From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Shakeel Butt <shakeelb@google.com>,
Joel Fernandes <joel@joelfernandes.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.7 31/60] mm/mmap.c: Add cond_resched() for exit_mmap() CPU stalls
Date: Mon, 10 Aug 2020 15:09:59 -0400 [thread overview]
Message-ID: <20200810191028.3793884-31-sashal@kernel.org> (raw)
In-Reply-To: <20200810191028.3793884-1-sashal@kernel.org>
From: "Paul E. McKenney" <paulmck@kernel.org>
[ Upstream commit 0a3b3c253a1eb2c7fe7f34086d46660c909abeb3 ]
A large process running on a heavily loaded system can encounter the
following RCU CPU stall warning:
rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 3-....: (20998 ticks this GP) idle=4ea/1/0x4000000000000002 softirq=556558/556558 fqs=5190
(t=21013 jiffies g=1005461 q=132576)
NMI backtrace for cpu 3
CPU: 3 PID: 501900 Comm: aio-free-ring-w Kdump: loaded Not tainted 5.2.9-108_fbk12_rc3_3858_gb83b75af7909 #1
Hardware name: Wiwynn HoneyBadger/PantherPlus, BIOS HBM6.71 02/03/2016
Call Trace:
<IRQ>
dump_stack+0x46/0x60
nmi_cpu_backtrace.cold.3+0x13/0x50
? lapic_can_unplug_cpu.cold.27+0x34/0x34
nmi_trigger_cpumask_backtrace+0xba/0xca
rcu_dump_cpu_stacks+0x99/0xc7
rcu_sched_clock_irq.cold.87+0x1aa/0x397
? tick_sched_do_timer+0x60/0x60
update_process_times+0x28/0x60
tick_sched_timer+0x37/0x70
__hrtimer_run_queues+0xfe/0x270
hrtimer_interrupt+0xf4/0x210
smp_apic_timer_interrupt+0x5e/0x120
apic_timer_interrupt+0xf/0x20
</IRQ>
RIP: 0010:kmem_cache_free+0x223/0x300
Code: 88 00 00 00 0f 85 ca 00 00 00 41 8b 55 18 31 f6 f7 da 41 f6 45 0a 02 40 0f 94 c6 83 c6 05 9c 41 5e fa e8 a0 a7 01 00 41 56 9d <49> 8b 47 08 a8 03 0f 85 87 00 00 00 65 48 ff 08 e9 3d fe ff ff 65
RSP: 0018:ffffc9000e8e3da8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000020000 RBX: ffff88861b9de960 RCX: 0000000000000030
RDX: fffffffffffe41e8 RSI: 000060777fe3a100 RDI: 000000000001be18
RBP: ffffea00186e7780 R08: ffffffffffffffff R09: ffffffffffffffff
R10: ffff88861b9dea28 R11: ffff88887ffde000 R12: ffffffff81230a1f
R13: ffff888854684dc0 R14: 0000000000000206 R15: ffff8888547dbc00
? remove_vma+0x4f/0x60
remove_vma+0x4f/0x60
exit_mmap+0xd6/0x160
mmput+0x4a/0x110
do_exit+0x278/0xae0
? syscall_trace_enter+0x1d3/0x2b0
? handle_mm_fault+0xaa/0x1c0
do_group_exit+0x3a/0xa0
__x64_sys_exit_group+0x14/0x20
do_syscall_64+0x42/0x100
entry_SYSCALL_64_after_hwframe+0x44/0xa9
And on a PREEMPT=n kernel, the "while (vma)" loop in exit_mmap() can run
for a very long time given a large process. This commit therefore adds
a cond_resched() to this loop, providing RCU any needed quiescent states.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
mm/mmap.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/mmap.c b/mm/mmap.c
index bb1822ac99090..55bb456fd0d0f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3171,6 +3171,7 @@ void exit_mmap(struct mm_struct *mm)
if (vma->vm_flags & VM_ACCOUNT)
nr_accounted += vma_pages(vma);
vma = remove_vma(vma);
+ cond_resched();
}
vm_unacct_memory(nr_accounted);
}
--
2.25.1
next prev parent reply other threads:[~2020-08-10 19:28 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 19:09 [PATCH AUTOSEL 5.7 01/60] drm/tilcdc: fix leak & null ref in panel_connector_get_modes Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 02/60] soc: qcom: rpmh-rsc: Set suppress_bind_attrs flag Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 03/60] net: mscc: ocelot: fix encoding destination ports into multicast IPv4 address Sasha Levin
2020-08-10 21:01 ` Vladimir Oltean
2020-08-11 16:42 ` Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 04/60] ARM: exynos: clear L310_AUX_CTRL_FULL_LINE_ZERO in default l2c_aux_val Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 05/60] Bluetooth: add a mutex lock to avoid UAF in do_enale_set Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 06/60] loop: be paranoid on exit and prevent new additions / removals Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 07/60] io_uring: fix req->work corruption Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 08/60] fs/btrfs: Add cond_resched() for try_release_extent_mapping() stalls Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 09/60] drm/amdgpu: avoid dereferencing a NULL pointer Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 10/60] drm/radeon: Fix reference count leaks caused by pm_runtime_get_sync Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 11/60] crypto: aesni - Fix build with LLVM_IAS=1 Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 12/60] video: fbdev: savage: fix memory leak on error handling path in probe Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 13/60] video: fbdev: neofb: fix memory leak in neo_scan_monitor() Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 14/60] bus: ti-sysc: Add missing quirk flags for usb_host_hs Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 15/60] md-cluster: fix wild pointer of unlock_all_bitmaps() Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 16/60] drm/nouveau/kms/nv50-: Fix disabling dithering Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 17/60] arm64: dts: hisilicon: hikey: fixes to