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BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic_dec_return include/asm-generic/atomic-instrumented.h:340 [inline]
BUG: KASAN: use-after-free in rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:141
Write of size 4 at addr ffff888099317f20 by task syz-executor.0/6866

CPU: 0 PID: 6866 Comm: syz-executor.0 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
 instrument_atomic_write include/linux/instrumented.h:71 [inline]
 atomic_dec_return include/asm-generic/atomic-instrumented.h:340 [inline]
 rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:141
 rxrpc_destroy_connection+0x150/0x2f0 net/rxrpc/conn_object.c:367
 rcu_do_batch kernel/rcu/tree.c:2428 [inline]
 rcu_core+0x5ca/0x1130 kernel/rcu/tree.c:2656
 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:write_comp_data+0x2f/0x80 kernel/kcov.c:218
Code: 05 a6 7b 8b 7e 65 48 8b 34 25 c0 fe 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 4c 14 00 00 85 c0 74 4f 8b 86 28 14 00 00 <83> f8 03 75 44 48 8b 86 30 14 00 00 8b b6 2c 14 00 00 4c 8b 00 48
RSP: 0018:ffffc900055678d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88808a7b9950 RCX: ffffffff81d16c35
RDX: 0000000000000000 RSI: ffff8880a96f24c0 RDI: 0000000000000005
RBP: ffff88809c4d61a0 R08: 0000000000000001 R09: ffffffff8d10ba6f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809c4d6180
R13: ffff888089fbb620 R14: dffffc0000000000 R15: 0000000000000000
 prepend_path+0x365/0xb20 fs/d_path.c:128
 d_absolute_path+0xfa/0x180 fs/d_path.c:201
 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline]
 tomoyo_realpath_from_path+0x282/0x620 security/tomoyo/realpath.c:276
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822
 tomoyo_path_unlink+0x8e/0xd0 security/tomoyo/tomoyo.c:150
 security_path_unlink+0xd7/0x150 security/security.c:1100
 do_unlinkat+0x375/0x660 fs/namei.c:3893
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45db77
Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff5bf02478 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045db77
RDX: 00007fff5bf02490 RSI: 00007fff5bf02490 RDI: 00007fff5bf02520
RBP: 0000000000000307 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000246 R12: 00007fff5bf035b0
R13: 0000000002508a60 R14: 0000000000000000 R15: 00007fff5bf035b0

Allocated by task 14274:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 kmem_cache_alloc_trace+0x174/0x300 mm/slab.c:3550
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 rxrpc_alloc_bundle+0x88/0x2c0 net/rxrpc/conn_client.c:121
 rxrpc_look_up_bundle net/rxrpc/conn_client.c:275 [inline]
 rxrpc_prep_call net/rxrpc/conn_client.c:374 [inline]
 rxrpc_connect_call+0x85c/0x1580 net/rxrpc/conn_client.c:710
 rxrpc_new_client_call+0x961/0x1020 net/rxrpc/call_object.c:331
 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:622 [inline]
 rxrpc_do_sendmsg+0xf14/0x136d net/rxrpc/sendmsg.c:679
 rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:560
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 10677:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kfree+0x10e/0x2b0 mm/slab.c:3756
 rxrpc_put_bundle net/rxrpc/conn_client.c:146 [inline]
 rxrpc_put_bundle+0x6b/0x80 net/rxrpc/conn_client.c:138
 rxrpc_unbundle_conn+0x1f8/0x3d0 net/rxrpc/conn_client.c:935
 rxrpc_clean_up_local_conns+0x38d/0x587 net/rxrpc/conn_client.c:1114
 rxrpc_local_destroyer net/rxrpc/local_object.c:399 [inline]
 rxrpc_local_processor+0x38d/0x5e0 net/rxrpc/local_object.c:433
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff888099317f00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 32 bytes inside of
 192-byte region [ffff888099317f00, ffff888099317fc0)
The buggy address belongs to the page:
page:00000000cc983fd6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x99317
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002a47588 ffffea00025d3148 ffff8880aa040000
raw: 0000000000000000 ffff888099317000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888099317e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888099317e80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888099317f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888099317f80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888099318000: 00 00 00 00 00 00 00 00 fc fc fc fc fb fb fb fb
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