linux-kernel - WARNING in ptrace

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Message-ID: <00000000000069316005ab2306cc@google.com>
Date:   Thu, 23 Jul 2020 15:03:23 -0700
From:   syzbot <syzbot+e7a125aff38791d8cb65@...kaller.appspotmail.com>
To:     christian@...uner.io, davej@...emonkey.org.uk,
        ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        liuzhiqiang26@...wei.com, oleg@...hat.com,
        paul.gortmaker@...driver.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com
Subject: WARNING in ptrace_stop

Hello,

syzbot found the following issue on:

HEAD commit:    92188b41 Merge tag 'perf-tools-fixes-2020-07-19' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=173963eb100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a160d1053fc89af5
dashboard link: https://syzkaller.appspot.com/bug?extid=e7a125aff38791d8cb65
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=178d6017100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1688add7100000

The issue was bisected to:

commit dbfb089d360b1cc623c51a2c7cf9b99eff78e0e7
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Fri Jul 3 10:40:33 2020 +0000

    sched: Fix loadavg accounting race

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14e3af6f100000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=16e3af6f100000
console output: https://syzkaller.appspot.com/x/log.txt?x=12e3af6f100000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e7a125aff38791d8cb65@...kaller.appspotmail.com
Fixes: dbfb089d360b ("sched: Fix loadavg accounting race")

------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=8 set at [<00000000076362f5>] ptrace_stop+0x0/0x9e0 kernel/signal.c:2054
WARNING: CPU: 1 PID: 17054 at kernel/sched/core.c:6883 __might_sleep+0x135/0x190 kernel/sched/core.c:6883
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 17054 Comm: syz-executor692 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:__might_sleep+0x135/0x190 kernel/sched/core.c:6883
Code: 65 48 8b 1c 25 00 ff 01 00 48 8d 7b 10 48 89 fe 48 c1 ee 03 80 3c 06 00 75 2b 48 8b 73 10 48 c7 c7 a0 3f 4b 88 e8 2d 1a f5 ff <0f> 0b e9 46 ff ff ff e8 3f 40 63 00 e9 29 ff ff ff e8 35 40 63 00
RSP: 0018:ffffc9000df87c78 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888095b30000 RCX: 0000000000000000
RDX: ffff888095b30000 RSI: ffffffff815d4eb7 RDI: fffff52001bf0f81
RBP: ffffffff884ab220 R08: 0000000000000001 R09: ffff8880ae7318e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000039
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888095b30488
 try_to_freeze_unsafe include/linux/freezer.h:57 [inline]
 try_to_freeze include/linux/freezer.h:67 [inline]
 freezer_count include/linux/freezer.h:128 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 ptrace_stop+0x4e2/0x9e0 kernel/signal.c:2215
 ptrace_signal kernel/signal.c:2490 [inline]
 get_signal+0xddc/0x1ee0 kernel/signal.c:2639
 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline]
 __prepare_exit_to_usermode+0x156/0x1f0 arch/x86/entry/common.c:269
 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441729
Code: Bad RIP value.
RSP: 002b:00007ffd1cbad2b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000441729
RDX: 0000000080000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000017df84 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402420
R13: 00000000004024b0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This report is generated by a bot. It may contain errors.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
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