INFO: task kworker/u4:7:831 blocked for more than 143 seconds. Not tainted 5.5.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:7 D24184 831 2 0x80004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4082 schedule+0x188/0x210 kernel/sched/core.c:4156 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4215 __mutex_lock_common+0x11f1/0x2f30 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1118 hashlimit_proc_net_exit net/netfilter/xt_hashlimit.c:1253 [inline] hashlimit_net_exit+0x40/0x210 net/netfilter/xt_hashlimit.c:1276 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x6f8/0xb80 net/core/net_namespace.c:589 process_one_work+0x7f5/0x10f0 kernel/workqueue.c:2264 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task syz-executor.2:15231 blocked for more than 143 seconds. Not tainted 5.5.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28648 15231 15154 0x00004004 Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4082 schedule+0x188/0x210 kernel/sched/core.c:4156 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4215 __mutex_lock_common+0x11f1/0x2f30 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1118 hashlimit_mt_check_common+0x4da/0x1020 net/netfilter/xt_hashlimit.c:889 hashlimit_mt_check+0x7e/0x90 net/netfilter/xt_hashlimit.c:949 xt_check_match+0x6e0/0xb60 net/netfilter/x_tables.c:501 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline] find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:557 [inline] translate_table+0x159b/0x22e0 net/ipv6/netfilter/ip6_tables.c:734 do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline] do_ip6t_set_ctl+0x2c3/0x550 net/ipv6/netfilter/ip6_tables.c:1681 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x27a/0x2a0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x9a/0x160 net/ipv6/ipv6_sockglue.c:949 udpv6_setsockopt+0x7b/0x90 net/ipv6/udp.c:1564 sock_common_setsockopt+0x99/0xb0 net/core/sock.c:3149 __sys_setsockopt+0x582/0x720 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2143 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: Bad RIP value. RSP: 002b:00007f6785264c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f67852656d4 RCX: 000000000045b349 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000490 R09: 0000000000000000 R10: 0000000020000a00 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a00 R14: 00000000004d4468 R15: 000000000075bf2c INFO: task syz-executor.2:15301 blocked for more than 143 seconds. Not tainted 5.5.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28840 15301 15154 0x00004004 Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4082 schedule+0x188/0x210 kernel/sched/core.c:4156 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4215 __mutex_lock_common+0x11f1/0x2f30 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1118 hashlimit_mt_check_common+0x4da/0x1020 net/netfilter/xt_hashlimit.c:889 hashlimit_mt_check+0x7e/0x90 net/netfilter/xt_hashlimit.c:949 xt_check_match+0x6e0/0xb60 net/netfilter/x_tables.c:501 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline] find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:557 [inline] translate_table+0x159b/0x22e0 net/ipv6/netfilter/ip6_tables.c:734 do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline] do_ip6t_set_ctl+0x2c3/0x550 net/ipv6/netfilter/ip6_tables.c:1681 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x27a/0x2a0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x9a/0x160 net/ipv6/ipv6_sockglue.c:949 udpv6_setsockopt+0x7b/0x90 net/ipv6/udp.c:1564 sock_common_setsockopt+0x99/0xb0 net/core/sock.c:3149 __sys_setsockopt+0x582/0x720 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2143 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: Bad RIP value. RSP: 002b:00007f6785222c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f67852236d4 RCX: 000000000045b349 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000075c070 R08: 0000000000000490 R09: 0000000000000000 R10: 0000000020000a00 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a00 R14: 00000000004d4468 R15: 000000000075c07c Showing all locks held in the system: 4 locks held by kworker/u4:7/831: #0: ffff88821bb8e528 ((wq_completion)netns){+.+.}, at: spin_unlock_irq include/linux/spinlock.h:388 [inline] #0: ffff88821bb8e528 ((wq_completion)netns){+.+.}, at: process_one_work+0x763/0x10f0 kernel/workqueue.c:2237 #1: ffffc90002ba7d78 (net_cleanup_work){+.+.