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- Feb 08, 2023
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Jens Axboe authored
[ Upstream commit 2587890b ] This reverts commit 0d4370cf. No longer needed, as the io-wq worker threads have the right identity. Change-Id: I7a28e02a0a1911555853cf4046e3a09c7e36d4a2 Signed-off-by:
Jens Axboe <axboe@kernel.dk> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> (cherry picked from commit 87cb08dc) Bug: 268174392 Signed-off-by:
Greg Kroah-Hartman <gregkh@google.com>
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Jens Axboe authored
[ Upstream commit e5493796 ] No need to restrict these anymore, as the worker threads are direct clones of the original task. Hence we know for a fact that we can support anything that the regular task can. Since the only user of proto_ops->flags was to flag PROTO_CMSG_DATA_ONLY, kill the member and the flag definition too. Change-Id: Ie87e4ff3c621cf53a8e9589a7689e62d759de983 Signed-off-by:
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Jens Axboe authored
[ Upstream commit 35d0b389 ] Song reported a boot regression in a kvm image with 5.11-rc, and bisected it down to the below patch. Debugging this issue, turns out that the boot stalled when a task is waiting on a pipe being released. As we no longer run task_work from get_signal() unless it's queued with TWA_SIGNAL, the task goes idle without running the task_work. This prevents ->release() from being called on the pipe, which another boot task is waiting on. For now, re-instate the unconditional task_work run from get_signal(). For 5.12, we'll collapse TWA_RESUME and TWA_SIGNAL, as it no longer makes sense to have a distinction between the two. This will turn task_work notification into a simple boolean, whether to notify or not. Fixes: 98b89b64 ("signal: kill JOBCTL_TASK_WORK") Reported-by:
Song Liu <songliubraving@fb.com> Tested-by:
John Stultz <john.stultz@linaro.org> Tested-by:
Douglas Anderson <dianders@chromium.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM/Clang version 11.0.1 Change-Id: Id5ce292120cafff9ede9bb7421cde3aaf4e56924 Signed-off-by:
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Jens Axboe authored
[ Upstream commit 98b89b64 ] It's no longer used, get rid of it. Change-Id: Id14379554f3e1085c63ac4d044618f609ebc2f9f Signed-off-by:
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Jens Axboe authored
No upstream commit exists. This imports the io_uring codebase from 5.15.85, wholesale. Changes from that code base: - Drop IOCB_ALLOC_CACHE, we don't have that in 5.10. - Drop MKDIRAT/SYMLINKAT/LINKAT. Would require further VFS backports, and we don't support these in 5.10 to begin with. - sock_from_file() old style calling convention. - Use compat_get_bitmap() only for CONFIG_COMPAT=y Change-Id: I7ce5226d6b39763ffc246fd6357cece9aafd4b59 Signed-off-by:
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Jens Axboe authored
[ Upstream commit c7aab1a7 ] The only exported helper we have right now is task_work_cancel(), which cancels any task_work from a given task where func matches the queued work item. This is a bit too coarse for some use cases. Add a task_work_cancel_match() that allows to more specifically target individual work items outside of purely the callback function used. task_work_cancel() can be trivially implemented on top of that, hence do so. Reviewed-by:
Oleg Nesterov <oleg@redhat.com> Change-Id: Ia33480d209b26d433a3ca196972d6931aa4f8dde Signed-off-by:
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Jens Axboe authored
[ Upstream commit 10442994 ] Right now we're never calling get_signal() from PF_IO_WORKER threads, but in preparation for doing so, don't handle a fatal signal for them. The workers have state they need to cleanup when exiting, so just return instead of calling do_exit() on their behalf. The threads themselves will detect a fatal signal and do proper shutdown. Change-Id: Iedc3fae8cb496d003852c87fdefacc1ad7601cc5 Signed-off-by:
