Messages in this thread | | | Date | Sun, 7 Apr 2024 01:48:16 +0100 | From | Al Viro <> | Subject | Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek |
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On Sat, Apr 06, 2024 at 04:23:51PM +0800, Hillf Danton wrote: > On Sat, 6 Apr 2024 08:11:30 +0100 Al Viro <viro@ftp.linux.org.uk> > > On Sat, Apr 06, 2024 at 12:05:04AM -0700, syzbot wrote: > > > commit: 3398bf34 kernfs: annotate different lockdep class for .. > > > git tree: https://github.com/amir73il/linux/ vfs-fixes > > > kernel config: https://syzkaller.appspot.com/x/.config?x=c5cda112a8438056 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=9a5b0ced8b1bfb238b56 > > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 c > > > > > Note: no patches were applied. > > > > How about the same test on 6c6e47d69d821047097909288b6d7f1aafb3b9b1? > > > JFYI it works [1] > > [1] https://lore.kernel.org/lkml/000000000000a386f2061562ba6a@google.com/
It works on top of v6.8-8951-gfe46a7dd189e; boot failures on top of v6.9-rc2-387-g6c6e47d69d82 and on top of v6.9-rc1. See https://lore.kernel.org/lkml/00000000000039026a06155b3a12@google.com/ and https://lore.kernel.org/lkml/000000000000107743061568319c@google.com/ resp. Both hit refcount_t underflow in virtio_scsi probing, with very similar call chains (if not outright identical ones - hadn't checked in details).
I don't believe that this patch introduces a boot failure, let alone this one - all of that is likely to be shared with the corresponding points on mainline.
Might be interesting to try and figure out what that is, but that's a separate bug.
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