On 3/29/21 4:39 AM, Pavel Begunkov wrote: > general protection fault, probably for non-canonical address > 0xdffffc0000000018: 0000 [#1] KASAN: null-ptr-deref > in range [0x00000000000000c0-0x00000000000000c7] > RIP: 0010:io_commit_cqring+0x37f/0xc10 fs/io_uring.c:1318 > Call Trace: > io_kill_timeouts+0x2b5/0x320 fs/io_uring.c:8606 > io_ring_ctx_wait_and_kill+0x1da/0x400 fs/io_uring.c:8629 > io_uring_create fs/io_uring.c:9572 [inline] > io_uring_setup+0x10da/0x2ae0 fs/io_uring.c:9599 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > It can get into wait_and_kill() before setting up ctx->rings, and hence > io_commit_cqring() fails. Mimic poll cancel and do it only when we > completed events, there can't be any requests if it failed before > initialising rings. Thanks, applied. -- Jens Axboe
