INFO: task khugepaged:1651 blocked for more than 143 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:khugepaged state:D stack:23968 pid: 1651 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 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+0x168/0x270 kernel/sched/completion.c:138 __flush_work+0x527/0xac0 kernel/workqueue.c:3052 __lru_add_drain_all+0x3fd/0x760 mm/swap.c:842 khugepaged_do_scan mm/khugepaged.c:2202 [inline] khugepaged+0x10f/0x5530 mm/khugepaged.c:2263 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/u4:8:11265 blocked for more than 143 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:8 state:D stack:24224 pid:11265 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 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+0x168/0x270 kernel/sched/completion.c:138 __synchronize_srcu+0x1a6/0x280 kernel/rcu/srcutree.c:935 fsnotify_mark_destroy_workfn+0xfd/0x340 fs/notify/mark.c:832 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/u4:1:22540 blocked for more than 144 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:1 state:D stack:24888 pid:22540 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 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+0x168/0x270 kernel/sched/completion.c:138 __synchronize_srcu+0x1a6/0x280 kernel/rcu/srcutree.c:935 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:164 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.1:13048 blocked for more than 144 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27960 pid:13048 ppid: 10539 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 synchronize_rcu_expedited+0x453/0x620 kernel/rcu/tree_exp.h:853 synchronize_rcu+0xdf/0x180 kernel/rcu/tree.c:3787 account_event kernel/events/core.c:11393 [inline] perf_event_alloc.part.0+0x33d4/0x3b50 kernel/events/core.c:11618 perf_event_alloc kernel/events/core.c:11938 [inline] __do_sys_perf_event_open+0x4ad/0x2df0 kernel/events/core.c:12036 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f84a3ff6188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffd3abe0ff R14: 00007f84a3ff6300 R15: 0000000000022000 INFO: task syz-executor.2:13047 blocked for more than 145 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27960 pid:13047 ppid: 23875 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 account_event kernel/events/core.c:11385 [inline] perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 perf_event_alloc kernel/events/core.c:11938 [inline] __do_sys_perf_event_open+0x4ad/0x2df0 kernel/events/core.c:12036 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f6f460ea188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc6b40348f R14: 00007f6f460ea300 R15: 0000000000022000 INFO: task syz-executor.4:13055 blocked for more than 146 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27944 pid:13055 ppid: 8478 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 account_event kernel/events/core.c:11385 [inline] perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 perf_event_alloc kernel/events/core.c:11938 [inline] __do_sys_perf_event_open+0x4ad/0x2df0 kernel/events/core.c:12036 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f5dc07e7188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 00000000004665d9 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffc028bb2af R14: 00007f5dc07e7300 R15: 0000000000022000 INFO: task syz-executor.5:13049 blocked for more than 146 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27960 pid:13049 ppid: 20434 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 account_event kernel/events/core.c:11385 [inline] perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 perf_event_alloc kernel/events/core.c:11938 [inline] __do_sys_perf_event_open+0x4ad/0x2df0 kernel/events/core.c:12036 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f718f3a5188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffed0606d6f R14: 00007f718f3a5300 R15: 0000000000022000 INFO: task syz-executor.3:13056 blocked for more than 147 seconds. Not tainted 5.12.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27960 pid:13056 ppid: 8437 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 account_event kernel/events/core.c:11385 [inline] perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 perf_event_alloc kernel/events/core.c:11938 [inline] __do_sys_perf_event_open+0x4ad/0x2df0 kernel/events/core.c:12036 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f2d025f0188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 00000000004665d9 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056c008 R13: 00007fffa6ad21ff R14: 00007f2d025f0300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1618: #0: ffffffff8bf79760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333 1 lock held by khugepaged/1651: #0: ffffffff8c05a688 (lock#5){+.+.}-{3:3}, at: __lru_add_drain_all+0x65/0x760 mm/swap.c:791 1 lock held by in:imklog/8132: #0: ffff8880170f74f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 2 locks held by kworker/u4:8/11265: #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246 #1: ffffc90001eb7da8 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250 7 locks held by kworker/u4:21/11354: 2 locks held by kworker/u4:1/22540: #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246 #1: ffffc90001d87da8 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250 5 locks held by kworker/u4:4/12549: 3 locks held by kworker/0:2/10811: 5 locks held by kworker/1:1/11359: 2 locks held by syz-executor.1/13048: #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11385 [inline] #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 #1: ffffffff8bf82968 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8bf82968 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4fa/0x620 kernel/rcu/tree_exp.h:837 1 lock held by syz-executor.2/13047: #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11385 [inline] #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 1 lock held by syz-executor.4/13055: #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11385 [inline] #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 1 lock held by syz-executor.5/13049: #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11385 [inline] #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 1 lock held by syz-executor.3/13056: #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11385 [inline] #0: ffffffff8c042da8 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x3262/0x3b50 kernel/events/core.c:11618 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1618 Comm: khungtaskd Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:313 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: 4853 Comm: systemd-journal Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x559426828a40 Code: b6 a3 00 00 48 8d 15 3f 69 00 00 b9 b0 01 00 00 44 89 f6 bf 03 00 00 00 31 c0 e8 6b 65 ff ff e9 16 f6 ff ff 66 0f 1f 44 00 00 <41> 57 41 56 41 55 41 54 55 53 48 81 ec 88 00 00 00 64 48 8b 04 25 RSP: 002b:00007fff4fe8f2e8 EFLAGS: 00000246 RAX: 00000000fffffffe RBX: 00007fff4fe92250 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fff4fe92250 RBP: 00007fff4fe8f370 R08: 00005594268273e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00005594274cd8a0 R15: 00007fff4fe8f860 FS: 00007f6bbadc88c0 GS: 0000000000000000