Message-ID: <000000000000ec1b3805799d0a56@google.com>
Date:   Thu, 01 Nov 2018 09:38:03 -0700
From:   syzbot <syzbot+eab6e18f95a9fe69005e@...kaller.appspotmail.com>
To:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
        namhyung@...nel.org, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com
Subject: general protection fault in delayed_uprobe_remove

Hello,

syzbot found the following crash on:

HEAD commit:    5b7449810ae6 Merge tag 'tag-chrome-platform-for-v4.20' of ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15805e33400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4e8e3fa31e0cc680
dashboard link: https://syzkaller.appspot.com/bug?extid=eab6e18f95a9fe69005e
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1756fca3400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+eab6e18f95a9fe69005e@...kaller.appspotmail.com

8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8497 Comm: syz-executor3 Not tainted 4.19.0+ #91
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:delayed_uprobe_remove+0x6f/0x140 kernel/events/uprobes.c:339
Code: 00 00 00 48 81 fb 80 f0 5f 89 4c 8b 23 49 bd 00 00 00 00 00 fc ff df  
75 2f e9 98 00 00 00 e8 e8 1d e5 ff 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00  
0f 85 91 00 00 00 49 81 fc 80 f0 5f 89 49 8b 04 24
RSP: 0018:ffff8801abd97380 EFLAGS: 00010a02
RAX: 1bd5a00000000020 RBX: ffff8801cb304800 RCX: 1ffff100357b5d54
RDX: 0000000000000000 RSI: ffffffff819a5b18 RDI: ffff8801cb304810
RBP: ffff8801abd973a8 R08: ffff8801abdaeaa0 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801abdae200 R12: dead000000000100
R13: dffffc0000000000 R14: ffff8801cefeb540 R15: 0000000000000000
FS:  0000000001283940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004cc6e0 CR3: 00000001d16cf000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  put_uprobe+0x4d/0x60 kernel/events/uprobes.c:575
  uprobe_unregister+0x56/0x70 kernel/events/uprobes.c:1088
  probe_event_disable.part.16+0x16a/0x2c0 kernel/trace/trace_uprobe.c:990
  probe_event_disable kernel/trace/trace_uprobe.c:1224 [inline]
  trace_uprobe_register+0x52c/0xcf0 kernel/trace/trace_uprobe.c:1223
  perf_trace_event_unreg.isra.3+0xbb/0x220  
kernel/trace/trace_event_perf.c:157
  perf_uprobe_destroy+0xc3/0x130 kernel/trace/trace_event_perf.c:342
  _free_event+0x414/0x1660 kernel/events/core.c:4446
  put_event+0x48/0x60 kernel/events/core.c:4532
  perf_event_release_kernel+0x8d0/0x10e0 kernel/events/core.c:4638
  perf_release+0x37/0x50 kernel/events/core.c:4648
  __fput+0x385/0xa30 fs/file_table.c:278
  ____fput+0x15/0x20 fs/file_table.c:309
  task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
  prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
  do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 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:00007ffda00105b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000730b80 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000730b70 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000033 R15: 0000000000000003
Modules linked in:
---[ end trace 0f8af665f1aa3802 ]---
RIP: 0010:delayed_uprobe_remove+0x6f/0x140 kernel/events/uprobes.c:339
Code: 00 00 00 48 81 fb 80 f0 5f 89 4c 8b 23 49 bd 00 00 00 00 00 fc ff df  
75 2f e9 98 00 00 00 e8 e8 1d e5 ff 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00  
0f 85 91 00 00 00 49 81 fc 80 f0 5f 89 49 8b 04 24
RSP: 0018:ffff8801abd97380 EFLAGS: 00010a02
RAX: 1bd5a00000000020 RBX: ffff8801cb304800 RCX: 1ffff100357b5d54
RDX: 0000000000000000 RSI: ffffffff819a5b18 RDI: ffff8801cb304810
RBP: ffff8801abd973a8 R08: ffff8801abdaeaa0 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801abdae200 R12: dead000000000100
R13: dffffc0000000000 R14: ffff8801cefeb540 R15: 0000000000000000
FS:  0000000001283940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004cc6e0 CR3: 00000001d16cf000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
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