INFO: task syz-executor.0:15349 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:29096 pid:15349 ppid: 6879 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea9/0x2230 kernel/sched/core.c:4526 schedule+0xd0/0x2a0 kernel/sched/core.c:4601 schedule_timeout+0x1d8/0x250 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+0x163/0x260 kernel/sched/completion.c:138 io_sq_thread_stop fs/io_uring.c:6906 [inline] io_finish_async fs/io_uring.c:6920 [inline] io_sq_offload_create fs/io_uring.c:7595 [inline] io_uring_create fs/io_uring.c:8671 [inline] io_uring_setup+0x1495/0x29a0 fs/io_uring.c:8744 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:00007f1776cd9bf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000045d5b9 RDX: 0000000020556000 RSI: 0000000020000040 RDI: 00000000000076d1 RBP: 000000000118d038 R08: 0000000020000100 R09: 0000000020000100 R10: 0000000020000000 R11: 0000000000000206 R12: 0000000020556000 R13: 0000000020557000 R14: 0000000020000100 R15: 0000000020000000 INFO: task syz-executor.0:15349 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29096 pid:15349 ppid: 6879 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea9/0x2230 kernel/sched/core.c:4526 schedule+0xd0/0x2a0 kernel/sched/core.c:4601 schedule_timeout+0x1d8/0x250 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+0x163/0x260 kernel/sched/completion.c:138 io_sq_thread_stop fs/io_uring.c:6906 [inline] io_finish_async fs/io_uring.c:6920 [inline] io_sq_offload_create fs/io_uring.c:7595 [inline] io_uring_create fs/io_uring.c:8671 [inline] io_uring_setup+0x1495/0x29a0 fs/io_uring.c:8744 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:00007f1776cd9bf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000045d5b9 RDX: 0000000020556000 RSI: 0000000020000040 RDI: 00000000000076d1 RBP: 000000000118d038 R08: 0000000020000100 R09: 0000000020000100 R10: 0000000020000000 R11: 0000000000000206 R12: 0000000020556000 R13: 0000000020557000 R14: 0000000020000100 R15: 0000000020000000 INFO: task io_uring-sq:15351 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:io_uring-sq state:D stack:31120 pid:15351 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea9/0x2230 kernel/sched/core.c:4526 schedule+0xd0/0x2a0 kernel/sched/core.c:4601 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660 kthread+0x2ac/0x4a0 kernel/kthread.c:285 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 4 locks held by kworker/1:1/23: #0: ffff8880ae735fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #0: ffff8880ae735fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x270/0x2230 kernel/sched/core.c:4444 #1: ffff8880ae720ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2fb/0x400 kernel/sched/psi.c:833 #2: ffff8880ae726698 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x55/0x1a0 kernel/time/timer.c:947 #3: ffff8880ae7255d8 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x5fa/0xd90 kernel/time/timer.c:1044 1 lock held by khungtaskd/1177: #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5829 3 locks held by in:imklog/6550: #0: ffff8880a911cbb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 #1: ffffffff89c5b418 (log_wait.lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:955 [inline] #1: ffffffff89c5b418 (log_wait.lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0xc7/0x41c lib/debugobjects.c:998 #2: ffff8880ae720ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2fb/0x400 kernel/sched/psi.c:833 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-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+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 296 Comm: kworker/u4:6 Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:197 Code: fe 01 00 65 8b 05 70 1b 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 4c 14 00 00 85 c0 74 2b 8b 82 28 14 00 00 <83> f8 02 75 20 48 8b 8a 30 14 00 00 8b 92 2c 14 00 00 48 8b 01 48 RSP: 0018:ffffc90001d97b90 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff87d93743 RDX: ffff8880a86cc040 RSI: ffffffff87d933f9 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c6ab9a7 R10: 0000000000000000 R11: 000000000000016e R12: ffff8880a22da09c R13: dffffc0000000000 R14: ffff88804cf14c00 R15: 000000000000030a FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f359a01b000 CR3: 0000000099974000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:694 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:772 [inline] batadv_iv_ogm_schedule_buff+0x789/0x1410 net/batman-adv/bat_iv_ogm.c:826 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:870 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:863 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x5c8/0x800 net/batman-adv/bat_iv_ogm.c:1724 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294