FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git dm-4.4 commit e817ef9b89e5bbfdb2a67ca9896909f414b2af91 ("dm ioctl: use kvfree() in free_params()") +------------------------------------------+------------+------------+ | | 9e632c9dd3 | e817ef9b89 | +------------------------------------------+------------+------------+ | boot_successes | 14 | 11 | | boot_failures | 0 | 10 | | kernel_BUG_at_mm/slub.c | 0 | 10 | | invalid_opcode:#[##]SMP | 0 | 10 | | RIP:#:[<#>]:#echo_perform[<#>]kfree | 0 | 2 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 9 | | backtrace:do_vfs_ioctl | 0 | 3 | | backtrace:SyS_ioctl | 0 | 10 | | RIP:#:[<#>]rmance>/sys[<#>]kfree | 0 | 1 | | RIP:kfree | 0 | 1 | | RIP:#:[<#>]ufreq/scaling_go[<#>]kfree | 0 | 2 | | RIP:#:[<#>]ance>/sys/devi[<#>]kfree | 0 | 1 | | RIP:#:[<#>]req/scaling_gove[<#>]kfree | 0 | 1 | | RIP:#:[<#>]sys/devices/syst[<#>]kfree | 0 | 1 | +------------------------------------------+------------+------------+ [ 19.514000] ------------[ cut here ]------------ o performance > [ 19.519783] kernel BUG at mm/slub.c:3517! /sys/devices/sys [ 19.527366] invalid opcode: 0000 [#1] SMP tem/cpu/cpu15/cp [ 19.533520] Modules linked in: dm_modufreq/scaling_go rpcsec_gss_krb5 auth_rpcgssvernor 2015-10- nfsv4 dns_resolver07 07:14:27 echo btrfs xor performance > / raid6_pq sr_mod cdrom sgsys/devices/syst sd_mod mgag200em/cpu/cpu2/cpuf ttm drm_kms_helperreq/scaling_gove syscopyarearn or 2015-10-07sysfillrect sysimgblt 07:14:27 echo p fb_sys_fops ahcierformance > /sy libahcis/ devices/systemcoretemp kvm_intel/cpu/cpu3/cpufre i7core_edac snd_pcmq/scaling_govern snd_timer drmor 2015-10-07 0 kvm snd7:14:27 echo per soundcore crc32c_intelformance > /sys/ ipmi_si libatadevices/system/c usb_storagepu /cpu4/cpufreq/edac_core microcodescaling_governor pcspkr shpchp 2015-10-07 07: ipmi_msghandler14:27 echo perfo acpi_cpufreqrmance > /sys/de vices/system/cpu [ 19.607527] CPU: 14 PID: 669 Comm: dmsetup Not tainted 4.3.0-rc3-00005-ge817ef9 #1 /cpu5/cpufreq/sc [ 19.617528] Hardware name: Intel Corporation S5520UR/S5520UR, BIOS S5500.86B.01.00.0050.050620101605 05/06/2010 aling_governor [ 19.630345] task: ffff880356122400 ti: ffff8801dc96c000 task.ti: ffff8801dc96c000 2015-10-07 07:14 [ 19.640252] RIP: 0010:[] :27 echo perform [] kfree+0x12e/0x130 ance > /sys/devi [ 19.651820] RSP: 0018:ffff8801dc96fcc8 EFLAGS: 00010246 ces/system/cpu/c [ 19.659301] RAX: 002fffff80000000 RBX: ffff8801dc96fd28 RCX: 0000000000000131 pu6/cpufreq/scal [ 19.668818] RDX: 000077ff80000000 RSI: ffff8801dc96fd28 RDI: ffff8801dc96fd28 ing_governor 20 [ 19.678335] RBP: ffff8801dc96fce0 R08: 0000000000000004 R09: ffffea0007725bc0 15-10-07 07:14:2 [ 19.687854] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 7 echo performan [ 19.697372] R13: ffffffff8118307a R14: 0000000000000000 R15: 0000000000000000 ce > /sys/device [ 19.706890] FS: 00007f5704b1f800(0000) GS:ffff8801e9bc0000(0000) knlGS:0000000000000000 s/system/cpu/cpu [ 19.717475] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 7/cpufreq/scalin [ 19.725442] CR2: 00007f57047002dc CR3: 00000001dc4bc000 CR4: 00000000000006e0 g_governor 2015 [ 19.734959] Stack: -10-07 07:14:27 [ 19.738757] 00005634dcf70120 0000000000000000echo performance 0000000000000000 ffff8801dc96fcf0 > /sys/devices/ system/cpu/cpu8/ [ 19.751708] ffffffff8118307a ffff8801dc96fe88cpufreq/scaling_ ffffffffa02cd0b8 ffff880356122400governor 2015-1 0-[07 07:14:27 ec 19.764649] ffff8801effdbb08 ffff880356122400ho performance > 0000000000000131 0000000000000131 /sys/devices/sy stem/cpu/cpu9/cp [ 19.777593] Call Trace: ufreq/scaling_go [ 19.781878] [] kvfree+0x2a/0x40 vernor [ 19.788779] [] ctl_ioctl+0x238/0x550 [dm_mod] [ 19.796259] [] dm_ctl_ioctl+0x13/0x20 [dm_mod] [ 19.803641] [] do_vfs_ioctl+0x301/0x560 [ 19.810321] [] ? selinux_file_ioctl+0x50/0xd0 [ 19.817570] [] ? security_file_ioctl+0x43/0x60 [ 19.824926] [] SyS_ioctl+0x79/0x90 [ 19.831119] [] entry_SYSCALL_64_fastpath+0x12/0x71 [ 19.838876] Code: c4 40 74 04 41 8b 71 68 4c 89 cf e8 3d cc fa ff eb 9b 4d 8b 49 30 e9 44 ff ff ff 4c 89 d1 48 89 da 4c 89 ce e8 74 fa ff ff eb 82 <0f> 0b 66 66 66 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 [ 19.861810] RIP [] kfree+0x12e/0x130 [ 19.868281] RSP [ 19.872825] ---[ end trace f5be9e866bcf705a ]--- [ 19.880928] 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