Greetings, I got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-post-kernfs-conversion commit 0f23a4ecfbef2a707ddfd9d8359ae5220c8d76c1 Author: Tejun Heo AuthorDate: Mon Feb 3 14:29:00 2014 -0500 Commit: Tejun Heo CommitDate: Mon Feb 3 14:29:00 2014 -0500 cgroup: remove cgroup->name +---------------------------------------------------------------------------------+--------------+--------------+ | | 7cff430cffc7 | 9cbc6246a800 | +---------------------------------------------------------------------------------+--------------+--------------+ | boot_successes | 54 | 0 | | boot_failures | 6 | 19 | | Kernel_panic-not_syncing:No_working_init_found | 6 | | | backtrace:panic | 6 | | | BUG:unable_to_handle_kernel | 0 | 19 | | BUG:unable_to_handle_kernel_NULL_pointer_dereferenceNULL_pointer_dereference_at | 0 | 19 | | Oops | 0 | 19 | | Oops:DEBUG_PAGEALLOCDEBUG_PAGEALLOC | 0 | 19 | | EIP_is_at_kernfs_path_locked | 0 | 19 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 19 | | backtrace:disk_events_workfn | 0 | 19 | +---------------------------------------------------------------------------------+--------------+--------------+ [ 6.616956] usbcore: registered new interface driver keyspan_pda [ 6.616956] usbcore: registered new interface driver keyspan_pda [ 6.619153] usbserial: USB Serial support registered for Keyspan PDA [ 6.619153] usbserial: USB Serial support registered for Keyspan PDA [ 6.621546] usbserial: USB Serial support registered for Xircom / Entregra PGS - (prerenumeration) [ 6.621546] usbserial: USB Serial support registered for Xircom / Entregra PGS - (prerenumeration) [ 6.625016] driver ftdi-elan [ 6.625016] driver ftdi-elan [ 6.626390] BUG: unable to handle kernel [ 6.626390] BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 0000001c at 0000001c [ 6.628888] IP: [ 6.628888] IP: [] kernfs_path_locked+0x15/0x5c [] kernfs_path_locked+0x15/0x5c [ 6.630640] *pde = 00000000 [ 6.630640] *pde = 00000000 [ 6.631599] Oops: 0000 [#1] [ 6.631599] Oops: 0000 [#1] DEBUG_PAGEALLOCDEBUG_PAGEALLOC [ 6.633000] Modules linked in: [ 6.633000] Modules linked in: [ 6.634124] CPU: 0 PID: 16 Comm: kworker/0:1 Not tainted 3.14.0-rc1-wl-ath-00992-g9cbc624 #2 [ 6.634124] CPU: 0 PID: 16 Comm: kworker/0:1 Not tainted 3.14.0-rc1-wl-ath-00992-g9cbc624 #2 [ 6.635001] Workqueue: events_freezable_power_ disk_events_workfn [ 6.635001] Workqueue: events_freezable_power_ disk_events_workfn [ 6.635001] task: cf4ee000 ti: cf4f0000 task.ti: cf4f0000 [ 6.635001] task: cf4ee000 ti: cf4f0000 task.ti: cf4f0000 [ 6.635001] EIP: 0060:[] EFLAGS: 00010086 CPU: 0 [ 6.635001] EIP: 0060:[] EFLAGS: 00010086 CPU: 0 [ 6.635001] EIP is at kernfs_path_locked+0x15/0x5c [ 6.635001] EIP is at kernfs_path_locked+0x15/0x5c [ 6.635001] EAX: 00000000 EBX: 00000000 ECX: cf4f1c44 EDX: cf4f1bc4 [ 6.635001] EAX: 00000000 EBX: 00000000 ECX: cf4f1c44 EDX: cf4f1bc4 [ 6.635001] ESI: cf4f1c43 EDI: 00000000 EBP: cf4f1b90 ESP: cf4f1b80 [ 6.635001] ESI: cf4f1c43 EDI: 00000000 EBP: cf4f1b90 