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Jens Axboe authored
[ Upstream commit b16b3855 ] This is racy - move the blocking into when the task is created and we're marking it as PF_IO_WORKER anyway. The IO threads are now prepared to handle signals like SIGSTOP as well, so clear that from the mask to allow proper stopping of IO threads. Acked-by:
"Eric W. Biederman" <ebiederm@xmission.com> Reported-by:
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Stefan Metzmacher authored
[ Upstream commit 50b7b6f2 ] As io_threads are fully set up USER threads it's clearer to separate the code path from the KTHREAD logic. The only remaining difference to user space threads is that io_threads never return to user space again. Instead they loop within the given worker function. The fact that they never return to user space means they don't have an user space thread stack. In order to indicate that to tools like gdb we reset the stack and instruction pointers to 0. This allows gdb attach to user space processes using io-uring, which like means that they have io_threads, without printing worrying message like this: warning: Selected architecture i386:x86-64 is not compatible with reported target architecture i386 warning: Architecture rejected target-supplied description The output will be something like this: (gdb) info threads Id Target Id Frame * 1 LWP 4863 "io_uring-cp-for" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38 2 LWP 4864 "iou-mgr-4863" 0x0000000000000000 in ?? () 3 LWP 4865 "iou-wrk-4863" 0x0000000000000000 in ?? () (gdb) thread 3 [Switching to thread 3 (LWP 4865)] #0 0x0000000000000000 in ?? () (gdb) bt #0 0x0000000000000000 in ?? () Backtrace stopped: Cannot access memory at address 0x0 Fixes: 4727dc20 ("arch: setup PF_IO_WORKER threads like PF_KTHREAD") Link: https://lore.kernel.org/io-uring/044d0bad-6888-a211-e1d3-159a4aeed52d@polymtl.ca/T/#m1bbf5727e3d4e839603f6ec7ed79c7eebfba6267 Change-Id: I83793e9a4fbc5f9024c9aeace0640043c81a93b0 Signed-off-by:
Stefan Metzmacher <metze@samba.org> cc: Linus Torvalds <torvalds@linux-foundation.org> cc: Jens Axboe <axboe@kernel.dk> cc: Andy Lutomirski <luto@kernel.org> cc: linux-kernel@vger.kernel.org cc: io-uring@vger.kernel.org cc: x86@kernel.org Link: https://lore.kernel.org/r/20210505110310.237537-1-metze@samba.org Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Jens Axboe authored
[ Upstream commit 0100e6bb ] In the arch addition of PF_IO_WORKER, I missed parisc and powerpc for some reason. Fix that up, ensuring they handle PF_IO_WORKER like they do PF_KTHREAD in copy_thread(). Reported-by:
Bruno Goncalves <bgoncalv@redhat.com> Fixes: 4727dc20 ("arch: setup PF_IO_WORKER threads like PF_KTHREAD") Change-Id: I3d0289912eb9e4545fc0b680df6890b6b837ebdd Signed-off-by:
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Jens Axboe authored
[ Upstream commit 4727dc20 ] PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the sense that we don't assign ->set_child_tid with our own structure. Just ensure that every arch sets up the PF_IO_WORKER threads like kthreads in the arch implementation of copy_thread(). Change-Id: Iec4a3c42a39f016b323476d7238f3d36aaf0e6cf Signed-off-by:
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Seth Forshee authored
