[LKP] WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:790 rcu_nmi_enter()

Hi Andy, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/paranoid commit 995b9074245bb97a669cb0f1e0942b4f086f8e31 Author: Andy Lutomirski <luto(a)amacapital.net&gt; AuthorDate: Fri Nov 21 17:35:26 2014 -0800 Commit: Andy Lutomirski <luto(a)amacapital.net&gt; CommitDate: Mon Nov 24 11:56:06 2014 -0800 [TEST ONLY] Force RCU NMI nesting +--------------------------------------------------------+------------+------------+------------+ | | b7b2ac6ea2 | 995b907424 | d962a8c53c | +--------------------------------------------------------+------------+------------+------------+ | boot_successes | 360 | 81 | 12 | | boot_failures | 0 | 39 | 4 | | WARNING:at_kernel/rcu/tree.c:#rcu_nmi_enter() | 0 | 39 | 4 | | WARNING:at_kernel/rcu/tree.c:#rcu_nmi_exit() | 0 | 39 | 4 | | WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit_common() | 0 | 39 | 4 | | WARNING:at_kernel/rcu/tree.c:#rcu_eqs_enter_common() | 0 | 39 | 4 | | WARNING:at_kernel/sched/sched.h:#select_task_rq_fair() | 0 | 39 | 4 | | backtrace:do_fork | 0 | 39 | 4 | | backtrace:kthreadd | 0 | 39 | 4 | | backtrace:__call_usermodehelper | 0 | 19 | 2 | | backtrace:do_execve_common | 0 | 39 | 4 | | backtrace:SyS_execve | 0 | 39 | 4 | | backtrace:SyS_clone | 0 | 39 | 4 | | backtrace:wait_for_helper | 0 | 30 | 3 | | backtrace:do_execve | 0 | 15 | 2 | | backtrace:run_init_process | 0 | 15 | 2 | | WARNING:CPU:#PID:#at_kernel/sched/sched.h:#select_task | 0 | 0 | 1 | +--------------------------------------------------------+------------+------------+------------+ [ 0.164000] ------------[ cut here ]------------ [ 0.164000] ------------[ cut here ]------------ [ 0.164000] WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:790 rcu_nmi_enter+0xd6/0xf0() [ 0.164000] WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:790 rcu_nmi_enter+0xd6/0xf0() [ 0.164000] Modules linked in: [ 0.164000] Modules linked in: [ 0.164000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.18.0-rc6-00006-g995b907 #169 [ 0.164000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.18.0-rc6-00006-g995b907 #169 [ 0.164000] c21933b8 [ 0.164000] c21933b8 cfc7fe4c cfc7fe4c c1db13a9 c1db13a9 00000000 00000000 cfc7fe80 cfc7fe80 c1086c7c c1086c7c c218eb9c c218eb9c 00000001 00000001 [ 0.164000] 00000000 [ 0.164000] 00000000 c21933b8 c21933b8 00000316 00000316 c111dfb6 c111dfb6 00000316 00000316 c111dfb6 c111dfb6 cfc7febc cfc7febc 00000000 00000000 [ 0.164000] cfc7d490 [ 0.164000] cfc7d490 cfc7fe90 cfc7fe90 c1086cf9 c1086cf9 00000009 00000009 00000000 00000000 cfc7fe98 cfc7fe98 c111dfb6 c111dfb6 cfc7feb4 cfc7feb4 [ 0.164000] Call Trace: [ 0.164000] Call Trace: [ 0.164000] [<c1db13a9>] dump_stack+0xb8/0x108 [ 0.164000] [<c1db13a9>] dump_stack+0xb8/0x108 [ 0.164000] [<c1086c7c>] warn_slowpath_common+0xcc/0x110 [ 0.164000] [<c1086c7c>] warn_slowpath_common+0xcc/0x110 [ 0.164000] [<c111dfb6>] ? rcu_nmi_enter+0xd6/0xf0 [ 0.164000] [<c111dfb6>] ? rcu_nmi_enter+0xd6/0xf0 [ 0.164000] [<c111dfb6>] ? rcu_nmi_enter+0xd6/0xf0 [ 0.164000] [<c111dfb6>] ? rcu_nmi_enter+0xd6/0xf0 [ 0.164000] [<c1086cf9>] warn_slowpath_null+0x39/0x50 [ 0.164000] [<c1086cf9>] warn_slowpath_null+0x39/0x50 [ 0.164000] [<c111dfb6>] rcu_nmi_enter+0xd6/0xf0 [ 