linux-kernel - [lkp-robot] [x86/entry/64] 5f3cb7eb7c: WARNING:suspicious_RCU

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Date:   Tue, 21 Nov 2017 11:16:38 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>, lkp@...org
Subject: [lkp-robot] [x86/entry/64]  5f3cb7eb7c: WARNING:suspicious_RCU_usage


FYI, we noticed the following commit (built with gcc-6):

commit: 5f3cb7eb7ce2d895658c6251fbaa4b59d93d941d ("x86/entry/64: Create a percpu SYSCALL entry trampoline")
https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git x86/entry_stack

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -smp 2 -m 512M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-------------------------------------------------------+------------+------------+
|                                                       | c4b515521d | 5f3cb7eb7c |
+-------------------------------------------------------+------------+------------+
| boot_successes                                        | 10         | 0          |
| boot_failures                                         | 4          | 14         |
| WARNING:possible_circular_locking_dependency_detected | 4          | 6          |
| WARNING:suspicious_RCU_usage                          | 0          | 14         |
| arch/x86/kernel/traps.c:#entry_code_didn't_wake_RCU   | 0          | 14         |
| RIP:rcu_eqs_exit                                      | 0          | 14         |
| WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit            | 0          | 14         |
| WARNING:at_kernel/sched/cputime.c:#get_vtime_delta    | 0          | 14         |
| RIP:get_vtime_delta                                   | 0          | 14         |
+-------------------------------------------------------+------------+------------+



