FYI, we noticed the below changes on https://github.com/0day-ci/linux Eric-Sandeen/fanotify-pre-approve-listener-s-OPEN_PERM-access-requests/20160127-072258 commit a2227130fa626d64cd3d6184c4a88d5565572c29 ("fanotify: pre-approve listener's OPEN_PERM access requests") [ 281.525813] tun: (C) 1999-2004 Max Krasnyansky [ 281.599228] EXT4-fs (loop0): mounting ext2 file system using the ext4 subsystem [ 281.599909] EXT4-fs (loop0): mounted filesystem without journal. Opts: (null) [ 281.656253] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 281.656258] IP: [] fanotify_handle_event+0xa1/0x3b0 [ 281.656259] PGD 9a5ea067 PUD 98f11067 PMD 0 [ 281.656260] Oops: 0000 [#1] SMP [ 281.656274] Modules linked in: tun loop rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver netconsole sg sr_mod cdrom sd_mod dcdbas ata_generic coretemp pata_acpi i7core_edac dell_smm_hwmon kvm_intel kvm irqbypass ata_piix crc32c_intel serio_raw pcspkr edac_core snd_hda_codec_realtek libata usb_storage snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep firewire_ohci snd_pcm firewire_core snd_timer crc_itu_t snd soundcore shpchp acpi_cpufreq broadcom bcm_phy_lib [ 281.656276] CPU: 6 PID: 12247 Comm: fanotify01 Not tainted 4.5.0-rc1-00001-ga222713 #2 [ 281.656276] Hardware name: Dell Inc. Studio XPS 8000/0X231R, BIOS A01 08/11/2009 [ 281.656277] task: ffff8800970fc880 ti: ffff880098648000 task.ti: ffff880098648000 [ 281.656279] RIP: 0010:[] [] fanotify_handle_event+0xa1/0x3b0 [ 281.656280] RSP: 0018:ffff88009864bda8 EFLAGS: 00010246 [ 281.656281] RAX: 0000000000400001 RBX: ffff88009881c410 RCX: 0000000000000000 [ 281.656281] RDX: 000000000000003b RSI: ffff88013da87b48 RDI: ffff88009a7f0000 [ 281.656282] RBP: ffff88009864be18 R08: 0000000000000020 R09: ffff88009881c410 [ 281.656282] R10: ffff88013da87b48 R11: 0000000000000020 R12: 0000000000000000 [ 281.656283] R13: ffff88009a7f0000 R14: 0000000000000020 R15: 0000000000000000 [ 281.656284] FS: 00007f5df6c18700(0000) GS:ffff88013fd80000(0000) knlGS:0000000000000000 [ 281.656284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 281.656285] CR2: 0000000000000008 CR3: 000000009a537000 CR4: 00000000000006e0 [ 281.656285] Stack: [ 281.656287] 0000000000000008 ffff88009864befc 0000000000000001 000000000000005d [ 281.656288] 0000000000000000 ffff88009864bee0 ffffffff81203d62 ffff88009a914920 [ 281.656289] ffff880128f1b480 0000000000000000 ffff88013d876be0 ffff88013d876c08 [ 281.656289] Call Trace: [ 281.656293] [] ? do_filp_open+0x92/0xe0 [ 281.656294] [] fsnotify+0x378/0x490 [ 281.656295] [] ? getname_flags+0x56/0x1f0 [ 281.656298] [] ? kmem_cache_alloc+0x197/0x200 [ 281.656300] [] do_sys_open+0x179/0x1f0 [ 281.656301] [] SyS_open+0x1e/0x20 [ 281.656304] [] entry_SYSCALL_64_fastpath+0x12/0x71 [ 281.656316] Code: 95 c0 4d 85 e4 0f 95 c2 84 c0 0f 84 25 02 00 00 84 d2 0f 84 fc 01 00 00 41 8b 47 40 41 0b 44 24 40 41 8b 17 41 0b 14 24 41 89 c7 <49> 8b 44 24 08 48 8b 80 08 01 00 00 48 85 c0 74 42 8b 40 30 85 [ 281.656317] RIP [] fanotify_handle_event+0xa1/0x3b0 [ 281.656317] RSP [ 281.656318] CR2: 0000000000000008 [ 281.656319] ---[ end trace 3422bb7dccb165e4 ]--- [ 281.656320] Kernel panic - not syncing: Fatal exception 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, Ying Huang