Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://github.com/0day-ci/linux Sudip-Mukherjee/i2c-i2c-core-do-not-use-bus-internal-data/20160307-195104 commit f3eab4251515a492aa38e515d9a2322c535ce358 Author: Sudip Mukherjee <sudipm.mukherjee(a)gmail.com&gt; AuthorDate: Mon Mar 7 17:19:17 2016 +0530 Commit: 0day robot <fengguang.wu(a)intel.com&gt; CommitDate: Mon Mar 7 19:51:06 2016 +0800 i2c: i2c-core: do not use bus internal data The variable p is a data structure which is used by the driver core internally and it is not expected that busses will be directly accessing these driver core internal only data. Signed-off-by: Sudip Mukherjee <sudip.mukherjee(a)codethink.co.uk&gt; +----------------------------------------------------------------+------------+------------+------------+ | | 3bf58bb5da | f3eab42515 | f3eab42515 | +----------------------------------------------------------------+------------+------------+------------+ | boot_successes | 80 | 0 | 0 | | boot_failures | 2 | 13 | 13 | | BUG:unable_to_handle_kernel | 1 | 13 | 13 | | Oops | 1 | 13 | 13 | | EIP_is_at_perf_callchain | 1 | | | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 1 | | | | backtrace:__ubsan_handle_type_mismatch | 2 | | | | backtrace:late_resume_init | 2 | | | | backtrace:kernel_init_freeable | 2 | 13 | 13 | | backtrace:iterate_dir | 1 | | | | backtrace:SyS_getdents64 | 1 | | | | WARNING:at_arch/x86/include/asm/fpu/internal.h:#fpu__restore() | 1 | | | | WARNING:at_drivers/i2c/i2c-core.c:#i2c_register_driver() | 0 | 13 | 13 | | EIP_is_at_blocking_notifier_chain_register | 0 | 13 | 13 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 13 | 13 | | backtrace:i2c_register_driver | 0 | 13 | 13 | | backtrace:i2c_init | 0 | 13 | 13 | | backtrace:max7300_init | 0 | 13 | 13 | | backtrace:max1586_pmic_init | 0 | 13 | 13 | | backtrace:max8952_pmic_init | 0 | 13 | 13 | | backtrace:tps51632_init | 0 | 13 | 13 | | backtrace:tps_65023_init | 0 | 13 | 13 | | backtrace:pm805_i2c_init | 0 | 13 | 13 | | backtrace:wm#_module_init | 0 | 13 | 13 | | backtrace:wm#x_i2c_init | 0 | 13 | 13 | | backtrace:wm#_i2c_init | 0 | 13 | 13 | | backtrace:tps65912_i2c_init | 0 | 13 | 13 | | backtrace:tps80031_init | 0 | 13 | 13 | | backtrace:max14577_i2c_init | 0 | 13 | 13 | | backtrace:max77843_i2c_init | 0 | 13 | 13 | | backtrace:max8997_i2c_init | 0 | 13 | 13 | | backtrace:max8998_i2c_init | 0 | 13 | 13 | | backtrace:pcf50633_init | 0 | 13 | 13 | | backtrace:tps6586x_init | 0 | 13 | 13 | | backtrace:aat2870_init | 0 | 13 | 13 | | backtrace:palmas_i2c_init | 0 | 13 | 13 | | backtrace:rc5t583_i2c_init | 0 | 13 | 13 | | backtrace:sec_pmic_init | 0 | 13 | 13 | | backtrace:lm#_i2c_init | 0 | 13 | 13 | | backtrace:act8865_pmic_driver_init | 0 | 13 | 13 | | backtrace:ltc3589_driver_init | 0 | 13 | 13 | | backtrace:pv88090_regulator_driver_init | 0 | 13 | 13 | | backtrace:bmp085_i2c_driver_init | 0 | 13 | 13 | | backtrace:apds990x_driver_init | 0 | 13 | 13 | | backtrace:tsl2550_driver_init | 0 | 13 | 13 | | backtrace:eeprom_driver_init | 0 | 13 | 13 | | backtrace:fsa9480_i2c_driver_init | 0 | 13 | 13 | | backtrace:twl_driver_init | 0 | 13 | 13 | | backtrace:twl6040_driver_init | 0 | 13 | 13 | | backtrace:axp20x_i2c_driver_init | 0 | 13 | 13 | | backtrace:da9150_driver_init | 0 | 13 | 13 | | backtrace:rn5t618_i2c_driver_init | 0 | 13 | 13 | | backtrace:sky81452_driver_init | 0 | 13 | 13 | | backtrace:usb#_init | 0 | 13 | 13 | | backtrace:cyapa_driver_init | 0 | 13 | 13 | | backtrace:drv2665_driver_init | 0 | 13 | 13 | | backtrace:drv2667_driver_init | 0 | 13 | 13 | | backtrace:mpu3050_i2c_driver_init | 0 | 13 | 13 | | backtrace:bus_register_notifier | 0 | 13 | 13 | | backtrace:i2c_dev_init | 0 | 13 | 13 | +----------------------------------------------------------------+------------+------------+------------+ [ 1.156740] RTC time: 20:24:25, date: 03/07/16 [ 1.159021] NET: Registered protocol family 16 [ 1.161817] ------------[ cut here ]------------ [ 1.163734] WARNING: CPU: 0 PID: 1 at drivers/i2c/i2c-core.c:1930 i2c_register_driver+0xaf/0x100() [ 1.167712] Modules linked in: [ 1.169387] CPU: 0 PID: 1 Comm: swapper Not tainted 4.5.0-rc3-00029-gf3eab42 #425 [ 1.172703] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 1.176318] d0e60000 00000000 d0e69e6c c15d695c d0e69ea0 c1078634 c20ef328 00000000 [ 1.180655] 00000001 c21d2ca0 0000078a c1b5af9f c1b5af9f c21d2ca0 c2700460 00000000 [ 1.184966] c2247920 d0e69eb0 c1078720 00000009 00000000 d0e69ed4 c1b5af9f d0c05120 [ 1.189307] Call Trace: [ 1.190748] [<c15d695c>] dump_stack+0x16/0x1a [ 1.192612] [<c1078634>] warn_slowpath_common+0x94/0xe0 [ 1.194670] [<c1b5af9f>] ? i2c_register_driver+0xaf/0x100 [ 1.196777] [<c1b5af9f>] ? i2c_register_driver+0xaf/0x100 [ 1.198876] [<c1078720>] warn_slowpath_null+0x20/0x30 [ 1.200887] [<c1b5af9f>] i2c_register_driver+0xaf/0x100 [ 1.202950] [<c17e1cfc>] ? class_compat_register+0x3c/0x60 [ 1.205067] [<c289fd9c>] i2c_init+0x5b/0x8d [ 1.206928] [<c289fd41>] ? trace_event_define_fields_smbus_write+0xa/0xa [ 1.209306] [<c10004a0>] do_one_initcall+0xd0/0x2e0 [ 1.211284] [<c289fd41>] ? trace_event_define_fields_smbus_write+0xa/0xa [ 1.213670] [<c10a2ce3>] ? parse_args+0x233/0x640 [ 1.215613] [<c289fd41>] ? trace_event_define_fields_smbus_write+0xa/0xa [ 1.218022] [<c10af62d>] ? preempt_count_sub+0xbd/0x140 [ 1.220077] [<c10bf774>] ? __wake_up+0x44/0x50 [ 1.221962] [<c2843faf>] ? kernel_init_freeable+0x1fc/0x30d [ 1.224091] [<c2844033>] kernel_init_freeable+0x280/0x30d [ 1.226206] [<c1e05d90>] kernel_init+0x10/0xe0 [ 1.228107] [<c1e0e9c8>] ret_from_kernel_thread+0x20/0x34 [ 1.230214] [<c1e05d80>] ? rest_init+0xb0/0xb0 [ 1.232107] ---[ end trace e92e6e4d14dc1d8f ]--- [ 1.245810] cpuidle: using governor menu git bisect start f3eab4251515a492aa38e515d9a2322c535ce358 3bf58bb5da86d0a9e20f108a2f5163c4ce1a60dc -- # first bad commit: [f3eab4251515a492aa38e515d9a2322c535ce358] i2c: i2c-core: do not use bus internal data git bisect good 3bf58bb5da86d0a9e20f108a2f5163c4ce1a60dc # 20:32 62+ 2 i2c: imx: remove extra spaces. # extra tests with DEBUG_INFO git bisect bad f3eab4251515a492aa38e515d9a2322c535ce358 # 20:34 0- 61 i2c: i2c-core: do not use bus internal data # extra tests on HEAD of linux-review/Sudip-Mukherjee/i2c-i2c-core-do-not-use-bus-internal-data/20160307-195104 git bisect bad f3eab4251515a492aa38e515d9a2322c535ce358 # 20:34 0- 13 i2c: i2c-core: do not use bus internal data # extra tests on tree/branch linux-review/Sudip-Mukherjee/i2c-i2c-core-do-not-use-bus-internal-data/20160307-195104 git bisect bad f3eab4251515a492aa38e515d9a2322c535ce358 # 20:34 0- 13 i2c: i2c-core: do not use bus internal data # extra tests with first bad commit reverted git bisect good 1a18b66147dfc4ef72c38b238a8ea1c2d9ee29e0 # 20:43 62+ 3 Revert "i2c: i2c-core: do not use bus internal data" # extra tests on tree/branch linus/master git bisect good f6cede5b49e822ebc41a099fe41ab4989f64e2cb # 20:46 62+ 0 Linux 4.5-rc7 # extra tests on tree/branch linux-next/master git bisect good 078dd3bb709cb9848707609916f424a5de7f8e63 # 20:48 62+ 1 Add linux-next specific files for 20160307 This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 initrd=quantal-core-i386.cgz wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd kvm=( qemu-system-x86_64 -enable-kvm -cpu kvm64 -kernel $kernel -initrd $initrd -m 300 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation