FYI, we noticed the below changes on https://github.com/0day-ci/linux Waiman-Long/vfs-Use-per-cpu-list-for-SB-s-s_inodes-list/20160302-050444 commit e1ff3aaf031d89c13da1a772bc33b0f3b386629c ("vfs: Use per-cpu list for superblock's inode list") [ 1.258924] Freeing unused kernel memory: 464K (cafc4000 - cb038000) [ 1.260249] Write protecting the kernel text: 3276k [ 1.261246] Write protecting the kernel read-only data: 2272k [ 1.264224] BUG: using smp_processor_id() in preemptible [00000000] code: init/1 [ 1.265370] caller is debug_smp_processor_id+0x12/0x14 [ 1.266172] CPU: 0 PID: 1 Comm: init Not tainted 4.5.0-rc6-00004-ge1ff3aa #2 [ 1.267189] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.268465] 00000000 00000246 c004fd88 cab6d724 00000000 caef9b8c c004fdb8 cab80444 [ 1.269925] caef9b47 caef9b8c caeee200 00000000 c004d0bc 00000001 c004cd80 cb037a3c [ 1.271202] d08dfaf8 000081a4 c004fdc0 cab8046a c004fdd4 cab7d40b d08dfa00 d3075600 [ 1.272475] Call Trace: [ 1.272868] [] dump_stack+0x55/0x6e [ 1.273559] [] check_preemption_disabled+0xb7/0xcb [ 1.274420] [] debug_smp_processor_id+0x12/0x14 [ 1.275224] [] pcpu_list_add+0xf/0x3b [ 1.275894] [] inode_sb_list_add+0x19/0x1b [ 1.276634] [] new_inode+0x14/0x19 [ 1.277314] [] ramfs_get_inode+0x11/0xe7 [ 1.278061] [] ? ramfs_mkdir+0x2b/0x2b [ 1.278793] [] ramfs_mknod+0x19/0x54 [ 1.279434] [] ramfs_create+0x12/0x14 [ 1.280112] [] vfs_create+0x4c/0x6c [ 1.280770] [] path_openat+0x597/0xa39 [ 1.281489] [] ? __this_cpu_preempt_check+0xf/0x11 [ 1.282386] [] do_filp_open+0x31/0x77 [ 1.283075] [] ? put_page+0x30/0x30 [ 1.283713] [] ? __alloc_fd+0x11a/0x124 [ 1.284417] [] do_sys_open+0x54/0xcf [ 1.285129] [] SyS_open+0x18/0x1a [ 1.285835] [] do_syscall_32_irqs_on+0x3e/0x50 [ 1.286631] [] entry_INT80_32+0x2a/0x2a /etc/rcS.d/S00fbsetup: line 3: /sbin/modprobe: No such file or directory Please wait: booting... [ 1.313854] BUG: using smp_processor_id() in preemptible [00000000] code: rc/88 [ 1.314981] caller is debug_smp_processor_id+0x12/0x14 [ 1.315717] CPU: 1 PID: 88 Comm: rc Not tainted 4.5.0-rc6-00004-ge1ff3aa #2 [ 1.316745] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.318107] 00000000 00000246 d03cdcf4 cab6d724 00000001 caef9b8c d03cdd24 cab80444 [ 1.319489] caef9b47 caef9b8c caeee200 00000000 d014a43c 00000058 d014a100 cb03afbc [ 1.320801] d092fbdc d3003ce4 d03cdd2c cab8046a d03cdd40 cab7d40b d092fae4 d014a100 [ 1.322095] Call Trace: [ 1.322471] [] dump_stack+0x55/0x6e [ 1.323143] [] check_preemption_disabled+0xb7/0xcb [ 1.323968] [] debug_smp_processor_id+0x12/0x14 [ 1.324807] [] pcpu_list_add+0xf/0x3b [ 1.325521] [] inode_sb_list_add+0x19/0x1b [ 1.326301] [] new_inode+0x14/0x19 [ 1.326959] [] proc_pid_make_inode+0xf/0x95 [ 1.327703] [] ? oom_score_adj_write+0x150/0x150 [ 1.328517] [] proc_pid_instantiate+0x11/0x98 [ 1.329279] [] proc_pid_lookup+0x5d/0x71 [ 1.329985] [] proc_root_lookup+0x11/0x25 [ 1.330700] [] lookup_real+0x20/0x33 [ 1.331372] [] __lookup_hash+0x2a/0x31 [ 1.332086] [] walk_component+0x6b/0x11f [ 1.332787] [] ? __inode_permission+0x4f/0x7d [ 1.333565] [] ? proc_self_readlink+0x57/0x57 [ 1.334378] [] link_path_walk+0x139/0x359 [ 1.335164] [] ? proc_reg_llseek+0x6e/0x6e [ 1.335920] [] path_lookupat+0x21/0xcb [ 1.336603] [] filename_lookup+0x50/0x99 [ 1.337306] [] ? unuse_pde+0x1d/0x1d [ 