[ Upstream commit 3e684903 ] A livepatch transition may stall indefinitely when a kvm vCPU is heavily loaded. To the host, the vCPU task is a user thread which is spending a very long time in the ioctl(KVM_RUN) syscall. During livepatch transition, set_notify_signal() will be called on such tasks to interrupt the syscall so that the task can be transitioned. This interrupts guest execution, but when xfer_to_guest_mode_work() sees that TIF_NOTIFY_SIGNAL is set but not TIF_SIGPENDING it concludes that an exit to user mode is unnecessary, and guest execution is resumed without transitioning the task for the livepatch. This handling of TIF_NOTIFY_SIGNAL is incorrect, as set_notify_signal() is expected to break tasks out of interruptible kernel loops and cause them to return to userspace. Change xfer_to_guest_mode_work() to handle TIF_NOTIFY_SIGNAL the same as TIF_SIGPENDING, signaling to the vCPU run loop that an exit to userpsace is needed. Any pending task_work will be run when get_signal() is called from exit_to_user_mode_loop(), so there is no longer any need to run task work from xfer_to_guest_mode_work(). Suggested-by:
Seth Forshee <sforshee@digitalocean.com> Message-Id: <20220504180840.2907296-1-sforshee@digitalocean.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Jens Axboe authored
[ Upstream commit 66ae0d1e ] fork() fails if signal_pending() is true, but there are two conditions that can lead to that: 1) An actual signal is pending. We want fork to fail for that one, like we always have. 2) TIF_NOTIFY_SIGNAL is pending, because the task has pending task_work. We don't need to make it fail for that case. Allow fork() to proceed if just task_work is pending, by changing the signal_pending() check to task_sigpending(). Change-Id: Iec007746b42f5d62581a8b5f6cca4006e707b8e3 Signed-off-by:
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Eric W. Biederman authored
[ Upstream commit 06af8679 ] Olivier Langlois has been struggling with coredumps being incompletely written in processes using io_uring. Olivier Langlois <olivier@trillion01.com> writes: > io_uring is a big user of task_work and any event that io_uring made a > task waiting for that occurs during the core dump generation will > generate a TIF_NOTIFY_SIGNAL. > > Here are the detailed steps of the problem: > 1. io_uring calls vfs_poll() to install a task to a file wait queue > with io_async_wake() as the wakeup function cb from io_arm_poll_handler() > 2. wakeup function ends up calling task_work_add() with TWA_SIGNAL > 3. task_work_add() sets the TIF_NOTIFY_SIGNAL bit by calling > set_notify_signal() The coredump code deliberately supports being interrupted by SIGKILL, and depends upon prepare_signal to filter out all other signals. Now that signal_pending includes wake ups for TIF_NOTIFY_SIGNAL this hack in dump_emitted by the coredump code no longer works. Make the coredump code more robust by explicitly testing for all of the wakeup conditions the coredump code supports. This prevents new wakeup conditions from breaking the coredump code, as well as fixing the current issue. The filesystem code that the coredump code uses already limits itself to only aborting on fatal_signal_pending. So it should not develop surprising wake-up reasons either. v2: Don't remove the now unnecessary code in prepare_signal. Cc: stable@vger.kernel.org Fixes: 12db8b69 ("entry: Add support for TIF_NOTIFY_SIGNAL") Reported-by:
Olivier Langlois <olivier@trillion01.com> Change-Id: I84870bf0a620a97af50d9b495dd225f9ee2b66b8 Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Jens Axboe authored
[ Upstream commit e296dc49 ] It's available everywhere now, no need to check or add dummy defines. Change-Id: I2e0950c13a90b463b848bb6bc095db02ae08a8cd Signed-off-by:
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Jens Axboe authored
[ Upstream commit 03941ccf ] All archs now support TIF_NOTIFY_SIGNAL. Change-Id: I3fc938645ac7be18300432713909ccfaa7cd2711 Signed-off-by:
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Al Viro authored
[ Upstream commit e2c7554c ] it needs to be added to _TIF_WORK_MASK, or we might not reach do_work_pending() in the first place... Fixes: 5a9a8897 "alpha: add support for TIF_NOTIFY_SIGNAL" Change-Id: I9f19ad6bc9833ce0cc103163af7904862425badb Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Vineet Gupta authored
