Hello, syzbot found the following issue on: HEAD commit: 968c2729e576 x86: kmsan: fix comment in kmsan_shadow.c git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=11d01ad6880000 kernel config: https://syzkaller.appspot.com/x/.config?x=131312b26465c190 dashboard link: https://syzkaller.appspot.com/bug?extid=9767be679ef5016b6082 compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c78ce21b953f/disk-968c2729.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/22868d826804/vmlinux-968c2729.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9767be679ef5016b6082@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in pagecache_write+0x655/0x720 fs/ext4/verity.c:91 pagecache_write+0x655/0x720 fs/ext4/verity.c:91 ext4_write_merkle_tree_block+0x84/0xa0 fs/ext4/verity.c:389 build_merkle_tree_level+0x972/0x1250 fs/verity/enable.c:121 build_merkle_tree fs/verity/enable.c:182 [inline] enable_verity+0xede/0x1920 fs/verity/enable.c:268 fsverity_ioctl_enable+0x895/0xab0 fs/verity/enable.c:392 __ext4_ioctl fs/ext4/ioctl.c:1572 [inline] ext4_ioctl+0x26dd/0x8c50 fs/ext4/ioctl.c:1606 ext4_compat_ioctl+0x702/0x800 fs/ext4/ioctl.c:1682 __do_compat_sys_ioctl fs/ioctl.c:968 [inline] __se_compat_sys_ioctl+0x781/0xfa0 fs/ioctl.c:910 __ia32_compat_sys_ioctl+0x8f/0xd0 fs/ioctl.c:910 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Local variable fsdata created at: pagecache_write+0x21c/0x720 fs/ext4/verity.c:85 ext4_write_merkle_tree_block+0x84/0xa0 fs/ext4/verity.c:389 CPU: 1 PID: 15121 Comm: syz-executor.3 Not tainted 6.0.0-rc5-syzkaller-48543-g968c2729e576 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
