[syzbot] [bcachefs?] KMSAN: uninit-value in bch2_bkey_cmp_packed_inlined

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    d1f2d51b711a Merge tag 'clk-fixes-for-linus' of git://git...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11671f29980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=de85d75807a205cd
dashboard link: https://syzkaller.appspot.com/bug?extid=6f655a60d3244d0c6718
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17f3589f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=100b589f980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/df667fbbb2c1/disk-d1f2d51b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1574a134d7c4/vmlinux-d1f2d51b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a977c1daccb8/bzImage-d1f2d51b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/db88b8b6831b/mount_3.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f655a60d3244d0c6718@xxxxxxxxxxxxxxxxxxxxxxxxx

bucket 0:127 gen 0 has wrong data_type: got free, should be sb, fixing
bucket 0:127 gen 0 data type sb has wrong dirty_sectors: got 0, should be 256, fixing
 done
bcachefs (loop0): going read-write
bcachefs (loop0): journal_replay...
=====================================================
BUG: KMSAN: uninit-value in bch2_bkey_cmp_packed_inlined+0x8d0/0xd50 fs/bcachefs/bkey_cmp.h:115
 bch2_bkey_cmp_packed_inlined+0x8d0/0xd50 fs/bcachefs/bkey_cmp.h:115
 bch2_sort_keys_keep_unwritten_whiteouts+0xf94/0x19d0 fs/bcachefs/bkey_sort.c:184
 __bch2_btree_node_write+0x3ae7/0x6830 fs/bcachefs/btree_io.c:2096
 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2285
 btree_node_write_if_need fs/bcachefs/btree_io.h:151 [inline]
 __btree_node_flush+0x606/0x680 fs/bcachefs/btree_trans_commit.c:252
 bch2_btree_node_flush0+0x35/0x60 fs/bcachefs/btree_trans_commit.c:261
 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:565
 journal_flush_done+0x156/0x3f0 fs/bcachefs/journal_reclaim.c:821
 bch2_journal_flush_pins+0x1a1/0x3b0 fs/bcachefs/journal_reclaim.c:851
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 bch2_journal_replay+0x4923/0x4d20 fs/bcachefs/recovery.c:383
 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:183 [inline]
 bch2_run_recovery_passes+0x400/0xec0 fs/bcachefs/recovery_passes.c:230
 bch2_fs_recovery+0x42d2/0x5c60 fs/bcachefs/recovery.c:859
 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1036
 bch2_fs_get_tree+0x13e8/0x22d0 fs/bcachefs/fs.c:1946
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1800
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3472
 path_mount+0x742/0x1f10 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:3997
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3997
 x64_sys_call+0x255a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4117
 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4134
 __do_kmalloc_node mm/slub.c:4150 [inline]
 __kmalloc_node_noprof+0x9d6/0xf50 mm/slub.c:4168
 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:650
 btree_bounce_alloc fs/bcachefs/btree_io.c:124 [inline]
 bch2_btree_node_read_done+0x52a9/0x7790 fs/bcachefs/btree_io.c:1192
 btree_node_read_work+0x973/0x1960 fs/bcachefs/btree_io.c:1323
 bch2_btree_node_read+0x2e6b/0x36e0
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1749 [inline]
 bch2_btree_root_read+0xa81/0x13f0 fs/bcachefs/btree_io.c:1773
 read_btree_roots+0x51c/0x1250 fs/bcachefs/recovery.c:523
 bch2_fs_recovery+0x422c/0x5c60 fs/bcachefs/recovery.c:851
 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1036
 bch2_fs_get_tree+0x13e8/0x22d0 fs/bcachefs/fs.c:1946
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1800
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3472
 path_mount+0x742/0x1f10 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:3997
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3997
 x64_sys_call+0x255a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 5189 Comm: syz-executor350 Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================


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