[ Upstream commit bb12433b ] Linux 5.11.rcX was failing to boot on ARC HSDK board. Turns out we have a couple of issues, this being the first one, and I'm to blame as I didn't pay attention during review. TIF_NOTIFY_SIGNAL support requires checking multiple TIF_* bits in kernel return code path. Old code only needed to check a single bit so BBIT0 <TIF_SIGPENDING> worked. New code needs to check multiple bits so AND <bit-mask> instruction. So needs to use bit mask variant _TIF_SIGPENDING Cc: Jens Axboe <axboe@kernel.dk> Fixes: 53855e12 ("arc: add support for TIF_NOTIFY_SIGNAL") Link: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/34 Change-Id: I00aa9a6c3118f72e90575fb7ca4ebc08300b542e Signed-off-by:
Vineet Gupta <vgupta@synopsys.com> Signed-off-by:
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Jens Axboe authored
[ Upstream commit f5f4fc46 ] Sergei and John both reported that ia64 failed to boot in 5.11, and it was related to signals. Turns out the ia64 signal handling is a bit odd, it doesn't check the return value of get_signal() for whether there's a signal to deliver or not. With the introduction of TIF_NOTIFY_SIGNAL, then task_work could trigger it. Fix it by only calling handle_signal() if we actually have a real signal to deliver. This brings it in line with all other archs, too. Fixes: b269c229 ("ia64: add support for TIF_NOTIFY_SIGNAL") Reported-by:
Sergei Trofimovich <slyich@gmail.com> Reported-by:
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Tested-by:
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Jens Axboe authored
[ Upstream commit f50a7052 ] Wire up TIF_NOTIFY_SIGNAL handling for sparc. Cc: sparclinux@vger.kernel.org Change-Id: I6dc91c146efed1287ead67fa44db9185576cbce8 Signed-off-by:
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Jens Axboe authored
[ Upstream commit 24a31b81 ] Wire up TIF_NOTIFY_SIGNAL handling for riscv. Cc: linux-riscv@lists.infradead.org Change-Id: Ia1d9bc9779bf2935dc5a7c83e86261123d4d6b0f Signed-off-by:
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Jens Axboe authored
[ Upstream commit b13e8bf6 ] Wire up TIF_NOTIFY_SIGNAL handling for nds32. Cc: Nick Hu <nickhu@andestech.com> Cc: Greentime Hu <green.hu@gmail.com> Cc: Vincent Chen <deanbo422@gmail.com> Change-Id: Ic184206ffc5c6981fb590eb0103bc2f623f5402d Signed-off-by:
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Jens Axboe authored
[ Upstream commit b269c229 ] Wire up TIF_NOTIFY_SIGNAL handling for ia64. Cc: linux-ia64@vger.kernel.org [axboe: added fixes from Mike Rapoport <rppt@kernel.org>] Change-Id: Ib1e6bb561f1a6ddf9be818d35e295b53f0d1f1fd Signed-off-by:
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Jens Axboe authored
[ Upstream commit 2f9799ad ] Wire up TIF_NOTIFY_SIGNAL handling for h8300. Cc: uclinux-h8-devel@lists.sourceforge.jp Change-Id: Ibd30f09fc25229b5a410ec37485aac0a188ff717 Signed-off-by:
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Jens Axboe authored
[ Upstream commit 6d665a4d ] Wire up TIF_NOTIFY_SIGNAL handling for c6x. Cc: linux-c6x-dev@linux-c6x.org Change-Id: I0e38ee478eff25064bb03277a29ba273b0656b28 Signed-off-by:
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Jens Axboe authored
[ Upstream commit 5a9a8897 ] Wire up TIF_NOTIFY_SIGNAL handling for alpha. Cc: linux-alpha@vger.kernel.org Change-Id: I44b3be73e9a332bfc92b8f5c34426770c9642dae Signed-off-by:
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Jens Axboe authored
[ Upstream commit bec58f40 ] Wire up TIF_NOTIFY_SIGNAL handling for xtensa. Thanks to Max Filippov <jcmvbkbc@gmail.com> for making the asm correct. Cc: linux-xtensa@linux-xtensa.org Change-Id: I246a2ab88d6fe797d5e067d3b6515cf787ba19cf Signed-off-by:
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Jens Axboe authored
