KMSAN: uninit-value in btrfs_clean_tree

KMSAN: uninit-value in btrfs_clean_tree_block (2)
Status: upstream: reported on 2021/11/20 10:47
Reported-by: syzbot+fba8e2116a12609b6c59@syzkaller.appspotmail.com
First crash: 15d, last: 27m

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in btrfs_clean_tree_block				18531	117d	438d	0/22	auto-closed as invalid on 2021/11/04 13:33

Sample crash report:

=====================================================
BUG: KMSAN: uninit-value in btrfs_clean_tree_block+0x2c3/0x370 fs/btrfs/disk-io.c:1126
 btrfs_clean_tree_block+0x2c3/0x370 fs/btrfs/disk-io.c:1126
 btrfs_init_new_buffer fs/btrfs/extent-tree.c:4741 [inline]
 btrfs_alloc_tree_block+0x745/0x20c0 fs/btrfs/extent-tree.c:4818
 __btrfs_cow_block+0x823/0x2490 fs/btrfs/ctree.c:415
 btrfs_cow_block+0xa4a/0xc80 fs/btrfs/ctree.c:570
 commit_cowonly_roots+0x1c5/0x14c0 fs/btrfs/transaction.c:1241
 btrfs_commit_transaction+0x1d8a/0x4b10 fs/btrfs/transaction.c:2288
 btrfs_commit_super+0x1b7/0x1f0 fs/btrfs/disk-io.c:4303
 close_ctree+0x4e4/0xfbd fs/btrfs/disk-io.c:4370
 btrfs_put_super+0x53/0x70 fs/btrfs/super.c:340
 generic_shutdown_super+0x2bb/0x660 fs/super.c:465
 kill_anon_super+0x63/0xb0 fs/super.c:1057
 btrfs_kill_super+0x61/0x90 fs/btrfs/super.c:2348
 deactivate_locked_super+0x10d/0x1e0 fs/super.c:335
 deactivate_super+0x19e/0x1a0 fs/super.c:366
 cleanup_mnt+0x797/0x870 fs/namespace.c:1137
 __cleanup_mnt+0x3b/0x50 fs/namespace.c:1144
 task_work_run+0x1f0/0x2c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x3fc/0x490 kernel/entry/common.c:176
 exit_to_user_mode_prepare kernel/entry/common.c:208 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x80/0xc0 kernel/entry/common.c:302
 __do_fast_syscall_32+0xa5/0xf0 arch/x86/entry/common.c:183
 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+0x8b3/0xfb0 mm/page_alloc.c:5421
 alloc_pages+0xa39/0xde0 mm/mempolicy.c:2191
 __page_cache_alloc mm/filemap.c:1022 [inline]
 pagecache_get_page+0x1384/0x1ec0 mm/filemap.c:1940
 find_or_create_page include/linux/pagemap.h:420 [inline]
 alloc_extent_buffer+0x8c5/0x3420 fs/btrfs/extent_io.c:6124
 btrfs_find_create_tree_block+0xb2/0xd0 fs/btrfs/disk-io.c:1090
 btrfs_init_new_buffer fs/btrfs/extent-tree.c:4717 [inline]
 btrfs_alloc_tree_block+0x507/0x20c0 fs/btrfs/extent-tree.c:4818
 __btrfs_cow_block+0x823/0x2490 fs/btrfs/ctree.c:415
 btrfs_cow_block+0xa4a/0xc80 fs/btrfs/ctree.c:570
 commit_cowonly_roots+0x1c5/0x14c0 fs/btrfs/transaction.c:1241
 btrfs_commit_transaction+0x1d8a/0x4b10 fs/btrfs/transaction.c:2288
 btrfs_commit_super+0x1b7/0x1f0 fs/btrfs/disk-io.c:4303
 close_ctree+0x4e4/0xfbd fs/btrfs/disk-io.c:4370
 btrfs_put_super+0x53/0x70 fs/btrfs/super.c:340
 generic_shutdown_super+0x2bb/0x660 fs/super.c:465
 kill_anon_super+0x63/0xb0 fs/super.c:1057
 btrfs_kill_super+0x61/0x90 fs/btrfs/super.c:2348
 deactivate_locked_super+0x10d/0x1e0 fs/super.c:335
 deactivate_super+0x19e/0x1a0 fs/super.c:366
 cleanup_mnt+0x797/0x870 fs/namespace.c:1137
 __cleanup_mnt+0x3b/0x50 fs/namespace.c:1144
 task_work_run+0x1f0/0x2c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x3fc/0x490 kernel/entry/common.c:176
 exit_to_user_mode_prepare kernel/entry/common.c:208 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x80/0xc0 kernel/entry/common.c:302
 __do_fast_syscall_32+0xa5/0xf0 arch/x86/entry/common.c:183
 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
=====================================================

Crashes (892):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kmsan-gce-386	2021/12/01 15:13	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 15:04	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 13:57	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 12:44	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 11:39	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 10:13	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 09:12	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/12/01 08:40	https://github.com/google/kmsan.git master	a535b0caaa2f	5fa3eacc	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 17:44	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 17:18	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 16:09	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 15:00	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 14:29	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 13:23	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 12:14	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 11:22	https://github.com/google/kmsan.git master	a535b0caaa2f	80270552	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 07:48	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/30 00:42	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 22:46	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 22:40	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 21:38	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 20:37	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 20:14	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 18:57	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 17:53	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 17:37	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 16:35	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 15:24	https://github.com/google/kmsan.git master	a535b0caaa2f	d0830353	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 14:09	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 12:21	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 11:10	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 07:29	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 05:18	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/29 02:29	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 22:35	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 21:01	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 18:21	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 17:00	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 15:09	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 13:55	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 12:15	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/28 11:03	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/20 06:45	https://github.com/google/kmsan.git master	412af9cd936d	3a9d0024	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/16 10:38	https://github.com/google/kmsan.git master	386004877847	600426bd	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block
ci-upstream-kmsan-gce-386	2021/11/16 10:28	https://github.com/google/kmsan.git master	386004877847	600426bd	.config	log	report	info	KMSAN: uninit-value in btrfs_clean_tree_block