INFO: task hung in __drain_all

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in __drain_all_pages (2) mm	C	unreliable	unreliable	4	893d	997d	0/26	closed as invalid on 2022/02/08 10:25

INFO: task khugepaged:1664 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:khugepaged state:D stack:23832 pid: 1664 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1854 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 __flush_work+0x51f/0xac0 kernel/workqueue.c:3052 __drain_all_pages+0x436/0x670 mm/page_alloc.c:3121 drain_all_pages mm/page_alloc.c:3135 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4411 [inline] __alloc_pages_slowpath.constprop.0+0x94b/0x2240 mm/page_alloc.c:4801 __alloc_pages_nodemask+0x5f0/0x730 mm/page_alloc.c:5011 __alloc_pages include/linux/gfp.h:511 [inline] __alloc_pages_node include/linux/gfp.h:524 [inline] khugepaged_alloc_page+0xa0/0x170 mm/khugepaged.c:872 collapse_huge_page mm/khugepaged.c:1076 [inline] khugepaged_scan_pmd mm/khugepaged.c:1366 [inline] khugepaged_scan_mm_slot mm/khugepaged.c:2135 [inline] khugepaged_do_scan mm/khugepaged.c:2218 [inline] khugepaged+0x3233/0x54d0 mm/khugepaged.c:2263 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task syz-executor.0:8503 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:23136 pid: 8503 ppid: 1 flags:0x20000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 synchronize_rcu_expedited+0x44b/0x610 kernel/rcu/tree_exp.h:852 synchronize_rcu+0xdf/0x180 kernel/rcu/tree.c:3690 xt_replace_table+0x304/0x600 net/netfilter/x_tables.c:1389 __do_replace+0x1d7/0x8c0 net/ipv6/netfilter/ip6_tables.c:1083 compat_do_replace net/ipv4/netfilter/arp_tables.c:1280 [inline] do_arpt_set_ctl+0xbe7/0xea0 net/ipv4/netfilter/arp_tables.c:1415 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x3c3/0x3a20 net/ipv4/ip_sockglue.c:1435 tcp_setsockopt+0x136/0x2440 net/ipv4/tcp.c:3597 __sys_setsockopt+0x2db/0x610 net/socket.c:2115 __do_compat_sys_socketcall+0x4ef/0x660 net/compat.c:492 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fd4549 RSP: 002b:00000000090bf6c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000e RCX: 00000000090bf6dc RDX: 00000000090bf83c RSI: 0000000000000003 RDI: 00000000090bfd8c RBP: 00000000090bf720 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.1:8534 blocked for more than 145 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:23640 pid: 8534 ppid: 1 flags:0x20000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 do_arpt_get_ctl+0x456/0x8f0 net/ipv4/netfilter/arp_tables.c:1441 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4141 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156 __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fd7549 RSP: 002b:00000000090bf6c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00000000090bf6dc RDX: 0000000000000003 RSI: 0000000000000003 RDI: 00000000090bf768 RBP: 00000000090bf720 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.2:8652 blocked for more than 145 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23640 pid: 8652 ppid: 1 flags:0x20000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 do_arpt_get_ctl+0x456/0x8f0 net/ipv4/netfilter/arp_tables.c:1441 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4141 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156 __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f3b549 RSP: 002b:00000000090bf6c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00000000090bf6dc RDX: 0000000000000003 RSI: 0000000000000003 RDI: 00000000090bf768 RBP: 00000000090bf720 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.3:8782 blocked for more than 146 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:23640 pid: 8782 ppid: 1 flags:0x20000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 do_arpt_get_ctl+0x456/0x8f0 net/ipv4/netfilter/arp_tables.c:1441 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4141 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156 __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f72549 RSP: 002b:00000000090bf6c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00000000090bf6dc RDX: 0000000000000003 RSI: 0000000000000003 RDI: 00000000090bf768 RBP: 00000000090bf720 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:8825 blocked for more than 146 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23568 pid: 8825 ppid: 1 flags:0x20000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 xt_request_find_table_lock+0x27/0xf0 net/netfilter/x_tables.c:1253 get_info+0x178/0x720 net/ipv4/netfilter/arp_tables.c:807 do_arpt_get_ctl+0x456/0x8f0 net/ipv4/netfilter/arp_tables.c:1441 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4141 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156 __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f75549 RSP: 002b:00000000090bf6c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00000000090bf6dc RDX: 0000000000000003 RSI: 0000000000000003 RDI: 00000000090bf768 RBP: 00000000090bf720 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.5:8993 