syzbot


KMSAN: uninit-value in gfs2_quota_init

Status: upstream: reported on 2024/05/31 01:23
Subsystems: gfs2
[Documentation on labels]
Reported-by: syzbot+54a69997acb9eddf144e@syzkaller.appspotmail.com
First crash: 19d, last: 19d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [gfs2?] KMSAN: uninit-value in gfs2_quota_init 0 (1) 2024/05/31 01:23
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in _copy_to_iter (8) mm C 21180 372d 466d 22/27 fixed on 2023/06/08 14:41

Sample crash report:
syz-executor.3: attempt to access beyond end of device
loop3: rw=12288, sector=402653184, nr_sectors = 8 limit=32768
=====================================================
BUG: KMSAN: uninit-value in gfs2_metatype_check_i fs/gfs2/util.h:125 [inline]
BUG: KMSAN: uninit-value in gfs2_quota_init+0x1c1d/0x2150 fs/gfs2/quota.c:1443
 gfs2_metatype_check_i fs/gfs2/util.h:125 [inline]
 gfs2_quota_init+0x1c1d/0x2150 fs/gfs2/quota.c:1443
 gfs2_make_fs_rw+0x4cf/0x6a0 fs/gfs2/super.c:155
 gfs2_fill_super+0x410e/0x42b0 fs/gfs2/ops_fstype.c:1288
 get_tree_bdev+0x681/0x890 fs/super.c:1614
 gfs2_get_tree+0x5c/0x340 fs/gfs2/ops_fstype.c:1341
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264
 alloc_pages mm/mempolicy.c:2335 [inline]
 folio_alloc+0x1d0/0x230 mm/mempolicy.c:2342
 filemap_alloc_folio+0xa6/0x440 mm/filemap.c:984
 __filemap_get_folio+0xa10/0x14b0 mm/filemap.c:1926
 gfs2_getbuf+0x23f/0xcd0 fs/gfs2/meta_io.c:132
 gfs2_meta_ra+0x17f/0x7b0 fs/gfs2/meta_io.c:522
 gfs2_quota_init+0x784/0x2150 fs/gfs2/quota.c:1440
 gfs2_make_fs_rw+0x4cf/0x6a0 fs/gfs2/super.c:155
 gfs2_fill_super+0x410e/0x42b0 fs/gfs2/ops_fstype.c:1288
 get_tree_bdev+0x681/0x890 fs/super.c:1614
 gfs2_get_tree+0x5c/0x340 fs/gfs2/ops_fstype.c:1341
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 PID: 5867 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/27 01:15 upstream 614da38e2f7a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in gfs2_quota_init
* Struck through repros no longer work on HEAD.