INFO: task syz-executor.2:21040 blocked for more than 143 seconds. Not tainted 5.7.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D26888 21040 20835 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4216 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ovs_lock net/openvswitch/datapath.c:105 [inline] ovs_dp_cmd_new+0x4dc/0xdb0 net/openvswitch/datapath.c:1687 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x627/0xdf0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fd7f5020469 Code: Bad RIP value. RSP: 002b:00007fd7f5710db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000452ee0 RCX: 00007fd7f5020469 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00000000006abf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f7 R14: 000000000041f0ac R15: 00007fd7f57115c0 INFO: task syz-executor.2:21044 blocked for more than 143 seconds. Not tainted 5.7.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27816 21044 20835 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4216 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ovs_lock net/openvswitch/datapath.c:105 [inline] ovs_dp_cmd_new+0x4dc/0xdb0 net/openvswitch/datapath.c:1687 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x627/0xdf0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fd7f5020469 Code: Bad RIP value. RSP: 002b:00007fd7f56cedb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000452ee0 RCX: 00007fd7f5020469 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00000000006ac040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f7 R14: 000000000041f0ac R15: 00007fd7f56cf5c0 Showing all locks held in the system: 1 lock held by khungtaskd/1139: #0: ffffffff899bea80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6825: #0: ffff8880a46801b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 5 locks held by kworker/u4:1/13794: #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880a9771938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90001617dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a576930 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 net/core/net_namespace.c:565 #3: ffffffff8a80d568 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock net/openvswitch/datapath.c:105 [inline] #3: ffffffff8a80d568 (ovs_mutex){+.+.}-{3:3}, at: ovs_exit_net+0x1e3/0xba0 net/openvswitch/datapath.c:2469 #4: ffffffff899c29e8 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x44/0x4b0 kernel/rcu/tree.c:3332 2 locks held by kworker/u4:7/24059: #0: ffff8880ae737998 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x9be/0xdb0 kernel/sched/fair.c:10511 #1: ffffc900017c7dc0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 2 locks held by syz-executor.2/21040: #0: ffffffff8a5d9d10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:745 #1: ffffffff8a80d568 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock net/openvswitch/datapath.c:105 [inline] #1: ffffffff8a80d568 (ovs_mutex){+.+.}-{3:3}, at: ovs_dp_cmd_new+0x4dc/0xdb0 net/openvswitch/datapath.c:1687 2 locks held by syz-executor.2/21044: #0: ffffffff8a5d9d10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:745 #1: ffffffff8a80d568 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock net/openvswitch/datapath.c:105 [inline] #1: ffffffff8a80d568 (ovs_mutex){+.+.}-{3:3}, at: ovs_dp_cmd_new+0x4dc/0xdb0 net/openvswitch/datapath.c:1687 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1139 Comm: khungtaskd Not tainted 5.7.0-rc2-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4096 Comm: systemd-journal Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:367 [inline] RIP: 0010:trace_kmem_cache_free include/trace/events/kmem.h:145 [inline] RIP: 0010:kmem_cache_free+0xc3/0x320 mm/slab.c:3697 Code: 0f 84 f8 01 00 00 4c 89 e7 57 9d 0f 1f 44 00 00 4c 8b 64 24 20 0f 1f 44 00 00 65 8b 05 76 e7 50 7e 83 f8 3f 0f 87 cb 01 00 00 <89> c0 48 0f a3 05 43 85 d8 08 0f 82 b7 00 00 00 5b 5d 41 5c 41 5d RSP: 0018:ffffc900015f7c70 EFLAGS: 00000293 RAX: 0000000000000001 RBX: ffff88805c404980 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000286 RBP: ffff8880aa1eb000 R08: ffff888093dc0580 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81bfaac1 R13: ffffffff81bfaac1 R14: ffff88805c404980 R15: ffffc900015f7eb0 FS: 00007f7c4673b8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7c427ad000 CR3: 0000000093c37000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x282/0x3e0 fs/namei.c:2362 user_path_at include/linux/namei.h:59 [inline] do_faccessat+0x248/0x7a0 fs/open.c:398 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7f7c459f79c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffcb94bad08 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffcb94bdd30 RCX: 00007f7c459f79c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055c0ffc4f9a3 RBP: 00007ffcb94bae50 R08: 000055c0ffc453e5 R09: 0000000000000018 R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055c0ffd718a0 R15: 00007ffcb94bb340