Re: WARNING: suspicious RCU usage: race/events/tlb.h:57 suspicious rcu_dereference_check() usage!
On Mon, Sep 14, 2020 at 01:29:34PM -0400, Qian Cai wrote: > On Wed, 2020-09-09 at 10:08 +0530, Naresh Kamboju wrote: > > While booting x86_64 with Linux next 20200908 tag kernel this warning > > was noticed. > > This pretty much looks like the same issue in: > > https://lore.kernel.org/lkml/20200902035146.ga45...@roeck-us.net/ > > Can you revert the patchset to see if it is related? Don't bother.. I'll be sending patches soon.
Re: WARNING: suspicious RCU usage: race/events/tlb.h:57 suspicious rcu_dereference_check() usage!
On Wed, 2020-09-09 at 10:08 +0530, Naresh Kamboju wrote:
> While booting x86_64 with Linux next 20200908 tag kernel this warning
> was noticed.
This pretty much looks like the same issue in:
https://lore.kernel.org/lkml/20200902035146.ga45...@roeck-us.net/
Can you revert the patchset to see if it is related?
>
> metadata:
> git branch: master
> git repo:
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
> git describe: next-20200908
> kernel-config:
> http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
>
> warning logs:
> -
> [ 18.874329] Freeing unused kernel image (rodata/data gap) memory: 2012K
> [ 18.881107] Run /sbin/init as init process
> [ 18.905611]
> [ 18.907190] =
> [ 18.911194] WARNING: suspicious RCU usage
> [ 18.915199] 5.9.0-rc4-next-20200908 #1 Not tainted
> [ 18.919982] -
> [ 18.923984] /usr/src/kernel/include/trace/events/tlb.h:57
> suspicious rcu_dereference_check() usage!
> [ 18.933016]
> [ 18.933016] other info that might help us debug this:
> [ 18.933016]
> [ 18.941006]
> [ 18.941006] rcu_scheduler_active = 2, debug_locks = 1
> [ 18.947523] RCU used illegally from extended quiescent state!
> [ 18.953261] no locks held by swapper/2/0.
> [ 18.957264]
> [ 18.957264] stack backtrace:
> [ 18.961619] CPU: 2 PID: 0 Comm: swapper/2 Not tainted
> 5.9.0-rc4-next-20200908 #1
> [ 18.969007] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [ 18.976392] Call Trace:
> [ 18.978844] dump_stack+0x7d/0x9f
> [ 18.982158] lockdep_rcu_suspicious+0xce/0xf0
> [ 18.986517] switch_mm_irqs_off+0x441/0x450
> [ 18.990702] switch_mm+0x1b/0x50
> [ 18.993936] leave_mm+0x34/0x40
> [ 18.997082] acpi_idle_enter_bm+0x23/0x120
> [ 19.001180] acpi_idle_enter+0x189/0x2a0
> [ 19.005104] ? rcu_eqs_enter.constprop.85+0xb2/0x180
> [ 19.010072] cpuidle_enter_state+0xa5/0x4b0
> [ 19.015265] cpuidle_enter+0x2e/0x40
> [ 19.015268] do_idle+0x226/0x2b0
> [ 19.015273] cpu_startup_entry+0x1d/0x20
> [ 19.015275] start_secondary+0x114/0x150
> [ 19.029943] secondary_startup_64+0xb6/0xc0
> [ 19.034141]
> [ 19.034142] =
> [ 19.034142] WARNING: suspicious RCU usage
> [ 19.034142] 5.9.0-rc4-next-20200908 #1 Not tainted
> [ 19.034143] -
> [ 19.034143] /usr/src/kernel/include/trace/events/lock.h:37
> suspicious rcu_dereference_check() usage!
> [ 19.034143]
> [ 19.034144] other info that might help us debug this:
> [ 19.034144]
> [ 19.034144]
> [ 19.034145] rcu_scheduler_active = 2, debug_locks = 1
> [ 19.034145] RCU used illegally from extended quiescent state!
> [ 19.034146] no locks held by swapper/2/0.
