Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master commit 23c405912b881e3ca516554efde852c2ad550b31 Author: Sudip Mukherjee <sudipm.mukherjee(a)gmail.com&gt; AuthorDate: Mon Jun 15 20:05:50 2015 +0530 Commit: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; CommitDate: Wed Jul 22 21:15:49 2015 -0700 parport: fix memory leak After the reference count becomes 0 when put_device() is called, it will execute the release callback where we are freeing all the allocated memory associated with the device. We missed freeing par_dev->state. Signed-off-by: Sudip Mukherjee <sudip(a)vectorindia.org&gt; Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; +------------------------------------------------+------------+------------+------------+ | | cabea69587 | 23c405912b | 204364c4be | +------------------------------------------------+------------+------------+------------+ | boot_successes | 88 | 0 | 0 | | boot_failures | 10 | 34 | 39 | | IP-Config:Auto-configuration_of_network_failed | 10 | | | | BUG:unable_to_handle_kernel | 0 | 34 | 38 | | Oops | 0 | 34 | 38 | | EIP_is_at_kstrdup | 0 | 34 | 38 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 34 | 38 | | backtrace:device_add | 0 | 34 | 38 | | backtrace:iio_dummy_evgen_init | 0 | 34 | 38 | | backtrace:kernel_init_freeable | 0 | 34 | 38 | | BUG:kernel_boot_crashed | 0 | 0 | 1 | +------------------------------------------------+------------+------------+------------+ [ 4.851192] panel: could not claim access to parport0. Aborting. [ 4.852351] panel: driver version 0.9.5 not yet registered [ 4.852351] panel: driver version 0.9.5 not yet registered [ 4.853465] BUG: unable to handle kernel [ 4.853465] BUG: unable to handle kernel paging requestpaging request at 5f6f6969 at 5f6f6969 [ 4.854608] IP: [ 4.854608] IP: [<810d6996>] kstrdup+0x2e/0x3c [<810d6996>] kstrdup+0x2e/0x3c [ 4.855413] *pdpt = 0000000000000000 [ 4.855413] *pdpt = 0000000000000000 *pde = 0000000000000000 *pde = 0000000000000000 [ 4.856457] Oops: 0002 [#1] [ 4.856457] Oops: 0002 [#1] SMP SMP DEBUG_PAGEALLOC DEBUG_PAGEALLOC [ 4.857314] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0-rc3-00002-g23c4059 #3 [ 4.857314] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0-rc3-00002-g23c4059 #3 [ 4.858643] task: 80038000 ti: 80034000 task.ti: 80034000 [ 4.858643] task: 80038000 ti: 80034000 task.ti: 80034000 [ 4.859596] EIP: 0060:[<810d6996>] EFLAGS: 00010206 CPU: 0 [ 4.859596] EIP: 0060:[<810d6996>] EFLAGS: 00010206 CPU: 0 [ 4.860566] EIP is at kstrdup+0x2e/0x3c [ 4.860566] EIP is at kstrdup+0x2e/0x3c [ 4.861241] EAX: 00000000 EBX: 0000000a ECX: 0000000a EDX: 5f6f6969 [ 4.861241] EAX: 00000000 EBX: 0000000a ECX: 0000000a EDX: 5f6f6969 [ 4.862338] ESI: 8e68fd70 EDI: 5f6f6969 EBP: 80035e50 ESP: 80035e44 [ 4.862338] ESI: 8e68fd70 EDI: 5f6f6969 EBP: 80035e50 ESP: 80035e44 [ 4.863443] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 4.863443] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 4.864387] CR0: 80050033 CR2: 5f6f6969 CR3: 0254f000 CR4: 000406b0 [ 4.864387] CR0: 80050033 CR2: 5f6f6969 