INFO: task kworker/u4:0:7 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:0 state:D stack:12104 pid: 7 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_timeout+0x266/0x350 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0xa7/0x110 kernel/sched/completion.c:138 __synchronize_srcu+0xcf/0x170 kernel/rcu/srcutree.c:935 fsnotify_mark_destroy_workfn+0x74/0xf0 fs/notify/mark.c:836 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/u4:5:8339 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack:12432 pid: 8339 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_timeout+0x266/0x350 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0xa7/0x110 kernel/sched/completion.c:138 __synchronize_srcu+0xcf/0x170 kernel/rcu/srcutree.c:935 fsnotify_connector_destroy_workfn+0x3f/0x70 fs/notify/mark.c:164 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.1:5955 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:13704 pid: 5955 ppid: 6972 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 __lock_sock+0x92/0x100 net/core/sock.c:2504 lock_sock_nested+0x86/0x90 net/core/sock.c:3036 lock_sock include/net/sock.h:1583 [inline] sk_stream_wait_memory+0x19d/0x360 net/core/stream.c:145 mptcp_sendmsg+0x114/0x5b0 net/mptcp/protocol.c:1107 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 Code: Bad RIP value. RSP: 002b:00007f5280886c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000002e880 RCX: 000000000045dd99 RDX: 00000000ffffffe7 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000118bf78 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000c000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffc443c4bcf R14: 00007f52808879c0 R15: 000000000118bf2c Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: ffff88812bc57938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812bc57938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812bc57938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc90000ca3e70 ((reaper_work).work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90000ca3e70 ((reaper_work).work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90000ca3e70 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 1 lock held by khungtaskd/1148: #0: ffffffff845192a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a kernel/locking/lockdep.c:5830 4 locks held by kworker/0:3/3932: 1 lock held by in:imklog/6367: #0: ffff888122c48ef0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:930 2 locks held by kworker/u4:5/8339: #0: ffff88812bc57938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812bc57938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812bc57938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc90002d7fe70 (connector_reaper_work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90002d7fe70 (connector_reaper_work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90002d7fe70 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1148 Comm: khungtaskd Not tainted 5.9.0-rc3-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+0xa3/0xcc lib/dump_stack.c:118 nmi_cpu_backtrace.cold.8+0x3e/0x58 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xd5/0xec lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x58e/0x680 kernel/hung_task.c:295 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8368 Comm: kworker/u4:6 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_preemption_disabled+0x2/0xd0 lib/smp_processor_id.c:13 Code: ec 20 75 01 85 c9 74 03 31 c0 c3 8b 15 47 ed 2a 01 b8 01 00 00 00 85 d2 74 0a c7 05 34 ed 2a 01 0f 00 00 00 c3 cc cc cc 41 55 <41> 54 55 53 65 8b 1d 63 a0 da 7c 65 8b 05 7c 0b db 7c a9 ff ff ff RSP: 0018:ffffc90002dc7d08 EFLAGS: 00000282 RAX: 0000000000000001 RBX: ffffc90002dc7d47 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff842613ce RDI: ffffffff84094c35 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88810ee48580 R11: 1853f4cb28d6180c R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff845192a0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f991d877028 CR3: 000000011feba000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:326 [inline] rcu_is_watching+0x11/0x70 kernel/rcu/tree.c:1111 rcu_read_lock_held_common+0x1c/0x40 kernel/rcu/update.c:119 rcu_read_lock_sched_held+0x1e/0x80 kernel/rcu/update.c:134 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x362/0x3e0 kernel/locking/lockdep.c:4980 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] batadv_nc_process_nc_paths.part.18+0x62/0x180 net/batman-adv/network-coding.c:686 batadv_nc_process_nc_paths net/batman-adv/network-coding.c:678 [inline] batadv_nc_worker+0x22c/0x240 net/batman-adv/network-coding.c:727 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294