FYI, we noticed the below changes on
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core
commit 7f47d8cc039f8746e0038fe05f1ddcb15a2e27f0 ("x86, tracing, perf: Add trace point for MSR accesses")
+--------------------------------------------------+------------+------------+
| | bd2a634d9e | 7f47d8cc03 |
+--------------------------------------------------+------------+------------+
| boot_successes | 10 | 2 |
| boot_failures | 0 | 8 |
| BUG:kernel_early-boot_hang | 0 | 2 |
| INFO:suspicious_RCU_usage | 0 | 6 |
| RCU_used_illegally_from_idle_CPU | 0 | 6 |
| RCU_used_illegally_from_extended_quiescent_state | 0 | 6 |
| invoked_oom-killer:gfp_mask=0x | 0 | 5 |
| Mem-Info | 0 | 5 |
| Out_of_memory:Kill_process | 0 | 5 |
| backtrace:cpu_startup_entry | 0 | 4 |
| backtrace:vfs_writev | 0 | 3 |
| backtrace:SyS_writev | 0 | 3 |
| backtrace:_do_fork | 0 | 1 |
| backtrace:SyS_clone | 0 | 1 |
| backtrace:vfs_write | 0 | 1 |
| backtrace:SyS_write | 0 | 1 |
+--------------------------------------------------+------------+------------+
[main] Added 32 filenames from /dev
[ 45.280682]
[ 45.281065] ===============================
[ 45.281884] [ INFO: suspicious RCU usage. ]
[ 45.282527] 4.4.0-rc2-00097-g7f47d8c #23 Not tainted
[ 45.283253] -------------------------------
[ 45.284035] arch/x86/include/asm/msr-trace.h:47 suspicious rcu_dereference_check() usage!
[ 45.285533]
[ 45.285533] other info that might help us debug this:
[ 45.285533]
[ 45.286929]
[ 45.286929] RCU used illegally from idle CPU!
[ 45.286929] rcu_scheduler_active = 1, debug_locks = 0
[ 45.289836] RCU used illegally from extended quiescent state!
[ 45.291309] no locks held by swapper/0/0.
[ 45.292430]
[ 45.292430] stack backtrace:
[ 45.293441] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-rc2-00097-g7f47d8c #23
[ 45.294571] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 45.295898] 0000000000000000 ffff88009f403ed8 ffffffff8173cf5f ffffffff84019500
[ 45.298424] ffff88009f403f08 ffffffff81113775 0000000000000000 0000000000000000
[ 45.300879] ffffffff84004000 ffffffff84000000 ffff88009f403f38 ffffffff81772b19
[ 45.303367] Call Trace:
[ 45.304171] <IRQ> [<ffffffff8173cf5f>] dump_stack+0x4b/0x63
[ 45.305793] [<ffffffff81113775>] lockdep_rcu_suspicious+0xf7/0x100
[ 45.307352] [<ffffffff81772b19>] do_trace_write_msr+0x9b/0xf4
[ 45.308856] [<ffffffff81092624>] native_write_msr_safe+0x2e/0x33
[ 45.310293] [<ffffffff8108b8eb>] paravirt_write_msr+0xf/0x13
[ 45.311116] [<ffffffff8108ba04>] native_apic_msr_write+0x29/0x2b
[ 45.311997] [<ffffffff81091999>] kvm_guest_apic_eoi_write+0x36/0x38
[ 45.312878] [<ffffffff8108685b>] apic_eoi+0x18/0x1a
[ 45.313856] [<ffffffff82e16fc1>] smp_apic_timer_interrupt+0x1f/0x3e
[ 45.314766] [<ffffffff82e15207>] apic_timer_interrupt+0x87/0x90
[ 45.315605] <EOI> [<ffffffff81092338>] ? native_safe_halt+0x6/0x8
[ 45.316571] [<ffffffff8105f2f1>] default_idle+0x24/0x37
[ 45.317750] [<ffffffff8105f93e>] arch_cpu_idle+0xf/0x11
[ 45.318794] [<ffffffff8110cbe2>] default_idle_call+0x28/0x2f
[ 45.319610] [<ffffffff8110cdbd>] cpu_startup_entry+0x17a/0x29a
[ 45.321018] [<ffffffff82e08603>] rest_init+0x13a/0x140
[ 45.322382] [<ffffffff84607f65>] start_kernel+0x45e/0x46b
[ 45.323443] [<ffffffff84607120>] ? early_idt_handler_array+0x120/0x120
[ 45.324386] [<ffffffff84607339>] x86_64_start_reservations+0x2a/0x2c
[ 45.325363] [<ffffffff84607468>] x86_64_start_kernel+0x12d/0x13a
[main] Added 107172 filenames from /proc
[main] Added 25531 filenames from /sys
[main] Enabled 9 fd providers.
To reproduce:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
Ying Huang