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AJvYcCUHtMc9zAPM+xksKJm5uGQQVpgCFh/7aHEizJgVURmoBDk8oo95YVpyMNDlxIWhjH3lg6fMWfNBR59MkAaEMA==@vger.kernel.org X-Gm-Message-State: AOJu0YwsWcWfr19SBRX/SfnNteYxJRJDcxCit3AIUXiYhXkdyi5Y/xAT O+nNIO5RDDZxaqkxErYfClG4vW3yg2eoH/Ohs15T7uCJA0CTLdjs4t2lYNyaOnhnXoCct7vZ8BL ddRtl9yFcAKH2rxD2JFWPQrVZk3QwLWKk4oFVhqjQVl2w1zArAlEs+uo= X-Google-Smtp-Source: AGHT+IEDdJroIBNPT80drRkeuVN/w+F8f240nebGk8Hd5ZyrQnwZcTdIC1pgng7jRcNQ2RP83LQ78irISg30pkvTMyCT/laljQ4b Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2192:b0:3a0:985b:ddb4 with SMTP id e9e14a558f8ab-3a3f404ff3amr86757085ab.2.1729493067862; Sun, 20 Oct 2024 23:44:27 -0700 (PDT) Date: Sun, 20 Oct 2024 23:44:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6715f84b.050a0220.10f4f4.003e.GAE@google.com> Subject: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in bch2_alloc_to_text 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" Hello, syzbot found the following issue on: HEAD commit: c964ced77262 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12d9745f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfbd94c114a3d407 dashboard link: https://syzkaller.appspot.com/bug?extid=7f45fa9805c40db3f108 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=12637887980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12a1e830580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c964ced7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e937ef58569a/vmlinux-c964ced7.xz kernel image: https://storage.googleapis.com/syzbot-assets/f1df9880ca4b/bzImage-c964ced7.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/00439b875347/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7f45fa9805c40db3f108@syzkaller.appspotmail.com bcachefs (loop0): fatal error - emergency read only bcachefs (loop0): insufficient writeable journal devices available: have 0, need 1 rw journal devs: loop0 ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/bcachefs/alloc_background.h:165:13 shift exponent 129 is too large for 32-bit type 'unsigned int' CPU: 0 UID: 0 PID: 5104 Comm: syz-executor159 Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 data_type_movable fs/bcachefs/alloc_background.h:165 [inline] alloc_lru_idx_fragmentation fs/bcachefs/alloc_background.h:171 [inline] bch2_alloc_to_text+0xc79/0xce0 fs/bcachefs/alloc_background.c:369 __bch2_bkey_fsck_err+0x1c8/0x280 fs/bcachefs/error.c:454 bch2_alloc_v4_validate+0x931/0xef0 fs/bcachefs/alloc_background.c:259 bch2_btree_node_read_done+0x3e7e/0x5e90 fs/bcachefs/btree_io.c:1223 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1327 bch2_btree_node_read+0x2433/0x2a10 __bch2_btree_root_read fs/bcachefs/btree_io.c:1753 [inline] bch2_btree_root_read+0x617/0x7a0 fs/bcachefs/btree_io.c:1775 read_btree_roots+0x296/0x840 fs/bcachefs/recovery.c:524 bch2_fs_recovery+0x2585/0x39c0 fs/bcachefs/recovery.c:854 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1036 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2174 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 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: 0033:0x7f7b61a11dea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffff7f9a888 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffff7f9a8a0 RCX: 00007f7b61a11dea RDX: 00000000200058c0 RSI: 0000000020000100 RDI: 00007ffff7f9a8a0 RBP: 0000000000000004 R08: 00007ffff7f9a8e0 R09: 00000000000058c6 R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000 R13: 00007ffff7f9a8e0 R14: 0000000000000003 R15: 0000000001000000 ---[ end trace ]--- --- 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@googlegroups.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