Messages in this thread Patch in this message | | | From | Hillf Danton <> | Subject | Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek | Date | Sat, 6 Apr 2024 07:02:43 +0800 |
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On Wed, 03 Apr 2024 11:23:26 -0700 > syzbot found the following issue on: > > HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel.. > git tree: upstream > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c38139180000
Test Al's idea.
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e
--- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -639,6 +639,8 @@ static int kernfs_fop_open(struct inode */ if (has_mmap) mutex_init(&of->mutex); + else if (file->f_mode & FMODE_WRITE) + mutex_init(&of->mutex); else mutex_init(&of->mutex); --
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