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Date: Tue, 28 May 2024 01:13:23 -0700 From: syzbot <syzbot+fa3fc4c486ec9c342fcc@...kaller.appspotmail.com> To: bfoster@...hat.com, kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] UBSAN: array-index-out-of-bounds in bch2_btree_path_traverse_cached_slowpath Hello, syzbot found the following issue on: HEAD commit: 2bfcfd584ff5 Merge tag 'pmdomain-v6.10-rc1' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1674fd44980000 kernel config: https://syzkaller.appspot.com/x/.config?x=733cc7a95171d8e7 dashboard link: https://syzkaller.appspot.com/bug?extid=fa3fc4c486ec9c342fcc compiler: gcc (Debian 12.2.0-14) 12.2.0, 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 (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2bfcfd58.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c7ed3bb80bed/vmlinux-2bfcfd58.xz kernel image: https://storage.googleapis.com/syzbot-assets/93acc5bfbaef/bzImage-2bfcfd58.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fa3fc4c486ec9c342fcc@...kaller.appspotmail.com bcachefs (loop2): journal_replay... done bcachefs (loop2): resume_logged_ops... done bcachefs (loop2): going read-write bcachefs (loop2): done starting filesystem ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/bcachefs/btree_key_cache.c:215:16 index 66 is out of range for type 'bkey_cached *[16]' CPU: 1 PID: 7694 Comm: syz-executor.2 Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:114 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0x110/0x150 lib/ubsan.c:429 bkey_cached_alloc fs/bcachefs/btree_key_cache.c:215 [inline] btree_key_cache_create fs/bcachefs/btree_key_cache.c:329 [inline] bch2_btree_path_traverse_cached_slowpath+0x4304/0x4d90 fs/bcachefs/btree_key_cache.c:484 bch2_btree_path_traverse_cached+0x9ec/0xdc0 fs/bcachefs/btree_key_cache.c:587 bch2_btree_path_traverse_one+0x16b4/0x2e40 fs/bcachefs/btree_iter.c:1158 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:229 [inline] bch2_btree_path_traverse fs/bcachefs/btree_iter.h:221 [inline] bch2_btree_iter_peek_slot+0x715/0x2450 fs/bcachefs/btree_iter.c:2603 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:552 [inline] bch2_bkey_get_iter fs/bcachefs/btree_iter.h:566 [inline] bch2_inode_peek_nowarn+0x1e3/0x390 fs/bcachefs/inode.c:340 bch2_inode_peek fs/bcachefs/inode.c:366 [inline] bch2_inode_find_by_inum_trans+0x125/0x2a0 fs/bcachefs/inode.c:939 bch2_vfs_inode_get+0x41f/0x550 fs/bcachefs/fs.c:277 bch2_mount+0xc81/0x1090 fs/bcachefs/fs.c:1999 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf72f3579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5ee5400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f5ee5460 RCX: 0000000020011a40 RDX: 0000000020000040 RSI: 0000000001200014 RDI: 00000000f5ee54a0 RBP: 00000000f5ee5460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---[ end trace ]--- ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- 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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