====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc7-syzkaller-00019-g99ec1ed7c2ed #0 Not tainted ------------------------------------------------------ kworker/u4:0/10 is trying to acquire lock: ffff88807f90acf0 (&rs->rs_recv_lock){...-}-{2:2}, at: rds_wake_sk_sleep+0x23/0xe0 net/rds/af_rds.c:109 but task is already holding lock: ffff888077bea100 (&rm->m_rs_lock){..-.}-{2:2}, at: rds_send_remove_from_sock+0x340/0x9e0 net/rds/send.c:628 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rm->m_rs_lock){..-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 rds_message_purge net/rds/message.c:138 [inline] rds_message_put+0x1dd/0xc30 net/rds/message.c:180 rds_inc_put net/rds/recv.c:83 [inline] rds_inc_put+0x13e/0x1a0 net/rds/recv.c:77 rds_clear_recv_queue+0x14b/0x350 net/rds/recv.c:768 rds_release+0xd8/0x3c0 net/rds/af_rds.c:73 __sock_release+0xcd/0x290 net/socket.c:653 sock_close+0x1c/0x20 net/socket.c:1397 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xaa3/0x29b0 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x2318/0x25b0 kernel/signal.c:2876 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&rs->rs_recv_lock){...-}-{2:2}: check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x49/0x90 kernel/locking/spinlock.c:236 rds_wake_sk_sleep+0x23/0xe0 net/rds/af_rds.c:109 rds_send_remove_from_sock+0xb9/0x9e0 net/rds/send.c:634 rds_send_path_drop_acked+0x2f3/0x3d0 net/rds/send.c:710 rds_tcp_write_space+0x1b5/0x6d0 net/rds/tcp_send.c:198 tcp_new_space net/ipv4/tcp_input.c:5483 [inline] tcp_check_space+0x11b/0x810 net/ipv4/tcp_input.c:5502 tcp_data_snd_check net/ipv4/tcp_input.c:5511 [inline] tcp_rcv_established+0x8be/0x1f90 net/ipv4/tcp_input.c:6021 tcp_v4_do_rcv+0x65a/0x9c0 net/ipv4/tcp_ipv4.c:1722 sk_backlog_rcv include/net/sock.h:1115 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2917 release_sock+0x58/0x1b0 net/core/sock.c:3484 rds_send_xmit+0xafc/0x2580 net/rds/send.c:422 rds_send_worker+0x96/0x2e0 net/rds/threads.c:200 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rm->m_rs_lock); lock(&rs->rs_recv_lock); lock(&rm->m_rs_lock); rlock(&rs->rs_recv_lock); *** DEADLOCK *** 5 locks held by kworker/u4:0/10: #0: ffff88814a5b7138 ((wq_completion)krdsd){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88814a5b7138 ((wq_completion)krdsd){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88814a5b7138 ((wq_completion)krdsd){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline] #0: ffff88814a5b7138 ((wq_completion)krdsd){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline] #0: ffff88814a5b7138 ((wq_completion)krdsd){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] #0: ffff88814a5b7138 ((wq_completion)krdsd){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc900000f7db0 ((work_completion)(&(&cp->cp_send_w)->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffff88807d0c56f0 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline] #2: ffff88807d0c56f0 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sock_set_cork+0x1a/0xa0 net/ipv4/tcp.c:3342 #3: ffff88807d0c5978 (k-clock-AF_INET){++.-}-{2:2}, at: rds_tcp_write_space+0x29/0x6d0 net/rds/tcp_send.c:184 #4: ffff888077bea100 (&rm->m_rs_lock){..-.}-{2:2}, at: rds_send_remove_from_sock+0x340/0x9e0 net/rds/send.c:628 stack backtrace: CPU: 1 PID: 10 Comm: kworker/u4:0 Not tainted 6.4.0-rc7-syzkaller-00019-g99ec1ed7c2ed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x49/0x90 kernel/locking/spinlock.c:236 rds_wake_sk_sleep+0x23/0xe0 net/rds/af_rds.c:109 rds_send_remove_from_sock+0xb9/0x9e0 net/rds/send.c:634 rds_send_path_drop_acked+0x2f3/0x3d0 net/rds/send.c:710 rds_tcp_write_space+0x1b5/0x6d0 net/rds/tcp_send.c:198 tcp_new_space net/ipv4/tcp_input.c:5483 [inline] tcp_check_space+0x11b/0x810 net/ipv4/tcp_input.c:5502 tcp_data_snd_check net/ipv4/tcp_input.c:5511 [inline] tcp_rcv_established+0x8be/0x1f90 net/ipv4/tcp_input.c:6021 tcp_v4_do_rcv+0x65a/0x9c0 net/ipv4/tcp_ipv4.c:1722 sk_backlog_rcv include/net/sock.h:1115 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2917 release_sock+0x58/0x1b0 net/core/sock.c:3484 rds_send_xmit+0xafc/0x2580 net/rds/send.c:422 rds_send_worker+0x96/0x2e0 net/rds/threads.c:200 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308