syzbot


KASAN: stack-out-of-bounds Read in move_expired_inodes

Status: closed as dup on 2018/07/05 16:19
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+eb366f9430d25498f0f6@syzkaller.appspotmail.com
First crash: 2115d, last: 2115d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: stack-out-of-bounds Read in timerqueue_add kernel C 4 2099d 2115d
Discussions (1)
Title Replies (including bot) Last reply
KASAN: stack-out-of-bounds Read in move_expired_inodes 1 (2) 2018/07/05 16:19

Sample crash report:
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 

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/04 22:55 bpf-next 2bdea157b999 e1b966c6 .config console log report syz C ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.