> [ 19.034146]
> [ 19.034146] stack backtrace:
> [ 19.034147] CPU: 2 PID: 0 Comm: swapper/2 Not tainted
> 5.9.0-rc4-next-20200908 #1
> [ 19.034147] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [ 19.034147] Call Trace:
> [ 19.034148] dump_stack+0x7d/0x9f
> [ 19.034148] lockdep_rcu_suspicious+0xce/0xf0
> [ 19.034148] lock_acquire+0x327/0x390
> [ 19.034149] _raw_spin_lock+0x2f/0x40
> [ 19.034149] ? vprintk_emit+0x78/0x2f0
> [ 19.034149] vprintk_emit+0x78/0x2f0
> [ 19.034149] vprintk_default+0x1f/0x30
> [ 19.034150] vprintk_func+0x51/0xf0
> [ 19.034150] printk+0x52/0x6e
> [ 19.034150] ? __lock_acquire+0x32a/0x19f0
> [ 19.034151] lockdep_rcu_suspicious+0x20/0xf0
> [ 19.034151] switch_mm_irqs_off+0x441/0x450
> [ 19.034151] switch_mm+0x1b/0x50
> [ 19.034152] leave_mm+0x34/0x40
> [ 19.034152] acpi_idle_enter_bm+0x23/0x120
> [ 19.034152] acpi_idle_enter+0x189/0x2a0
> [ 19.034153] ? rcu_eqs_enter.constprop.85+0xb2/0x180
> [ 19.034153] cpuidle_enter_state+0xa5/0x4b0
> [ 19.034153] cpuidle_enter+0x2e/0x40
> [ 19.034154] do_idle+0x226/0x2b0
> [ 19.034154] cpu_startup_entry+0x1d/0x20
> [ 19.034154] start_secondary+0x114/0x150
> [ 19.034155] secondary_startup_64+0xb6/0xc0
> [ 19.034155]
> [ 19.034155] =
> [ 19.034156] WARNING: suspicious RCU usage
> [ 19.034156] 5.9.0-rc4-next-20200908 #1 Not tainted
> [ 19.034156] -
> [ 19.034157] /usr/src/kernel/include/trace/events/lock.h:63
> suspicious rcu_dereference_check() usage!
> [ 19.034157]
> [ 19.034157] other info that might help us debug this:
> [ 19.034158]
> [ 19.034158]
> [ 19.034158] rcu_scheduler_active = 2, debug_locks = 1
> [ 19.034159] RCU used illegally from extended quiescent state!
> [ 19.034159] 1 lock held by swapper/2/0:
> [ 19.034159] #0: bed25f58 (logbuf_lock){-...}-{2:2}, at:
> vprintk_emit+0x78/0x2f0
> [ 19.034161]
> [ 19.034161] stack backtrace:
> [ 19.034162] CPU: 2 PID: 0 Comm: swapper/2 Not
WARNING: suspicious RCU usage: race/events/tlb.h:57 suspicious rcu_dereference_check() usage!
While booting x86_64 with Linux next 20200908 tag kernel this warning
was noticed.
metadata:
git branch: master
git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
git describe: next-20200908
kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
warning logs:
-
[ 18.874329] Freeing unused kernel image (rodata/data gap) memory: 2012K
[ 18.881107] Run /sbin/init as init process
[ 18.905611]
[ 18.907190] =
[ 18.911194] WARNING: suspicious RCU usage
[ 18.915199] 5.9.0-rc4-next-20200908 #1 Not tainted
[ 18.919982] -
[ 18.923984] /usr/src/kernel/include/trace/events/tlb.h:57
suspicious rcu_dereference_check() usage!
[ 18.933016]
[ 18.933016] other info that might help us debug this:
[ 18.933016]
[ 18.941006]
[ 18.941006] rcu_scheduler_active = 2, debug_locks = 1
[ 18.947523] RCU used illegally from extended quiescent state!
[ 18.953261] no locks held by swapper/2/0.
[ 18.957264]
[ 18.957264] stack backtrace:
[ 18.961619] CPU: 2 PID: 0 Comm: swapper/2 Not tainted
5.9.0-rc4-next-20200908 #1
[ 18.969007] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 18.976392] Call Trace:
[ 18.978844] dump_stack+0x7d/0x9f
[ 18.982158] lockdep_rcu_suspicious+0xce/0xf0
[ 18.986517] switch_mm_irqs_off+0x441/0x450
[ 18.990702] switch_mm+0x1b/0x50
[ 18.993936] leave_mm+0x34/0x40
[ 18.997082] acpi_idle_enter_bm+0x23/0x120
[ 19.001180] acpi_idle_enter+0x189/0x2a0
[ 19.005104] ? rcu_eqs_enter.constprop.85+0xb2/0x180
[ 19.010072] cpuidle_enter_state+0xa5/0x4b0
[ 19.015265] cpuidle_enter+0x2e/0x40
[ 19.015268] do_idle+0x226/0x2b0
[ 19.015273] cpu_startup_entry+0x1d/0x20
[ 19.015275] start_secondary+0x114/0x150
[ 19.029943] secondary_startup_64+0xb6/0xc0
[ 19.034141]
[ 19.034142] =
[ 19.034142] WARNING: suspicious RCU usage
[ 19.034142] 5.9.0-rc4-next-20200908 #1 Not tainted
[ 19.034143] -
[ 19.034143] /usr/src/kernel/include/trace/events/lock.h:37
suspicious rcu_dereference_check() usage!
