audit: type=1800 audit(1670200168.922:597): pid=9559 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14851 res=0 audit: type=1800 audit(1670200168.942:598): pid=9555 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14851 res=0 INFO: task kworker/u4:8:9675 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:8 D25728 9675 2 0x80000000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 flush_workqueue+0x40b/0x13e0 kernel/workqueue.c:2713 Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable flush_scheduled_work include/linux/workqueue.h:599 [inline] tipc_exit_net+0x38/0x60 net/tipc/core.c:100 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1569: IPVS: ftp: loaded support on port[0] = 21 #0: 00000000e1e89c9e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7828: #0: 0000000069d78dc0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/0:3/8544: #0: 00000000254694c8 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000f3d1a042 ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 3 locks held by kworker/u4:6/9577: 3 locks held by kworker/u4:8/9675: #0: 00000000206ba74e ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000f48cb103 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000d2c95bc8 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 1 lock held by syz-executor.4/9554: 3 locks held by syz-executor.0/9638: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9554 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:preempt_count_sub+0x37/0x150 kernel/sched/core.c:3262 Code: 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 ef 00 00 00 8b 0d 59 ca e2 0b <85> c9 75 18 65 8b 05 3e 72 c0 7e 25 ff ff ff 7f 39 c3 7f 1a 81 fb RSP: 0018:ffff8880ba107d70 EFLAGS: 00000097 RAX: 0000000000000003 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff83771e31 RDI: 0000000000000001 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: ffffffff8c66505b R12: ffffffff89f88280 R13: ffffffff89f88280 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fc33a8bb700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fce38800000 CR3: 0000000099ac2000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1081 [inline] rcu_lockdep_current_cpu_online+0x12f/0x1b0 kernel/rcu/tree.c:1068 rcu_read_lock_sched_held+0xd3/0x1d0 kernel/rcu/update.c:115 trace_hrtimer_start include/trace/events/timer.h:191 [inline] debug_activate kernel/time/hrtimer.c:466 [inline] enqueue_hrtimer+0x322/0x3d0 kernel/time/hrtimer.c:972 __run_hrtimer kernel/time/hrtimer.c:1480 [inline] __hrtimer_run_queues+0xae6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:unwind_get_return_address arch/x86/kernel/unwind_orc.c:297 [inline] RIP: 0010:unwind_get_return_address+0x31/0x90 arch/x86/kernel/unwind_orc.c:292 Code: fc ff df 48 89 fa 55 48 c1 ea 03 53 48 89 fb 0f b6 04 02 84 c0 74 04 3c 03 7e 51 8b 03 85 c0 75 05 5b 31 c0 5d c3 48 8d 6b 48 <48> b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 75 RSP: 0018:ffff88803d6a75a8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff88803d6a75d0 RCX: 0000000000000000 RDX: 1ffff11007ad4eba RSI: ffff88803d6a7430 RDI: ffff88803d6a75d0 RBP: ffff88803d6a7618 R08: 0000000000000001 R09: 0000000000000001 R10: ffff88803d6a762f R11: 0000000000074071 R12: ffff88803d6a7668 R13: 0000000000000000 R14: ffff88813bff0dc0 R15: 0000000000001000 __save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc_track_caller+0x13f/0x3c0 mm/slab.c:3742 kmemdup+0x23/0x50 mm/util.c:118 kmemdup include/linux/string.h:450 [inline] __devinet_sysctl_register+0x98/0x280 net/ipv4/devinet.c:2332 devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2384 inetdev_init+0x223/0x4a0 net/ipv4/devinet.c:269 inetdev_event+0x9cf/0x1270 net/ipv4/devinet.c:1477 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 call_netdevice_notifiers net/core/dev.c:1762 [inline] register_netdevice+0xdd2/0x10f0 net/core/dev.c:8761 register_netdev+0x2d/0x50 net/core/dev.c:8859 loopback_net_init+0x73/0x160 drivers/net/loopback.c:218 ops_init+0xb3/0x410 net/core/net_namespace.c:129 setup_net+0x2c2/0x720 net/core/net_namespace.c:316 copy_net_ns+0x1f7/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2542 __do_sys_unshare kernel/fork.c:2610 [inline] __se_sys_unshare kernel/fork.c:2608 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2608 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fc33c3490d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc33a8bb168 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fc33c468f80 RCX: 00007fc33c3490d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00007fc33c3a4ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0f262bdf R14: 00007fc33a8bb300 R15: 0000000000022000