1.337965] [] ? simple_attr_release+0x12/0x12 [ 1.338763] [] user_path_at_empty+0x25/0x2c [ 1.339512] [] vfs_fstatat+0x4b/0x7f [ 1.340176] [] vfs_stat+0x13/0x15 [ 1.340863] [] SyS_stat64+0x15/0x29 [ 1.341607] [] ? prepare_exit_to_usermode+0x11/0x8b [ 1.342500] [] do_syscall_32_irqs_on+0x3e/0x50 [ 1.343304] [] entry_INT80_32+0x2a/0x2a [ 1.344078] BUG: using smp_processor_id() in preemptible [00000000] code: rc/88 [ 1.345155] caller is debug_smp_processor_id+0x12/0x14 [ 1.346036] CPU: 1 PID: 88 Comm: rc Not tainted 4.5.0-rc6-00004-ge1ff3aa #2 [ 1.347115] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.348423] 00000000 00000246 d03cdd24 cab6d724 00000001 caef9b8c d03cdd54 cab80444 [ 1.349714] caef9b47 caef9b8c caeee200 00000000 d014a43c 00000058 d014a100 cb03afbc [ 1.350986] d092f9bc cad45200 d03cdd5c cab8046a d03cdd70 cab7d40b d092f8c4 d014a100 [ 1.352254] Call Trace: [ 1.352619] [] dump_stack+0x55/0x6e [ 1.353263] [] check_preemption_disabled+0xb7/0xcb [ 1.354091] [] debug_smp_processor_id+0x12/0x14 [ 1.354896] [] pcpu_list_add+0xf/0x3b [ 1.355557] [] inode_sb_list_add+0x19/0x1b [ 1.356290] [] new_inode+0x14/0x19 [ 1.356924] [] proc_pid_make_inode+0xf/0x95 [ 1.357658] [] proc_pident_instantiate+0x15/0x8b [ 1.358472] [] proc_pident_lookup+0x5a/0x75 [ 1.359247] [] proc_tgid_base_lookup+0xf/0x11 [ 1.360016] [] lookup_real+0x20/0x33 [ 1.360666] [] __lookup_hash+0x2a/0x31 [ 1.361344] [] walk_component+0x6b/0x11f [ 1.362057] [] ? proc_reg_llseek+0x6e/0x6e [ 1.362785] [] path_lookupat+0x61/0xcb [ 1.363457] [] filename_lookup+0x50/0x99 [ 1.364158] [] ? unuse_pde+0x1d/0x1d [ 1.364827] [] ? simple_attr_release+0x12/0x12 [ 1.365596] [] user_path_at_empty+0x25/0x2c [ 1.366351] [] vfs_fstatat+0x4b/0x7f [ 1.367036] [] vfs_stat+0x13/0x15 [ 1.367703] [] SyS_stat64+0x15/0x29 [ 1.368396] [] ? prepare_exit_to_usermode+0x11/0x8b [ 1.369266] [] do_syscall_32_irqs_on+0x3e/0x50 [ 1.370053] [] entry_INT80_32+0x2a/0x2a [ 1.374941] BUG: using smp_processor_id() in preemptible [00000000] code: S03udev/91 [ 1.375593] caller is debug_smp_processor_id+0x12/0x14 [ 1.376010] CPU: 0 PID: 91 Comm: S03udev Not tainted 4.5.0-rc6-00004-ge1ff3aa #2 [ 1.376611] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.377359] 00000000 00000246 d03b3d44 cab6d724 00000000 caef9b8c d03b3d74 cab80444 [ 1.378153] caef9b47 caef9b8c caeee200 00000000 d01443fc 0000005b d01440c0 cb03afbc [ 1.378921] d300311c d3003ce4 d03b3d7c cab8046a d03b3d90 cab7d40b d3003024 d01440c0 [ 1.379648] Call Trace: [ 1.379860] [] dump_stack+0x55/0x6e [ 1.380219] [] check_preemption_disabled+0xb7/0xcb [ 1.380703] [] debug_smp_processor_id+0x12/0x14 [ 1.381160] [] pcpu_list_add+0xf/0x3b [ 1.381563] [] inode_sb_list_add+0x19/0x1b [ 1.382007] [] new_inode+0x14/0x19 [ 1.382392] [] proc_pid_make_inode+0xf/0x95 [ 1.382824] [] ? oom_score_adj_write+0x150/0x150 [ 1.383288] [] proc_pid_instantiate+0x11/0x98 [ 1.383730] [] proc_pid_lookup+0x5d/0x71 [ 1.384121] [] proc_root_lookup+0x11/0x25 [ 1.384531] [] lookup_real+0x20/0x33 [ 1.385051] [] __lookup_hash+0x2a/0x31 [ 1.385668] [] walk_component+0x6b/0x11f [ 1.386320] [] ? __inode_permission+0x4f/0x7d [ 1.387027] [] ? proc_self_readlink+0x57/0x57 [ 1.387722] [] link_path_walk+0x139/0x359 [ 1.388354] [] ? proc_reg_llseek+0x6e/0x6e [ 1.388974] [] path_lookupat+0x21/0xcb [ 1.389557] [] filename_lookup+0x50/0x99 [ 