[ 19.034143]
[ 19.034144] other info that might help us debug this:
[ 19.034144]
[ 19.034144]
[ 19.034145] rcu_scheduler_active = 2, debug_locks = 1
[ 19.034145] RCU used illegally from extended quiescent state!
[ 19.034146] no locks held by swapper/2/0.
[ 19.034146]
[ 19.034146] stack backtrace:
[ 19.034147] CPU: 2 PID: 0 Comm: swapper/2 Not tainted
5.9.0-rc4-next-20200908 #1
[ 19.034147] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 19.034147] Call Trace:
[ 19.034148] dump_stack+0x7d/0x9f
[ 19.034148] lockdep_rcu_suspicious+0xce/0xf0
[ 19.034148] lock_acquire+0x327/0x390
[ 19.034149] _raw_spin_lock+0x2f/0x40
[ 19.034149] ? vprintk_emit+0x78/0x2f0
[ 19.034149] vprintk_emit+0x78/0x2f0
[ 19.034149] vprintk_default+0x1f/0x30
[ 19.034150] vprintk_func+0x51/0xf0
[ 19.034150] printk+0x52/0x6e
[ 19.034150] ? __lock_acquire+0x32a/0x19f0
[ 19.034151] lockdep_rcu_suspicious+0x20/0xf0
[ 19.034151] switch_mm_irqs_off+0x441/0x450
[ 19.034151] switch_mm+0x1b/0x50
[ 19.034152] leave_mm+0x34/0x40
[ 19.034152] acpi_idle_enter_bm+0x23/0x120
[ 19.034152] acpi_idle_enter+0x189/0x2a0
[ 19.034153] ? rcu_eqs_enter.constprop.85+0xb2/0x180
[ 19.034153] cpuidle_enter_state+0xa5/0x4b0
[ 19.034153] cpuidle_enter+0x2e/0x40
[ 19.034154] do_idle+0x226/0x2b0
[ 19.034154] cpu_startup_entry+0x1d/0x20
[ 19.034154] start_secondary+0x114/0x150
[ 19.034155] secondary_startup_64+0xb6/0xc0
[ 19.034155]
[ 19.034155] =
[ 19.034156] WARNING: suspicious RCU usage
[ 19.034156] 5.9.0-rc4-next-20200908 #1 Not tainted
[ 19.034156] -
[ 19.034157] /usr/src/kernel/include/trace/events/lock.h:63
suspicious rcu_dereference_check() usage!
[ 19.034157]
[ 19.034157] other info that might help us debug this:
[ 19.034158]
[ 19.034158]
[ 19.034158] rcu_scheduler_active = 2, debug_locks = 1
[ 19.034159] RCU used illegally from extended quiescent state!
[ 19.034159] 1 lock held by swapper/2/0:
[ 19.034159] #0: bed25f58 (logbuf_lock){-...}-{2:2}, at:
vprintk_emit+0x78/0x2f0
[ 19.034161]
[ 19.034161] stack backtrace:
[ 19.034162] CPU: 2 PID: 0 Comm: swapper/2 Not tainted
5.9.0-rc4-next-20200908 #1
[ 19.034162] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 19.034162] Call Trace:
[ 19.034163] dump_stack+0x7d/0x9f
[ 19.034163] lockdep_rcu_suspicious+0xce/0xf0
[ 19.034163] ? vprintk_emit+0x9e/0x2f0
[ 19.034164] lock_release+0x246/0x270
[ 19.034164] _raw_spin_unlock+0x1a/0x30
[ 19.034164] vprintk_emit+0x9e/0x2f0
[ 19.034165] vprintk_default+0x1f/0x30
[ 19.034165]
