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Date: Mon, 7 Dec 2020 05:52:36 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: open list <linux-kernel@...r.kernel.org>, rcu@...r.kernel.org,
linux-mm <linux-mm@...ck.org>,
linux-stable <stable@...r.kernel.org>,
linux-fsdevel@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sasha Levin <sashal@...nel.org>, Chao Yu <yuchao0@...wei.com>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Mike Galbraith <efault@....de>,
Thomas Gleixner <tglx@...utronix.de>,
"Paul E. McKenney" <paulmck@...nel.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: sched: core.c:7270 Illegal context switch in RCU-bh read-side
critical section! __alloc_pages_nodemask
On Mon, Dec 07, 2020 at 11:06:10AM +0530, Naresh Kamboju wrote:
> While booting arm64 hikey board with stable-rc 5.9.13-rc1 the following warning
> noticed. This is hard to reproduce.
Ugh. You've got two warnings interleaved here. This is impossible
to read. Do you have any examples where only one of them happens?
> Step to reproduce:
> ------------------------
> # Boot arm64 hikey device with stable-rc 5.9.13-rc1
> # Since it is hard to reproduce you may notice this warning
>
> Crash log :
> --------------
> [ 10.763081] [drm] Initialized kirin 1.0.0 20150718 for f4100000.ade
> on minor 1
> [ 10.764088] Bluetooth: hci0: change remote baud rate command in firmware
> [[0;32m OK [0m] Started TEE Supplicant.
> [ 10.791741] mmc_host mmc2: Bus speed (slot 0) = 24800000Hz (slot
> req 400000Hz, actual 400000HZ div = 31)
> E/TC:0 tee_entry_std:545 Bad arg address 0x6b681000
> [[0;32m OK [0m] Started Periodic Command Scheduler.
> [ 10.846417] mmc_host mmc2: Bus speed (slot 0) = 24800000Hz (slot
> req 25000000Hz, actual 24800000HZ div = 0)
> [ 10.887083]
> [ 10.887087]
> [ 10.887095] =====================================
> [ 10.887098] =============================
> [ 10.887101] WARNING: bad unlock balance detected!
> [ 10.887107] WARNING: suspicious RCU usage
> [ 10.887112] 5.9.13-rc1 #1 Not tainted
> [ 10.887120] 5.9.13-rc1 #1 Not tainted
> [ 10.887122] -------------------------------------
> [ 10.887129] systemd-udevd/306 is trying to release lock (
> [ 10.887133] -----------------------------
> [ 10.887135] fs_reclaim) at:
> [ 10.887144] /usr/src/kernel/kernel/sched/core.c:7270 Illegal
> context switch in RCU-bh read-side critical section!
> [ 10.887163] [<ffff80001030f2e8>] __alloc_pages_nodemask+0x250/0x4c0
> [ 10.887166]
> [ 10.887166] other info that might help us debug this:
> [ 10.887166]
> [ 10.887170] but there are no more locks to release!
