====================================================== WARNING: possible circular locking dependency detected 4.14.211-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:1/22 is trying to acquire lock: (k-sk_lock-AF_INET){+.+.}, at: [] lock_sock include/net/sock.h:1471 [inline] (k-sk_lock-AF_INET){+.+.}, at: [] do_tcp_setsockopt.constprop.0+0xfb/0x1c10 net/ipv4/tcp.c:2562 but task is already holding lock: ((&(&cp->cp_send_w)->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 ((&(&cp->cp_send_w)->work)){+.+.}: flush_work+0xad/0x770 kernel/workqueue.c:2889 __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2964 rds_tcp_reset_callbacks+0x18d/0x450 net/rds/tcp.c:167 rds_tcp_accept_one+0x61a/0x8b0 net/rds/tcp_listen.c:194 rds_tcp_accept_worker+0x4d/0x70 net/rds/tcp.c:407 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #0 (k-sk_lock-AF_INET){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 lock_sock_nested+0xb7/0x100 net/core/sock.c:2796 lock_sock include/net/sock.h:1471 [inline] do_tcp_setsockopt.constprop.0+0xfb/0x1c10 net/ipv4/tcp.c:2562 tcp_setsockopt net/ipv4/tcp.c:2830 [inline] tcp_setsockopt+0xa7/0xc0 net/ipv4/tcp.c:2822 kernel_setsockopt+0xfb/0x1b0 net/socket.c:3396 rds_tcp_cork net/rds/tcp_send.c:43 [inline] rds_tcp_xmit_path_prepare+0xaf/0xe0 net/rds/tcp_send.c:50 rds_send_xmit+0x1ae/0x1c00 net/rds/send.c:187 rds_send_worker+0x6d/0x240 net/rds/threads.c:189 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&(&cp->cp_send_w)->work)); lock(k-sk_lock-AF_INET); lock((&(&cp->cp_send_w)->work)); lock(k-sk_lock-AF_INET); *** DEADLOCK *** 2 locks held by kworker/u4:1/22: #0: ("%s""krdsd"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&(&cp->cp_send_w)->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 stack backtrace: CPU: 0 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 lock_sock_nested+0xb7/0x100 net/core/sock.c:2796 lock_sock include/net/sock.h:1471 [inline] do_tcp_setsockopt.constprop.0+0xfb/0x1c10 net/ipv4/tcp.c:2562 tcp_setsockopt net/ipv4/tcp.c:2830 [inline] tcp_setsockopt+0xa7/0xc0 net/ipv4/tcp.c:2822 kernel_setsockopt+0xfb/0x1b0 net/socket.c:3396 rds_tcp_cork net/rds/tcp_send.c:43 [inline] rds_tcp_xmit_path_prepare+0xaf/0xe0 net/rds/tcp_send.c:50 rds_send_xmit+0x1ae/0x1c00 net/rds/send.c:187 rds_send_worker+0x6d/0x240 net/rds/threads.c:189 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. VFS: unable to find oldfs superblock on device loop5 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. VFS: unable to find oldfs superblock on device loop5 xt_physdev: using --physdev-out and --physdev-is-out are only supported in the FORWARD and POSTROUTING chains with bridged traffic. print_req_error: I/O error, dev loop0, sector 0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. VFS: unable to find oldfs superblock on device loop5 ip6_tables: ip6tables: counters copy to user failed while replacing table netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. xt_physdev: using --physdev-out and --physdev-is-out are only supported in the FORWARD and POSTROUTING chains with bridged traffic. ip6_tables: ip6tables: counters copy to user failed while replacing table VFS: unable to find oldfs superblock on device loop5 netlink: 48 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop5 netlink: 40 bytes leftover after parsing attributes in process `syz-executor.0'. VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 netlink: 48 bytes leftover after parsing attributes in process `syz-executor.4'. VFS: unable to find oldfs superblock on device loop3 ieee80211 M: Selected rate control algorithm 'minstrel_ht' ieee80211 M: hwaddr 02:00:00:00:02:00 registered VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 print_req_error: I/O error, dev loop5, sector 4 Buffer I/O error on dev loop5, logical block 2, async page read VFS: unable to find oldfs superblock on device loop4 print_req_error: I/O error, dev loop5, sector 6 Buffer I/O error on dev loop5, logical block 3, async page read print_req_error: I/O error, dev loop4, sector 4 Buffer I/O error