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Message-ID: <67471375.050a0220.21d33d.0024.GAE@google.com> Date: Wed, 27 Nov 2024 04:41:25 -0800 From: syzbot <syzbot+8dd95f470e7cd0ff4b66@...kaller.appspotmail.com> To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_alloc_v4_validate (2) syzbot has found a reproducer for the following issue on: HEAD commit: 7eef7e306d3c Merge tag 'for-6.13/dm-changes' of git://git... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1346e1e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c5486b9d7cc64830 dashboard link: https://syzkaller.appspot.com/bug?extid=8dd95f470e7cd0ff4b66 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=1353fff7980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151643c0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2331c33a914b/disk-7eef7e30.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8e50ed828391/vmlinux-7eef7e30.xz kernel image: https://storage.googleapis.com/syzbot-assets/a942e199e781/bzImage-7eef7e30.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/495fbbf0d709/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8dd95f470e7cd0ff4b66@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in bch2_alloc_v4_validate+0x739/0x19a0 fs/bcachefs/alloc_background.c:249 bch2_alloc_v4_validate+0x739/0x19a0 fs/bcachefs/alloc_background.c:249 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+0xa5/0x2e0 fs/bcachefs/btree_io.c:2284 bch2_btree_node_rewrite+0x1442/0x1930 fs/bcachefs/btree_update_interior.c:2179 async_btree_node_rewrite_trans fs/bcachefs/btree_update_interior.c:2236 [inline] async_btree_node_rewrite_work+0x485/0x1710 fs/bcachefs/btree_update_interior.c:2249 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 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: bch2_alloc_v4_validate+0x27f/0x19a0 fs/bcachefs/alloc_background.c:247 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+0xa5/0x2e0 fs/bcachefs/btree_io.c:2284 bch2_btree_node_rewrite+0x1442/0x1930 fs/bcachefs/btree_update_interior.c:2179 async_btree_node_rewrite_trans fs/bcachefs/btree_update_interior.c:2236 [inline] async_btree_node_rewrite_work+0x485/0x1710 fs/bcachefs/btree_update_interior.c:2249 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 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+0x16af/0x19d0 fs/bcachefs/bkey_sort.c:187 __bch2_btree_node_write+0x3ae8/0x6830 fs/bcachefs/btree_io.c:2095 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2284 bch2_btree_node_rewrite+0x1442/0x1930 fs/bcachefs/btree_update_interior.c:2179 async_btree_node_rewrite_trans fs/bcachefs/btree_update_interior.c:2236 [inline] async_btree_node_rewrite_work+0x485/0x1710 fs/bcachefs/btree_update_interior.c:2249 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 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_repack+0xb74/0x1040 fs/bcachefs/bkey_sort.c:140 bch2_btree_sort_into+0x212/0x620 fs/bcachefs/btree_io.c:399 bch2_btree_node_alloc_replacement+0xa3d/0xb60 fs/bcachefs/btree_update_interior.c:469 bch2_btree_node_rewrite+0x2d4/0x1930 fs/bcachefs/btree_update_interior.c:2155 async_btree_node_rewrite_trans fs/bcachefs/btree_update_interior.c:2236 [inline] async_btree_node_rewrite_work+0x485/0x1710 fs/bcachefs/btree_update_interior.c:2249 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 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_prep_for_write+0x494/0x720 fs/bcachefs/btree_trans_commit.c:93 bch2_trans_lock_write+0x7ef/0xc00 fs/bcachefs/btree_trans_commit.c:129 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:896 [inline] __bch2_trans_commit+0x31c4/0xd190 fs/bcachefs/btree_trans_commit.c:1121 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline] bch2_journal_replay+0x2e3d/0x4d30 fs/bcachefs/recovery.c:317 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:191 [inline] bch2_run_recovery_passes+0xaf9/0xf80 fs/bcachefs/recovery_passes.c:244 bch2_fs_recovery+0x447b/0x5b00 fs/bcachefs/recovery.c:861 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1037 bch2_fs_get_tree+0x13ea/0x22d0 fs/bcachefs/fs.c:2170 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507 path_mount+0x742/0x1f10 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x722/0x810 fs/namespace.c:4034 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034 x64_sys_call+0x39bf/0x3c30 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: 11 Comm: kworker/u8:0 Not tainted 6.12.0-syzkaller-09567-g7eef7e306d3c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btree_node_rewrite async_btree_node_rewrite_work ===================================================== --- 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.
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