CR3: 0254f000 CR4: 000406b0 [ 4.865485] Stack: [ 4.865485] Stack: [ 4.865847] 0000a1ff [ 4.865847] 0000a1ff 801d9840 801d9840 0000a1ff 0000a1ff 80035e58 80035e58 810d69ba 810d69ba 80035e70 80035e70 81143a22 81143a22 800950c0 800950c0 [ 4.867317] 0000a1ff [ 4.867317] 0000a1ff 801d9840 801d9840 801d9840 801d9840 80035e88 80035e88 811446ca 811446ca 00000004 00000004 8e68fd70 8e68fd70 8e68fd70 8e68fd70 [ 4.868790] 8e6d6480 [ 4.868790] 8e6d6480 80035ea0 80035ea0 81145a5b 81145a5b 00000004 00000004 8e68fd70 8e68fd70 8e6d6480 8e6d6480 8234b568 8234b568 80035eb8 80035eb8 [ 4.870255] Call Trace: [ 4.870255] Call Trace: [ 4.870701] [<810d69ba>] kstrdup_const+0x16/0x18 [ 4.870701] [<810d69ba>] kstrdup_const+0x16/0x18 [ 4.871535] [<81143a22>] __kernfs_new_node+0x18/0x94 [ 4.871535] [<81143a22>] __kernfs_new_node+0x18/0x94 [ 4.872427] [<811446ca>] kernfs_new_node+0x20/0x3a [ 4.872427] [<811446ca>] kernfs_new_node+0x20/0x3a [ 4.873282] [<81145a5b>] kernfs_create_link+0x16/0x56 [ 4.873282] [<81145a5b>] kernfs_create_link+0x16/0x56 [ 4.874197] [<8114630e>] sysfs_do_create_link_sd+0x4e/0x7e [ 4.874197] [<8114630e>] sysfs_do_create_link_sd+0x4e/0x7e [ 4.875294] [<81146373>] sysfs_create_link+0x26/0x2c [ 4.875294] [<81146373>] sysfs_create_link+0x26/0x2c [ 4.876191] [<8172c908>] bus_add_device+0xa4/0x122 [ 4.876191] [<8172c908>] bus_add_device+0xa4/0x122 [ 4.877060] [<811467d9>] ? sysfs_create_groups+0x1e/0x49 [ 4.877060] [<811467d9>] ? sysfs_create_groups+0x1e/0x49 [ 4.878014] [<8172bc86>] device_add+0x230/0x4ab [ 4.878014] [<8172bc86>] device_add+0x230/0x4ab [ 4.878835] [<814a8861>] ? kobject_set_name_vargs+0x3e/0x49 [ 4.878835] [<814a8861>] ? kobject_set_name_vargs+0x3e/0x49 [ 4.879834] [<823b7d49>] iio_dummy_evgen_init+0xf4/0x101 [ 4.879834] [<823b7d49>] iio_dummy_evgen_init+0xf4/0x101 [ 4.880787] [<823b7c55>] ? iio_dummy_init+0x171/0x171 [ 4.880787] [<823b7c55>] ? iio_dummy_init+0x171/0x171 [ 4.881693] [<82372c91>] do_one_initcall+0x15d/0x16c [ 4.881693] [<82372c91>] do_one_initcall+0x15d/0x16c [ 4.882589] [<823724ef>] ? repair_env_string+0x12/0x54 [ 4.882589] [<823724ef>] ? repair_env_string+0x12/0x54 [ 4.883513] [<81065b64>] ? parse_args+0x18e/0x272 [ 4.883513] [<81065b64>] ? parse_args+0x18e/0x272 [ 4.884358] [<82372d90>] kernel_init_freeable+0xf0/0x172 [ 4.884358] [<82372d90>] kernel_init_freeable+0xf0/0x172 [ 4.885311] [<81c6eeea>] kernel_init+0x8/0xb0 [ 4.885311] [<81c6eeea>] kernel_init+0x8/0xb0 [ 4.886097] [<81c823c1>] ret_from_kernel_thread+0x21/0x30 [ 4.886097] [<81c823c1>] ret_from_kernel_thread+0x21/0x30 [ 4.887061] [<81c6eee2>] ? rest_init+0xaa/0xaa [ 4.887061] [<81c6eee2>] ? rest_init+0xaa/0xaa [ 4.887865] Code: [ 4.887865] Code: 30 30 55 55 89 89 e5 e5 57 57 89 89 d7 d7 56 56 89 89 c6 c6 53 53 e8 e8 df df 90 90 3d 3d 00 00 89 89 fa fa 8b 8b 4d 4d 04 04 8d 8d 58 58 01 01 89 89 d8 d8 e8 e8 5f 5f a6 a6 01 01 00 00 89 89 c2 c2 31 31 c0 c0 85 85 d2 d2 74 74 0d 0d 89 89 d7 d7 89 89 d9 d9 <f3> <f3> a4 a4 89 89 d0 d0 eb eb 03 03 31 31 c0 c0 c3 c3 5b 5b 5e 5e 5f 5f 5d 5d c3 c3 55 55 3d 3d 00 00 50 50 c8 c8 81 81 89 89 [ 