INFO: task syz-executor:4520 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4520 tgid:4520 ppid:1 task_flags:0x40054c flags:0x00000005 Call trace: [<81b5771c>] (__schedule) from [<81b58bb4>] (__schedule_loop kernel/sched/core.c:7311 [inline]) [<81b5771c>] (__schedule) from [<81b58bb4>] (schedule+0x2c/0xec kernel/sched/core.c:7326) r10:ea97dd3c r9:ea97dd44 r8:00000002 r7:60070113 r6:82af13a0 r5:85490000 r4:85490000 [<81b58b88>] (schedule) from [<81b58cf8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7383) r5:85490000 r4:82af139c [<81b58ce0>] (schedule_preempt_disabled) from [<81b5be70>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81b58ce0>] (schedule_preempt_disabled) from [<81b5be70>] (__mutex_lock.constprop.0+0x50c/0xa48 kernel/locking/mutex.c:821) [<81b5b964>] (__mutex_lock.constprop.0) from [<81b5c480>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1164) r10:8539ea00 r9:85acd000 r8:82af1280 r7:82af1180 r6:00000000 r5:00000450 r4:82a0b244 [<81b5c46c>] (__mutex_lock_slowpath) from [<81b5c4c0>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81b5c484>] (mutex_lock) from [<8030c38c>] (exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]) [<81b5c484>] (mutex_lock) from [<8030c38c>] (synchronize_rcu_expedited+0x160/0x3f8 kernel/rcu/tree_exp.h:961) [<8030c22c>] (synchronize_rcu_expedited) from [<805cfe88>] (namespace_unlock+0x1fc/0x2a4 fs/namespace.c:1724) r8:ea97de08 r7:82b1e924 r6:82cde788 r5:82a04e00 r4:82b1e900 [<805cfc8c>] (namespace_unlock) from [<805d798c>] (class_namespace_excl_destructor fs/namespace.c:90 [inline]) [<805cfc8c>] (namespace_unlock) from [<805d798c>] (put_mnt_ns+0x134/0x1c0 fs/namespace.c:6283) r10:8539ea00 r9:00000000 r8:ea97de90 r7:85490890 r6:82cde788 r5:82a04e00 r4:85acd000 [<805d7858>] (put_mnt_ns) from [<80282da0>] (nsproxy_free kernel/nsproxy.c:66 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (deactivate_nsproxy kernel/nsproxy.c:80 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (put_nsproxy include/linux/nsproxy.h:110 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (put_nsproxy include/linux/nsproxy.h:107 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (switch_task_namespaces kernel/nsproxy.c:260 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (exit_nsproxy_namespaces+0x88/0xd8 kernel/nsproxy.c:265) r7:85490890 r6:85490890 r5:85490000 r4:858d1258 [<80282d18>] (exit_nsproxy_namespaces) from [<80257888>] (do_exit+0x2a8/0xadc kernel/exit.c:1003) r7:85490890 r6:8544394c r5:85490000 r4:85443800 [<802575e0>] (do_exit) from [<80258290>] (do_group_exit+0x40/0x8c kernel/exit.c:1147) r7:00000122 [<80258250>] (do_group_exit) from [<80269350>] (get_signal+0xa68/0xa90 kernel/signal.c:3038) r7:00000122 r4:85490000 [<802688e8>] (get_signal) from [<8022a630>] (do_signal arch/arm/kernel/signal.c:579 [inline]) [<802688e8>] (get_signal) from [<8022a630>] (do_work_pending+0x124/0x4f0 arch/arm/kernel/signal.c:619) r10:00000122 r9:85490000 r8:0000002c r7:00000122 r6:8020029c r5:ea97dfb0 r4:85490000 [<8022a50c>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x24) Exception stack(0xea97dfb0 to 0xea97dff8) dfa0: 0000002c 00e74218 0000002c 00000000 dfc0: 7e80fa54 0000000c 