[   11.683695] WARNING: suspicious RCU usage
[   11.684103] 4.14.0-12905-g5f3cb7e #2 Not tainted
[   11.684572] -----------------------------
[   11.684976] arch/x86/kernel/traps.c:289 entry code didn't wake RCU!
[   11.685785] 
[   11.685785] other info that might help us debug this:
[   11.685785] 
[   11.686579] 
[   11.686579] RCU used illegally from idle CPU!
[   11.686579] rcu_scheduler_active = 2, debug_locks = 1
[   11.687646] RCU used illegally from extended quiescent state!
[   11.688228] no locks held by init/1.
[   11.688587] 
[   11.688587] stack backtrace:
[   11.689025] CPU: 1 PID: 1 Comm: init Not tainted 4.14.0-12905-g5f3cb7e #2
[   11.689697] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   11.690515] Call Trace:
[   11.690776]  dump_stack+0xa9/0xf7
[   11.691116]  do_error_trap+0x5a/0x117
[   11.691495]  ? trace_hardirqs_off_caller+0x3b/0x9d
[   11.691975]  ? irq_trace+0x2e/0x32
[   11.692330]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   11.692798]  ? time_hardirqs_off+0x12/0x2d
[   11.693222]  ? trace_hardirqs_off_caller+0x3b/0x9d
[   11.693704]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   11.694176]  ? restore_regs_and_return_to_kernel+0x32/0x32
[   11.694730]  invalid_op+0x1f/0x40
[   11.695074] RIP: 0010:rcu_eqs_exit+0x45/0x9a
[   11.695778] RSP: 0018:ffffc900000fff10 EFLAGS: 00010086
[   11.696484] RAX: 000000000000001d RBX: 0000000000000001 RCX: ffff88000029a040
[   11.697183] RDX: 0000001d0029a040 RSI: ffffffff810ec321 RDI: ffffffff810ea8e9
[   11.697888] RBP: 0000000000000001 R08: 0000000424d37a7e R09: 0000000000000001
[   11.698591] R10: 000000000000037f R11: ffff88000029a040 R12: ffff88000029a040
[   11.699309] R13: 0000000000000000 R14: 0000560473939524 R15: 0000000000001000
[   11.700013]  ? vprintk_func+0x9d/0xa5
[   11.700392]  ? console_unlock+0x4da/0x5cd
[   11.700801]  __context_tracking_exit+0x4d/0x1c0
[   11.701265]  enter_from_user_mode+0x55/0x5a
[   11.701689]  do_syscall_64+0x23/0x96
[   11.702052]  entry_SYSCALL64_slow_path+0x25/0x25
[   11.702522] RIP: 0033:0x7ff2ed2e9e7a
[   11.702882] RSP: 002b:00007fffaa6c90a8 EFLAGS: 00000246 ORIG_RAX: 000000000000000c
[   11.703632] RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007ff2ed2e9e7a
[   11.704339] RDX: 0000000000000000 RSI: 00007ff2ed2ee720 RDI: 0000000000000000
[   11.705039] RBP: 00000000078afbfd R08: 00007fffaa6c9369 R09: 00007fffaa768000
[   11.705746] R10: 000000000000037f R11: 0000000000000246 R12: 00007fffaa6c9379
[   11.706456] R13: 0000000000000000 R14: 0000560473939524 R15: 0000000000001000
[   11.707176] WARNING: CPU: 1 PID: 1 at kernel/rcu/tree.c:962 rcu_eqs_exit+0x45/0x9a
[   11.708231] Modules linked in:
[   11.708547] CPU: 1 PID: 1 Comm: init Not tainted 4.14.0-12905-g5f3cb7e #2
[   11.709216] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   11.710034] task: ffff88000029a040 task.stack: ffffc900000fc000
[   11.710629] RIP: 0010:rcu_eqs_exit+0x45/0x9a
[   11.711166] RSP: 0018:ffffc900000fff10 EFLAGS: 00010086
[   11.711702] RAX: 000000000000001d RBX: 0000000000000001 RCX: ffff88000029a040
[   11.712406] RDX: 0000001d0029a040 RSI: ffffffff810ec321 RDI: ffffffff810ea8e9
[   11.713101] RBP: 0000000000000001 R08: 0000000424d37a7e R09: 0000000000000001
[   11.713805] R10: 000000000000037f R11: ffff88000029a040 R12: ffff88000029a040
[   11.714534] R13: 0000000000000000 R14: 0000560473939524 R15: 0000000000001000
[   11.715237] FS:  0000000000000000(0000) GS:ffff88001c400000(0000) knlGS:0000000000000000
[   11.716026] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.716599] CR2: 00007ff2ed2edf3c CR3: 000000000fc24000 CR4: 00000000000006a0
[   11.717307] Call Trace:
[   11.717569]  __context_tracking_exit+0x4d/0x1c0
[   11.718025]  enter_from_user_mode+0x55/0x5a
[   11.718452]  do_syscall_64+0x23/0x96
[   11.718817]  entry_SYSCALL64_slow_path+0x25/0x25
[   11.719283] RIP: 0033:0x7ff2ed2e9e7a
[   11.719645] RSP: 002b:00007fffaa6c90a8 EFLAGS: 00000246 ORIG_RAX: 000000000000000c
[   11.720394] RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007ff2ed2e9e7a
[   11.721092] RDX: 0000000000000000 RSI: 00007ff2ed2ee720 RDI: 0000000000000000
[   11.721798] RBP: 00000000078afbfd R08: 00007fffaa6c9369 R09: 00007fffaa768000
[   11.722508] R10: 000000000000037f R11: 0000000000000246 R12: 00007fffaa6c9379
[   11.723209] R13: 0000000000000000 R14: 0000560473939524 R15: 0000000000001000
[   11.723911] Code: 01 00 00 00 75 27 83 b8 c4 00 00 00 00 74 1e 80 3d 99 2a 24 01 00 75 15 48 c7 c7 f7 b2 f3 81 c6 05 89 2a 24 01 01 e8 35 ca f9 ff <0f> ff 48 c7 c0 40 0f 1d 00 65 48 03 05 8a cb f0 7e 48 8b 10 48 
[   11.725883] ---[ end trace acb57807445c80ab ]---


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.14.0-12905-g5f3cb7e" of type "text/plain" (101995 bytes)

View attachment "job-script" of type "text/plain" (4044 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (18068 bytes)