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Date:   Fri, 01 Dec 2017 16:22:00 -0800
From:   syzbot 
Subject: kernel BUG at drivers/android/binder_alloc.c:LINE!

syzkaller has found reproducer for the following crash on  
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See
for information about syzkaller reproducers

binder: 3087:3087 ERROR: BC_REGISTER_LOOPER called without request
binder: 3087:3087 ioctl c0306201 2000dfd0 returned -14
------------[ cut here ]------------
kernel BUG at drivers/android/binder_alloc.c:750!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 1404 Comm: kworker/0:2 Not tainted 4.15.0-rc1+ #203
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: events binder_deferred_func
task: 0000000009b739b6 task.stack: 00000000c1d4442c
RIP: 0010:binder_alloc_deferred_release+0x146/0xa40  
RSP: 0018:ffff8801d2b16fd8 EFLAGS: 00010293
RAX: ffff8801d2b08080 RBX: ffff8801d7829300 RCX: ffffffff8403b856
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8801d7829330
RBP: ffff8801d2b17138 R08: ffffffff8403b7d9 R09: 1ffffffff0e53001
R10: ffff8801d2b16fc8 R11: ffffffff87489d60 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8801d2b17110 R15: ffff8801d7829310
FS:  0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006d00a8 CR3: 0000000005e25000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  binder_free_proc drivers/android/binder.c:4200 [inline]
  binder_proc_dec_tmpref+0x2f3/0x420 drivers/android/binder.c:1833
  binder_deferred_release drivers/android/binder.c:4858 [inline]
  binder_deferred_func+0xe22/0x12f0 drivers/android/binder.c:4893
  process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2112
  worker_thread+0x223/0x1990 kernel/workqueue.c:2246
  kthread+0x37a/0x440 kernel/kthread.c:238
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441
Code: e8 00 40 6c fd 49 8d 7f 20 49 8d 5f f0 48 89 fa 48 c1 ea 03 42 80 3c  
2a 00 0f 85 84 07 00 00 49 83 7f 20 00 74 a9 e8 da 3f 6c fd <0f> 0b 48 8b  
9d e8 fe ff ff 44 89 a5 bc fe ff ff e8 c5 3f 6c fd
RIP: binder_alloc_deferred_release+0x146/0xa40  
drivers/android/binder_alloc.c:750 RSP: ffff8801d2b16fd8
---[ end trace 616e085d0dbf3c21 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

View attachment "config.txt" of type "text/plain" (126531 bytes)

Download attachment "raw.log" of type "application/octet-stream" (5795 bytes)

View attachment "repro.txt" of type "text/plain" (1636 bytes)

Download attachment "repro.c" of type "application/octet-stream" (9084 bytes)

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