1.390179] [] ? unuse_pde+0x1d/0x1d [ 1.390782] [] ? simple_attr_release+0x12/0x12 [ 1.391493] [] user_path_at_empty+0x25/0x2c [ 1.392178] [] SYSC_faccessat+0x9d/0x16f [ 1.392820] [] SyS_faccessat+0x11/0x13 [ 1.393422] [] do_syscall_32_irqs_on+0x3e/0x50 [ 1.394080] [] entry_INT80_32+0x2a/0x2a [ 1.394773] BUG: using smp_processor_id() in preemptible [00000000] code: S03udev/91 [ 1.395774] caller is debug_smp_processor_id+0x12/0x14 [ 1.396453] CPU: 0 PID: 91 Comm: S03udev Not tainted 4.5.0-rc6-00004-ge1ff3aa #2 [ 1.397423] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.398540] 00000000 00000246 d03b3d74 cab6d724 00000000 caef9b8c d03b3da4 cab80444 [ 1.399629] caef9b47 caef9b8c caeee200 00000000 d01443fc 0000005b d01440c0 cb03afbc [ 1.400773] d08e4e1c cad45200 d03b3dac cab8046a d03b3dc0 cab7d40b d08e4d24 d01440c0 [ 1.401947] Call Trace: [ 1.402284] [] dump_stack+0x55/0x6e [ 1.402867] [] check_preemption_disabled+0xb7/0xcb [ 1.403590] [] debug_smp_processor_id+0x12/0x14 [ 1.404262] [] pcpu_list_add+0xf/0x3b [ 1.404859] [] inode_sb_list_add+0x19/0x1b [ 1.405505] [] new_inode+0x14/0x19 [ 1.406091] [] proc_pid_make_inode+0xf/0x95 [ 1.406777] [] proc_pident_instantiate+0x15/0x8b [ 1.407515] [] proc_pident_lookup+0x5a/0x75 [ 1.408170] [] proc_tgid_base_lookup+0xf/0x11 [ 1.408837] [] lookup_real+0x20/0x33 [ 1.409390] [] __lookup_hash+0x2a/0x31 [ 1.409994] [] walk_component+0x6b/0x11f [ 1.410621] [] ? proc_reg_llseek+0x6e/0x6e [ 1.411295] [] path_lookupat+0x61/0xcb [ 1.411909] [] filename_lookup+0x50/0x99 [ 1.412530] [] ? unuse_pde+0x1d/0x1d [ 1.413087] [] ? simple_attr_release+0x12/0x12 [ 1.413759] [] user_path_at_empty+0x25/0x2c [ 1.414411] [] SYSC_faccessat+0x9d/0x16f [ 1.415071] [] SyS_faccessat+0x11/0x13 [ 1.415695] [] do_syscall_32_irqs_on+0x3e/0x50 [ 1.416378] [] entry_INT80_32+0x2a/0x2a Starting udev [ 1.418942] BUG: using smp_processor_id() in preemptible [00000000] code: awk/92 [ 1.419935] caller is debug_smp_processor_id+0x12/0x14 [ 1.420616] CPU: 0 PID: 92 Comm: awk Not tainted 4.5.0-rc6-00004-ge1ff3aa #2 [ 1.421510] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.422587] 00000000 00000246 d039fd0c cab6d724 00000000 caef9b8c d039fd3c cab80444 [ 1.423729] caef9b47 caef9b8c caeee200 00000000 d014a43c 0000005c d014a100 cb03afbc [ 1.424909] d092fbdc d3003ce4 d039fd44 cab8046a d039fd58 cab7d40b d092fae4 d014a100 [ 1.426082] Call Trace: [ 1.426404] [] dump_stack+0x55/0x6e [ 1.426965] [] check_preemption_disabled+0xb7/0xcb [ 1.427667] [] debug_smp_processor_id+0x12/0x14 [ 1.428361] [] pcpu_list_add+0xf/0x3b [ 1.428972] [] inode_sb_list_add+0x19/0x1b [ 1.429638] [] new_inode+0x14/0x19 [ 1.430223] [] proc_pid_make_inode+0xf/0x95 [ 1.430896] [] ? oom_score_adj_write+0x150/0x150 [ 1.431603] [] proc_pid_instantiate+0x11/0x98 [ 1.432309] [] proc_pid_lookup+0x5d/0x71 [ 1.432946] [] proc_root_lookup+0x11/0x25 [ 1.433575] [] lookup_real+0x20/0x33 [ 1.434136] [] __lookup_hash+0x2a/0x31 [ 1.434730] [] walk_component+0x6b/0x11f [ 1.435142] [] ? __inode_permission+0x4f/0x7d [ 1.435585] [] ? proc_self_readlink+0x57/0x57 [ 1.436055] [] link_path_walk+0x139/0x359 [ 1.436489] [] ? proc_reg_llseek+0x6e/0x6e [ 1.436940] [] path_openat+0x199/0xa39 [ 1.437334] [] ? lock_release+0xf8/0x25e [ 1.437750] [] do_filp_open+0x31/0x77 [ 1.438122] [] ? unuse_pde+0x1d/0x1d Thanks, Kernel Test Robot