Hi Marc, 0day kernel testing robot got the below dmesg and the first bad commit is git://gitorious.org/linux-can/linux-can-next testing-c_can commit 0a240764becbec91589bd579b591c2fcf2df2bcf Merge: 163cd4e 367525c Author: Marc Kleine-Budde AuthorDate: Mon May 12 17:38:04 2014 +0200 Commit: Marc Kleine-Budde CommitDate: Mon May 12 17:38:04 2014 +0200 Merge tag 'linux-can-fixes-for-3.15-20140424' into HEAD linux-can-fixes-for-3.15-20140424 Conflicts: net/netlink/af_netlink.c net/sched/cls_api.c net/sched/sch_api.c +------------------------------------------------------+------------+------------+ | | 163cd4e817 | 0a240764be | +------------------------------------------------------+------------+------------+ | boot_successes | 78 | 0 | | boot_failures | 2 | 20 | | BUG:kernel_test_crashed | 2 | | | BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 20 | | Oops | 0 | 20 | | RIP:sk_ns_capable | 0 | 20 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 20 | | backtrace:SYSC_bind | 0 | 20 | | backtrace:SyS_bind | 0 | 20 | +------------------------------------------------------+------------+------------+ [ 1.277078] PM: Hibernation image not present or could not be loaded. [ 1.279648] Freeing unused kernel memory: 1720K (ffffffff81c40000 - ffffffff81dee000) [ 1.284871] random: init urandom read with 6 bits of entropy available [ 1.297495] BUG: unable to handle kernel NULL pointer dereference at 000000000000022f [ 1.298038] IP: [] sk_ns_capable+0xf/0x40 [ 1.298038] PGD 0 [ 1.298038] Oops: 0000 [#1] SMP [ 1.301030] Modules linked in: [ 1.301030] CPU: 0 PID: 84 Comm: mountall Not tainted 3.15.0-rc1-00466-g0a24076 #1 [ 1.301982] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 1.301982] task: ffff88000bd58000 ti: ffff88000bece000 task.ti: ffff88000bece000 [ 1.301982] RIP: 0010:[] [] sk_ns_capable+0xf/0x40 [ 1.301982] RSP: 0018:ffff88000becfe58 EFLAGS: 00010202 [ 1.301982] RAX: 0000000000000002 RBX: ffff88000d132c80 RCX: 0000000000000000 [ 1.301982] RDX: 0000000000000001 RSI: ffffffff81b093c0 RDI: ffffffffffffffff [ 1.301982] RBP: ffff88000becfe68 R08: ffff88000becfd98 R09: ffff88000bdfb800 [ 1.301982] R10: ffff88000c7093c0 R11: ffff88000bd58000 R12: 0000000000000001 [ 1.301982] R13: ffffffff81bd6b40 R14: ffff88000becfec8 R15: ffff88000d132c80 [ 1.301982] FS: 00007fe255390700(0000) GS:ffff880012600000(0000) knlGS:0000000000000000 [ 1.301982] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.301982] CR2: 000000000000022f CR3: 000000000be39000 CR4: 00000000000006f0 [ 1.301982] Stack: [ 1.301982] ffff88000d132c80 ffff88000bdfb800 ffff88000becfeb0 ffffffff8163ee35 [ 1.301982] ffff88000d132c80 0000000000000002 ffff88000d132c80 000000000000000c [ 1.301982] ffff88000becfec8 00007fe25723e4b0 0000000000000000 ffff88000becff68 [ 1.301982] Call Trace: [ 1.301982] [] netlink_bind+0x1e5/0x220 [ 1.301982] [] SYSC_bind+0xb8/0xf0 [ 1.301982] [] ? sock_setsockopt+0x1a8/0x9c0 [ 1.301982] [] ? SyS_setsockopt+0xb6/0xd0 [ 1.301982] [] SyS_bind+0xe/0x10 [ 1.301982] [] system_call_fastpath+0x16/0x1b [ 1.301982] Code: 50 48 85 c0 74 06 ff d0 5d c3 66 90 41 ff 51 40 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 41 89 d4 53 <48> 8b 87 30 02 00 00 48 89 f3 48 8b 78 18 e8 ae 94 a7 ff 31 d2 [ 1.301982] RIP [] sk_ns_capable+0xf/0x40 [ 1.301982] RSP [ 1.301982] CR2: 000000000000022f [ 1.337456] ---[ end trace e34617f32717aa50 ]--- [ 1.338240] Kernel panic - not syncing: Fatal exception Attached dmesg for the parent commit, too, to help confirm whether it is a noise error. git bisect start 99cbc75a89e5ab441461c44886a78eeb58335f09 163cd4e817a4444e348ca577cb74c71d245f0c72 -- git bisect bad 0a240764becbec91589bd579b591c2fcf2df2bcf # 00:24 0- 20 Merge tag 'linux-can-fixes-for-3.15-20140424' into HEAD git bisect good 1da394d889b4110bda954813ef32601c06118376 # 00:34 20+ 0 can: c_can: Always update error stats git bisect good 7af28630b87d0b2eefeee8547ad52df7e0e1b1c4 # 00:44 20+ 0 can: c_can: Cleanup c_can_msg_obj_put/get() git bisect good f323d7a1d2868c00b2604dca36ad82e8ecbe4270 # 00:55 20+ 0 can: c_can: use proper type for 'instance' git bisect good a9edcdedbd3d8f3ffcd7bdcab5812707a25e554e # 01:04 20+ 0 can: sja1000_isa: add locking for indirect register access mode git bisect good 367525c8c20a34560afe1d0c7cca52a44ccd62e9 # 01:06 20+ 0 can: slcan: Fix spinlock variant # first bad commit: [0a240764becbec91589bd579b591c2fcf2df2bcf] Merge tag 'linux-can-fixes-for-3.15-20140424' into HEAD git bisect good 163cd4e817a4444e348ca577cb74c71d245f0c72 # 01:08 60+ 2 ipv6: remove parameter rt from fib6_prune_clones() git bisect good 367525c8c20a34560afe1d0c7cca52a44ccd62e9 # 01:11 60+ 0 can: slcan: Fix spinlock variant git bisect bad 99cbc75a89e5ab441461c44886a78eeb58335f09 # 01:11 0- 13 C_CAN: Add 32-bit accesses git bisect good 7e338c9991ecee9c2ac7a4cee2c2e11ecb563d02 # 01:13 60+ 8 Merge branch 'for-3.15' of git://linux-nfs.org/~bfields/linux git bisect good 93d9fcc0ec9f9447a94e440cf9d96a6edaa3a219 # 01:14 60+ 0 Add linux-next specific files for 20140512 This script may reproduce the error. ----------------------------------------------------------------------------- #!/bin/bash kernel=$1 initrd=quantal-core-x86_64.cgz wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$initrd kvm=( qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel $kernel -initrd $initrd -smp 2 -m 256M -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio -net user,vlan=0 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -serial stdio -display none -monitor null ) append=( debug sched_debug apic=debug ignore_loglevel sysrq_always_enabled panic=10 prompt_ramdisk=0 earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw ) "${kvm[@]}" --append "${append[*]}" ----------------------------------------------------------------------------- Thanks, Jet