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

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: dc989d2ce2c2 tools: bpftool: don't pass FEATURES_DUMP to l..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13eec9dc400000
kernel config: https://syzkaller.appspot.com/x/.config?x=89129667b46496c3
dashboard link: https://syzkaller.appspot.com/bug?extid=7700e2bdb39076b6645d
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [linux-...@vger.kernel.org tg...@linutronix.de]

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7700e2...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: stack-out-of-bounds in enqueue_task_fair+0x3ab/0x910
kernel/sched/fair.c:5424
Read of size 8 at addr ffff8801aa1fa918 by task blkid/9200
PANIC: double fault, error_code: 0x0

CPU: 0 PID: 9192 Comm: syz-executor3 Not tainted 4.18.0-rc3+ #57
CPU: 1 PID: 9200 Comm: blkid Not tainted 4.18.0-rc3+ #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
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
Call Trace:
Code: 41
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
57 41
89
cf
41
56 41
print_address_description+0x6c/0x20b mm/kasan/report.c:256
55
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
49 89
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
fd
enqueue_task_fair+0x3ab/0x910 kernel/sched/fair.c:5424
41
54
45 89
cc 53
enqueue_task kernel/sched/core.c:751 [inline]
activate_task+0x123/0x2e0 kernel/sched/core.c:770
65
ttwu_activate kernel/sched/core.c:1659 [inline]
ttwu_do_activate+0xd5/0x1f0 kernel/sched/core.c:1718
4c 8b
ttwu_queue kernel/sched/core.c:1863 [inline]
try_to_wake_up+0x948/0x12b0 kernel/sched/core.c:2076
34
25 40
ee 01
00
48 83
e4
f0
48 81
ec
60
03
00
00 48
wake_up_process+0x10/0x20 kernel/sched/core.c:2149
8b 45
hrtimer_wakeup+0x48/0x60 kernel/time/hrtimer.c:1647
10 <89>
__run_hrtimer kernel/time/hrtimer.c:1398 [inline]
__hrtimer_run_queues+0x3eb/0x10c0 kernel/time/hrtimer.c:1460
94
24
80 00
00 00
48 ba
00 00
00
00 00
fc
ff df
48
89
hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
84 24
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
smp_apic_timer_interrupt+0x165/0x730 arch/x86/kernel/apic/apic.c:1050
98
RSP: 0018:ffff8801a8b54f60 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff1003516aa68 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff8801a8b552e8 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8801aa57fbe0 R11: ffff8801d904acfb R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801d904a580 R15: 0000000000000002
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
FS: 0000000001156940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
</IRQ>
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801a8b54f58 CR3: 00000001d699d000 CR4: 00000000001406f0
RIP: 0033:0x7fa7a88df79d
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000020000000
Code:
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
85


---
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[Dmitry Vyukov]

#syz fix: bpf: sockhash, disallow bpf_tcp_close and update in parallel

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