blocked for more than 147 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:23080 pid: 8993 ppid: 1 flags:0x20000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 do_arpt_get_ctl+0x456/0x8f0 net/ipv4/netfilter/arp_tables.c:1441 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4141 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156 __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f3d549 RSP: 002b:00000000090bf6c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00000000090bf6dc RDX: 0000000000000003 RSI: 0000000000000003 RDI: 00000000090bf768 RBP: 00000000090bf720 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task kworker/u4:17:11862 blocked for more than 148 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:17 state:D stack:25640 pid:11862 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1854 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 __synchronize_srcu+0x132/0x220 kernel/rcu/srcutree.c:924 fsnotify_mark_destroy_workfn+0xfd/0x340 fs/notify/mark.c:836 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task kworker/u4:18:11863 blocked for more than 148 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:18 state:D stack:26248 pid:11863 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1854 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 __synchronize_srcu+0x132/0x220 kernel/rcu/srcutree.c:924 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:164 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Showing all locks held in the system: 3 locks held by kworker/1:1/34: 2 locks held by kworker/u4:3/81: 1 lock held by khungtaskd/1657: #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by khugepaged/1664: #0: ffffffff8b489528 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4f/0x670 mm/page_alloc.c:3070 3 locks held by kworker/0:4/4896: 1 lock held by in:imklog/8176: #0: ffff8880238e8ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by syz-executor.0/8503: #0: ffff8881475f8458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 #1: ffffffff8b37c1e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8b37c1e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f2/0x610 kernel/rcu/tree_exp.h:836 1 lock held by syz-executor.1/8534: #0: ffff8881475f8508 (&xt[i].compat_mutex){+.+.}-{3:3}, at: get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 1 lock held by syz-executor.2/8652: #0: ffff8881475f8508 (&xt[i].compat_mutex){+.+.}-{3:3}, at: get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 1 lock held by syz-executor.3/8782: #0: ffff8881475f8508 (&xt[i].compat_mutex){+.+.}-{3:3}, at: get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 2 locks held by syz-executor.4/8825: #0: ffff8881475f8508 (&xt[i].compat_mutex){+.+.}-{3:3}, at: get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 #1: ffff8881475f8458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 1 lock held by syz-executor.5/8993: #0: ffff8881475f8508 (&xt[i].compat_mutex){+.+.}-{3:3}, at: get_info+0x163/0x720 net/ipv4/netfilter/arp_tables.c:805 2 locks held by kworker/u4:17/11862: #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246 #1: ffffc90016e97da8 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 2 locks held by kworker/u4:18/11863: #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246 #1: ffffc90016e47da8 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1657 Comm: khungtaskd Not tainted 5.11.0-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:79 [inline] dump_stack+0x107/0x163 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+0xd43/0xfa0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 34 Comm: kworker/1:1 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events prog_array_map_clear_deferred RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:319 [inline] RIP: 0010:rcu_is_watching+0x3d/0xc0 kernel/rcu/tree.c:1113 Code: 03 00 83 f8 07 89 c5 0f 87 81 00 00 00 48 8d 3c ed c0 c6 e6 8a 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 5b 48 03 1c ed c0 c6 e6 8a 48 b8 00 00 00 00 00 fc ff df 48 8d RSP: 0018:ffffc90000e5f9b0 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000035a80 RCX: ffffffff8158cce8 RDX: 1ffffffff15cd8d9 RSI: 0000000000000003 RDI: ffffffff8ae6c6c8 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d03798f R10: fffffbfff1a06f31 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88801c8df688 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f89a52df000 CR3: 0000000012417000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:106 [inline] rcu_read_lock_sched_held+0x1c/0x70 kernel/rcu/update.c:121 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x5c9/0x740 kernel/locking/lockdep.c:5408 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x134/0x1110 kernel/locking/mutex.c:1103 fd_array_map_delete_elem+0x120/0x2e0 kernel/bpf/arraymap.c:759 bpf_fd_array_map_clear kernel/bpf/arraymap.c:809 [inline] prog_array_map_clear_deferred+0x10b/0x1b0 kernel/bpf/arraymap.c:988 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296