[ Upstream commit 32d59773 ] Wire up TIF_NOTIFY_SIGNAL handling for arm. Cc: linux-arm-kernel@lists.infradead.org Acked-by:
Russell King <rmk+kernel@armlinux.org.uk> Change-Id: Ic1385829b4c4b28cb4b1f82595fd0b2acb9ec9eb Signed-off-by:
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Jens Axboe authored
[ Upstream commit f4ea089e ] Wire up TIF_NOTIFY_SIGNAL handling for microblaze. Acked-by:
Michal Simek <michal.simek@xilinx.com> Change-Id: I6540230d4b04069323371351dde3d9c964b80058 Signed-off-by:
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Jens Axboe authored
[ Upstream commit aeec8193 ] Wire up TIF_NOTIFY_SIGNAL handling for hexagon. Cc: linux-hexagon@vger.kernel.org Acked-by:
Brian Cain <bcain@codeaurora.org> Change-Id: I68ddb4388560d3caa828b12912da7d54ff42df10 Signed-off-by:
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Jens Axboe authored
[ Upstream commit f3924d76 ] Wire up TIF_NOTIFY_SIGNAL handling for csky. Cc: linux-csky@vger.kernel.org Acked-by:
Guo Ren <guoren@kernel.org> Change-Id: I5aeedb22a46f89abfd86283dd1067c8ad9a5ee4a Signed-off-by:
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Jens Axboe authored
[ Upstream commit e181c0aa ] Wire up TIF_NOTIFY_SIGNAL handling for openrisc. Cc: openrisc@lists.librecores.org Acked-by:
Stafford Horne <shorne@gmail.com> Change-Id: I664b804e2b20332f1c529bca7e083c62e95e6d9f Signed-off-by:
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Jens Axboe authored
[ Upstream commit 6d3a2733 ] Wire up TIF_NOTIFY_SIGNAL handling for sh. Cc: linux-sh@vger.kernel.org Change-Id: If469e4a57e80bb31d749ca571d4039fc1680732e Signed-off-by:
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Jens Axboe authored
[ Upstream commit a5b3cd32 ] Wire up TIF_NOTIFY_SIGNAL handling for um. Cc: linux-um@lists.infradead.org Acked-By:
Anton Ivanov <anton.ivanov@cambridgegreys.com> Change-Id: Idc702390f1ba7575230aa4c81d27f80088b17afc Signed-off-by:
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Jens Axboe authored
[ Upstream commit 75309018 ] Wire up TIF_NOTIFY_SIGNAL handling for s390. Cc: linux-s390@vger.kernel.org Acked-by:
Heiko Carstens <hca@linux.ibm.com> Acked-by:
Sven Schnelle <svens@linux.ibm.com> Change-Id: I070ab3e37c109b36a2a0134b5548f424f4877dd4 Signed-off-by:
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Jens Axboe authored
[ Upstream commit f45c184b ] Wire up TIF_NOTIFY_SIGNAL handling for mips. Cc: linux-mips@vger.kernel.org Acked-By:
Thomas Bogendoerfer <tsbogend@alpha.franken.de> Change-Id: Ie72b5e65361dee9ab5c8059bde16a3dd0181ca07 Signed-off-by:
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Jens Axboe authored
[ Upstream commit 900f0713 ] Wire up TIF_NOTIFY_SIGNAL handling for powerpc. Cc: linuxppc-dev@lists.ozlabs.org Acked-by:
Michael Ellerman <mpe@ellerman.id.au> Change-Id: I30a11c05453437854c2a64be214ae557f04d2cea Signed-off-by:
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Jens Axboe authored
[ Upstream commit 18cb3281 ] Wire up TIF_NOTIFY_SIGNAL handling for parisc. Cc: linux-parisc@vger.kernel.org Acked-by:
Helge Deller <deller@gmx.de> Change-Id: Iaa3f0b072f528bf500dc9a10901b5791eb38623f Signed-off-by:
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Jens Axboe authored
[ Upstream commit 42020064 ] Wire up TIF_NOTIFY_SIGNAL handling for nios32. Cc: Ley Foon Tan <ley.foon.tan@intel.com> Acked-by:
Ley Foon Tan <ley.foon.tan@intel.com> Change-Id: I11eed799c048247128e1acfb241f97cc3703d5b2 Signed-off-by:
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Jens Axboe authored
[ Upstream commit e660653c ] Wire up TIF_NOTIFY_SIGNAL handling for m68k. Cc: linux-m68k@lists.linux-m68k.org Acked-by:
Geert Uytterhoeven <geert@linux-m68k.org> Change-Id: I28d2f9d79486d8728ff0127cd24a64dbb9b2de68 Signed-off-by:
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