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AJvYcCW2wP6IFmdnL+Hb+tZFQvn6DINX4U0xeP0CbXMxnjASSVQknsOaX/Tg1kDKy1pEp/XevyVxKZ/FzSMmCuXUyg==@vger.kernel.org X-Gm-Message-State: AOJu0YxY/zWYmXWZj8cFCveFK/l0B2Y+2/O0sJgv27MKX8BO4GljrOVE NE2LsIVDrKNOGD4pFQ/Tc9PYoW8cEreHQ5xd3PKqd//et0FECwMrst8asFgwWj6NMA5pmY9H8Ez rwbgjLKNPkAjNKjQ+ic4U/Ny+j8dSlsadGX7oxgrcKCZBwfm6ViP/LPQ= X-Google-Smtp-Source: AGHT+IHDUXzlrh88BcYJ6S0wAt4s1ey/GNNSpQhCKLz5NQ+Il8XQ4QcY5JzgAiTmwEfeBqPxj8syuskMmOjmbotlsDjWTkpyXoBQ Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1f03:b0:3a7:e732:4713 with SMTP id e9e14a558f8ab-3bdc428219emr60389395ab.15.1734602002872; Thu, 19 Dec 2024 01:53:22 -0800 (PST) Date: Thu, 19 Dec 2024 01:53:22 -0800 In-Reply-To: <6744873b.050a0220.1286eb.0000.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6763ed12.050a0220.3157ee.0014.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KASAN: global-out-of-bounds Read in rcu_pending_exit From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: eabcdba3ad40 Merge tag 'for-6.13-rc3-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=170e77e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1234f097ee657d8b dashboard link: https://syzkaller.appspot.com/bug?extid=e733ab672a1b6724c27f 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=12834cf8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7a4dff87674a/disk-eabcdba3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/266bc2b7ced3/vmlinux-eabcdba3.xz kernel image: https://storage.googleapis.com/syzbot-assets/ee4bcd9be832/bzImage-eabcdba3.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/7bfbea1d3e96/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e733ab672a1b6724c27f@syzkaller.appspotmail.com ------------[ cut here ]------------ ================================================================== BUG: KASAN: global-out-of-bounds in string_nocheck lib/vsprintf.c:646 [inline] BUG: KASAN: global-out-of-bounds in string+0x218/0x2b0 lib/vsprintf.c:728 Read of size 1 at addr ffffffff8c53984a by task syz.0.174/7554 CPU: 1 UID: 0 PID: 7554 Comm: syz.0.174 Not tainted 6.13.0-rc3-syzkaller-00073-geabcdba3ad40 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 string_nocheck lib/vsprintf.c:646 [inline] string+0x218/0x2b0 lib/vsprintf.c:728 vsnprintf+0x1101/0x1da0 lib/vsprintf.c:2848 vprintk_store+0x485/0x1240 kernel/printk/printk.c:2279 vprintk_emit+0x271/0xa10 kernel/printk/printk.c:2408 __warn_printk+0x263/0x360 kernel/panic.c:797 look_up_lock_class+0xdb/0x170 kernel/locking/lockdep.c:936 register_lock_class+0x102/0x980 kernel/locking/lockdep.c:1290 __lock_acquire+0xf3/0x2100 kernel/locking/lockdep.c:5101 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] rcu_pending_has_pending_or_armed fs/bcachefs/rcu_pending.c:576 [inline] rcu_pending_exit+0x13f/0x7a0 fs/bcachefs/rcu_pending.c:594 bch2_fs_btree_key_cache_exit+0x97f/0xab0 fs/bcachefs/btree_key_cache.c:741 __bch2_fs_free fs/bcachefs/super.c:556 [inline] bch2_fs_release+0x206/0x7d0 fs/bcachefs/super.c:611 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 bch2_fs_alloc fs/bcachefs/super.c:960 [inline] bch2_fs_open+0x1ebe/0x2f80 fs/bcachefs/super.c:2065 bch2_fs_get_tree+0x738/0x1710 fs/bcachefs/fs.c:2157 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb98f7874ca Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb99051be68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb99051bef0 RCX: 00007fb98f7874ca RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 00007fb99051beb0 RBP: 00000000200000c0 R08: 00007fb99051bef0 R09: 0000000000800000 R10: 0000000000800000 R11: 0000000000000246 R12: 0000000020000000 R13: 00007fb99051beb0 R14: 0000000000005938 R15: 0000000020005b00 The buggy address belongs to the variable: .str+0xa/0x20 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc539 flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002000 ffffea0000314e48 ffffea0000314e48 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffffffff8c539700: 02 f9 f9 f9 00 00 06 f9 f9 f9 f9 f9 00 00 03 f9 ffffffff8c539780: f9 f9 f9 f9 00 00 00 00 f9 f9 f9 f9 00 00 00 00 >ffffffff8c539800: 00 00 00 00 00 00 00 00 00 01 f9 f9 00 00 00 04 ^ ffffffff8c539880: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8c539900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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.