A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.1'. BUG: workqueue lockup - pool[ 1005.634824] INFO: task syz-executor.0:1367 blocked for more than 140 seconds. Not tainted 4.9.203-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D 28920 1367 26146 0x00000004 0000000000000087 ffff880189c297c0 ffff8801c9658b00 ffff8801db61ffc0 ffff8801d0fa17c0 ffff8801db61ffd8 ffff88018ea77a30 ffffffff8280a79e ffff88018ea77980 ffffffff8120d305 0000000000000292 ffff8801db6208b0 Call Trace: [<0000000013e53f04>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<0000000041d9f746>] _synchronize_rcu_expedited+0x593/0x850 kernel/rcu/tree_exp.h:588 [<0000000009113779>] synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline] [<0000000009113779>] synchronize_rcu_expedited+0x22/0x30 kernel/rcu/tree_exp.h:681 [<0000000020a54de8>] synchronize_net+0x2f/0x50 net/core/dev.c:7867 [<0000000006600fa6>] packet_release+0x703/0xb90 net/packet/af_packet.c:3071 [<00000000245efe94>] __sock_release+0xd3/0x2c0 net/socket.c:605 [<000000002dd0bc4c>] sock_close+0x1b/0x30 net/socket.c:1060 [<00000000b8a48c50>] __fput+0x274/0x720 fs/file_table.c:208 [<00000000a5375a9e>] ____fput+0x16/0x20 fs/file_table.c:244 [<00000000a0524f48>] task_work_run+0x108/0x180 kernel/task_work.c:116 [<0000000029e4cc1e>] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [<0000000029e4cc1e>] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163 [<000000008114c206>] prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] [<000000008114c206>] syscall_return_slowpath arch/x86/entry/common.c:266 [inline] [<000000008114c206>] do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293 [<00000000e211520f>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: ( rcu_read_lock ){......} , at: [<0000000034d9f435>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] , at: [<0000000034d9f435>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: ( tasklist_lock ){.+.+..} , at: [<00000000b8bd009e>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1897: #0: ( &f->f_pos_lock ){+.+.+.} , at: [<00000000e96f7af2>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2024: #0: ( &tty->ldisc_sem ){++++++} , at: [<0000000048ffa4c2>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: ( &ldata->atomic_read_lock ){+.+...} , at: [<000000002c7d6123>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.0/1367: #0: ( &sb->s_type->i_mutex_key #8 ){+.+.+.} , at: [<00000000dbf23115>] inode_lock include/linux/fs.h:771 [inline] , at: [<00000000dbf23115>] __sock_release+0x89/0x2c0 net/socket.c:604 #1: ( rcu_preempt_state.exp_mutex ){+.+...} , at: [<00000000e7982b80>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline] , at: [<00000000e7982b80>] _synchronize_rcu_expedited+0x339/0x850 kernel/rcu/tree_exp.h:569 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.203-syzkaller #0 ffff8801d98d7cc8 ffffffff81b55f6b 0000000000000001 0000000000000000 0000000000000001 ffffffff8109a001 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6120c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<0000000016d0d4bc>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000016d0d4bc>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<000000008a1c7242>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000378bb71a>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000057f20324>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000006a86797f>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000006a86797f>] check_hung_task kernel/hung_task.c:126 [inline] [<000000006a86797f>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000006a86797f>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000005b0174cb>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000ec9ab176>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 17727 Comm: kworker/0:0 Not tainted 4.9.203-syzkaller #0 Workqueue: events rtc_timer_do_workc task: 000000000886663f task.stack: 000000004307e5c5 RIP: 0010:[] c [<0000000000557f1d>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414 RSP: 0000:ffff8801db6077c0 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81d75c51 RDI: ffffffff84b66d98 RBP: ffff8801db6077d0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff841d562a R12: ffffffff84b66d60 R13: 0000000000000020 R14: fffffbfff096cdf3 R15: fffffbfff096cdb5 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f75ae569140 CR3: 00000001d0f03000 CR4: 00000000001606b0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff84b66d60c 000000000000270bc ffff8801db607820c ffffffff81d77ef4c 000000000001ffc0c ffffffff84b66da8c ffffffff84b66f9ac ffffffff841d560ec ffffffff84b66d60c 000000000000005dc dffffc0000000000c 000000000000005dc Call Trace: d [<00000000380a6f16>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] d [<00000000380a6f16>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<000000008b613fff>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<000000003fe1c3c6>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885 [<00000000aaa14b5a>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<000000002f1632d6>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<000000006de3e856>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1552 [<000000009d406028>] console_cont_flush kernel/printk/printk.c:2277 [inline] [<000000009d406028>] console_unlock+0x17d/0xb40 kernel/printk/printk.c:2343 [<00000000a8156621>] vprintk_emit+0x43f/0x6f0 kernel/printk/printk.c:1866 [<00000000920abc14>] vprintk+0x28/0x30 kernel/printk/printk.c:1876 [<00000000f4ca06c9>] vprintk_func kernel/printk/internal.h:36 [inline] [<00000000f4ca06c9>] printk+0xc2/0xf5 kernel/printk/printk.c:1938 [<00000000e0bc2740>] wq_watchdog_timer_fn.cold+0x11/0x66 kernel/workqueue.c:5432 [<00000000caff71af>] call_timer_fn+0x167/0x6d0 kernel/time/timer.c:1319 [<000000001c530eb2>] expire_timers+0x25b/0x5c0 kernel/time/timer.c:1359 [<00000000db19767c>] __run_timers kernel/time/timer.c:1676 [inline] [<00000000db19767c>] run_timer_softirq+0x404/0x620 kernel/time/timer.c:1691 [<0000000080643123>] __do_softirq+0x22d/0x964 kernel/softirq.c:288 [<0000000044c9c39d>] invoke_softirq kernel/softirq.c:368 [inline] [<0000000044c9c39d>] irq_exit+0x119/0x160 kernel/softirq.c:409 [<000000005c3abb2c>] exiting_irq arch/x86/include/asm/apic.h:669 [inline] [<000000005c3abb2c>] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:1000 [<00000000fbe19ad6>] apic_timer_interrupt+0xa5/0xb0 arch/x86/entry/entry_64.S:653 d [<00000000578b185e>] ? rtc_aie_update_irq+0x30/0x30 drivers/rtc/interface.c:538 [<000000006acf428a>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline] [<000000006acf428a>] rtc_handle_legacy_irq+0x81/0x190 drivers/rtc/interface.c:515 [<00000000b3a34baa>] rtc_uie_update_irq+0x20/0x30 drivers/rtc/interface.c:550 [<000000003dcc2cc1>] rtc_timer_do_work+0x1fe/0x600 drivers/rtc/interface.c:881 [<0000000061715397>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114 [<0000000053fd5a72>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251 [<000000005b0174cb>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000ec9ab176>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Code: c24 cc9 c00 c00 c00 c49 c8d c7c c24 c38 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 cd3 ce3 c80 c3c c02 c00 c75 c17 c41 c03 c5c c24 c38 c89 cda cec c<5b> c0f cb6 cc0 c41 c5c c5d cc3 ce8 ce8 c8a c78 cff ceb cc2 ce8 c41 c8b c78 cff ceb c