On Sun, Oct 29, 2017 at 11:51:55PM +0100, Fengguang Wu wrote: >Hi Linus, > >Up to now we see the below boot error/warnings when testing v4.14-rc6. > >They hit the RC release mainly due to various imperfections in 0day's >auto bisection. So I manually list them here and CC the likely easy to >debug ones to the corresponding maintainers in the followup emails. > >boot_successes: 4700 >boot_failures: 247 [...] >WARNING:at_kernel/jump_label.c:#static_key_disable_cpuslocked: 7 The call trace is [ 0.000000] Booting paravirtualized kernel on bare hardware [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns [ 0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:72 nr_cpu_ids:72 nr_node_ids:2 [ 0.000000] percpu: Embedded 39 pages/cpu @ffff88103f400000 s120088 r8192 d31464 u262144 [ 0.000000] pcpu-alloc: s120088 r8192 d31464 u262144 alloc=1*2097152 [ 0.000000] pcpu-alloc: [0] 00 01 02 03 04 05 06 07 [0] 08 09 10 11 12 13 14 15 [ 0.000000] pcpu-alloc: [0] 16 17 36 37 38 39 40 41 [0] 42 43 44 45 46 47 48 49 [ 0.000000] pcpu-alloc: [0] 50 51 52 53 -- -- -- -- [1] 18 19 20 21 22 23 24 25 [ 0.000000] pcpu-alloc: [1] 26 27 28 29 30 31 32 33 [1] 34 35 54 55 56 57 58 59 [ 0.000000] pcpu-alloc: [1] 60 61 62 63 64 65 66 67 [1] 68 69 70 71 -- -- -- -- [ 0.000000] static_key_disable_cpuslocked(): static key 'virt_spin_lock_key+0x0/0x20' used before call to jump_label_init() [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:161 static_key_disable_cpuslocked+0x6c/0x80 [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.0-rc6-00162-g3d6dabc2 #1 [ 0.000000] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS SE5C610.86B.01.01.0008.021120151325 02/11/2015 [ 0.000000] task: ffffffff81e10480 task.stack: ffffffff81e00000 [ 0.000000] RIP: 0010:static_key_disable_cpuslocked+0x6c/0x80 [ 0.000000] RSP: 0000:ffffffff81e03e98 EFLAGS: 00010092 ORIG_RAX: 0000000000000000 [ 0.000000] RAX: 000000000000006f RBX: ffffffff81e36fc0 RCX: ffffffff81e60cf8 [ 0.000000] RDX: 0000000000000001 RSI: 0000000000000092 RDI: 0000000000000047 [ 0.000000] RBP: ffffffff81e03ea8 R08: 6b5f636974617473 R09: 000000000000018c [ 0.000000] R10: 0000000000000000 R11: 000000000000006f R12: ffff88207ffcf4c0 [ 0.000000] R13: ffffffff82170920 R14: ffffffff8218b780 R15: 0000000000000000 [ 0.000000] FS: 0000000000000000(0000) GS:ffff88103f400000(0000) knlGS:0000000000000000 [ 0.000000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.000000] CR2: ffff88207f4e0000 CR3: 000000207ee09000 CR4: 00000000000606b0 [ 0.000000] Call Trace: [ 0.000000] static_key_disable+0x1a/0x30 [ 0.000000] native_pv_lock_init+0x1b/0x1e [ 0.000000] native_smp_prepare_boot_cpu+0x32/0x35 [ 0.000000] start_kernel+0x14f/0x421 [ 0.000000] x86_64_start_reservations+0x2a/0x2c [ 0.000000] x86_64_start_kernel+0x72/0x75 [ 0.000000] secondary_startup_64+0xa5/0xb0 [ 0.000000] Code: 85 c0 75 2f 48 c7 c7 20 5e f0 81 e8 df 2a 7b 00 5b 41 5c 5d c3 48 89 fa 48 c7 c6 40 93 a3 81 48 c7 c7 00 8b cb 81 e8 95 b5 f3 ff <0f> ff eb a8 0f ff eb b3 48 89 df e8 14 fc ff ff eb c7 66 90 e8 [ 0.000000] ---[ end trace c12d07f00399ce78 ]--- [ 0.000000] Built 2 zonelists, mobility grouping on. Total pages: 33006159 [ 0.000000] Policy zone: Normal which is bisected to commit 9043442b43b1fddf202591b84702863286700c1a Author: Juergen Gross AuthorDate: Wed Sep 6 19:36:24 2017 +0200 Commit: Ingo Molnar CommitDate: Tue Oct 10 11:50:12 2017 +0200 locking/paravirt: Use new static key for controlling call of virt_spin_lock() There are cases where a guest tries to switch spinlocks to bare metal behavior (e.g. by setting "xen_nopvspin" boot parameter). Today this has the downside of falling back to unfair test and set scheme for qspinlocks due to virt_spin_lock() detecting the virtualized environment. Add a static key controlling whether virt_spin_lock() should be called or not. When running on bare metal set the new key to false. Signed-off-by: Juergen Gross Signed-off-by: Peter Zijlstra (Intel) Acked-by: Waiman Long Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: akataria@vmware.com Cc: boris.ostrovsky@oracle.com Cc: chrisw@sous-sol.org Cc: hpa@zytor.com Cc: jeremy@goop.org Cc: rusty@rustcorp.com.au Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20170906173625.18158-2-jgross@suse.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/qspinlock.h | 11 ++++++++++- arch/x86/kernel/paravirt.c | 14 ++++++++++++-- arch/x86/kernel/smpboot.c | 2 ++ 3 files changed, 24 insertions(+), 3 deletions(-) Thanks, Fengguang