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AJvYcCV6M8z92GKiTzH+08jQuU8fGs+NN34AE1NOvGTY0Xf5kkO5QEL2TT7Pafm81yTVmmvmWCTdZ61DO6Q82OF+Ffh2s+XF1sH5ORHSIIdD X-Gm-Message-State: AOJu0YwyJLdrNB4ubJdot2LyH2YBIW3d1pz0l49d39mmDDPjTZLRP0Yh tSCPmDxcrPa3b91fiZklVHANArSaqb8addcPHFW2Qn04vG2SeaZMb73AkxVLUgjWI1hRpIjHRX4 36tWO34K5tVpP1z8jZP+/U8isqBKfQKF8KvzkutfZL4CIEeb9/zRAMFM= X-Google-Smtp-Source: AGHT+IGAjDdsV8ez56rlHz1o0lz0WD4jrCNjiClk7aEbNl1XYJdX7MGQXv32iG91ji5IRRyNi4AWTvGP5jC0RIdZTAMbNY0i7Fwa Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:484:b0:7de:e182:ddf1 with SMTP id ca18e2360f4ac-7e1b5010346mr83760039f.0.1715932948678; Fri, 17 May 2024 01:02:28 -0700 (PDT) Date: Fri, 17 May 2024 01:02:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000dd5d730618a1c598@google.com> Subject: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in bch2_btree_lost_data From: syzbot To: bfoster@redhat.com, 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: 8c06da67d0bd Merge tag 'livepatching-for-6.10' of git://gi.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=135f87d4980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cc69cd6a2dcb5aa dashboard link: https://syzkaller.appspot.com/bug?extid=29f65db1a5fe427b5c56 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=12d09ce0980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10ea775c980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/331202aeac12/disk-8c06da67.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4db56871f364/vmlinux-8c06da67.xz kernel image: https://storage.googleapis.com/syzbot-assets/2ab7bc870390/bzImage-8c06da67.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/b709a5f7f34f/mount_0.gz The issue was bisected to: commit 55936afe11077a84d9e1c5068169af328bbf2811 Author: Kent Overstreet Date: Sat Mar 16 03:03:42 2024 +0000 bcachefs: Flag btrees with missing data bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=145dc1d0980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=165dc1d0980000 console output: https://syzkaller.appspot.com/x/log.txt?x=125dc1d0980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+29f65db1a5fe427b5c56@syzkaller.appspotmail.com Fixes: 55936afe1107 ("bcachefs: Flag btrees with missing data") bcachefs (loop0): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,nojournal_transaction_names bcachefs (loop0): recovering from clean shutdown, journal seq 10 bcachefs (loop0): error validating btree node on loop0 at btree (unknown) level 3/3 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 27c2ec7b8e70cb08 written 16 min_key POS_MIN durability: 1 ptr: 0:31:0 gen 0 node offset 0/16 bset u64s 0: incorrect btree id bcachefs (loop0): inconsistency detected - emergency read only at journal seq 10 ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/bcachefs/recovery.c:38:10 shift exponent 255 is too large for 64-bit type 'unsigned long long' CPU: 1 PID: 5082 Comm: syz-executor184 Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 bch2_btree_lost_data+0x143/0x150 fs/bcachefs/recovery.c:38 bch2_btree_node_read_done+0x50f9/0x5a40 fs/bcachefs/btree_io.c:1272 btree_node_read_work+0x665/0x1300 fs/bcachefs/btree_io.c:1324 bch2_btree_node_read+0x2b64/0x32c0 __bch2_btree_root_read fs/bcachefs/btree_io.c:1748 [inline] bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1772 read_btree_roots+0x22d/0x7b0 fs/bcachefs/recovery.c:457 bch2_fs_recovery+0x4334/0x63b0 fs/bcachefs/recovery.c:785 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1043 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2105 bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1906 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1779 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa695417daa 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:00007ffc4c8ca6b8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc4c8ca6d0 RCX: 00007fa695417daa RDX: 0000000020011a00 RSI: 0000000020000080 RDI: 00007ffc4c8ca6d0 RBP: 0000000000000004 R08: 00007ffc4c8ca710 R09: 00000000000119fd R10: 0000000001200014 R11: 0000000000000282 R12: 0000000001200014 R13: 00007ffc4c8ca710 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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