RDS: rds_bind could not find a transport for 172.20.0.170, load rds_tcp or rds_rdma? ============================================ WARNING: possible recursive locking detected 4.14.0+ #179 Not tainted -------------------------------------------- syz-executor1/25688 is trying to acquire lock: (&q->blk_trace_mutex){+.+.}, at: [] blk_trace_remove+0x21/0x40 kernel/trace/blktrace.c:373 but task is already holding lock: (&q->blk_trace_mutex){+.+.}, at: [] blk_trace_setup+0x38/0x70 kernel/trace/blktrace.c:606 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&q->blk_trace_mutex); lock(&q->blk_trace_mutex); *** DEADLOCK *** May be due to missing lock nesting notation 1 lock held by syz-executor1/25688: #0: (&q->blk_trace_mutex){+.+.}, at: [] blk_trace_setup+0x38/0x70 kernel/trace/blktrace.c:606 stack backtrace: CPU: 1 PID: 25688 Comm: syz-executor1 Not tainted 4.14.0+ #179 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_deadlock_bug kernel/locking/lockdep.c:1809 [inline] check_deadlock kernel/locking/lockdep.c:1856 [inline] validate_chain kernel/locking/lockdep.c:2457 [inline] __lock_acquire+0x11c1/0x4840 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 blk_trace_remove+0x21/0x40 kernel/trace/blktrace.c:373 __blk_trace_setup+0x12b/0x140 kernel/trace/blktrace.c:594 blk_trace_setup+0x4d/0x70 kernel/trace/blktrace.c:607 sg_ioctl+0xc77/0x2da0 drivers/scsi/sg.c:1089 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007f49f6f3ebe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452879 RDX: 000000002084cf90 RSI: 00000000c0481273 RDI: 0000000000000014 RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f6ef0 R13: 00000000ffffffff R14: 00007f49f6f3f6d4 R15: 0000000000000013