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Message-ID: <0000000000002769a90570394450@google.com>
Date: Wed, 04 Jul 2018 21:49:02 -0700
From: syzbot <syzbot+eb366f9430d25498f0f6@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: KASAN: stack-out-of-bounds Read in move_expired_inodes
Hello,
syzbot found the following crash on:
HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17d35aa4400000
kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
dashboard link: https://syzkaller.appspot.com/bug?extid=eb366f9430d25498f0f6
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=149e9e0c400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17464278400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+eb366f9430d25498f0f6@...kaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: stack-out-of-bounds in move_expired_inodes+0xcb5/0xd80
fs/fs-writeback.c:1120
Read of size 8 at addr ffff8801a802c750 by task kworker/u4:4/849
CPU: 0 PID: 849 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
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
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
move_expired_inodes+0xcb5/0xd80 fs/fs-writeback.c:1120
queue_io+0x309/0x860 fs/fs-writeback.c:1169
wb_writeback+0xaf9/0xf80 fs/fs-writeback.c:1761
wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
wb_do_writeback fs/fs-writeback.c:1920 [inline]
wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949
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 2170490192:
BUG: unable to handle kernel paging request at ffffffff8c430958
PGD 8e6d067 P4D 8e6d067 PUD 8e6e063 PMD 0
Oops: 0000 [#1] SMP KASAN
CPU: 0 PID: 849 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201
Code: e8 65 30 47 fe e9 b3 fd ff ff e8 5b 30 47 fe e9 55 fd ff ff 90 90 90
90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 60
09 43 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00
RSP: 0018:ffff8801d7dae930 EFLAGS: 00010006
RAX: 00000000001fffff RBX: ffff8801a802cbb4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801d7dae938 RDI: 0000000000003ff0
RBP: ffff8801d7dae960 R08: ffff8801d7c4e380 R09: ffffed003b5c3ec2
R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: ffff8801a802c400
R13: ffff8801a802c750 R14: ffff8801d3f30e40 R15: ffff8801a802cbb0
FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c430958 CR3: 00000001bb012000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
describe_object mm/kasan/report.c:243 [inline]
print_address_description+0xfb/0x20b mm/kasan/report.c:263
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
move_expired_inodes+0xcb5/0xd80 fs/fs-writeback.c:1120
queue_io+0x309/0x860 fs/fs-writeback.c:1169
wb_writeback+0xaf9/0xf80 fs/fs-writeback.c:1761
PANIC: double fault, error_code: 0x0
CPU: 1 PID: 8116 Comm: syz-executor725 Not tainted 4.18.0-rc3+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
Code: 41
57
41 89
wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
wb_do_writeback fs/fs-writeback.c:1920 [inline]
wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949
process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
cf
41 56
41 55
49 89
fd 41
54 45
89 cc
53 65
4c 8b
34 25
40 ee
01 00
worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
48 83
e4 f0
48 81
ec 60
03 00
00 48
8b
45 10
<89>
94 24
80 00
00 00
kthread+0x345/0x410 kernel/kthread.c:240
48 ba
00 00
00
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
00 00
Modules linked in:
fc ff
df 48
Dumping ftrace buffer:
89 84
(ftrace buffer empty)
24 98
CR2: ffffffff8c430958
RSP: 0018:ffff8800fffffed0 EFLAGS: 00010082
---[ end trace 565e600e75d0194b ]---
RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201
RAX: 0000000000000000 RBX: 1ffff10020000056 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
Code:
RBP: ffff880100000258 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000
e8
R13: ffffffff88f92620 R14: ffff8801cf4343c0 R15: 0000000000000002
FS: 00007f2e19c1b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
65
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800fffffec8 CR3: 0000000008e6a000 CR4: 00000000001406e0
30
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
47
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
fe
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
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