====================================================== WARNING: possible circular locking dependency detected 6.6.0-syzkaller-15859-g89cdf9d55601 #0 Not tainted ------------------------------------------------------ syz-executor.0/5521 is trying to acquire lock: ffff88807ecb2100 (&rm->m_rs_lock){....}-{2:2}, at: rds_message_purge net/rds/message.c:138 [inline] ffff88807ecb2100 (&rm->m_rs_lock){....}-{2:2}, at: rds_message_put+0x1dd/0xc40 net/rds/message.c:180 but task is already holding lock: ffff8880216e2530 (&rs->rs_recv_lock){....}-{2:2}, at: rds_clear_recv_queue+0x33/0x350 net/rds/recv.c:762 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rs->rs_recv_lock){....}-{2:2}: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236 rds_wake_sk_sleep+0x23/0xe0 net/rds/af_rds.c:109 rds_send_remove_from_sock+0x1e9/0xa50 net/rds/send.c:634 rds_send_path_drop_acked+0x2f4/0x3c0 net/rds/send.c:710 rds_tcp_write_space+0x1b5/0x6d0 net/rds/tcp_send.c:199 tcp_new_space net/ipv4/tcp_input.c:5611 [inline] tcp_check_space+0x178/0x8c0 net/ipv4/tcp_input.c:5630 tcp_data_snd_check net/ipv4/tcp_input.c:5639 [inline] tcp_rcv_established+0x953/0x20d0 net/ipv4/tcp_input.c:6157 tcp_v4_do_rcv+0x68c/0xa10 net/ipv4/tcp_ipv4.c:1906 sk_backlog_rcv include/net/sock.h:1121 [inline] __release_sock+0x132/0x3a0 net/core/sock.c:2968 release_sock+0x5a/0x1f0 net/core/sock.c:3534 rds_send_xmit+0x164f/0x2490 net/rds/send.c:422 rds_sendmsg+0x2af0/0x31e0 net/rds/send.c:1381 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 __sys_sendto+0x255/0x340 net/socket.c:2190 __do_sys_sendto net/socket.c:2202 [inline] __se_sys_sendto net/socket.c:2198 [inline] __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #0 (&rm->m_rs_lock){....}-{2:2}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162 rds_message_purge net/rds/message.c:138 [inline] rds_message_put+0x1dd/0xc40 net/rds/message.c:180 rds_inc_put net/rds/recv.c:83 [inline] rds_inc_put+0x13c/0x1a0 net/rds/recv.c:77 rds_clear_recv_queue+0x14c/0x350 net/rds/recv.c:768 rds_release+0xdb/0x3c0 net/rds/af_rds.c:73 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1419 __fput+0x270/0xbb0 fs/file_table.c:394 __fput_sync+0x47/0x50 fs/file_table.c:475 __do_sys_close fs/open.c:1590 [inline] __se_sys_close fs/open.c:1575 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1575 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rs->rs_recv_lock); lock(&rm->m_rs_lock); lock(&rs->rs_recv_lock); lock(&rm->m_rs_lock); *** DEADLOCK *** 2 locks held by syz-executor.0/5521: #0: ffff88807836dc10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #0: ffff88807836dc10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x260 net/socket.c:658 #1: ffff8880216e2530 (&rs->rs_recv_lock){....}-{2:2}, at: rds_clear_recv_queue+0x33/0x350 net/rds/recv.c:762 stack backtrace: CPU: 0 PID: 5521 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-15859-g89cdf9d55601 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162 rds_message_purge net/rds/message.c:138 [inline] rds_message_put+0x1dd/0xc40 net/rds/message.c:180 rds_inc_put net/rds/recv.c:83 [inline] rds_inc_put+0x13c/0x1a0 net/rds/recv.c:77 rds_clear_recv_queue+0x14c/0x350 net/rds/recv.c:768 rds_release+0xdb/0x3c0 net/rds/af_rds.c:73 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1419 __fput+0x270/0xbb0 fs/file_table.c:394 __fput_sync+0x47/0x50 fs/file_table.c:475 __do_sys_close fs/open.c:1590 [inline] __se_sys_close fs/open.c:1575 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1575 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f76a647b85a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 f3 7d 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 53 7e 02 00 8b 44 24 RSP: 002b:00007fff47962430 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f76a647b85a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000032 R08: 0000001b2f060000 R09: 00007f76a659c12c R10: 00007fff47962580 R11: 0000000000000293 R12: 00007f76a6000a20 R13: ffffffffffffffff R14: 00007f76a6000000 R15: 000000000001a581