ESP: cf4f1b80 [ 6.635001] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 [ 6.635001] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 [ 6.635001] CR0: 8005003b CR2: 0000001c CR3: 0172f000 CR4: 00000690 [ 6.635001] CR0: 8005003b CR2: 0000001c CR3: 0172f000 CR4: 00000690 [ 6.635001] Stack: [ 6.635001] Stack: [ 6.635001] cf4f1bc4 [ 6.635001] cf4f1bc4 00000000 00000000 00000092 00000092 00000000 00000000 cf4f1ba8 cf4f1ba8 c10ef474 c10ef474 cf4f1bc4 cf4f1bc4 00000080 00000080 [ 6.635001] ce697a58 [ 6.635001] ce697a58 00000040 00000040 cf4f1c50 cf4f1c50 c122f801 c122f801 cf4ee438 cf4ee438 cf4ee000 cf4ee000 00000001 00000001 ce64a1f8 ce64a1f8 [ 6.635001] ce697a18 [ 6.635001] ce697a18 00000001 00000001 00000046 00000046 ce697a18 ce697a18 00000000 00000000 c1c311e8 c1c311e8 cf4f1c74 cf4f1c74 c122eebb c122eebb [ 6.635001] Call Trace: [ 6.635001] Call Trace: [ 6.635001] [] kernfs_path+0x29/0x3f [ 6.635001] [] kernfs_path+0x29/0x3f [ 6.635001] [] cfq_find_alloc_queue+0x2d7/0x381 [ 6.635001] [] cfq_find_alloc_queue+0x2d7/0x381 git bisect start 9cbc6246a8001debc81dd3ccf8636ebe0348ffcc 38dbfb59d1175ef458d006556061adeaa8751b72 -- git bisect good d5ee1c1d299197f6625747f7cc7a96124722e104 # 19:15 19+ 19 Merge 'spi/fix/nuc900' into devel-hourly-2014020521 git bisect bad 6a85ae334d8dd720f2fc34aab76fd643074a0e59 # 19:46 0- 2 Merge 'usb/usb-linus' into devel-hourly-2014020521 git bisect good e41ba5b60e23bebb480c4a07de940c9db2111e08 # 20:21 20+ 20 Merge 'arm-perf/misc-patches' into devel-hourly-2014020521 git bisect good ec9f9cb128e86f1d12deb4922621c123cb37b4f7 # 20:57 20+ 20 Merge 'drm-intel/drm-intel-nightly' into devel-hourly-2014020521 git bisect bad 7939b799b88d4fbb782a1935169a8ff089c2bfce # 21:38 0- 5 Merge 'asoc/for-next' into devel-hourly-2014020521 git bisect bad 37edb03368ab460ea2fd5099467bd75d7f0dcd01 # 21:58 0- 2 Merge 'cgroup/review-post-kernfs-conversion' into devel-hourly-2014020521 git bisect good 7bac9560a270d2fca5b65893851aa29676db2f4e # 22:55 20+ 0 kernfs: add CONFIG_KERNFS git bisect good c48b4c28016fdf927148616940279291d028cbc2 # 23:21 20+ 0 cgroup: introduce cgroup_ino() git bisect good 044c79a581aa54cd9ba306f74d92fda6621a8ec1 # 23:53 20+ 0 cgroup: remove cftype_set git bisect bad 0f23a4ecfbef2a707ddfd9d8359ae5220c8d76c1 # 00:13 0- 3 cgroup: remove cgroup->name git bisect good 7cff430cffc79be4ca11d90b03fe8fd7feae580f # 00:39 20+ 0 cgroup: make cgroup hold onto its kernfs_node # first bad commit: [0f23a4ecfbef2a707ddfd9d8359ae5220c8d76c1] cgroup: remove cgroup->name git bisect good 7cff430cffc79be4ca11d90b03fe8fd7feae580f # 00:44 60+ 6 cgroup: make cgroup hold onto its kernfs_node git bisect bad 9cbc6246a8001debc81dd3ccf8636ebe0348ffcc # 00:44 0- 19 0day head guard for 'devel-hourly-2014020521' git bisect good ef42c58a5b4b8060a3931aab36bf2b4f81b44afc # 01:53 60+ 60 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 0cc2aa51be9d2f2b001c0e070b2e5cdde89b39f4 # 03:09 60+ 60 Add linux-next specific files for 20140206 Thanks, Fengguang