====================================================== WARNING: possible circular locking dependency detected 4.14.226-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:6/10936 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/u4:6/10936: #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: 1 PID: 10936 Comm: kworker/u4:6 Not tainted 4.14.226-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+0x1b2/0x281 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 binder: 11651:11655 ioctl c018620c 20000000 returned -22 binder: 11651:11661 ioctl c018620c 20000000 returned -22 binder: 11686:11688 ioctl 50009401 20000280 returned -22 binder: 11686:11700 ioctl 50009401 20000280 returned -22 overlayfs: filesystem on './file0' not supported as upperdir binder: 11846:11856 ioctl c018620c 20000040 returned -22 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 1 PID: 11938 Comm: syz-executor.3 Not tainted 4.14.226-syzkaller #0 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+0x1b2/0x281 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x149 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc_trace+0x29a/0x3d0 mm/slab.c:3616 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] binder_get_thread drivers/android/binder.c:4246 [inline] binder_get_thread+0x1a9/0x830 drivers/android/binder.c:4237 binder_ioctl+0x170/0xf80 drivers/android/binder.c:4544 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465f69 Unknown ioctl -1070571007 RSP: 002b:00007fee8bee5188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000000000000 RSI: 0000000040046208 RDI: 0000000000000003 RBP: 00007fee8bee51d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff049f2f3f R14: 00007fee8bee5300 R15: 0000000000022000 Unknown ioctl -1070571007 binder: 11935:11938 ioctl 40046208 0 returned -12 binder: 12109:12112 ioctl 40087602 20000000 returned -22 binder: 12109:12112 ioctl 40087602 20000000 returned -22 print_req_error: I/O error, dev loop5, sector 0 print_req_error: I/O error, dev loop5, sector 8 binder: 12210:12215 ioctl 40286608 20000000 returned -22 binder: 12210:12229 ioctl 40286608 20000000 returned -22 xt_ecn: cannot match TCP bits in rule for non-tcp packets binder: 12491:12493 ioctl c010f508 20000000 returned -22 binder: 12491:12496 ioctl c010f508 20000000 returned -22 binder: 12578:12579 ioctl 40089416 20000040 returned -22 binder: 12578:12583 ioctl 40089416 20000040 returned -22 caif:caif_disconnect_client(): nothing to disconnect caif:caif_disconnect_client(): nothing to disconnect 9p: Unknown access argument 18446744073709551615@º\G 9p: Unknown access argument 18446744073709551615@º\G