syzbot has found a reproducer for the following issue on: HEAD commit: feffde684ac2 Merge tag 'for-6.13-rc1-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1625ade8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=96ee18b6611821ab dashboard link: https://syzkaller.appspot.com/bug?extid=09c915024af5057b77da 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=10a390f8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1125ade8580000
Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b31883c9ce49/disk-feffde68.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cd0fe66ddb61/vmlinux-feffde68.xz kernel image: https://storage.googleapis.com/syzbot-assets/88e3455fb342/bzImage-feffde68.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/01cd3582aecd/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] ===================================================== BUG: KMSAN: uninit-value in bch2_backpointer_validate+0x63a/0x8f0 fs/bcachefs/backpointers.c:57 bch2_backpointer_validate+0x63a/0x8f0 fs/bcachefs/backpointers.c:57 bch2_bkey_val_validate+0x2b5/0x440 fs/bcachefs/bkey_methods.c:143 bset_key_validate fs/bcachefs/btree_io.c:841 [inline] validate_bset_keys+0x1531/0x2080 fs/bcachefs/btree_io.c:910 validate_bset_for_write+0x142/0x290 fs/bcachefs/btree_io.c:1942 __bch2_btree_node_write+0x53df/0x6830 fs/bcachefs/btree_io.c:2152 bch2_btree_node_write+0x256/0x2e0 fs/bcachefs/btree_io.c:2296 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_flush1+0x38/0x60 fs/bcachefs/btree_trans_commit.c:266 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:565 __bch2_journal_reclaim+0xda8/0x1670 fs/bcachefs/journal_reclaim.c:698 bch2_journal_reclaim_thread+0x18e/0x760 fs/bcachefs/journal_reclaim.c:740 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was stored to memory at: memcpy_u64s_small fs/bcachefs/util.h:393 [inline] bkey_p_copy fs/bcachefs/bkey.h:47 [inline] bch2_sort_keys_keep_unwritten_whiteouts+0x12d5/0x19d0 fs/bcachefs/bkey_sort.c:187 __bch2_btree_node_write+0x3ae8/0x6830 fs/bcachefs/btree_io.c:2095 bch2_btree_node_write+0x256/0x2e0 fs/bcachefs/btree_io.c:2296 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_flush1+0x38/0x60 fs/bcachefs/btree_trans_commit.c:266 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:565 __bch2_journal_reclaim+0xda8/0x1670 fs/bcachefs/journal_reclaim.c:698 bch2_journal_reclaim_thread+0x18e/0x760 fs/bcachefs/journal_reclaim.c:740 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4238 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4255 __do_kmalloc_node mm/slub.c:4271 [inline] __kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4289 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:650 btree_bounce_alloc fs/bcachefs/btree_io.c:124 [inline] btree_node_sort+0x78a/0x1d30 fs/bcachefs/btree_io.c:323 bch2_btree_post_write_cleanup+0x1b0/0xf20 fs/bcachefs/btree_io.c:2248 bch2_btree_node_write+0x21c/0x2e0 fs/bcachefs/btree_io.c:2289 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 __bch2_journal_reclaim+0xda8/0x1670 fs/bcachefs/journal_reclaim.c:698 bch2_journal_reclaim_thread+0x18e/0x760 fs/bcachefs/journal_reclaim.c:740 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 CPU: 0 UID: 0 PID: 5790 Comm: bch-reclaim/loo Not tainted 6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
