INFO: task syz-executor.5:29343 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. syz-executor.5 D26208 29343 8317 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 caif:caif_disconnect_client(): nothing to disconnect schedule+0x8d/0x1b0 kernel/sched/core.c:3561 audit: type=1326 audit(1668406197.524:150): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5935 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7ff5aa1a4639 code=0x0 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 audit: type=1326 audit(1668406197.724:151): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5955 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f971c26b639 code=0x0 audit: type=1326 audit(1668406197.774:152): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5956 comm="syz-executor.5" exe="/root/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f49e56cc639 code=0x0 __flush_work+0x4bb/0x8b0 kernel/workqueue.c:2926 __cancel_work_timer+0x412/0x590 kernel/workqueue.c:3013 p9_conn_destroy net/9p/trans_fd.c:904 [inline] p9_fd_close+0x305/0x520 net/9p/trans_fd.c:934 p9_client_create+0x901/0x12e0 net/9p/client.c:1084 v9fs_session_init+0x1dd/0x1770 fs/9p/v9fs.c:421 v9fs_mount+0x73/0x910 fs/9p/vfs_super.c:135 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8394d5d639 Code: Bad RIP value. RSP: 002b:00007f83932d0168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8394e7df80 RCX: 00007f8394d5d639 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00007f8394db8ae9 R08: 0000000020000180 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcd7dad36f R14: 00007f83932d0300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 0000000014c6526f (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 3 locks held by kworker/u4:4/3610: 1 lock held by in:imklog/7806: #0: 00000000611ca1f9 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.4/8180: #0: 00000000eef583ea (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000eef583ea (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 3 locks held by kworker/u4:7/21438: #0: 00000000c275489e ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000be030620 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000a2d0f90c (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 2 locks held by kworker/1:5/28870: #0: 00000000801aae9d ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000cea6695b ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 2 locks held by kworker/1:18/31201: #0: 000000008c188351 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000422ce186 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 4 locks held by syz-executor.1/5945: #0: 000000007598e001 (&mousedev->mutex/1){+.+.}, at: mixdev_close_devices+0x21/0x1f0 drivers/input/mousedev.c:489 #1: 000000005ee76548 (&mousedev->mutex#2){+.+.}, at: mousedev_close_device drivers/input/mousedev.c:444 [inline] #1: 000000005ee76548 (&mousedev->mutex#2){+.+.}, at: mixdev_close_devices+0x111/0x1f0 drivers/input/mousedev.c:497 #2: 00000000693f86c8 (&dev->mutex#2){+.+.}, at: input_close_device+0x42/0x150 drivers/input/input.c:658 #3: 0000000007fa3a9b (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #3: 0000000007fa3a9b (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 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: 18 Comm: ksoftirqd/1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:siprand_u32 lib/random32.c:366 [inline] RIP: 0010:prandom_u32+0x143/0x1f0 lib/random32.c:380 Code: 48 31 c8 48 c1 c1 20 49 31 d4 48 01 c2 48 c1 c0 11 4c 01 e1 49 c1 c4 15 48 31 d0 49 31 cc 48 c1 c2 20 48 89 4d 00 4c 89 65 18 <41> 01 c4 48 89 45 08 48 89 55 10 bf 01 00 00 00 e8 08 14 ce fd 65 RSP: 0018:ffff8880b5acfba0 EFLAGS: 00000202 RAX: f832dc83eb4eba55 RBX: eb735f8ab6eb54aa RCX: 6abd07d2c306b4ce RDX: 69db4f698663959e RSI: 1ffff110174251ab RDI: ffff8880ba128d58 RBP: ffff8880ba128d40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 443781d2a3459a76 R13: 1ffff11016b59f80 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f02be5c6000 CR3: 00000000a1960000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: garp_join_timer_arm+0x21/0x80 net/802/garp.c:413 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 run_ksoftirqd+0x57/0x110 kernel/softirq.c:653 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:164 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415