FYI, we noticed the below changes on https://github.com/0day-ci/linux Chris-Wilson/kernfs-Move-faulting-copy_user-operations-outside-of-the-mutex/20160223-194306 commit abb29ac83c6117ea1311b0b0d7bcb24316f907e7 ("kernfs: Move faulting copy_user operations outside of the mutex") +---------------------------------------------+------------+------------+ | | 112d125a89 | abb29ac83c | +---------------------------------------------+------------+------------+ | boot_successes | 23 | 18 | | boot_failures | 0 | 5 | | WARNING:at_fs/sysfs/file.c:#sysfs_kf_read() | 0 | 4 | | backtrace:vfs_read | 0 | 4 | | backtrace:SyS_read | 0 | 4 | | backtrace:__vfs_read | 0 | 1 | | BUG:kernel_test_crashed | 0 | 1 | +---------------------------------------------+------------+------------+ [ 7.695817] ------------[ cut here ]------------ [ 7.696041] md: bind [ 7.696149] ------------[ cut here ]------------ [ 7.696153] WARNING: CPU: 3 PID: 406 at fs/sysfs/file.c:117 sysfs_kf_read+0x75/0x90() [ 7.696166] Modules linked in: sg sr_mod cdrom sd_mod snd_hda_codec_realtek coretemp snd_hda_codec_generic snd_hda_codec_hdmi kvm_intel dcdbas ata_generic pata_acpi ata_piix snd_hda_intel kvm irqbypass snd_hda_codec i7core_edac snd_hda_core crc32c_intel snd_hwdep pcspkr serio_raw edac_core firewire_ohci libata snd_pcm usb_storage firewire_core crc_itu_t snd_timer snd soundcore shpchp acpi_cpufreq broadcom bcm_phy_lib [ 7.696167] CPU: 3 PID: 406 Comm: mdadm Not tainted 4.5.0-rc4-00017-gabb29ac #1 [ 7.696168] Hardware name: Dell Inc. Studio XPS 8000/0X231R, BIOS A01 08/11/2009 [ 7.696170] 0000000000000000 ffff8800a9bbbda8 ffffffff8141e56a 0000000000000000 [ 7.696170] ffffffff81be47f8 ffff8800a9bbbde0 ffffffff81078ec6 0000000000000400 [ 7.696171] ffff8800aa3a6800 ffff8800a9bbbf20 ffff8800aaddc680 00007ffcebaa7c80 [ 7.696172] Call Trace: [ 7.696177] [] dump_stack+0x63/0x89 [ 7.696180] [] warn_slowpath_common+0x86/0xc0 [ 7.696181] [] warn_slowpath_null+0x1a/0x20 [ 7.696182] [] sysfs_kf_read+0x75/0x90 [ 7.696183] [] kernfs_fop_read+0xab/0x160 [ 7.696185] [] __vfs_read+0x28/0xd0 [ 7.696187] [] ? security_file_permission+0xa3/0xc0 [ 7.696188] [] ? rw_verify_area+0x57/0xd0 [ 7.696188] [] vfs_read+0x86/0x130 [ 7.696190] [] SyS_read+0x46/0xa0 [ 7.696192] [] entry_SYSCALL_64_fastpath+0x12/0x6d [ 7.696193] ---[ end trace 2d6d55c322d0a900 ]--- [ 7.698291] md: bind To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Kernel Test Robot