On Sat, Jan 02, 2021 at 12:02:29AM +0200, Konstantin Belousov wrote: > On Fri, Jan 01, 2021 at 06:44:00PM +0000, Alexey Dokuchaev wrote: > > On Tue, Sep 15, 2020 at 10:19:16PM +0000, Konstantin Belousov wrote: > > > New Revision: 365787 > > > URL: https://svnweb.freebsd.org/changeset/base/365787 > > > > > > Log: > > > Add tmpfs page cache read support. > > > > > > Or it could be explained as lockless (for vnode lock) reads. Reads > > > are performed from the node tn_obj object. Tmpfs regular vnode object > > > lifecycle is significantly different from the normal OBJT_VNODE: it is > > > alive as far as ref_count > 0. > > > > This causes panics for me when building ports in the tmpfs-backed tinderbox. > > Easily reproducible: > > > > 1) ./tc tinderbuild ... -b "$@" > > 2) tail -f .../tmp/make.log4 # on the adjacent console > > 3) wait until the build job finishes > > 4) ^C in the "tail" window -> crash > What exactly 'crash' is ? Provide literal transcription of the kernel > messages and not your interpretation of them. > > > ... > > __mtx_lock_sleep() > > tmpfs_free_node() > What is the source line for tmpfs_free_node() frame ? > > > tmpfs_fo_close() > > _fdrop() > > closef() > > fdescfree_fds() > > fdescfree() > > exit1() > > sigexit() > > postsig() > > ast() > > doreit_ast()
Forgot to mention this. I tried a somewhat naive method to reproduce it: # mount -t tmpfs none /mnt # echo 123 >/mnt/1 # tail -f /mnt/1 while in other session, # umount -f /mnt but this only resulted in report of EIO from tail, and SIGINT killed tail without producing the panic/page fault/whatever you see. _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