4.892030] EIP: [<810d6996>] [ 4.892030] EIP: [<810d6996>] kstrdup+0x2e/0x3ckstrdup+0x2e/0x3c SS:ESP 0068:80035e44 SS:ESP 0068:80035e44 [ 4.893178] CR2: 000000005f6f6969 [ 4.893178] CR2: 000000005f6f6969 [ 4.893776] ---[ end trace 25b877e05368647a ]--- [ 4.893776] ---[ end trace 25b877e05368647a ]--- git bisect start 204364c4be7850933343332164bf6b502cf25847 52721d9d3334c1cb1f76219a161084094ec634dc -- git bisect good 3912000d521c9b22f0cdd85c31cd0074db51720a # 07:38 22+ 5 Merge 'meson/ts/dts-m6-fix' into devel-spot-201507250010 git bisect bad 97e101e2035996a5e066c442fdabbde7cff991ae # 07:38 0- 13 Merge 'renesas/marzen-board-removal-for-v4.3' into devel-spot-201507250010 git bisect bad 8e80e64c1813c5ac8b43a944c085628c97eac590 # 07:38 0- 14 Merge 'chanwoo-extcon/extcon-next' into devel-spot-201507250010 git bisect good 21442d0cbbf146d612cf44689423468b5429853d # 07:41 22+ 7 Merge 'kvm-ppc/kvm-ppc-queue' into devel-spot-201507250010 git bisect good f30d87440a38d52261570ae67efd6f70d05717b7 # 07:43 22+ 6 Merge 'kvm/queue' into devel-spot-201507250010 git bisect bad 5e65d6855070bfb9e3fbd56f40be916c8d3ba2d5 # 07:47 1- 24 Merge 'xhci/for-usb-linus' into devel-spot-201507250010 git bisect good a2d52a24ad81e37d5731efdfebd7321dd36c1965 # 07:53 22+ 1 Merge 'richacl/richacl-2015-07-22' into devel-spot-201507250010 git bisect bad 61c2c945b364ddbd4f4057a3f2724daae09bca41 # 07:55 0- 24 Merge 'char-misc/char-misc-linus' into devel-spot-201507250010 git bisect bad 68d35c7b3b1aa686e3039eb2626bf5e3ea8dbe81 # 07:59 0- 22 parport: fix freeing freed memory git bisect bad 23c405912b881e3ca516554efde852c2ad550b31 # 08:03 0- 7 parport: fix memory leak git bisect good cabea695875e3a07313c205a9753c7416126dfa2 # 08:08 22+ 2 parport: fix error handling # first bad commit: [23c405912b881e3ca516554efde852c2ad550b31] parport: fix memory leak git bisect good cabea695875e3a07313c205a9753c7416126dfa2 # 08:10 66+ 3 parport: fix error handling # extra tests with DEBUG_INFO git bisect bad 23c405912b881e3ca516554efde852c2ad550b31 # 08:19 0- 1 parport: fix memory leak # extra tests on HEAD of linux-devel/devel-spot-201507250010 git bisect bad 204364c4be7850933343332164bf6b502cf25847 # 08:19 0- 39 0day head guard for 'devel-spot-201507250010' # extra tests on tree/branch linux-next/master git bisect bad e8e9cc31b0769f2152a6825560e4005b84b2c768 # 08:25 0- 19 Add linux-next specific files for 20150724 # extra tests with first bad commit reverted # extra tests on tree/branch linus/master git bisect good 33b40178cb3bd75294d1a758b3f509a0d38682ab # 08:51 66+ 2 Merge branch 'for-linus' of git://git.kernel.dk/linux-block # extra tests on tree/branch linux-next/master git bisect bad e8e9cc31b0769f2152a6825560e4005b84b2c768 # 08:51 0- 76 Add linux-next specific files for 20150724 This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 initrd=yocto-minimal-i386.cgz wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd kvm=( qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel $kernel -initrd $initrd -m 256 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation