INFO: task syz-executor.1:8476 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:22952 pid: 8476 ppid: 1 flags:0x00000004 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_sys_getsockopt net/socket.c:2171 [inline] __se_sys_getsockopt net/socket.c:2168 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2168 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460d2a RSP: 002b:00007fff1b5c1528 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007fff1b5c1540 RCX: 0000000000460d2a RDX: 0000000000000060 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007fff1b5c153c R09: 000000000000000a R10: 00007fff1b5c1540 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000032 R15: 00000000000d404e INFO: task syz-executor.2:8478 blocked for more than 144 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:22952 pid: 8478 ppid: 1 flags:0x00000004 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 exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] synchronize_rcu_expedited+0x27e/0x610 kernel/rcu/tree_exp.h:836 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 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0x8ec/0xb70 net/ipv6/netfilter/ip6_tables.c:1636 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008 tcp_setsockopt+0x136/0x2440 net/ipv4/tcp.c:3597 __sys_setsockopt+0x2db/0x610 net/socket.c:2115 __do_sys_setsockopt net/socket.c:2126 [inline] __se_sys_setsockopt net/socket.c:2123 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2123 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460d4a RSP: 002b:00007ffc0beaedc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007ffc0beaedf0 RCX: 0000000000460d4a RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000074cca0 R08: 00000000000003b8 R09: 0000000000004000 R10: 000000000074ab40 R11: 0000000000000202 R12: 00007ffc0beaee50 R13: 0000000000000003 R14: 000000000074aae0 R15: 0000000000000029 INFO: task syz-executor.5:8495 blocked for more than 145 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:23928 pid: 8495 ppid: 1 flags:0x00000004 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 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline] synchronize_rcu_expedited+0x59d/0x610 kernel/rcu/tree_exp.h:836 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 do_replace net/ipv4/netfilter/arp_tables.c:984 [inline] do_arpt_set_ctl+0xad8/0xea0 net/ipv4/netfilter/arp_tables.c:1418 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_sys_setsockopt net/socket.c:2126 [inline] __se_sys_setsockopt net/socket.c:2123 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2123 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460d4a RSP: 002b:00007ffc3880bc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007ffc3880bcc0 RCX: 0000000000460d4a RDX: 0000000000000060 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000408 R09: 0000000000004000 R10: 000000000074a490 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000032 R15: 00000000000d4063 INFO: task syz-executor.3:418 blocked for more than 145 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27480 pid: 418 ppid: 8480 flags:0x00000004 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 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline] synchronize_rcu_expedited+0x59d/0x610 kernel/rcu/tree_exp.h:836 synchronize_rcu+0xdf/0x180 kernel/rcu/tree.c:3690 synchronize_net+0x47/0x50 net/core/dev.c:10676 packet_release+0xa13/0xc90 net/packet/af_packet.c:3087 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417b71 RSP: 002b:00007fffe8c06b40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000417b71 RDX: fffffffffffffff7 RSI: 0000000080000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000c14 R09: 00000000622f4c18 R10: 00007fffe8c06c20 R11: 0000000000000293 R12: 000000000119ca00 R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c184 INFO: task syz-executor.3:424 blocked for more than 146 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:29656 pid: 424 ppid: 8480 flags:0x00000004 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 account_event kernel/events/core.c:11217 [inline] perf_event_alloc.part.0+0x3121/0x38e0 kernel/events/core.c:11432 perf_event_alloc kernel/events/core.c:11740 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11838 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f927adefc68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fffe8c06acf R14: 00007f927adf09c0 R15: 000000000119bf8c INFO: task syz-executor.3:439 blocked for more than 146 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:29656 pid: 439 ppid: 8480 flags:0x00000004 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 account_event kernel/events/core.c:11209 [inline] perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 perf_event_alloc kernel/events/core.c:11740 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11838 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f927adadc68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000119c120 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119c0dc R13: 00007fffe8c06acf R14: 00007f927adae9c0 R15: 000000000119c0dc INFO: task syz-executor.0:423 blocked for more than 146 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29656 pid: 423 ppid: 8474 flags:0x00000004 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 account_event kernel/events/core.c:11209 [inline] perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 perf_event_alloc kernel/events/core.c:11740 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11838 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f61de668c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff86ead6af R14: 00007f61de6699c0 R15: 000000000119bf8c INFO: task syz-executor.0:450 blocked for more than 147 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29120 pid: 450 ppid: 8474 flags:0x00000004 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 account_event kernel/events/core.c:11209 [inline] perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 perf_event_alloc kernel/events/core.c:11740 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11838 