 rxrpc_unuse_local+0x23/0x70 net/rxrpc/local_object.c:405
 rxrpc_release_sock net/rxrpc/af_rxrpc.c:904 [inline]
 rxrpc_release+0x47d/0x840 net/rxrpc/af_rxrpc.c:930
 __sock_release+0xce/0x280 net/socket.c:590
 sock_close+0x1e/0x30 net/socket.c:1268
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413511
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffdf654a340 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413511
RDX: 0000001b2bc20000 RSI: 0000000000000dcb RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000002a3c2dcb R09: 000000002a3c2dcf
R10: 00007ffdf654a420 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000761f00 R15: ffffffffffffffff
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