Re: WARNING: ODEBUG bug in exit_to_user_mode_prepare

[Dmitry Vyukov]

On Fri, Aug 28, 2020 at 5:08 PM syzbot
<syzbot+fbd7ba7207767ed15165@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    d012a719 Linux 5.9-rc2
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15e9e90e900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=978db74cb30aa994
> dashboard link: https://syzkaller.appspot.com/bug?extid=fbd7ba7207767ed15165
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12f81666900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15abb10e900000
>
> The issue was bisected to:
>
> commit a9ed4a6560b8562b7e2e2bed9527e88001f7b682
> Author: Marc Zyngier <maz@xxxxxxxxxx>
> Date:   Wed Aug 19 16:12:17 2020 +0000
>
>     epoll: Keep a reference on files added to the check list
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=130823a9900000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=108823a9900000
> console output: https://syzkaller.appspot.com/x/log.txt?x=170823a9900000

#syz fix:
fix regression in "epoll: Keep a reference on files added to the check list"

> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+fbd7ba7207767ed15165@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: a9ed4a6560b8 ("epoll: Keep a reference on files added to the check list")
>
> ------------[ cut here ]------------
> ODEBUG: free active (active state 1) object type: rcu_head hint: 0x0
> WARNING: CPU: 1 PID: 10170 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 lib/debugobjects.c:485
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 10170 Comm: syz-executor403 Not tainted 5.9.0-rc2-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+0x20/0x4a kernel/panic.c:600
>  report_bug+0x1bd/0x210 lib/bug.c:198
>  handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
>  exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
>  asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
> RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:485
> Code: dd e0 26 94 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd e0 26 94 88 48 c7 c7 40 1c 94 88 e8 82 3b a6 fd <0f> 0b 83 05 83 54 13 07 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
> RSP: 0018:ffffc9000dabfdd0 EFLAGS: 00010082
> RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
> RDX: ffff888093ada540 RSI: ffffffff815dafc7 RDI: fffff52001b57fac
> RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ae720f8b
> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89bd6780
> R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000
>  __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
>  debug_check_no_obj_freed+0x301/0x41c lib/debugobjects.c:998
>  kmem_cache_free.part.0+0x16d/0x1f0 mm/slab.c:3692
>  task_work_run+0xdd/0x190 kernel/task_work.c:141
>  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
>  exit_to_user_mode_loop kernel/entry/common.c:140 [inline]
>  exit_to_user_mode_prepare+0x195/0x1c0 kernel/entry/common.c:167
>  syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:242
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x447849
> Code: e8 9c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 04 fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007f37799a7db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9
> RAX: 0000000000000000 RBX: 00000000006ddc68 RCX: 0000000000447849
> RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004
> RBP: 00000000006ddc60 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000020000000 R11: 0000000000000246 R12: 00000000006ddc6c
> R13: 00007ffcdbf7f6bf R14: 00007f37799a89c0 R15: 0000000000000000
> Shutting down cpus with NMI
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This report 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@xxxxxxxxxxxxxxxx.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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