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f61de626c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000119c120 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119c0dc R13: 00007fff86ead6af R14: 00007f61de6279c0 R15: 000000000119c0dc INFO: task syz-executor.4:428 blocked for more than 147 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:29656 pid: 428 ppid: 8482 flags:0x00000004 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 account_event kernel/events/core.c:11209 [inline] perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 perf_event_alloc kernel/events/core.c:11740 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11838 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007ff367952c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fffa8a2fadf R14: 00007ff3679539c0 R15: 000000000119bf8c INFO: task syz-executor.4:440 blocked for more than 147 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:29656 pid: 440 ppid: 8482 flags:0x00000004 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 account_event kernel/events/core.c:11209 [inline] perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 perf_event_alloc kernel/events/core.c:11740 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11838 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007ff367910c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000119c120 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119c0dc R13: 00007fffa8a2fadf R14: 00007ff3679119c0 R15: 000000000119c0dc Showing all locks held in the system: 2 locks held by kworker/1:0/19: 3 locks held by kworker/u4:2/45: 4 locks held by kworker/u4:4/301: #0: ffff888023406938 ((wq_completion)phy13){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888023406938 ((wq_completion)phy13){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888023406938 ((wq_completion)phy13){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888023406938 ((wq_completion)phy13){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888023406938 ((wq_completion)phy13){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888023406938 ((wq_completion)phy13){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246 #1: ffffc9000164fda8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 #2: ffff88801c990cc0 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1017 [inline] #2: ffff88801c990cc0 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x93/0xe80 net/mac80211/ibss.c:1683 #3: ffff88805e201548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_ibss_sta_expire net/mac80211/ibss.c:1262 [inline] #3: ffff88805e201548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_sta_merge_ibss net/mac80211/ibss.c:1305 [inline] #3: ffff88805e201548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x481/0xe80 net/mac80211/ibss.c:1711 1 lock held by khungtaskd/1660: #0: ffffffff8b373aa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by kcompactd0/1664: #0: ffffffff8b4896a8 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4b1/0x670 mm/page_alloc.c:3073 1 lock held by khugepaged/1667: #0: ffffffff8b4896a8 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4f/0x670 mm/page_alloc.c:3070 1 lock held by in:imklog/8166: #0: ffff8880151ae870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 1 lock held by syz-executor.1/8476: #0: ffff8881477b8458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 2 locks held by syz-executor.2/8478: #0: ffff8881477b8d88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 #1: ffffffff8b37c368 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #1: ffffffff8b37c368 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x27e/0x610 kernel/rcu/tree_exp.h:836 1 lock held by syz-executor.5/8495: #0: ffff8881477b8458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 1 lock held by syz-executor.3/418: #0: ffff88806584b690 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff88806584b690 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:596 2 locks held by syz-executor.3/424: #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11209 [inline] #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 #1: ffffffff8b37c368 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8b37c368 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f2/0x610 kernel/rcu/tree_exp.h:836 1 lock held by syz-executor.3/439: #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11209 [inline] #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 1 lock held by syz-executor.0/423: #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11209 [inline] #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 1 lock held by syz-executor.0/450: #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11209 [inline] #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 1 lock held by syz-executor.4/428: #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11209 [inline] #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 1 lock held by syz-executor.4/440: #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: account_event kernel/events/core.c:11209 [inline] #0: ffffffff8b434e28 (perf_sched_mutex){+.+.}-{3:3}, at: perf_event_alloc.part.0+0x2fde/0x38e0 kernel/events/core.c:11432 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1660 Comm: khungtaskd Not tainted 5.11.0-rc2-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: 4895 Comm: systemd-journal Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7f7ad57b8350 Code: c1 48 89 42 20 e9 73 ff ff ff b8 01 00 00 00 e9 ce fd ff ff 66 0f 1f 44 00 00 48 89 f2 be 08 00 00 00 e9 53 0b f4 ff 0f 1f 00 <48> 83 ec 18 48 89 f2 be 08 00 00 00 48 89 7c 24 08 48 8d 7c 24 08 RSP: 002b:00007ffc86190108 EFLAGS: 00000202 RAX: 00007f7ad58d63b0 RBX: 0000561e1e931230 RCX: 6c7967656e657261 RDX: 7465646279746573 RSI: 00007ffc86190110 RDI: 0000000000000011 RBP: 0000000000000011 R08: 00007f7ad58daaa0 R09: 0000000000000000 R10: 00007ffc86190450 R11: 0000000000000246 R12: 0000000000000011 R13: 00007ffc861902f0 R14: 00007ffc861902e8 R15: 00007ffc861902f0 FS: 00007f7ad5af08c0 GS: 0000000000000000