[syzbot] KMSAN: uninit-value in udf_evict_inode (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    8b936c96768e kmsan: core: remove the accidentally committe..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=12c9f1beb00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e00a8959fdd3f3e8
dashboard link: https://syzkaller.appspot.com/bug?extid=9ca499bb57a2b9e4c652
compiler:       clang version 14.0.0 (git@xxxxxxxxxx:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9ca499bb57a2b9e4c652@xxxxxxxxxxxxxxxxxxxxxxxxx

UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000)
=====================================================
BUG: KMSAN: uninit-value in udf_evict_inode+0x2b6/0x830 fs/udf/inode.c:148
 udf_evict_inode+0x2b6/0x830 fs/udf/inode.c:148
 evict+0x4f7/0xdc0 fs/inode.c:590
 iput_final fs/inode.c:1670 [inline]
 iput+0xc5d/0x1110 fs/inode.c:1696
 udf_new_inode+0x5d2/0x16e0 fs/udf/ialloc.c:89
 udf_tmpfile+0x7e/0x2d0 fs/udf/namei.c:631
 vfs_tmpfile+0x2d9/0x5b0 fs/namei.c:3474
 do_tmpfile+0x29f/0x6c0 fs/namei.c:3509
 path_openat+0x4116/0x5dd0 fs/namei.c:3550
 do_filp_open+0x306/0x760 fs/namei.c:3586
 do_sys_openat2+0x263/0x8f0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_compat_sys_openat fs/open.c:1288 [inline]
 __se_compat_sys_openat fs/open.c:1286 [inline]
 __ia32_compat_sys_openat+0x353/0x3c0 fs/open.c:1286
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 udf_new_inode+0xac1/0x16e0 fs/udf/ialloc.c:67
 udf_tmpfile+0x7e/0x2d0 fs/udf/namei.c:631
 vfs_tmpfile+0x2d9/0x5b0 fs/namei.c:3474
 do_tmpfile+0x29f/0x6c0 fs/namei.c:3509
 path_openat+0x4116/0x5dd0 fs/namei.c:3550
 do_filp_open+0x306/0x760 fs/namei.c:3586
 do_sys_openat2+0x263/0x8f0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_compat_sys_openat fs/open.c:1288 [inline]
 __se_compat_sys_openat fs/open.c:1286 [inline]
 __ia32_compat_sys_openat+0x353/0x3c0 fs/open.c:1286
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 udf_alloc_inode+0x28a/0x2c0 fs/udf/super.c:149
 alloc_inode fs/inode.c:235 [inline]
 new_inode_pseudo+0xa6/0x5a0 fs/inode.c:944
 new_inode+0x5a/0x3c0 fs/inode.c:973
 udf_new_inode+0x139/0x16e0 fs/udf/ialloc.c:60
 udf_tmpfile+0x7e/0x2d0 fs/udf/namei.c:631
 vfs_tmpfile+0x2d9/0x5b0 fs/namei.c:3474
 do_tmpfile+0x29f/0x6c0 fs/namei.c:3509
 path_openat+0x4116/0x5dd0 fs/namei.c:3550
 do_filp_open+0x306/0x760 fs/namei.c:3586
 do_sys_openat2+0x263/0x8f0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_compat_sys_openat fs/open.c:1288 [inline]
 __se_compat_sys_openat fs/open.c:1286 [inline]
 __ia32_compat_sys_openat+0x353/0x3c0 fs/open.c:1286
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
 __alloc_pages+0xbc7/0x10a0 mm/page_alloc.c:5409
 alloc_pages+0x8a5/0xb80
 alloc_slab_page mm/slub.c:1810 [inline]
 allocate_slab+0x287/0x1c20 mm/slub.c:1947
 new_slab mm/slub.c:2010 [inline]
 ___slab_alloc+0xbdf/0x1e90 mm/slub.c:3039
 __slab_alloc mm/slub.c:3126 [inline]
 slab_alloc_node mm/slub.c:3217 [inline]
 slab_alloc mm/slub.c:3259 [inline]
 kmem_cache_alloc+0xbb3/0x11c0 mm/slub.c:3264
 udf_alloc_inode+0x60/0x2c0 fs/udf/super.c:139
 alloc_inode fs/inode.c:235 [inline]
 new_inode_pseudo+0xa6/0x5a0 fs/inode.c:944
 new_inode+0x5a/0x3c0 fs/inode.c:973
 udf_new_inode+0x139/0x16e0 fs/udf/ialloc.c:60
 udf_tmpfile+0x7e/0x2d0 fs/udf/namei.c:631
 vfs_tmpfile+0x2d9/0x5b0 fs/namei.c:3474
 do_tmpfile+0x29f/0x6c0 fs/namei.c:3509
 path_openat+0x4116/0x5dd0 fs/namei.c:3550
 do_filp_open+0x306/0x760 fs/namei.c:3586
 do_sys_openat2+0x263/0x8f0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_compat_sys_openat fs/open.c:1288 [inline]
 __se_compat_sys_openat fs/open.c:1286 [inline]
 __ia32_compat_sys_openat+0x353/0x3c0 fs/open.c:1286
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

CPU: 1 PID: 9774 Comm: syz-executor.4 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


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