netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. IPVS: ftp: loaded support on port[0] = 21 INFO: task kworker/u4:1:19422 blocked for more than 140 seconds. Not tainted 4.19.122-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D25872 19422 2 0x80000000 Workqueue: netns cleanup_net Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21b/0x3c0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x45/0xb0 kernel/locking/rwsem.c:26 cleanup_net+0xa8/0x850 net/core/net_namespace.c:520 process_one_work+0x91f/0x1640 kernel/workqueue.c:2155 worker_thread+0x96/0xe20 kernel/workqueue.c:2298 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.0:958 blocked for more than 140 seconds. Not tainted 4.19.122-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28416 958 6436 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 unregister_netdevice_notifier+0x75/0x320 net/core/dev.c:1712 raw_release+0x53/0x6c0 net/can/raw.c:358 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2cd/0x890 fs/file_table.c:278 task_work_run+0x13f/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x25a/0x2b0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416421 Code: Bad RIP value. RSP: 002b:00007ffe499eddd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416421 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000791558 R09: 0000000000000000 R10: 00007ffe499edeb0 R11: 0000000000000293 R12: 0000000000791560 R13: 0000000000000000 R14: ffffffffffffffff R15: 000000000078bf0c Showing all locks held in the system: 1 lock held by khungtaskd/1079: #0: 0000000012542bb0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by systemd-journal/3678: 2 locks held by syz-fuzzer/6416: 2 locks held by kworker/u4:0/26425: 3 locks held by kworker/1:1/27902: #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000004e6be00a ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2126 #1: 00000000cdc2fc4f ((addr_chk_work).work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2130 #2: 000000002808175e (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475 3 locks held by kworker/u4:1/19422: #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000c57d1346 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2126 #1: 00000000c9201e94 (net_cleanup_work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2130 #2: 0000000079866836 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x850 net/core/net_namespace.c:520 1 lock held by syz-executor.5/20314: 1 lock held by syz-executor.5/30214: 2 locks held by syz-executor.0/958: #0: 0000000010554542 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000010554542 (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578 #1: 0000000079866836 (pernet_ops_rwsem){++++}, at: unregister_netdevice_notifier+0x75/0x320 net/core/dev.c:1712 3 locks held by syz-executor.0/976: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1079 Comm: khungtaskd Not tainted 4.19.122-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x962/0xe40 kernel/hung_task.c:287 kthread+0x34a/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: 976 Comm: syz-executor.0 Not tainted 4.19.122-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x20/0x4f0 kernel/locking/lockdep.c:3476 Code: e9 1b ff ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 41 54 55 53 48 89 fb 48 83 c7 10 48 89 fa 48 83 ec 08 <48> c1 ea 03 80 3c 02 00 0f 85 e2 03 00 00 48 39 73 10 0f 84 f9 01 RSP: 0000:ffff8880ae607d80 EFLAGS: 00000082 RAX: dffffc0000000000 RBX: ffff88804bfbcfc0 RCX: ffffffff81595beb RDX: ffff88804bfbcfd0 RSI: ffff8880ae625b98 RDI: ffff88804bfbcfd0 RBP: ffff8880ae625b98 R08: ffff88804bfbc6c0 R09: ffffffff8ad01008 R10: ffffffff8ad01010 R11: 0000000000000001 R12: ffffed10097f79e8 R13: ffff88804bfbcf48 R14: ffff88804bfbcfc0 R15: 0000000000000003 FS: 00007f8b9ed90700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002262d7c8 CR3: 00000001f91b7000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held+0xad/0x140 kernel/locking/lockdep.c:3727 lock_is_held_type+0x10d/0x210 kernel/locking/lockdep.c:3945 lock_is_held include/linux/lockdep.h:344 [inline] __run_hrtimer kernel/time/hrtimer.c:1369 [inline] __hrtimer_run_queues+0x4d6/0xd50 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:qlink_free mm/kasan/quarantine.c:150 [inline] RIP: 0010:qlist_free_all+0xfc/0x140 mm/kasan/quarantine.c:166 Code: 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 4c 8b 70 18 e9 40 ff ff ff e8 63 1a cf ff 48 83 3d 63 94 34 07 00 74 36 4c 89 ff 57 9d <0f> 1f 44 00 00 4d 85 e4 75 9e 49 c7 45 08 00 00 00 00 49 c7 45 00 RSP: 0000:ffff888203f875d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff88800e2a48c0 RCX: 1ffff110097f79f2 RDX: 0000000000000000 RSI: ffff88804bfbcf98 RDI: 0000000000000282 RBP: 0000000000000000 R08: ffff88804bfbc6c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88800e2a47e0 R13: ffff888203f87608 R14: ffff88812c2f7240 R15: 0000000000000282 quarantine_reduce+0x164/0x1a0 mm/kasan/quarantine.c:259 kasan_kmalloc+0x95/0xe0 mm/kasan/kasan.c:538 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc_track_caller+0x153/0x770 mm/slab.c:3742 kstrdup+0x36/0x70 mm/util.c:56 kstrdup_const+0x53/0x80 mm/util.c:77 __kernfs_new_node+0x9b/0x680 fs/kernfs/dir.c:629 kernfs_new_node+0x92/0x120 fs/kernfs/dir.c:693 kernfs_create_dir_ns+0x48/0x150 fs/kernfs/dir.c:1019 sysfs_create_dir_ns+0x127/0x280 fs/sysfs/dir.c:58 create_dir lib/kobject.c:88 [inline] kobject_add_internal+0x29d/0x8c0 lib/kobject.c:247 kobject_add_varg lib/kobject.c:382 [inline] kobject_init_and_add+0x101/0x160 lib/kobject.c:453 netdev_queue_add_kobject net/core/net-sysfs.c:1481 [inline] netdev_queue_update_kobjects+0x11e/0x3c0 net/core/net-sysfs.c:1509 register_queue_kobjects net/core/net-sysfs.c:1551 [inline] netdev_register_kobject+0x29b/0x3b0 net/core/net-sysfs.c:1769 register_netdevice+0x7f7/0xf50 net/core/dev.c:8710 register_netdev+0x2d/0x50 net/core/dev.c:8832 loopback_net_init+0x73/0x160 drivers/net/loopback.c:218 ops_init+0xaf/0x410 net/core/net_namespace.c:129 setup_net+0x2c2/0x6f0 net/core/net_namespace.c:315 copy_net_ns+0x1d9/0x331 net/core/net_namespace.c:438 create_new_namespaces+0x3fb/0x7c0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x439/0x8d0 kernel/fork.c:2530 __do_sys_unshare kernel/fork.c:2598 [inline] __se_sys_unshare kernel/fork.c:2596 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2596 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8b9ed8fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000509f60 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c4e R14: 00000000004ce7bd R15: 00007f8b9ed906d4