syzbot


KMSAN: uninit-value in bch2_bset_fix_lookup_table

Status: upstream: reported on 2024/05/18 20:43
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+097987693500c9e31552@syzkaller.appspotmail.com
First crash: 34d, last: 7d14h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] KMSAN: uninit-value in bch2_bset_fix_lookup_table 0 (1) 2024/05/18 20:43

Sample crash report:
bcachefs (loop2): journal_replay... done
bcachefs (loop2): resume_logged_ops... done
bcachefs (loop2): going read-write
bcachefs (loop2): done starting filesystem
=====================================================
BUG: KMSAN: uninit-value in bch2_bset_fix_lookup_table+0x15e1/0x1e90 fs/bcachefs/bset.c:986
 bch2_bset_fix_lookup_table+0x15e1/0x1e90 fs/bcachefs/bset.c:986
 bch2_bset_insert+0x1617/0x19f0 fs/bcachefs/bset.c:1042
 bch2_btree_bset_insert_key+0xf56/0x2b70 fs/bcachefs/btree_trans_commit.c:194
 bch2_btree_insert_key_leaf+0x276/0x1050 fs/bcachefs/btree_trans_commit.c:277
 bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:744 [inline]
 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline]
 __bch2_trans_commit+0x98e6/0xab10 fs/bcachefs/btree_trans_commit.c:1093
 bch2_trans_commit fs/bcachefs/btree_update.h:168 [inline]
 __bch2_create+0xe93/0x15d0 fs/bcachefs/fs.c:327
 bch2_mknod fs/bcachefs/fs.c:451 [inline]
 bch2_create+0xdd/0x1e0 fs/bcachefs/fs.c:465
 vfs_create+0x3e7/0x5f0 fs/namei.c:3207
 do_mknodat+0x782/0xb90 fs/namei.c:4059
 __do_sys_mknodat fs/namei.c:4087 [inline]
 __se_sys_mknodat fs/namei.c:4084 [inline]
 __x64_sys_mknodat+0xe9/0x150 fs/namei.c:4084
 x64_sys_call+0x315e/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:260
 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:
 __kmalloc_large_node+0x231/0x370 mm/slub.c:3994
 __do_kmalloc_node mm/slub.c:4027 [inline]
 __kmalloc_node+0xb10/0x10c0 mm/slub.c:4046
 kmalloc_node include/linux/slab.h:648 [inline]
 kvmalloc_node+0xc0/0x2d0 mm/util.c:634
 kvmalloc include/linux/slab.h:766 [inline]
 btree_bounce_alloc fs/bcachefs/btree_io.c:118 [inline]
 bch2_btree_node_read_done+0x4e68/0x75e0 fs/bcachefs/btree_io.c:1185
 btree_node_read_work+0x8a5/0x1eb0 fs/bcachefs/btree_io.c:1324
 bch2_btree_node_read+0x3d42/0x4b50
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1748 [inline]
 bch2_btree_root_read+0xa6c/0x13d0 fs/bcachefs/btree_io.c:1772
 read_btree_roots+0x454/0xee0 fs/bcachefs/recovery.c:457
 bch2_fs_recovery+0x7b6a/0x93e0 fs/bcachefs/recovery.c:785
 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043
 bch2_fs_open+0x152a/0x15f0 fs/bcachefs/super.c:2105
 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1906
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 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: 0 PID: 6760 Comm: syz-executor.2 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/10 21:14 upstream 614da38e2f7a 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/06/10 11:05 upstream 614da38e2f7a 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/06/08 10:11 upstream 614da38e2f7a 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/06/07 02:40 upstream 614da38e2f7a 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/06/06 17:16 upstream 614da38e2f7a 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/05/30 02:27 upstream 614da38e2f7a 34889ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/05/20 00:09 upstream 614da38e2f7a c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
2024/05/14 20:35 upstream a5131c3fdf26 fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in bch2_bset_fix_lookup_table
* Struck through repros no longer work on HEAD.