INFO: task syz-executor816:10652 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-executor816 D23984 10652 10651 0x00004002 Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4082 schedule+0xdc/0x2b0 kernel/sched/core.c:4156 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136 __flush_work+0x4fe/0xa50 kernel/workqueue.c:3041 __cancel_work_timer+0x3d9/0x540 kernel/workqueue.c:3128 cancel_delayed_work_sync+0x1b/0x20 kernel/workqueue.c:3260 htable_destroy net/netfilter/xt_hashlimit.c:406 [inline] htable_put+0x15f/0x220 net/netfilter/xt_hashlimit.c:435 hashlimit_mt_destroy+0x56/0x70 net/netfilter/xt_hashlimit.c:971 cleanup_match+0xde/0x170 net/ipv6/netfilter/ip6_tables.c:478 find_check_entry.isra.0+0x454/0x920 net/ipv4/netfilter/ip_tables.c:564 translate_table+0xcb4/0x17d0 net/ipv4/netfilter/ip_tables.c:717 do_replace net/ipv4/netfilter/ip_tables.c:1136 [inline] do_ipt_set_ctl+0x2fe/0x4c2 net/ipv4/netfilter/ip_tables.c:1672 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1260 [inline] ip_setsockopt+0xdf/0x100 net/ipv4/ip_sockglue.c:1240 tcp_setsockopt net/ipv4/tcp.c:3165 [inline] tcp_setsockopt+0x8f/0xe0 net/ipv4/tcp.c:3159 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3149 __sys_setsockopt+0x261/0x4c0 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2143 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4464a9 Code: 20 61 74 20 25 73 3a 25 64 2c 20 74 68 72 65 61 64 20 25 73 0a 00 00 00 00 25 31 30 2e 31 30 6c 64 20 74 69 6d 65 73 20 63 61 <6c> 6c 65 64 3a 20 25 73 3a 25 64 3a 25 73 0a 00 00 00 00 00 00 00 RSP: 002b:00007ffdecc61778 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004464a9 RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00000000000003e0 R09: 0000000000000003 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00000000004077d0 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1134: #0: ffffffff89bac200 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5333 2 locks held by kworker/1:7/2711: 1 lock held by rsyslogd/10501: #0: ffff888093e7a120 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:821 2 locks held by getty/10623: #0: ffff8880a9a6e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000180b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10624: #0: ffff8880a6f3f090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10625: #0: ffff8880a272a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000186b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10626: #0: ffff88809d06a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10627: #0: ffff8880a4404090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000187b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10628: #0: ffff8880a90d9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000184b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10629: #0: ffff8880a2c6e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017b32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor816/10652: #0: ffffffff8a7cb060 (hashlimit_mutex){+.+.}, at: htable_put+0x21/0x220 net/netfilter/xt_hashlimit.c:432 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1134 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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb11/0x10c0 kernel/hung_task.c:289 kthread+0x361/0x430 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: 2711 Comm: kworker/1:7 Not tainted 5.5.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient htable_gc RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:163 [inline] RIP: 0010:mark_lock+0xb5/0x1220 kernel/locking/lockdep.c:3642 Code: 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 8d 0e 00 00 41 0f b7 5d 20 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 f8 06 <48> 8d 3c c5 60 0b 51 8b e8 ce 45 59 00 48 0f a3 1d 56 64 f6 09 0f RSP: 0018:ffffc900081afb68 EFLAGS: 00000002 RAX: 0000000000000007 RBX: 00000000000001d2 RCX: 0000000000000000 RDX: 1ffff1101403294f RSI: 0000000000000008 RDI: ffff8880a01941c0 RBP: ffffc900081afbb8 R08: ffff8880a01941c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 R13: ffff8880a0194a58 R14: dffffc0000000000 R15: ffff8880a0194a58 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000445828 CR3: 000000009f37d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_held_locks+0xa4/0xf0 kernel/locking/lockdep.c:3359 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3380 [inline] lockdep_hardirqs_on+0x19e/0x5e0 kernel/locking/lockdep.c:3433 trace_hardirqs_on+0x67/0x240 kernel/trace/trace_preemptirq.c:31 __local_bh_enable_ip+0x15a/0x270 kernel/softirq.c:194 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x2c/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:383 [inline] htable_selective_cleanup+0x232/0x340 net/netfilter/xt_hashlimit.c:373 htable_gc+0x21/0xb0 net/netfilter/xt_hashlimit.c:384 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352