INFO: task syz-executor.2:7035 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.2 state:D stack:14520 pid: 7035 ppid: 6964 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x404/0x8a0 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_timeout+0x224/0x2d0 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 io_sq_thread_stop fs/io_uring.c:6900 [inline] io_finish_async+0x1a/0x60 fs/io_uring.c:6914 io_sq_offload_create fs/io_uring.c:7589 [inline] io_uring_create fs/io_uring.c:8665 [inline] io_uring_setup+0xa6f/0xca0 fs/io_uring.c:8738 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007f58299f8bf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000240 RCX: 000000000045d5b9 RDX: 00000000206d5000 RSI: 0000000020000240 RDI: 0000000000007e71 RBP: 000000000118cf98 R08: 0000000020000100 R09: 0000000020000100 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000206d5000 R13: 00000000206d4000 R14: 0000000020000100 R15: 0000000000000000 INFO: task io_uring-sq:7063 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:io_uring-sq state:D stack:15360 pid: 7063 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x404/0x8a0 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 kthread+0xe4/0x170 kernel/kthread.c:285 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by khungtaskd/1170: #0: ffffffff842f5dc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a kernel/locking/lockdep.c:5830 1 lock held by in:imklog/6372: #0: ffff88811f14daf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:930 3 locks held by kworker/u4:6/8312: #0: ffff88812c02dbd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x430/0x630 kernel/sched/fair.c:10555 #1: ffffffff842f5dc0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x0/0x200 kernel/sched/fair.c:5211 #2: ffff88812c01d5d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x62/0x80 kernel/time/timer.c:947 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1170 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: 8312 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:lockdep_recursion_finish kernel/locking/lockdep.c:398 [inline] RIP: 0010:lock_is_held_type+0xc4/0x120 kernel/locking/lockdep.c:5046 Code: fd ff ff 85 c0 74 d8 41 83 fe ff b9 01 00 00 00 74 0f 0f b6 43 22 31 c9 83 e0 03 44 39 f0 0f 94 c1 65 48 8b 14 25 c0 7e 01 00 <8b> 82 e4 08 00 00 83 e8 01 66 85 c0 89 82 e4 08 00 00 75 37 48 83 RSP: 0018:ffffc900025cfd00 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88810f968d90 RCX: 0000000000000000 RDX: ffff88810f968480 RSI: ffffffff842f5d40 RDI: ffff88810f968d90 RBP: ffff88810f968480 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88810f968480 R11: 30a6c5f261525aea R12: ffffffff842f5d40 R13: ffff88810f968d68 R14: 00000000ffffffff R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37a0a09000 CR3: 00000001241cb000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:267 [inline] rcu_read_lock_sched_held+0x4d/0x80 kernel/rcu/update.c:136 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