Oleg Nesterov e8fe3f07a3 9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN ... p9_read_work() doesn't set Rworksched and doesn't do schedule_work(m->rq) if list_empty(&m->req_list). However, if the pipe is full, we need to read more data and this used to work prior to commit aaec5a95d5 ("pipe_read: don't wake up the writer if the pipe is still full"). p9_read_work() does p9_fd_read() -> ... -> anon_pipe_read() which (before the commit above) triggered the unnecessary wakeup. This wakeup calls p9_pollwake() which kicks p9_poll_workfn() -> p9_poll_mux(), p9_poll_mux() will notice EPOLLIN and schedule_work(&m->rq). This no longer happens after the optimization above, change p9_fd_request() to use p9_poll_mux() instead of only checking for EPOLLOUT. Reported-by: syzbot+d1b5dace43896bc386c3@syzkaller.appspotmail.com Tested-by: syzbot+d1b5dace43896bc386c3@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/68a2de8f.050a0220.e29e5.0097.GAE@google.com/ Link: https://lore.kernel.org/all/67dedd2f.050a0220.31a16b.003f.GAE@google.com/ Co-developed-by: K Prateek Nayak <kprateek.nayak@amd.com> Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Message-ID: <20250819161013.GB11345@redhat.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>		2025-09-19 16:34:51 +09:00
..
client.c	netfs: Fix the request's work item to not require a ref	2025-05-21 14:35:20 +02:00
error.c	9p: Use hashtable.h for hash_errmap	2025-03-23 06:20:48 +09:00
Kconfig	net/9p/usbg: allow building as standalone module	2024-11-22 23:48:14 +09:00
Makefile	net/9p/usbg: Add new usb gadget function transport	2024-09-03 09:57:08 +02:00
mod.c	net/p9: load default transports	2022-01-10 10:00:09 +09:00
protocol.c	net: 9p: avoid freeing uninit memory in p9pdu_vreadf	2023-12-13 05:44:30 +09:00
protocol.h	net/9p: add p9_msg_buf_size()	2022-10-05 07:05:41 +09:00
trans_common.c	9p: fix file headers	2021-11-03 17:45:04 +09:00
trans_common.h	9p: fix a bunch of checkpatch warnings	2021-11-04 21:04:25 +09:00
trans_fd.c	9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN	2025-09-19 16:34:51 +09:00
trans_rdma.c	9p/rdma: unmap receive dma buffer in rdma_request()/post_recv()	2023-02-24 13:42:28 +00:00
trans_usbg.c	net/9p: Fix buffer overflow in USB transport layer	2025-08-23 15:34:46 +09:00
trans_virtio.c	net: 9p: virtio: drop owner assignment	2024-05-22 08:31:17 -04:00
trans_xen.c	9p/xen: fix release of IRQ	2024-11-22 23:36:19 +09:00