}, at: process_one_work+0x7a5/0x10f0 kernel/workqueue.c:2239 #2: ffffffff895848a8 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa5/0xb80 net/core/net_namespace.c:551 #3: ffffffff895a35f0 (hashlimit_mutex){+.+.}, at: hashlimit_proc_net_exit net/netfilter/xt_hashlimit.c:1253 [inline] #3: ffffffff895a35f0 (hashlimit_mutex){+.+.}, at: hashlimit_net_exit+0x40/0x210 net/netfilter/xt_hashlimit.c:1276 1 lock held by khungtaskd/1100: #0: ffffffff892d9d48 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 1 lock held by rsyslogd/8659: #0: ffff8880a0c428e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x279/0x310 fs/file.c:821 2 locks held by getty/8748: #0: ffff888099f72090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900016bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8749: #0: ffff88809d7ad090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900016db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8750: #0: ffff8880a6e9d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000173b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8751: #0: ffff8880a6508090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017072e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8752: #0: ffff8880a8563090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000172b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8753: #0: ffff8880a228a090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000174b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8754: #0: ffff8880a6ee6090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000169b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/15165: 1 lock held by syz-executor.2/15231: #0: ffffffff895a35f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 net/netfilter/xt_hashlimit.c:889 1 lock held by syz-executor.2/15301: #0: ffffffff895a35f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 net/netfilter/xt_hashlimit.c:889 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1100 Comm: khungtaskd Not tainted 5.5.0-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd40/0xd60 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 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: 15165 Comm: syz-executor.2 Not tainted 5.5.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x22/0x270 kernel/locking/lockdep.c:4013 Code: 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 50 49 89 f5 49 89 fc 48 ba 00 00 00 00 00 fc ff df 48 8d 5f 10 <48> 89 d8 48 c1 e8 03 80 3c 10 00 74 0e 48 89 df 49 89 d6 e8 16 79 RSP: 0018:ffffc900017b78f8 EFLAGS: 00000046 RAX: 1ffffffff1255a00 RBX: ffff888020326d68 RCX: ffffffff815c2f47 RDX: dffffc0000000000 RSI: ffffffff892d9d68 RDI: ffff888020326d58 RBP: ffffc900017b7928 R08: ffff888020326d18 R09: fffffbfff140492e R10: fffffbfff140492e R11: 0000000000000000 R12: ffff888020326d58 R13: ffffffff892d9d68 R14: 0000000000000000 R15: 1ffff11004064daa FS: 00007f6785265700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000544b4000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:4305 [inline] lock_is_held_type+0x11d/0x2b0 kernel/locking/lockdep.c:4521 lock_is_held include/linux/lockdep.h:361 [inline] ___might_sleep+0x3e/0x5e0 kernel/sched/core.c:6765 htable_selective_cleanup+0x291/0x320 net/netfilter/xt_hashlimit.c:374 htable_destroy net/netfilter/xt_hashlimit.c:408 [inline] htable_put+0x213/0x2a0 net/netfilter/xt_hashlimit.c:435 hashlimit_mt_destroy+0x5b/0x70 net/netfilter/xt_hashlimit.c:971 cleanup_match net/ipv6/netfilter/ip6_tables.c:478 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:582 [inline] translate_table+0x1b9a/0x22e0 net/ipv6/netfilter/ip6_tables.c:734 do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline] do_ip6t_set_ctl+0x2c3/0x550 net/ipv6/netfilter/ip6_tables.c:1681 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x27a/0x2a0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x9a/0x160 net/ipv6/ipv6_sockglue.c:949 udpv6_setsockopt+0x7b/0x90 net/ipv6/udp.c:1564 sock_common_setsockopt+0x99/0xb0 net/core/sock.c:3149 __sys_setsockopt+0x582/0x720 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2143 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6785264c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f67852656d4 RCX: 000000000045b349 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000490 R09: 0000000000000000 R10: 0000000020000a00 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a00 R14: 00000000004d4468 R15: 000000000075bf2c