INFO: task kworker/u4:8:9883 blocked for more than 143 seconds. Not tainted 5.7.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:8 D26160 9883 2 0x80004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f90 kernel/sched/core.c:4156 schedule+0xd0/0x2a0 kernel/sched/core.c:4231 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4290 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7b3/0x13c0 kernel/locking/mutex.c:1103 ip_set_net_exit+0x194/0x5b0 net/netfilter/ipset/ip_set_core.c:2402 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 INFO: task syz-executor.4:11371 blocked for more than 143 seconds. Not tainted 5.7.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27464 11371 7268 0x00000004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f90 kernel/sched/core.c:4156 schedule+0xd0/0x2a0 kernel/sched/core.c:4231 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4290 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7b3/0x13c0 kernel/locking/mutex.c:1103 nfnl_lock net/netfilter/nfnetlink.c:62 [inline] nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 nfnetlink_rcv+0x1ac/0x420 net/netfilter/nfnetlink.c:563 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+0x6e6/0x810 net/socket.c:2352 ___sys_sendmsg+0x100/0x170 net/socket.c:2406 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca59 Code: Bad RIP value. RSP: 002b:00007fc5a64fbc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004fe220 RCX: 000000000045ca59 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000941 R14: 00000000004cc08d R15: 00007fc5a64fc6d4 Showing all locks held in the system: 7 locks held by kworker/u4:1/21: 2 locks held by kworker/u4:2/25: 1 lock held by khungtaskd/1146: #0: ffffffff899be040 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6482: #0: ffff88809b916370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 4 locks held by kworker/u4:8/9883: #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:279 [inline] #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff88821b039138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90005cd7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a586130 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 net/core/net_namespace.c:565 #3: ffffffff8d238a98 (&table[i].mutex){+.+.}-{3:3}, at: ip_set_net_exit+0x194/0x5b0 net/netfilter/ipset/ip_set_core.c:2402 3 locks held by syz-executor.4/11367: 1 lock held by syz-executor.4/11371: #0: ffffffff8d238a98 (&table[i].mutex){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: ffffffff8d238a98 (&table[i].mutex){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1146 Comm: khungtaskd Not tainted 5.7.0-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:351 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_connect_worker RIP: 0010:check_memory_region+0x16/0x190 mm/kasan/generic.c:191 Code: 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 03 0e 00 02 0f 1f 00 48 85 f6 0f 84 40 01 00 00 49 89 fa 41 54 0f b6 d2 49 01 f2 55 53 <0f> 82 20 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 0d RSP: 0018:ffffc90000dd7830 EFLAGS: 00000086 RAX: 0000000000000026 RBX: 0000000000000001 RCX: ffffffff8159769f RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8c31dad0 RBP: 0000000000000980 R08: 0000000000000000 R09: fffffbfff1863b59 R10: ffffffff8c31dad8 R11: fffffbfff1863b58 R12: 0000000000000004 R13: ffff8880a97ee580 R14: ffff8880a97eee50 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e1ee2a000 CR3: 00000000a4a69000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] check_wait_context kernel/locking/lockdep.c:4079 [inline] __lock_acquire+0x76f/0x4a70 kernel/locking/lockdep.c:4330 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4959 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] ipv6_chk_addr_and_flags+0xe8/0x800 net/ipv6/addrconf.c:1905 __inet6_bind+0x10d6/0x19e0 net/ipv6/af_inet6.c:381 inet6_bind+0xf0/0x159 net/ipv6/af_inet6.c:458 rds_tcp_conn_path_connect+0x39a/0x880 net/rds/tcp_connect.c:144 rds_connect_worker+0x1a5/0x2c0 net/rds/threads.c:176 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351