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Message-ID: <67450f9a.050a0220.21d33d.0002.GAE@google.com> Date: Mon, 25 Nov 2024 16:00:26 -0800 From: syzbot <syzbot+f02ee424846cc4e04e04@...kaller.appspotmail.com> To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_trans_start_alloc_update Hello, syzbot found the following issue on: HEAD commit: 06afb0f36106 Merge tag 'trace-v6.13' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=124736e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ef9abe59471e0aee dashboard link: https://syzkaller.appspot.com/bug?extid=f02ee424846cc4e04e04 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=164736e8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12347b78580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/25d599464308/disk-06afb0f3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0846a79f5c2a/vmlinux-06afb0f3.xz kernel image: https://storage.googleapis.com/syzbot-assets/a69b15a49da1/bzImage-06afb0f3.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/da403496381c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f02ee424846cc4e04e04@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in bch2_alloc_to_v4_mut_inlined fs/bcachefs/alloc_background.c:447 [inline] BUG: KMSAN: uninit-value in bch2_trans_start_alloc_update_noupdate fs/bcachefs/alloc_background.c:472 [inline] BUG: KMSAN: uninit-value in bch2_trans_start_alloc_update+0x674/0x14b0 fs/bcachefs/alloc_background.c:487 bch2_alloc_to_v4_mut_inlined fs/bcachefs/alloc_background.c:447 [inline] bch2_trans_start_alloc_update_noupdate fs/bcachefs/alloc_background.c:472 [inline] bch2_trans_start_alloc_update+0x674/0x14b0 fs/bcachefs/alloc_background.c:487 bch2_trigger_pointer fs/bcachefs/buckets.c:588 [inline] __trigger_extent+0x2425/0x6810 fs/bcachefs/buckets.c:740 bch2_trigger_extent+0x90e/0x11a0 fs/bcachefs/buckets.c:869 bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline] bch2_key_trigger_old fs/bcachefs/bkey_methods.h:101 [inline] btree_update_nodes_written_trans fs/bcachefs/btree_update_interior.c:651 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:723 [inline] btree_interior_update_work+0x1661/0x4870 fs/bcachefs/btree_update_interior.c:861 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_reassemble fs/bcachefs/bkey.h:513 [inline] btree_key_cache_create fs/bcachefs/btree_key_cache.c:259 [inline] btree_key_cache_fill+0x13da/0x3d60 fs/bcachefs/btree_key_cache.c:309 bch2_btree_path_traverse_cached+0x988/0xe20 fs/bcachefs/btree_key_cache.c:361 bch2_btree_path_traverse_one+0x749/0x47b0 fs/bcachefs/btree_iter.c:1159 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:247 [inline] bch2_btree_iter_peek_slot+0x10b7/0x3950 fs/bcachefs/btree_iter.c:2629 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:575 [inline] bch2_bkey_get_iter fs/bcachefs/btree_iter.h:589 [inline] bch2_trans_start_alloc_update_noupdate fs/bcachefs/alloc_background.c:464 [inline] bch2_trans_start_alloc_update+0x3d8/0x14b0 fs/bcachefs/alloc_background.c:487 bch2_trigger_pointer fs/bcachefs/buckets.c:588 [inline] __trigger_extent+0x2425/0x6810 fs/bcachefs/buckets.c:740 bch2_trigger_extent+0x90e/0x11a0 fs/bcachefs/buckets.c:869 bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline] bch2_key_trigger_old fs/bcachefs/bkey_methods.h:101 [inline] btree_update_nodes_written_trans fs/bcachefs/btree_update_interior.c:651 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:723 [inline] btree_interior_update_work+0x1661/0x4870 fs/bcachefs/btree_update_interior.c:861 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:4219 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4236 __do_kmalloc_node mm/slub.c:4252 [inline] __kmalloc_node_noprof+0x9d6/0xf50 mm/slub.c:4270 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:658 btree_node_data_alloc fs/bcachefs/btree_cache.c:153 [inline] __bch2_btree_node_mem_alloc+0x2be/0xa80 fs/bcachefs/btree_cache.c:198 bch2_fs_btree_cache_init+0x4e4/0xb50 fs/bcachefs/btree_cache.c:653 bch2_fs_alloc fs/bcachefs/super.c:917 [inline] bch2_fs_open+0x4d3a/0x5b40 fs/bcachefs/super.c:2065 bch2_fs_get_tree+0x983/0x22d0 fs/bcachefs/fs.c:2157 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: 75 Comm: kworker/u8:5 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btree_update btree_interior_update_work ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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