IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets INFO: task syz-executor.1:2535 blocked for more than 140 seconds. Not tainted 4.19.98-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27720 2535 2513 0x00000006 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_timeout+0x8c8/0xfc0 kernel/time/timer.c:1782 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+0x49f/0x870 kernel/workqueue.c:2926 __cancel_work_timer+0x3bf/0x520 kernel/workqueue.c:3013 cancel_delayed_work_sync+0x1b/0x20 kernel/workqueue.c:3145 htable_destroy net/netfilter/xt_hashlimit.c:414 [inline] htable_put+0x15f/0x220 net/netfilter/xt_hashlimit.c:443 hashlimit_mt_destroy_v1+0x50/0x70 net/netfilter/xt_hashlimit.c:972 cleanup_match+0xde/0x170 net/ipv6/netfilter/ip6_tables.c:481 find_check_entry.isra.0+0x4da/0x9d0 net/ipv6/netfilter/ip6_tables.c:585 translate_table+0xd15/0x1860 net/ipv6/netfilter/ip6_tables.c:737 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0x2ef/0x498 net/ipv6/netfilter/ip6_tables.c:1684 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt net/ipv6/ipv6_sockglue.c:938 [inline] ipv6_setsockopt+0x13e/0x170 net/ipv6/ipv6_sockglue.c:922 tcp_setsockopt net/ipv4/tcp.c:3075 [inline] tcp_setsockopt+0x8f/0xe0 net/ipv4/tcp.c:3069 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3046 __sys_setsockopt+0x17a/0x280 net/socket.c:1901 __do_sys_setsockopt net/socket.c:1912 [inline] __se_sys_setsockopt net/socket.c:1909 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1909 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: Bad RIP value. RSP: 002b:00007fbbff22cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fbbff22d6d4 RCX: 000000000045b349 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 00000000000003d8 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009d7 R14: 00000000004d3f88 R15: 000000000075bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1082: #0: 0000000004889e69 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by khugepaged/1089: #0: 0000000049387c7d (pcpu_drain_mutex){+.+.}, at: drain_all_pages+0x4d/0x570 mm/page_alloc.c:2654 1 lock held by udevd/3775: 2 locks held by rs:main Q:Reg/7946: 1 lock held by rsyslogd/7948: #0: 00000000b2641654 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/8071: #0: 000000002dfaa48c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d39c2b82 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8072: #0: 00000000ed3ff435 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000009b97812e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8073: #0: 000000000aa858cd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000000893713e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8074: #0: 00000000bc8613f4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000a814d141 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8075: #0: 000000006ff3d851 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000004a69269 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8076: #0: 00000000b0e53d2f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000016db197d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8077: #0: 00000000ca5aa79c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000009a2a6347 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by kworker/0:1/1067: 1 lock held by syz-executor.1/2535: #0: 000000006ce5ba02 (hashlimit_mutex){+.+.}, at: htable_put+0x21/0x220 net/netfilter/xt_hashlimit.c:440 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1082 Comm: khungtaskd Not tainted 4.19.98-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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1067 Comm: kworker/0:1 Not tainted 4.19.98-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient htable_gc RIP: 0010:match_held_lock+0xb/0x500 kernel/locking/lockdep.c:3471 Code: ff e8 89 3a 51 00 e9 b3 fe ff ff 48 c7 c7 a8 5c f2 88 e8 d8 39 51 00 e9 1d ff ff ff 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 c7 10 48 89 fa RSP: 0018:ffff88804a977be0 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: ffff888090f7e440 RCX: ffff888090f7ecc0 RDX: 0000000000000000 RSI: ffffffff88f95be0 RDI: ffff888090f7ece8 RBP: ffff88804a977c30 R08: ffff888090f7e440 R09: ffff888090f7ed08 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff88f95be0 R13: ffffed10121efd97 R14: 0000000000000001 R15: ffff888090f7ece8 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001fe0000 CR3: 0000000095a19000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held_type+0x110/0x210 kernel/locking/lockdep.c:3941 lock_is_held include/linux/lockdep.h:344 [inline] ___might_sleep+0x1f4/0x2b0 kernel/sched/core.c:6157 htable_selective_cleanup+0x22c/0x330 net/netfilter/xt_hashlimit.c:382 htable_gc+0x26/0xc0 net/netfilter/xt_hashlimit.c:392 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415