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Date: Thu, 9 Nov 2017 09:45:25 +0800 From: kernel test robot <xiaolong.ye@...el.com> To: Vivien Didelot <vivien.didelot@...oirfairelinux.com> Cc: "David S. Miller" <davem@...emloft.net>, Florian Fainelli <f.fainelli@...il.com>, LKML <linux-kernel@...r.kernel.org>, Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org Subject: [lkp-robot] [net] 8e5bf9759a: WARNING:at_lib/refcount.c:#refcount_inc FYI, we noticed the following commit (built with gcc-5): commit: 8e5bf9759a06be2251fa96cfd8b412f1808c62f9 ("net: dsa: simplify tree reference counting") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: boot on test machine: qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -m 360M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-----------------------------------------------------+------------+------------+ | | 49463b7f2d | 8e5bf9759a | +-----------------------------------------------------+------------+------------+ | boot_successes | 12 | 0 | | boot_failures | 4 | 27 | | WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 4 | 4 | | EIP:note_page | 4 | 4 | | WARNING:at_lib/refcount.c:#refcount_inc | 0 | 27 | | EIP:refcount_inc | 0 | 27 | +-----------------------------------------------------+------------+------------+ [ 6.072761] WARNING: CPU: 0 PID: 116 at lib/refcount.c:153 refcount_inc+0x26/0x2b [ 6.073599] CPU: 0 PID: 116 Comm: kworker/0:2 Not tainted 4.14.0-rc7-02139-g8e5bf97 #1 [ 6.074293] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 6.074982] Workqueue: events deferred_probe_work_func [ 6.075461] task: d4720040 task.stack: cc148000 [ 6.075863] EIP: refcount_inc+0x26/0x2b [ 6.076211] EFLAGS: 00210286 CPU: 0 [ 6.076527] EAX: 0000002b EBX: ca9ceab0 ECX: 00000006 EDX: 00000007 [ 6.077083] ESI: fffffff0 EDI: ca9ceab0 EBP: cc149e04 ESP: cc149e00 [ 6.077646] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 6.078132] CR0: 80050033 CR2: 00000000 CR3: 01e3d000 CR4: 000406b0 [ 6.078692] Call Trace: [ 6.078939] dsa_register_switch+0x2aa/0x6e7 [ 6.079332] ? rcu_read_unlock+0x39/0x56 [ 6.079669] dsa_loop_drv_probe+0xad/0xbc [ 6.080144] mdio_probe+0xf/0x14 [ 6.080445] driver_probe_device+0xde/0x1e0 [ 6.080818] __device_attach_driver+0x62/0x6e [ 6.081252] bus_for_each_drv+0x5a/0x64 [ 6.081604] __device_attach+0x61/0x99 [ 6.081968] ? driver_allows_async_probing+0xc/0xc [ 6.082424] device_initial_probe+0xd/0xf [ 6.082788] bus_probe_device+0x22/0x64 [ 6.083141] deferred_probe_work_func+0xd7/0x101 [ 6.083554] process_one_work+0x17b/0x2a1 [ 6.083915] ? process_one_work+0x122/0x2a1 [ 6.084301] process_scheduled_works+0x1e/0x24 [ 6.084726] worker_thread+0x18c/0x213 [ 6.085066] kthread+0xd9/0xdb [ 6.085349] ? process_scheduled_works+0x24/0x24 [ 6.085778] ? __list_del_entry+0x1c/0x1c [ 6.086204] ret_from_fork+0x19/0x24 [ 6.086568] Code: 8b 5d fc c9 c3 55 89 e5 e8 af ff ff ff 84 c0 75 1d 80 3d f5 ab d5 c1 00 75 14 68 a6 03 bb c1 c6 05 f5 ab d5 c1 01 e8 4b 4c e4 ff <0f> ff 58 c9 c3 55 89 e5 53 89 c3 51 8b 02 83 f8 ff 74 3d 89 c1 [ 6.088673] ---[ end trace 94dc4c1366eb2cc9 ]--- 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-rc7-02139-g8e5bf97" of type "text/plain" (112941 bytes) View attachment "job-script" of type "text/plain" (3904 bytes) Download attachment "dmesg.xz" of type "application/x-xz" (17868 bytes)
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