0.164000] [<c111dfb6>] rcu_nmi_enter+0xd6/0xf0 [ 0.164000] [<c10051b3>] do_int3+0xf3/0x290 [ 0.164000] [<c10051b3>] do_int3+0xf3/0x290 [ 0.164000] [<c1402cfb>] ? trace_hardirqs_off_thunk+0xc/0x11 [ 0.164000] [<c1402cfb>] ? trace_hardirqs_off_thunk+0xc/0x11 [ 0.164000] [<c1dc75cd>] int3+0x31/0x38 [ 0.164000] [<c1dc75cd>] int3+0x31/0x38 [ 0.164000] [<c106cb13>] ? native_safe_halt+0x13/0x30 [ 0.164000] [<c106cb13>] ? native_safe_halt+0x13/0x30 [ 0.164000] [<c100bf6b>] ? default_do_nmi+0x4b/0x4b [ 0.164000] [<c100bf6b>] ? default_do_nmi+0x4b/0x4b [ 0.164000] [<c10fd30a>] ? trace_hardirqs_on_caller+0x27a/0x3f0 [ 0.164000] [<c10fd30a>] ? trace_hardirqs_on_caller+0x27a/0x3f0 [ 0.164000] [<c100c416>] do_nmi+0x166/0x220 [ 0.164000] [<c100c416>] do_nmi+0x166/0x220 [ 0.164000] [<c1dc754a>] nmi_stack_correct+0x28/0x2d [ 0.164000] [<c1dc754a>] nmi_stack_correct+0x28/0x2d [ 0.164000] [<c106cb13>] ? native_safe_halt+0x13/0x30 [ 0.164000] [<c106cb13>] ? native_safe_halt+0x13/0x30 [ 0.164000] [<c1016029>] default_idle+0x29/0x40 [ 0.164000] [<c1016029>] default_idle+0x29/0x40 [ 0.164000] [<c1017377>] arch_cpu_idle+0x17/0x30 [ 0.164000] [<c1017377>] arch_cpu_idle+0x17/0x30 [ 0.164000] [<c10ef722>] cpu_startup_entry+0x722/0x870 [ 0.164000] [<c10ef722>] cpu_startup_entry+0x722/0x870 [ 0.164000] [<c10590b9>] ? setup_APIC_timer+0x109/0x120 [ 0.164000] [<c10590b9>] ? setup_APIC_timer+0x109/0x120 [ 0.164000] [<c10567be>] start_secondary+0x38e/0x440 [ 0.164000] [<c10567be>] start_secondary+0x38e/0x440 [ 0.164000] ---[ end trace 2458105dd873601c ]--- [ 0.164000] ---[ end trace 2458105dd873601c ]--- git bisect start d962a8c53cb93a1841e5e54a60ce7f52f5ebd5cf 5d01410fe4d92081f349b013a2e7a95429e4f2c9 -- git bisect good 95336268c2f9a2418f5f0e46f4b7970af6d2bd34 # 09:42 80+ 0 Merge 'wireless-testing/master' into devel-cairo-smoke-201411250813 git bisect bad fcea503aa41277952d2fc2e8b6b056220dddd32c # 10:08 10- 1 Merge 'luto/x86/paranoid' into devel-cairo-smoke-201411250813 git bisect good 449d9d1087c0783f04b8f18554f2c43e03b844a8 # 10:52 120+ 0 x86: Clean up current_stack_pointer git bisect good b7b2ac6ea2b5951189cf2fdb801a82a36cb3faeb # 11:15 120+ 0 x86, mce: Improve timeout error messages git bisect bad 995b9074245bb97a669cb0f1e0942b4f086f8e31 # 12:44 30- 16 [TEST ONLY] Force RCU NMI nesting # first bad commit: [995b9074245bb97a669cb0f1e0942b4f086f8e31] [TEST ONLY] Force RCU NMI nesting git bisect good b7b2ac6ea2b5951189cf2fdb801a82a36cb3faeb # 12:53 360+ 0 x86, mce: Improve timeout error messages # extra tests on HEAD of linux-devel/devel-cairo-smoke-201411250813 git bisect bad d962a8c53cb93a1841e5e54a60ce7f52f5ebd5cf # 12:53 0- 4 0day head guard for 'devel-cairo-smoke-201411250813' # extra tests on tree/branch luto/x86/paranoid git bisect good 0a584d301550531d87debefeef554c7b74f401f3 # 14:15 360+ 0 x86, mce: Improve timeout error messages # extra tests on tree/branch linus/master git bisect good 5d01410fe4d92081f349b013a2e7a95429e4f2c9 # 15:07 360+ 0 Linux 3.18-rc6 # extra tests on tree/branch next/master 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 Haswell,+smep,+smap -kernel $kernel -initrd $initrd -m 320 -smp 2 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- Thanks, Fengguang _______________________________________________ LKP mailing list LKP(a)linux.intel.com