netlink: 'syz-executor6': attribute type 20 has an invalid length. INFO: rcu_sched self-detected stall on CPU 1-....: (124999 ticks this GP) idle=6ba/1/4611686018427387906 softirq=35881/35881 fqs=31233 (t=125000 jiffies g=18570 c=18569 q=626) NMI backtrace for cpu 1 CPU: 1 PID: 13303 Comm: syz-executor5 Not tainted 4.16.0-rc7+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline] rcu_dump_cpu_stacks+0x186/0x1de kernel/rcu/tree.c:1375 print_cpu_stall kernel/rcu/tree.c:1524 [inline] check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1592 __rcu_pending kernel/rcu/tree.c:3361 [inline] rcu_pending kernel/rcu/tree.c:3423 [inline] rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763 update_process_times+0x30/0x60 kernel/time/timer.c:1636 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194 __run_hrtimer kernel/time/hrtimer.c:1349 [inline] __hrtimer_run_queues+0x39c/0xec0 kernel/time/hrtimer.c:1411 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857 RIP: 0010:__write_once_size include/linux/compiler.h:215 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 kernel/kcov.c:109 RSP: 0018:ffff8801ba597680 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 RAX: 0000000000010000 RBX: ffff8801be7efe28 RCX: ffffffff82af9c6c RDX: 0000000000010000 RSI: ffffc9000425f000 RDI: ffff8801be7efe28 RBP: ffff8801ba597680 R08: ffffed0037cfdfc6 R09: ffff8801be7efe28 R10: 0000000000000001 R11: ffffed0037cfdfc5 R12: ffffffffffffffff R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000008 __bitmap_set+0x2c/0x110 lib/bitmap.c:258 bitmap_set include/linux/bitmap.h:365 [inline] __bitmap_parselist+0x310/0x4b0 lib/bitmap.c:616 bitmap_parselist+0x3a/0x50 lib/bitmap.c:628 __nodelist_parse include/linux/nodemask.h:342 [inline] update_nodemask kernel/cgroup/cpuset.c:1228 [inline] cpuset_write_resmask+0x2f7/0x2850 kernel/cgroup/cpuset.c:1727 cgroup_file_write+0x2ae/0x710 kernel/cgroup/cgroup.c:3429 kernfs_fop_write+0x2bc/0x440 fs/kernfs/file.c:316 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454889 RSP: 002b:00007f04605b9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f04605ba6d4 RCX: 0000000000454889 RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006a2 R14: 00000000006fbfd0 R15: 0000000000000000 INFO: task syz-executor4:13312 blocked for more than 120 seconds. Not tainted 4.16.0-rc7+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23760 13312 12635 0x80000002 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 schedule_timeout+0x1a3/0x230 kernel/time/timer.c:1777 do_wait_for_common kernel/sched/completion.c:86 [inline] __wait_for_common kernel/sched/completion.c:107 [inline] wait_for_common kernel/sched/completion.c:118 [inline] wait_for_completion+0x415/0x770 kernel/sched/completion.c:139 __wait_rcu_gp+0x221/0x340 kernel/rcu/update.c:414 synchronize_sched.part.64+0xac/0x100 kernel/rcu/tree.c:3212 synchronize_sched+0x76/0xf0 kernel/rcu/tree.c:3213 synchronize_rcu include/linux/rcupdate.h:94 [inline] synchronize_net+0x34/0x50 net/core/dev.c:8438 packet_release+0x897/0xce0 net/packet/af_packet.c:3023 sock_release+0x8d/0x1e0 net/socket.c:595 sock_close+0x16/0x20 net/socket.c:1149 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath+0x487/0x550 arch/x86/entry/common.c:265 ret_from_fork+0x15/0x50 arch/x86/entry/entry_64.S:399 RIP: 0033:0x457219 RSP: 002b:00007fb40e57cdb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000038 RAX: 0000000000000000 RBX: 00007fb40e57d700 RCX: 0000000000457219 RDX: 00007fb40e57d9d0 RSI: 00007fb40e57cdb0 RDI: 00000000003d0f00 RBP: 00007ffd8fa07250 R08: 00007fb40e57d700 R09: 00007fb40e57d700 R10: 00007fb40e57d9d0 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffd8fa071cf R14: 00007fb40e57d9c0 R15: 0000000000000004 Showing all locks held in the system: 2 locks held by khungtaskd/868: #0: (rcu_read_lock){....}, at: [<00000000debf672e>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000debf672e>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<0000000082f719fe>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 2 locks held by getty/4393: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4394: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4395: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4396: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4397: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4398: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4399: #0: (&tty->ldisc_sem){++++}, at: [<0000000055f74647>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e078530>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 1 lock held by syz-executor5/13314: #0: (&f->f_pos_lock){+.+.}, at: [<0000000073b7905e>] __fdget_pos+0x12b/0x190 fs/file.c:765 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 868 Comm: khungtaskd Not tainted 4.16.0-rc7+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 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:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13303 Comm: syz-executor5 Not tainted 4.16.0-rc7+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:106 RSP: 0018:ffff8801ba597680 EFLAGS: 00000246 RAX: 0000000000010000 RBX: ffffffffffffff00 RCX: ffffffff82af9cdf RDX: 000000000000ffff RSI: ffffc9000425f000 RDI: ffff8801be7efe28 RBP: ffff8801ba597680 R08: ffffed0037cfdfc6 R09: ffff8801be7efe28 R10: 0000000000000001 R11: ffffed0037cfdfc5 R12: ffffffffffffffff R13: 0000000000000000 R14: ffff8801be7efe28 R15: 0000000000000000 FS: 00007f04605ba700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b3211c000 CR3: 00000001d7175002 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __bitmap_set+0x9f/0x110 lib/bitmap.c:270 bitmap_set include/linux/bitmap.h:365 [inline] __bitmap_parselist+0x310/0x4b0 lib/bitmap.c:616 bitmap_parselist+0x3a/0x50 lib/bitmap.c:628 __nodelist_parse include/linux/nodemask.h:342 [inline] update_nodemask kernel/cgroup/cpuset.c:1228 [inline] cpuset_write_resmask+0x2f7/0x2850 kernel/cgroup/cpuset.c:1727 cgroup_file_write+0x2ae/0x710 kernel/cgroup/cgroup.c:3429 kernfs_fop_write+0x2bc/0x440 fs/kernfs/file.c:316 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454889 RSP: 002b:00007f04605b9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f04605ba6d4 RCX: 0000000000454889 RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006a2 R14: 00000000006fbfd0 R15: 0000000000000000 Code: 1c 24 90 7e 81 e2 00 01 1f 00 48 8b 4d 08 75 2b 8b 90 b8 12 00 00 83 fa 02 75 20 48 8b b0 c0 12 00 00 8b 80 bc 12 00 00 48 8b 16 <48> 83 c2 01 48 39 d0 76 07 48 89 0c d6 48 89 16 5d c3 0f 1f 00