Hello, syzbot found the following issue on: HEAD commit: 200e340f2196 Merge tag 'pull-work.dcache' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1634c29e080000 kernel config: https://syzkaller.appspot.com/x/.config?x=1b664fba5e66c4bf dashboard link: https://syzkaller.appspot.com/bug?extid=31c9594f6e43b9289b25 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131893fe080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+31c9594f6e43b9289b25@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3818 at block/blk-mq.c:3881 blk_mq_release+0x115/0x2d0 Modules linked in: CPU: 1 PID: 3818 Comm: syz-executor.0 Not tainted 5.19.0-syzkaller-02972-g200e340f2196 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:blk_mq_release+0x115/0x2d0 block/blk-mq.c:3881 Code: 89 ef 4c 89 e6 48 c7 c2 ff ff ff ff b9 08 00 00 00 e8 ef bd 50 00 48 85 c0 74 13 48 89 c3 e8 12 05 71 fd eb b0 e8 0b 05 71 fd <0f> 0b eb d1 e8 02 05 71 fd eb 05 e8 fb 04 71 fd 48 8b 44 24 10 4c RSP: 0018:ffffc90003affbc0 EFLAGS: 00010293 RAX: ffffffff84171ba5 RBX: ffff888078c482a8 RCX: ffff8880743b8000 RDX: 0000000000000000 RSI: ffffffff8a8d4160 RDI: ffffffff8ae9a7c0 RBP: ffffc90003affc90 R08: dffffc0000000000 R09: fffffbfff1c07946 R10: fffffbfff1c07946 R11: 1ffffffff1c07945 R12: ffffc90003affc20 R13: ffff888020751718 R14: dffffc0000000000 R15: ffff888020751868 FS: 00007f0eea256700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f101f96d058 CR3: 000000001df33000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> blk_release_queue+0x13d/0x210 block/blk-sysfs.c:780 kobject_cleanup+0x235/0x470 lib/kobject.c:673 __alloc_disk_node+0x359/0x540 block/genhd.c:1388 __blk_mq_alloc_disk+0x11b/0x1e0 block/blk-mq.c:3961 loop_add+0x325/0x9b0 drivers/block/loop.c:1978 loop_control_get_free drivers/block/loop.c:2139 [inline] loop_control_ioctl+0x39a/0x770 drivers/block/loop.c:2154 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0ee9089279 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f0eea256168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0ee919c050 RCX: 00007f0ee9089279 RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000004 RBP: 00007f0eea2561d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffe6368d72f R14: 00007f0eea256300 R15: 0000000000022000 </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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
