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Message-ID: <000000000000528f32061fb69112@google.com> Date: Thu, 15 Aug 2024 03:47:22 -0700 From: syzbot <syzbot+adfd64e93c46b99c957e@...kaller.appspotmail.com> To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot] [ocfs2?] general protection fault in ocfs2_buffer_cached Hello, syzbot found the following issue on: HEAD commit: d07b43284ab3 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=126c2aa3980000 kernel config: https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b dashboard link: https://syzkaller.appspot.com/bug?extid=adfd64e93c46b99c957e 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=1206cdd3980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13cfea91980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-d07b4328.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/91ceec6e19d3/vmlinux-d07b4328.xz kernel image: https://storage.googleapis.com/syzbot-assets/be11646b0c05/bzImage-d07b4328.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/90c0e9dcfbf9/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+adfd64e93c46b99c957e@...kaller.appspotmail.com loop0: detected capacity change from 0 to 32768 (syz-executor178,5091,0):ocfs2_read_blocks:240 ERROR: status = -12 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5091 Comm: syz-executor178 Not tainted 6.11.0-rc3-syzkaller-00060-gd07b43284ab3 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ocfs2_buffer_cached+0xcb/0x840 fs/ocfs2/uptodate.c:237 Code: eb b2 65 fe 4c 89 7c 24 20 4c 8b 5d 00 48 89 5c 24 08 48 89 df 41 ff d3 66 90 48 89 44 24 18 49 83 c5 18 4d 89 ec 49 c1 ec 03 <43> 80 3c 34 00 74 08 4c 89 ef e8 b6 b2 65 fe 49 8b 55 00 48 8b 44 RSP: 0018:ffffc9000b01e620 EFLAGS: 00010206 RAX: 0000000000000012 RBX: ffff88805f1faa70 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88805f1faa70 RBP: ffffffff8c48fcc0 R08: 0000000000000003 R09: fffff52001603cb4 R10: dffffc0000000000 R11: ffffffff8385d210 R12: 0000000000000003 R13: 0000000000000018 R14: dffffc0000000000 R15: 1ffff1100be3f54e FS: 00005555632e5380(0000) GS:ffff888020800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc970f4c08 CR3: 0000000036024000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ocfs2_set_buffer_uptodate+0xa1/0x1350 fs/ocfs2/uptodate.c:474 ocfs2_read_blocks+0x103e/0x1620 fs/ocfs2/buffer_head_io.c:392 ocfs2_read_virt_blocks+0x4c8/0xa50 fs/ocfs2/extent_map.c:1010 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x43b/0x2780 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xff/0x360 fs/ocfs2/dir.c:1980 ocfs2_lookup_ino_from_name+0xb1/0x1e0 fs/ocfs2/dir.c:2002 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x305/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x32c/0x730 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2250 [inline] ocfs2_fill_super+0x3068/0x5880 fs/ocfs2/super.c:994 mount_bdev+0x20a/0x2d0 fs/super.c:1679 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 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: 0033:0x7f4945e4ddea 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:00007ffdf618e318 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffdf618e330 RCX: 00007f4945e4ddea RDX: 0000000020004480 RSI: 00000000200044c0 RDI: 00007ffdf618e330 RBP: 0000000000000004 R08: 00007ffdf618e370 R09: 000000000000446f R10: 0000000002800400 R11: 0000000000000282 R12: 0000000002800400 R13: 00007ffdf618e370 R14: 0000000000000003 R15: 0000000001000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_buffer_cached+0xcb/0x840 fs/ocfs2/uptodate.c:237 Code: eb b2 65 fe 4c 89 7c 24 20 4c 8b 5d 00 48 89 5c 24 08 48 89 df 41 ff d3 66 90 48 89 44 24 18 49 83 c5 18 4d 89 ec 49 c1 ec 03 <43> 80 3c 34 00 74 08 4c 89 ef e8 b6 b2 65 fe 49 8b 55 00 48 8b 44 RSP: 0018:ffffc9000b01e620 EFLAGS: 00010206 RAX: 0000000000000012 RBX: ffff88805f1faa70 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88805f1faa70 RBP: ffffffff8c48fcc0 R08: 0000000000000003 R09: fffff52001603cb4 R10: dffffc0000000000 R11: ffffffff8385d210 R12: 0000000000000003 R13: 0000000000000018 R14: dffffc0000000000 R15: 1ffff1100be3f54e FS: 00005555632e5380(0000) GS:ffff888020800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc970f4c08 CR3: 0000000036024000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: eb b2 jmp 0xffffffb4 2: 65 fe 4c 89 7c decb %gs:0x7c(%rcx,%rcx,4) 7: 24 20 and $0x20,%al 9: 4c 8b 5d 00 mov 0x0(%rbp),%r11 d: 48 89 5c 24 08 mov %rbx,0x8(%rsp) 12: 48 89 df mov %rbx,%rdi 15: 41 ff d3 call *%r11 18: 66 90 xchg %ax,%ax 1a: 48 89 44 24 18 mov %rax,0x18(%rsp) 1f: 49 83 c5 18 add $0x18,%r13 23: 4d 89 ec mov %r13,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 43 80 3c 34 00 cmpb $0x0,(%r12,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 b6 b2 65 fe call 0xfe65b2ef 39: 49 8b 55 00 mov 0x0(%r13),%rdx 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 44 rex.R --- 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 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
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