> [ 10.887175]
> [ 10.887175] other info that might help us debug this:
> [ 10.887179]
> [ 10.887179] rcu_scheduler_active = 2, debug_locks = 0
> [ 10.887182] 1 lock held by systemd-udevd/306:
> [ 10.887189] 1 lock held by systemd-sysctl/342:
> [ 10.887192] #0: ffff00007474e518
> [ 10.887199] #0:
> [ 10.887202] (
> [ 10.887209] ffff000070c54708
> [ 10.887212] &mm->mmap_lock){++++}-{3:3}
> [ 10.887219] (
> [ 10.887228] , at: do_page_fault+0x168/0x420
> [ 10.887230] &type->i_mutex_dir_key
> [ 10.887235]
> [ 10.887235] stack backtrace:
> [ 10.887237] #3){++++}-{3:3}
> [ 10.887246] CPU: 1 PID: 306 Comm: systemd-udevd Not tainted 5.9.13-rc1 #1
> [ 10.887255] , at: iterate_dir+0x54/0x1d0
> [ 10.887258] Hardware name: HiKey Development Board (DT)
> [ 10.887264]
> [ 10.887264] stack backtrace:
> [ 10.887266] Call trace:
> [ 10.887276] dump_backtrace+0x0/0x1f8
> [ 10.887283] show_stack+0x2c/0x38
> [ 10.887292] dump_stack+0xec/0x158
> [ 10.887303] print_unlock_imbalance_bug+0xec/0xf0
> [ 10.887311] lock_release+0x300/0x388
> [ 10.887320] __alloc_pages_nodemask+0x268/0x4c0
> [ 10.887329] alloc_pages_vma+0x90/0x240
> [ 10.887338] handle_mm_fault+0x8d4/0x12f0
> [ 10.887346] do_page_fault+0x1c4/0x420
> [ 10.887353] do_translation_fault+0xb0/0xcc
> [ 10.887363] do_mem_abort+0x50/0xb0
> [ 10.887372] el1_abort+0x28/0x30
> [ 10.887379] el1_sync_handler+0xc0/0xf0
> [ 10.887386] el1_sync+0x7c/0x100
> [ 10.887397] __arch_copy_to_user+0x1d8/0x310
> [ 10.887407] copy_page_to_iter+0x110/0x3e8
> [ 10.887416] generic_file_buffered_read+0x4b8/0xaa8
> [ 10.887423] generic_file_read_iter+0xd4/0x168
> [ 10.887432] blkdev_read_iter+0x50/0x78
> [ 10.887442] new_sync_read+0x100/0x1a0
> [ 10.887449] vfs_read+0x1b4/0x1d8
> [ 10.887457] ksys_read+0x74/0xf8
> [ 10.887465] __arm64_sys_read+0x24/0x30
> [ 10.887472] el0_svc_common.constprop.3+0x7c/0x198
> [ 10.887478] do_el0_svc+0x34/0xa0
> [ 10.887486] el0_sync_handler+0x16c/0x210
> [ 10.887492] el0_sync+0x140/0x180
> [ 10.887504] CPU: 6 PID: 342 Comm: systemd-sysctl Not tainted 5.9.13-rc1 #1
> [ 10.887510] Hardware name: HiKey Development Board (DT)
> [ 10.887515] Call trace:
> [ 10.887524] dump_backtrace+0x0/0x1f8
> [ 10.887531] show_stack+0x2c/0x38
> [ 10.887542] dump_stack+0xec/0x158
> [ 10.887552] lockdep_rcu_suspicious+0xd4/0xf8
> [ 10.887561] ___might_sleep+0x1e4/0x208
> [ 10.887569] __might_sleep+0x54/0x90
> [ 10.887577] __might_fault+0x58/0xa8
> [ 10.887584] filldir64+0x1f0/0x488
> [ 10.887593] call_filldir+0xb0/0x140
> [ 10.887600] ext4_readdir+0x700/0x900
> [ 10.887607] iterate_dir+0x88/0x1d0
> [ 10.887615] __arm64_sys_getdents64+0x70/0x1a0
> [ 10.887622] el0_svc_common.constprop.3+0x7c/0x198
> [ 10.887629] do_el0_svc+0x34/0xa0
> [ 10.887637] el0_sync_handler+0x16c/0x210
> [ 10.887644] el0_sync+0x140/0x180
> [ 10.912334] Console: switching to colour frame buffer device 256x72
>
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>
> Full boot log link,
> https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-5.9.y/build/v5.9.12-47-g1372e1af58d4/testrun/3538040/suite/linux-log-parser/test/check-kernel-warning-2012813/log
>
> metadata:
> git branch: linux-5.9.y
> git repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
> git commit: 1372e1af58d410676db7917cc3484ca22d471623
> git describe: v5.9.12-47-g1372e1af58d4
> make_kernelversion: 5.9.13-rc1
> kernel-config:
> http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/hikey/lkft/linux-stable-rc-5.9/47/config
>
>
> --
> Linaro LKFT
> https://lkft.linaro.org
>
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