----- Original Message ----- > From: "CAI Qian" <caiqian@xxxxxxxxxx> > To: "Al Viro" <viro@xxxxxxxxxxxxxxxxxx> > Cc: "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "Dave Chinner" <david@xxxxxxxxxxxxx>, "linux-xfs" > <linux-xfs@xxxxxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxxxx>, "Nick Piggin" <npiggin@xxxxxxxxx>, > linux-fsdevel@xxxxxxxxxxxxxxx > Sent: Monday, October 3, 2016 10:06:27 AM > Subject: Re: [RFC][CFT] splice_read reworked > > > > ----- Original Message ----- > > From: "Al Viro" <viro@xxxxxxxxxxxxxxxxxx> > > To: "CAI Qian" <caiqian@xxxxxxxxxx> > > Cc: "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "Dave Chinner" > > <david@xxxxxxxxxxxxx>, "linux-xfs" > > <linux-xfs@xxxxxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxxxx>, "Nick Piggin" > > <npiggin@xxxxxxxxx>, > > linux-fsdevel@xxxxxxxxxxxxxxx > > Sent: Sunday, October 2, 2016 9:42:18 PM > > Subject: Re: [RFC][CFT] splice_read reworked > > > > On Fri, Sep 30, 2016 at 01:42:17PM -0400, CAI Qian wrote: > > > > > [ 1599.151286] ------------[ cut here ]------------ > > > [ 1599.156457] WARNING: CPU: 37 PID: 95143 at lib/iov_iter.c:316 > > > sanity+0x75/0x80 > > > > [snip] > > > > > [ 1599.344171] [<ffffffff813e9b45>] sanity+0x75/0x80 > > > [ 1599.349518] [<ffffffff813ec739>] copy_page_to_iter+0xf9/0x1e0 > > > [ 1599.356027] [<ffffffff8120691f>] shmem_file_read_iter+0x9f/0x340 > > > [ 1599.362829] [<ffffffff812bbeb9>] generic_file_splice_read+0xb9/0x1b0 > > > [ 1599.370015] [<ffffffff812bc206>] do_splice_to+0x76/0x90 > > > [ 1599.375941] [<ffffffff812bc2db>] splice_direct_to_actor+0xbb/0x220 > > > [ 1599.382935] [<ffffffff812bba80>] ? generic_pipe_buf_nosteal+0x10/0x10 > > > [ 1599.390220] [<ffffffff812bc4d8>] do_splice_direct+0x98/0xd0 > > > [ 1599.396537] [<ffffffff81281dd1>] do_sendfile+0x1d1/0x3b0 > > > [ 1599.402563] [<ffffffff81282973>] SyS_sendfile64+0x73/0xd0 > > > [ 1599.408685] [<ffffffff81003f8c>] do_syscall_64+0x6c/0x1e0 > > > [ 1599.414820] [<ffffffff817d927f>] entry_SYSCALL64_slow_path+0x25/0x25 > > > > IOW, sendfile from shmem... How easily is that reproduced (IOW, did you > > get any more of those)? > > > It is pretty reproducible so far by just running the trinity from a docker > container backed by overlayfs/xfs. > > # su - test > $ trinity Also, AFACIT, this is NOT reproducible on v4.8 mainline, but only with this splice_read reworked branch of vfs tree. CAI Qian -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