on dev loop4, logical block 2, async page read print_req_error: I/O error, dev loop4, sector 6 Buffer I/O error on dev loop4, logical block 3, async page read ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table ieee80211 phy3: Selected rate control algorithm 'minstrel_ht' ieee80211 phy3: hwaddr 02:00:00:00:03:00 registered ip_tables: iptables: counters copy to user failed while replacing table VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 ip_tables: iptables: counters copy to user failed while replacing table print_req_error: I/O error, dev loop5, sector 4 Buffer I/O error on dev loop5, logical block 2, async page read print_req_error: I/O error, dev loop5, sector 6 Buffer I/O error on dev loop5, logical block 3, async page read VFS: unable to find oldfs superblock on device loop3 ieee80211 phy4: Selected rate control algorithm 'minstrel_ht' VFS: unable to find oldfs superblock on device loop5 ieee80211 phy4: hwaddr 02:00:00:00:04:00 registered ip_tables: iptables: counters copy to user failed while replacing table VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop5 ip_tables: iptables: counters copy to user failed while replacing table print_req_error: I/O error, dev loop4, sector 4 Buffer I/O error on dev loop4, logical block 2, async page read print_req_error: I/O error, dev loop4, sector 6 Buffer I/O error on dev loop4, logical block 3, async page read print_req_error: I/O error, dev loop3, sector 4 Buffer I/O error on dev loop3, logical block 2, async page read print_req_error: I/O error, dev loop3, sector 6 Buffer I/O error on dev loop3, logical block 3, async page read VFS: unable to find oldfs superblock on device loop5 ip_tables: iptables: counters copy to user failed while replacing table VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 ieee80211 phy5: Selected rate control algorithm 'minstrel_ht' VFS: unable to find oldfs superblock on device loop5 print_req_error: I/O error, dev loop3, sector 4 Buffer I/O error on dev loop3, logical block 2, async page read print_req_error: I/O error, dev loop3, sector 6 Buffer I/O error on dev loop3, logical block 3, async page read print_req_error: I/O error, dev loop4, sector 4 Buffer I/O error on dev loop4, logical block 2, async page read print_req_error: I/O error, dev loop4, sector 6 Buffer I/O error on dev loop4, logical block 3, async page read ieee80211 phy5: hwaddr 02:00:00:00:05:00 registered VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop2 print_req_error: I/O error, dev loop3, sector 4 Buffer I/O error on dev loop3, logical block 2, async page read print_req_error: I/O error, dev loop3, sector 6 VFS: unable to find oldfs superblock on device loop5 Buffer I/O error on dev loop3, logical block 3, async page read VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop0 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop0 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop0 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop0 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop2 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop5 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop0 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop2 print_req_error: 45 callbacks suppressed print_req_error: I/O error, dev loop0, sector 4 buffer_io_error: 34 callbacks suppressed Buffer I/O error on dev loop0, logical block 2, async page read print_req_error: I/O error, dev loop0, sector 6 Buffer I/O error on dev loop0, logical block 3, async page read VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop3 VFS: unable to find oldfs superblock on device loop4 VFS: unable to find oldfs superblock on device loop0 VFS: unable to find oldfs superblock on device loop1 print_req_error: I/O error, dev loop1, sector 4 Buffer I/O error on dev loop1, logical block 2, async page read print_req_error: I/O error, dev loop1, sector 6 Buffer I/O error on dev loop1, logical block 3, async page read VFS: unable to find oldfs superblock on device loop1 VFS: unable to find oldfs superblock on device loop3