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 5.11 43/44] signal: don't allow STOP on PF_IO_WORKER threads
Date: Thu, 25 Mar 2021 07:24:58 -0400 [thread overview]
Message-ID: <20210325112459.1926846-43-sashal@kernel.org> (raw)
In-Reply-To: <20210325112459.1926846-1-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 55526b941011..00a3840f6037 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 11:29 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 11:24 [PATCH AUTOSEL 5.11 01/44] virtiofs: Fail dax mount if device does not support it Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 02/44] ext4: shrink race window in ext4_should_retry_alloc() Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 03/44] ext4: add reclaim checks to xattr code Sasha Levin
2021-03-25 14:30 ` Jan Kara
2021-03-30 21:14 ` Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 04/44] fs/ext4: fix integer overflow in s_log_groups_per_flex Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 05/44] ext4: fix bh ref count on error paths Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 06/44] fs: nfsd: fix kconfig dependency warning for NFSD_V4 Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 07/44] rpc: fix NULL dereference on kmalloc failure Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 08/44] iomap: Fix negative assignment to unsigned sis->pages in iomap_swapfile_activate Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 09/44] ASoC: rt1015: fix i2c communication error Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 10/44] ASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10 Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 11/44] ASoC: rt5651: " Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 12/44] ASoC: sgtl5000: set DAP_AVC_CTRL register to correct default value on probe Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 13/44] ASoC: es8316: Simplify adc_pga_gain_tlv table Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 14/44] ASoC: soc-core: Prevent warning if no DMI table is present Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 15/44] ASoC: cs42l42: Fix Bitclock polarity inversion Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 16/44] ASoC: cs42l42: Fix channel width support Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 17/44] ASoC: cs42l42: Fix mixer volume control Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 18/44] ASoC: cs42l42: Always wait at least 3ms after reset Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 19/44] NFSD: fix error handling in NFSv4.0 callbacks Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 20/44] ASoC: mediatek: mt8192: fix tdm out data is valid on rising edge Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 21/44] kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 22/44] powerpc: Force inlining of cpu_has_feature() to avoid build failure Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 23/44] vhost: Fix vhost_vq_reset() Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 24/44] io_uring: fix ->flags races by linked timeouts Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 25/44] io_uring: halt SQO submission on ctx exit Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 26/44] btrfs: track qgroup released data in own variable in insert_prealloc_file_extent Sasha Levin
2021-03-25 12:08 ` David Sterba
2021-03-30 21:15 ` Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 27/44] scsi: st: Fix a use after free in st_open() Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 28/44] scsi: qla2xxx: Fix broken #endif placement Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 29/44] staging: comedi: cb_pcidas: fix request_irq() warn Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 30/44] staging: comedi: cb_pcidas64: " Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 31/44] ASoC: rt5659: Update MCLK rate in set_sysclk() Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 32/44] ASoC: rt711: add snd_soc_component remove callback Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 33/44] thermal/core: Add NULL pointer check before using cooling device stats Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 34/44] locking/ww_mutex: Simplify use_ww_ctx & ww_ctx handling Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 35/44] locking/ww_mutex: Fix acquire/release imbalance in ww_acquire_init()/ww_acquire_fini() Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 36/44] nvmet-tcp: fix kmap leak when data digest in use Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 37/44] io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 38/44] Revert "PM: ACPI: reboot: Use S5 for reboot" Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 39/44] nouveau: Skip unvailable ttm page entries Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 40/44] static_call: Align static_call_is_init() patching condition Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 41/44] ext4: do not iput inode under running transaction in ext4_rename() Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 42/44] signal: don't allow sending any signals to PF_IO_WORKER threads Sasha Levin
2021-03-25 11:32 ` Stefan Metzmacher
2021-03-25 11:24 ` Sasha Levin [this message]
2021-03-25 11:34 ` [PATCH AUTOSEL 5.11 43/44] signal: don't allow STOP on " Stefan Metzmacher
2021-03-25 12:04 ` Eric W. Biederman
2021-03-25 12:11 ` Stefan Metzmacher
2021-03-25 13:38 ` Jens Axboe
2021-03-25 13:56 ` Stefan Metzmacher
2021-03-25 14:02 ` Jens Axboe
2021-03-25 15:00 ` Sasha Levin
2021-03-25 15:10 ` Jens Axboe
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 44/44] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with MSG_WAITALL Sasha Levin
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