[syzbot] [bcachefs?] KMSAN: uninit-value in bch2_inode_v3_invalid

* [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_inode_v3_invalid
@ 2024-05-05 18:26 syzbot
  2024-05-20  2:22 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2024-05-05 18:26 UTC (permalink / raw)
  To: bfoster, kent.overstreet, linux-bcachefs, linux-fsdevel,
	linux-kernel, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    7367539ad4b0 Merge tag 'cxl-fixes-6.9-rc7' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13ad5e60980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bbf567496022057b
dashboard link: https://syzkaller.appspot.com/bug?extid=d3803303d5b280e059d8
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/44fb709c4e9c/disk-7367539a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d25971073eca/vmlinux-7367539a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a327aa91b63e/bzImage-7367539a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d3803303d5b280e059d8@syzkaller.appspotmail.com

bcachefs (loop2): going read-only
bcachefs (loop2): finished waiting for writes to stop
bcachefs (loop2): flushing journal and stopping allocators, journal seq 9
=====================================================
BUG: KMSAN: uninit-value in bch2_inode_v3_invalid+0x390/0x520 fs/bcachefs/inode.c:516
 bch2_inode_v3_invalid+0x390/0x520 fs/bcachefs/inode.c:516
 bch2_bkey_val_invalid+0x24f/0x380 fs/bcachefs/bkey_methods.c:140
 bset_key_invalid fs/bcachefs/btree_io.c:831 [inline]
 validate_bset_keys+0x12d8/0x25d0 fs/bcachefs/btree_io.c:904
 validate_bset_for_write+0x1dd/0x340 fs/bcachefs/btree_io.c:1945
 __bch2_btree_node_write+0x5383/0x67c0 fs/bcachefs/btree_io.c:2155
 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2288
 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
 __btree_node_flush+0x4d0/0x640 fs/bcachefs/btree_trans_commit.c:229
 bch2_btree_node_flush0+0x35/0x60 fs/bcachefs/btree_trans_commit.c:238
 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:553
 journal_flush_done+0x156/0x3f0 fs/bcachefs/journal_reclaim.c:809
 bch2_journal_flush_pins+0xdb/0x3b0 fs/bcachefs/journal_reclaim.c:839
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 __bch2_fs_read_only+0x1b9/0x750 fs/bcachefs/super.c:277
 bch2_fs_read_only+0xcb4/0x1540 fs/bcachefs/super.c:357
 __bch2_fs_stop+0x112/0x6f0 fs/bcachefs/super.c:622
 bch2_put_super+0x3c/0x50 fs/bcachefs/fs.c:1788
 generic_shutdown_super+0x194/0x4c0 fs/super.c:641
 bch2_kill_sb+0x3d/0x70 fs/bcachefs/fs.c:2012
 deactivate_locked_super+0xe0/0x3f0 fs/super.c:472
 deactivate_super+0x14f/0x160 fs/super.c:505
 cleanup_mnt+0x6c6/0x730 fs/namespace.c:1267
 __cleanup_mnt+0x22/0x30 fs/namespace.c:1274
 task_work_run+0x268/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x160 kernel/entry/common.c:218
 do_syscall_64+0xdc/0x1e0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 memcpy_u64s_small fs/bcachefs/util.h:511 [inline]
 bkey_p_copy fs/bcachefs/bkey.h:46 [inline]
 bch2_sort_keys+0x1fdf/0x2cb0 fs/bcachefs/bkey_sort.c:194
 __bch2_btree_node_write+0x3acd/0x67c0 fs/bcachefs/btree_io.c:2100
 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2288
 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
 __btree_node_flush+0x4d0/0x640 fs/bcachefs/btree_trans_commit.c:229
 bch2_btree_node_flush0+0x35/0x60 fs/bcachefs/btree_trans_commit.c:238
 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:553
 journal_flush_done+0x156/0x3f0 fs/bcachefs/journal_reclaim.c:809
 bch2_journal_flush_pins+0xdb/0x3b0 fs/bcachefs/journal_reclaim.c:839
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 __bch2_fs_read_only+0x1b9/0x750 fs/bcachefs/super.c:277
 bch2_fs_read_only+0xcb4/0x1540 fs/bcachefs/super.c:357
 __bch2_fs_stop+0x112/0x6f0 fs/bcachefs/super.c:622
 bch2_put_super+0x3c/0x50 fs/bcachefs/fs.c:1788
 generic_shutdown_super+0x194/0x4c0 fs/super.c:641
 bch2_kill_sb+0x3d/0x70 fs/bcachefs/fs.c:2012
 deactivate_locked_super+0xe0/0x3f0 fs/super.c:472
 deactivate_super+0x14f/0x160 fs/super.c:505
 cleanup_mnt+0x6c6/0x730 fs/namespace.c:1267
 __cleanup_mnt+0x22/0x30 fs/namespace.c:1274
 task_work_run+0x268/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x160 kernel/entry/common.c:218
 do_syscall_64+0xdc/0x1e0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __kmalloc_large_node+0x231/0x370 mm/slub.c:3921
 __do_kmalloc_node mm/slub.c:3954 [inline]
 __kmalloc_node+0xb07/0x1060 mm/slub.c:3973
 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+0x7adb/0x9310 fs/bcachefs/recovery.c:785
 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043
 bch2_fs_open+0x135f/0x1670 fs/bcachefs/super.c:2102
 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1903
 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: 1 PID: 26381 Comm: syz-executor.2 Tainted: G        W          6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================

---
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