====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor728/12995 is trying to acquire lock: 000000001eb09c18 (&rs->rs_recv_lock){....}, at: rds_wake_sk_sleep+0x1d/0xc0 net/rds/af_rds.c:109 but task is already holding lock: 0000000063aa4bb2 (&(&rm->m_rs_lock)->rlock){....}, at: rds_send_remove_from_sock+0x278/0x8b0 net/rds/send.c:618 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&(&rm->m_rs_lock)->rlock){....}: rds_message_purge net/rds/message.c:138 [inline] rds_message_put+0x198/0xd00 net/rds/message.c:180 rds_inc_put+0xf9/0x140 net/rds/recv.c:87 rds_clear_recv_queue+0x147/0x350 net/rds/recv.c:762 rds_release+0xc6/0x350 net/rds/af_rds.c:73 __sock_release+0xcd/0x2a0 net/socket.c:599 sock_close+0x15/0x20 net/socket.c:1214 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&rs->rs_recv_lock){....}: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0x93/0xd0 kernel/locking/spinlock.c:224 rds_wake_sk_sleep+0x1d/0xc0 net/rds/af_rds.c:109 rds_send_remove_from_sock+0xb1/0x8b0 net/rds/send.c:624 rds_send_path_drop_acked+0x2de/0x3c0 net/rds/send.c:700 rds_tcp_write_space+0x199/0x650 net/rds/tcp_send.c:203 tcp_new_space net/ipv4/tcp_input.c:5167 [inline] tcp_check_space+0x407/0x6f0 net/ipv4/tcp_input.c:5178 tcp_data_snd_check net/ipv4/tcp_input.c:5188 [inline] tcp_rcv_established+0x916/0x1ef0 net/ipv4/tcp_input.c:5681 tcp_v4_do_rcv+0x5d6/0x870 net/ipv4/tcp_ipv4.c:1547 sk_backlog_rcv include/net/sock.h:952 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2362 release_sock+0x54/0x1b0 net/core/sock.c:2901 do_tcp_setsockopt.constprop.0+0x42e/0x2340 net/ipv4/tcp.c:3098 tcp_setsockopt net/ipv4/tcp.c:3110 [inline] tcp_setsockopt+0xb2/0xd0 net/ipv4/tcp.c:3102 kernel_setsockopt+0x106/0x1c0 net/socket.c:3563 rds_tcp_cork net/rds/tcp_send.c:43 [inline] rds_tcp_xmit_path_complete+0xbf/0x100 net/rds/tcp_send.c:57 rds_send_xmit+0x13b5/0x2290 net/rds/send.c:410 rds_sendmsg+0x289d/0x2ea0 net/rds/send.c:1367 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 __sys_sendto+0x21a/0x320 net/socket.c:1899 __do_sys_sendto net/socket.c:1911 [inline] __se_sys_sendto net/socket.c:1907 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1907 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&(&rm->m_rs_lock)->rlock); lock(&rs->rs_recv_lock); lock(&(&rm->m_rs_lock)->rlock); lock(&rs->rs_recv_lock); *** DEADLOCK *** 3 locks held by syz-executor728/12995: #0: 00000000589d3912 (k-sk_lock-AF_INET){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000589d3912 (k-sk_lock-AF_INET){+.+.}, at: do_tcp_setsockopt.constprop.0+0x13f/0x2340 net/ipv4/tcp.c:2816 #1: 00000000b5d5c10f (k-clock-AF_INET){++.-}, at: rds_tcp_write_space+0x25/0x650 net/rds/tcp_send.c:189 #2: 0000000063aa4bb2 (&(&rm->m_rs_lock)->rlock){....}, at: rds_send_remove_from_sock+0x278/0x8b0 net/rds/send.c:618 stack backtrace: CPU: 1 PID: 12995 Comm: syz-executor728 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0x93/0xd0 kernel/locking/spinlock.c:224 rds_wake_sk_sleep+0x1d/0xc0 net/rds/af_rds.c:109 rds_send_remove_from_sock+0xb1/0x8b0 net/rds/send.c:624 rds_send_path_drop_acked+0x2de/0x3c0 net/rds/send.c:700 rds_tcp_write_space+0x199/0x650 net/rds/tcp_send.c:203 tcp_new_space net/ipv4/tcp_input.c:5167 [inline] tcp_check_space+0x407/0x6f0 net/ipv4/tcp_input.c:5178 tcp_data_snd_check net/ipv4/tcp_input.c:5188 [inline] tcp_rcv_established+0x916/0x1ef0 net/ipv4/tcp_input.c:5681 tcp_v4_do_rcv+0x5d6/0x870 net/ipv4/tcp_ipv4.c:1547 sk_backlog_rcv include/net/sock.h:952 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2362 release_sock+0x54/0x1b0 net/core/sock.c:2901 do_tcp_setsockopt.constprop.0+0x42e/0x2340 net/ipv4/tcp.c:3098 tcp_setsockopt net/ipv4/tcp.c:3110 [inline] tcp_setsockopt+0xb2/0xd0 net/ipv4/tcp.c:3102 kernel_setsockopt+0x106/0x1c0 net/socket.c:3563 rds_tcp_cork net/rds/tcp_send.c:43 [inline] rds_tcp_xmit_path_complete+0xbf/0x100 net/rds/tcp_send.c:57 rds_send_xmit+0x13b5/0x2290 net/rds/send.c:410 rds_sendmsg+0x289d/0x2ea0 net/rds/send.c:1367 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 __sys_sendto+0x21a/0x320 net/socket.c:1899 __do_sys_sendto net/socket.c:1911 [inline] __se_sys_sendto net/socket.c:1907 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1907 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f31e6ecc079 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 18 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:00007f31e6e71308 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f31e6f53268 RCX: 00007f31e6ecc079 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f31e6f53260 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f31e6f1a74c R13: 00007ffed006e09f R14: 00007f31e6e71400 R15: 0000000000022000