comply with adi, adv7533 DT binding Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 18/60] drm/etnaviv: fix ref count leak via pm_runtime_get_sync Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 19/60] memory: samsung: exynos5422-dmc: Do not ignore return code of regmap_read() Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 20/60] drm/nouveau: fix reference count leak in nouveau_debugfs_strap_peek Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 21/60] drm/nouveau: fix multiple instances of reference count leaks Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 22/60] mmc: sdhci-cadence: do not use hardware tuning for SD mode Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 23/60] btrfs: fix lockdep splat from btrfs_dump_space_info Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 24/60] usb: mtu3: clear dual mode of u3port when disable device Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 25/60] drm: msm: a6xx: fix gpu failure after system resume Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 26/60] drm/msm: Fix a null pointer access in msm_gem_shrinker_count() Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 27/60] drm/debugfs: fix plain echo to connector "force" attribute Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 28/60] drm/radeon: disable AGP by default Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 29/60] net: phy: mscc: restore the base page in vsc8514/8584_config_init Sasha Levin
2020-08-10 19:09 ` [PATCH AUTOSEL 5.7 30/60] irqchip/irq-mtk-sysirq: Replace spinlock with raw_spinlock Sasha Levin
2020-08-10 19:09 ` Sasha Levin [this message]
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 32/60] drm/amd/display: Improve DisplayPort monitor interop Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 33/60] drm/amdgpu/display bail early in dm_pp_get_static_clocks Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 34/60] drm/amdgpu/display: properly guard the calls to swSMU functions Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 35/60] drm/amd/powerplay: fix compile error with ARCH=arc Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 36/60] bpf: Fix fds_example SIGSEGV error Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 37/60] Bluetooth: hci_qca: Bug fixes for SSR Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 38/60] brcmfmac: keep SDIO watchdog running when console_interval is non-zero Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 39/60] brcmfmac: To fix Bss Info flag definition Bug Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 40/60] brcmfmac: set state of hanger slot to FREE when flushing PSQ Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 41/60] platform/x86: asus-nb-wmi: add support for ASUS ROG Zephyrus G14 and G15 Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 42/60] iwlegacy: Check the return value of pcie_capability_read_*() Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 43/60] gpu: host1x: debug: Fix multiple channels emitting messages simultaneously Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 44/60] drm/amd/powerplay: suppress compile error around BUG_ON Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 45/60] ionic: update eid test for overflow Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 46/60] x86/uaccess: Make __get_user_size() Clang compliant on 32-bit Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 47/60] mmc: sdhci-pci-o2micro: Bug fix for O2 host controller Seabird1 Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 48/60] usb: gadget: net2280: fix memory leak on probe error handling paths Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 49/60] bdc: Fix bug causing crash after multiple disconnects Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 50/60] usb: bdc: Halt controller on suspend Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 51/60] dyndbg: fix a BUG_ON in ddebug_describe_flags Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 52/60] dyndbg: prefer declarative init in caller, to memset in callee Sasha Levin
2020-08-11 5:13 ` Greg Kroah-Hartman
2020-08-15 23:07 ` Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 53/60] bcache: fix super block seq numbers comparision in register_cache_set() Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 54/60] btrfs: allow btrfs_truncate_block() to fallback to nocow for data space reservation Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 55/60] btrfs: qgroup: free per-trans reserved space when a subvolume gets dropped Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 56/60] ACPICA: Do not increment operation_region reference counts for field units Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 57/60] io_uring: fix racy overflow count reporting Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 58/60] io_uring: fix stalled deferred requests Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 59/60] crypto: caam - silence .setkey in case of bad key length Sasha Levin
2020-08-10 19:10 ` [PATCH AUTOSEL 5.7 60/60] drm/msm: ratelimit crtc event overflow error Sasha Levin
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