Hello, syzbot found the following issue on: HEAD commit: bf9f243f23e6 Merge tag '5.15-rc-ksmbd-part2' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=171c4ec7300000 kernel config: https://syzkaller.appspot.com/x/.config?x=e87940ff463e6c56 dashboard link: https://syzkaller.appspot.com/bug?extid=284f5086a790a6246920 compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+284f5086a790a6246920@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 8391 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 8391 Comm: syz-executor.4 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25 Code: c7 60 d4 b3 8a 31 c0 e8 61 22 3d fd 0f 0b eb a3 e8 28 eb 71 fd c6 05 65 2e b8 09 01 48 c7 c7 c0 d4 b3 8a 31 c0 e8 43 22 3d fd <0f> 0b eb 85 e8 0a eb 71 fd c6 05 48 2e b8 09 01 48 c7 c7 20 d5 b3 RSP: 0018:ffffc90006557a08 EFLAGS: 00010246 RAX: 7631d2209bb18500 RBX: 0000000000000002 RCX: 0000000000040000 RDX: ffffc90011c64000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: 0000000000000002 R08: ffffffff81681fd2 R09: ffffed10173857a8 R10: ffffed10173857a8 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88801f90c968 R14: ffff888078a85000 R15: 0000000000000067 FS: 00007f49f645e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2be21000 CR3: 000000008081c000 CR4: 00000000001526f0 Call Trace: __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:702 [inline] sco_conn_del+0x242/0x2f0 net/bluetooth/sco.c:193 hci_disconn_cfm include/net/bluetooth/hci_core.h:1518 [inline] hci_conn_hash_flush+0x112/0x240 net/bluetooth/hci_conn.c:1608 hci_dev_do_close+0x93e/0xeb0 net/bluetooth/hci_core.c:1793 hci_rfkill_set_block+0x10f/0x180 net/bluetooth/hci_core.c:2233 rfkill_set_block+0x1f1/0x440 net/rfkill/core.c:344 rfkill_fop_write+0x5a4/0x760 net/rfkill/core.c:1268 vfs_write+0x320/0xe70 fs/read_write.c:592 ksys_write+0x18f/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f49f645e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffdc243488f R14: 00007f49f645e300 R15: 0000000000022000 --- 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.
