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Message-ID: <675c8759.050a0220.2875e5.004a.GAE@google.com> Date: Fri, 13 Dec 2024 11:13:29 -0800 From: syzbot <syzbot+ac254bd3bcde20072a0a@...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 __build_ro_aux_tree Hello, syzbot found the following issue on: HEAD commit: fac04efc5c79 Linux 6.13-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15eeab30580000 kernel config: https://syzkaller.appspot.com/x/.config?x=95d0bb0535bcaca0 dashboard link: https://syzkaller.appspot.com/bug?extid=ac254bd3bcde20072a0a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9d6e1c34e8de/disk-fac04efc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3e1de71b47f9/vmlinux-fac04efc.xz kernel image: https://storage.googleapis.com/syzbot-assets/915cb3b3a8e7/bzImage-fac04efc.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ac254bd3bcde20072a0a@...kaller.appspotmail.com bcachefs (loop3): journal_replay... ===================================================== BUG: KMSAN: uninit-value in __build_ro_aux_tree+0x61f/0x21a0 fs/bcachefs/bset.c:715 __build_ro_aux_tree+0x61f/0x21a0 fs/bcachefs/bset.c:715 bch2_bset_build_aux_tree+0x6e6/0x850 fs/bcachefs/bset.c:779 bch2_btree_build_aux_trees fs/bcachefs/btree_io.c:448 [inline] bch2_btree_init_next+0xdda/0x11e0 fs/bcachefs/btree_io.c:508 bch2_btree_node_prep_for_write+0x6c8/0x720 fs/bcachefs/btree_trans_commit.c:101 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] btree_key_cache_flush_pos fs/bcachefs/btree_key_cache.c:432 [inline] bch2_btree_key_cache_journal_flush+0x1076/0x1900 fs/bcachefs/btree_key_cache.c:512 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:565 journal_flush_done+0xe1/0x3f0 fs/bcachefs/journal_reclaim.c:819 bch2_journal_flush_pins+0xdb/0x3b0 fs/bcachefs/journal_reclaim.c:852 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline] bch2_journal_replay+0x4937/0x4d30 fs/bcachefs/recovery.c:383 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 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:4034 ia32_sys_call+0x260e/0x4180 arch/x86/include/generated/asm/syscalls_32.h:22 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449 entry_SYSENTER_compat_after_hwframe+0x84/0x8e 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_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 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:4034 ia32_sys_call+0x260e/0x4180 arch/x86/include/generated/asm/syscalls_32.h:22 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449 entry_SYSENTER_compat_after_hwframe+0x84/0x8e CPU: 1 UID: 0 PID: 6069 Comm: syz.3.35 Not tainted 6.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- 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 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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