From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Stefan Metzmacher <metze@samba.org>, Jens Axboe <axboe@kernel.dk>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.10 38/39] signal: don't allow STOP on PF_IO_WORKER threads
Date: Thu, 25 Mar 2021 07:25:57 -0400 [thread overview]
Message-ID: <20210325112558.1927423-38-sashal@kernel.org> (raw)
In-Reply-To: <20210325112558.1927423-1-sashal@kernel.org>
From: "Eric W. Biederman" <ebiederm@xmission.com>
[ Upstream commit 4db4b1a0d1779dc159f7b87feb97030ec0b12597 ]
Just like we don't allow normal signals to IO threads, don't deliver a
STOP to a task that has PF_IO_WORKER set. The IO threads don't take
signals in general, and have no means of flushing out a stop either.
Longer term, we may want to look into allowing stop of these threads,
as it relates to eg process freezing. For now, this prevents a spin
issue if a SIGSTOP is delivered to the parent task.
Reported-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/signal.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index 18ed1f853439..1d901a789812 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -288,7 +288,8 @@ bool task_set_jobctl_pending(struct task_struct *task, unsigned long mask)
JOBCTL_STOP_SIGMASK | JOBCTL_TRAPPING));
BUG_ON((mask & JOBCTL_TRAPPING) && !(mask & JOBCTL_PENDING_MASK));
- if (unlikely(fatal_signal_pending(task) || (task->flags & PF_EXITING)))
+ if (unlikely(fatal_signal_pending(task) ||
+ (task->flags & (PF_EXITING | PF_IO_WORKER))))
return false;
if (mask & JOBCTL_STOP_SIGMASK)
--
2.30.1
next prev parent reply other threads:[~2021-03-25 11:32 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 11:25 [PATCH AUTOSEL 5.10 01/39] virtiofs: Fail dax mount if device does not support it Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 02/39] ext4: shrink race window in ext4_should_retry_alloc() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 03/39] ext4: add reclaim checks to xattr code Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 04/39] fs/ext4: fix integer overflow in s_log_groups_per_flex Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 05/39] ext4: fix bh ref count on error paths Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 06/39] fs: nfsd: fix kconfig dependency warning for NFSD_V4 Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 07/39] rpc: fix NULL dereference on kmalloc failure Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 08/39] iomap: Fix negative assignment to unsigned sis->pages in iomap_swapfile_activate Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 09/39] ASoC: rt1015: fix i2c communication error Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 10/39] ASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10 Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 11/39] ASoC: rt5651: " Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 12/39] ASoC: sgtl5000: set DAP_AVC_CTRL register to correct default value on probe Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 13/39] ASoC: es8316: Simplify adc_pga_gain_tlv table Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 14/39] ASoC: soc-core: Prevent warning if no DMI table is present Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 15/39] ASoC: cs42l42: Fix Bitclock polarity inversion Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 16/39] ASoC: cs42l42: Fix channel width support Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 17/39] ASoC: cs42l42: Fix mixer volume control Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 18/39] ASoC: cs42l42: Always wait at least 3ms after reset Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 19/39] NFSD: fix error handling in NFSv4.0 callbacks Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 20/39] kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 21/39] powerpc: Force inlining of cpu_has_feature() to avoid build failure Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 22/39] vhost: Fix vhost_vq_reset() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 23/39] io_uring: fix ->flags races by linked timeouts Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 24/39] scsi: st: Fix a use after free in st_open() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 25/39] scsi: qla2xxx: Fix broken #endif placement Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 26/39] staging: comedi: cb_pcidas: fix request_irq() warn Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 27/39] staging: comedi: cb_pcidas64: " Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 28/39] ASoC: rt5659: Update MCLK rate in set_sysclk() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 29/39] ASoC: rt711: add snd_soc_component remove callback Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 30/39] thermal/core: Add NULL pointer check before using cooling device stats Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 31/39] locking/ww_mutex: Simplify use_ww_ctx & ww_ctx handling Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 32/39] locking/ww_mutex: Fix acquire/release imbalance in ww_acquire_init()/ww_acquire_fini() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 33/39] nvmet-tcp: fix kmap leak when data digest in use Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 34/39] io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 35/39] static_call: Align static_call_is_init() patching condition Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 36/39] ext4: do not iput inode under running transaction in ext4_rename() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 37/39] signal: don't allow sending any signals to PF_IO_WORKER threads Sasha Levin
2021-03-25 11:25 ` Sasha Levin [this message]
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 39/39] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with MSG_WAITALL Sasha Levin
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