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Registered in England and Wales under Company Registration No. 3798903 In-Reply-To: <161340385320.1303470.2392622971006879777.stgit@warthog.procyon.org.uk> References: <161340385320.1303470.2392622971006879777.stgit@warthog.procyon.org.uk> To: Trond Myklebust Cc: dhowells@redhat.com, Marc Dionne , Anna Schumaker , Steve French , Dominique Martinet , linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, Jeff Layton , Matthew Wilcox , linux-cachefs@redhat.com, Alexander Viro , linux-mm@kvack.org, linux-afs@lists.infradead.org, v9fs-developer@lists.sourceforge.net, Christoph Hellwig , linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, Jeff Layton , David Wysochanski , linux-kernel@vger.kernel.org Subject: [PATCH 34/33] netfs: Use in_interrupt() not in_softirq() From: David Howells MIME-Version: 1.0 Content-ID: <1376937.1613429183.1@warthog.procyon.org.uk> Date: Mon, 15 Feb 2021 22:46:23 +0000 Message-ID: <1376938.1613429183@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The in_softirq() in netfs_rreq_terminated() works fine for the cache being on a normal disk, as the completion handlers may get called in softirq context, but for an NVMe drive, the completion handler may get called in IRQ context. Fix to use in_interrupt() instead of in_softirq() throughout the read helpers, particularly when deciding whether to punt code that might sleep off to a worker thread. The symptom involves warnings like the following appearing and the kernel hanging: WARNING: CPU: 0 PID: 0 at kernel/softirq.c:175 __local_bh_enable_ip+0x35/0x50 ... RIP: 0010:__local_bh_enable_ip+0x35/0x50 ... Call Trace: rxrpc_kernel_begin_call+0x7d/0x1b0 [rxrpc] ? afs_rx_new_call+0x40/0x40 [kafs] ? afs_alloc_call+0x28/0x120 [kafs] afs_make_call+0x120/0x510 [kafs] ? afs_rx_new_call+0x40/0x40 [kafs] ? afs_alloc_flat_call+0xba/0x100 [kafs] ? __kmalloc+0x167/0x2f0 ? afs_alloc_flat_call+0x9b/0x100 [kafs] afs_wait_for_operation+0x2d/0x200 [kafs] afs_do_sync_operation+0x16/0x20 [kafs] afs_req_issue_op+0x8c/0xb0 [kafs] netfs_rreq_assess+0x125/0x7d0 [netfs] ? cachefiles_end_operation+0x40/0x40 [cachefiles] netfs_subreq_terminated+0x117/0x220 [netfs] cachefiles_read_complete+0x21/0x60 [cachefiles] iomap_dio_bio_end_io+0xdd/0x110 blk_update_request+0x20a/0x380 blk_mq_end_request+0x1c/0x120 nvme_process_cq+0x159/0x1f0 [nvme] nvme_irq+0x10/0x20 [nvme] __handle_irq_event_percpu+0x37/0x150 handle_irq_event+0x49/0xb0 handle_edge_irq+0x7c/0x200 asm_call_irq_on_stack+0xf/0x20 common_interrupt+0xad/0x120 asm_common_interrupt+0x1e/0x40 ... Reported-by: Marc Dionne Signed-off-by: David Howells cc: Matthew Wilcox cc: linux-mm@kvack.org cc: linux-cachefs@redhat.com cc: linux-afs@lists.infradead.org cc: linux-nfs@vger.kernel.org cc: linux-cifs@vger.kernel.org cc: ceph-devel@vger.kernel.org cc: v9fs-developer@lists.sourceforge.net cc: linux-fsdevel@vger.kernel.org --- read_helper.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c index 9191a3617d91..db582008b4bd 100644 --- a/fs/netfs/read_helper.c +++ b/fs/netfs/read_helper.c @@ -96,7 +96,7 @@ static void netfs_free_read_request(struct work_struct *work) static void netfs_put_read_request(struct netfs_read_request *rreq) { if (refcount_dec_and_test(&rreq->usage)) { - if (in_softirq()) { + if (in_interrupt()) { rreq->work.func = netfs_free_read_request; if (!queue_work(system_unbound_wq, &rreq->work)) BUG(); @@ -353,7 +353,7 @@ static void netfs_rreq_write_to_cache_work(struct work_struct *work) static void netfs_rreq_write_to_cache(struct netfs_read_request *rreq) { - if (in_softirq()) { + if (in_interrupt()) { rreq->work.func = netfs_rreq_write_to_cache_work; if (!queue_work(system_unbound_wq, &rreq->work)) BUG(); @@ -479,7 +479,7 @@ static bool netfs_rreq_perform_resubmissions(struct netfs_read_request *rreq) { struct netfs_read_subrequest *subreq; - WARN_ON(in_softirq()); + WARN_ON(in_interrupt()); trace_netfs_rreq(rreq, netfs_rreq_trace_resubmit); @@ -577,7 +577,7 @@ static void netfs_rreq_work(struct work_struct *work) static void netfs_rreq_terminated(struct netfs_read_request *rreq) { if (test_bit(NETFS_RREQ_INCOMPLETE_IO, &rreq->flags) && - in_softirq()) { + in_interrupt()) { if (!queue_work(system_unbound_wq, &rreq->work)) BUG(); } else {