Hello, syzbot found the following issue on: HEAD commit: d7b3af5a77e8 Add linux-next specific files for 20230728 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=13018b26a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=62dd327c382e3fe dashboard link: https://syzkaller.appspot.com/bug?extid=69c477e882e44ce41ad9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17b490c5a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=139a9c7ea80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5efa5e68267f/disk-d7b3af5a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b1f5d3e10263/vmlinux-d7b3af5a.xz kernel image: https://storage.googleapis.com/syzbot-assets/57cab469d186/bzImage-d7b3af5a.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2cf2189f623b/mount_0.gz The issue was bisected to: commit 1dbd9ceb390c4c61d28cf2c9251dd2015946ce51 Author: Jan Kara <jack@xxxxxxx> Date: Mon Jul 24 17:51:45 2023 +0000 fs: open block device after superblock creation bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1613d586a80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1513d586a80000 console output: https://syzkaller.appspot.com/x/log.txt?x=1113d586a80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+69c477e882e44ce41ad9@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 1dbd9ceb390c ("fs: open block device after superblock creation") /dev/nullb0: Can't open blockdev ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5047 at fs/erofs/super.c:862 erofs_kill_sb+0x206/0x260 fs/erofs/super.c:862 Modules linked in: CPU: 0 PID: 5047 Comm: syz-executor356 Not tainted 6.5.0-rc3-next-20230728-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 RIP: 0010:erofs_kill_sb+0x206/0x260 fs/erofs/super.c:862 Code: 00 00 5b 5d 41 5c 41 5d e9 e7 27 b7 fd e8 e2 27 b7 fd 48 89 df e8 6a 81 1b fe 5b 5d 41 5c 41 5d e9 cf 27 b7 fd e8 ca 27 b7 fd <0f> 0b e9 41 fe ff ff e8 5e f6 0b fe e9 1a fe ff ff e8 54 f6 0b fe RSP: 0018:ffffc90003c2fca0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888029aee000 RCX: 0000000000000000 RDX: ffff8880268e9dc0 RSI: ffffffff83cfdc26 RDI: 0000000000000007 RBP: 00000000e0f5e1e2 R08: 0000000000000007 R09: 00000000e0f5e1e2 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 1ffff92000785fa0 R14: 00000000fffffff0 R15: ffff88807d747cf8 FS: 0000555556001380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055aecc7b6468 CR3: 000000007b9d9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> deactivate_locked_super+0x9a/0x170 fs/super.c:330 get_tree_bdev+0x4c7/0x6a0 fs/super.c:1347 vfs_get_tree+0x88/0x350 fs/super.c:1521 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7610a75f09 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fffaf351d38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 6c756e2f7665642f RCX: 00007f7610a75f09 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000555556002378 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffaf351d70 R14: 00007fffaf351d5c R15: 00007f7610abf03b </TASK> --- 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@xxxxxxxxxxxxxxxx. 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 bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