0000002c 00000122 00000000 00000001 00e74218 00000000 dfe0: 00000001 7e80f9e8 0010b9e4 0010ba74 20000010 00000003 r10:00000122 r9:85490000 r8:8020029c r7:00000122 r6:0000002c r5:0000000c r4:7e80fa54 INFO: task syz-executor:4520 is blocked on a mutex likely owned by task syz-executor:4523. task:syz-executor state:D stack:0 pid:4523 tgid:4523 ppid:1 task_flags:0x40054c flags:0x00000005 Call trace: [<81b5771c>] (__schedule) from [<81b58bb4>] (__schedule_loop kernel/sched/core.c:7311 [inline]) [<81b5771c>] (__schedule) from [<81b58bb4>] (schedule+0x2c/0xec kernel/sched/core.c:7326) r10:8539b480 r9:85acd200 r8:ea995da8 r7:82af1180 r6:82af1180 r5:0000044c r4:847bee40 [<81b58b88>] (schedule) from [<8030c4a8>] (synchronize_rcu_expedited+0x27c/0x3f8 kernel/rcu/tree_exp.h:976) r5:0000044c r4:82af12ac [<8030c22c>] (synchronize_rcu_expedited) from [<805cfe88>] (namespace_unlock+0x1fc/0x2a4 fs/namespace.c:1724) r8:ea995e08 r7:82b1e924 r6:82cde788 r5:82a04e00 r4:82b1e900 [<805cfc8c>] (namespace_unlock) from [<805d798c>] (class_namespace_excl_destructor fs/namespace.c:90 [inline]) [<805cfc8c>] (namespace_unlock) from [<805d798c>] (put_mnt_ns+0x134/0x1c0 fs/namespace.c:6283) r10:8539b480 r9:00000000 r8:ea995e90 r7:847bf6d0 r6:82cde788 r5:82a04e00 r4:85acd200 [<805d7858>] (put_mnt_ns) from [<80282da0>] (nsproxy_free kernel/nsproxy.c:66 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (deactivate_nsproxy kernel/nsproxy.c:80 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (put_nsproxy include/linux/nsproxy.h:110 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (put_nsproxy include/linux/nsproxy.h:107 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (switch_task_namespaces kernel/nsproxy.c:260 [inline]) [<805d7858>] (put_mnt_ns) from [<80282da0>] (exit_nsproxy_namespaces+0x88/0xd8 kernel/nsproxy.c:265) r7:847bf6d0 r6:847bf6d0 r5:847bee40 r4:86d5f960 [<80282d18>] (exit_nsproxy_namespaces) from [<80257888>] (do_exit+0x2a8/0xadc kernel/exit.c:1003) r7:847bf6d0 r6:853bf14c r5:847bee40 r4:853bf000 [<802575e0>] (do_exit) from [<80258290>] (do_group_exit+0x40/0x8c kernel/exit.c:1147) r7:00000122 [<80258250>] (do_group_exit) from [<80269350>] (get_signal+0xa68/0xa90 kernel/signal.c:3038) r7:00000122 r4:847bee40 [<802688e8>] (get_signal) from [<8022a630>] (do_signal arch/arm/kernel/signal.c:579 [inline]) [<802688e8>] (get_signal) from [<8022a630>] (do_work_pending+0x124/0x4f0 arch/arm/kernel/signal.c:619) r10:00000122 r9:847bee40 r8:00000028 r7:00000122 r6:8020029c r5:ea995fb0 r4:847bee40 [<8022a50c>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x24) Exception stack(0xea995fb0 to 0xea995ff8) 5fa0: 00000028 00e74218 00000028 00000000 5fc0: 7e948a44 0000000c 00000028 00000122 00000004 00000001 00e74218 00e74230 5fe0: 00000001 7e9489d8 0010b9e4 0010ba74 20000010 00000003 r10:00000122 r9:847bee40 r8:8020029c r7:00000122 r6:00000028 r5:0000000c r4:7e948a44 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:600f0093 r6:600f0093 r5:82332258 r4:00000000 [<80201a74>] (show_stack) from [<8021e5e0>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201a74>] (show_stack) from [<8021e5e0>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e584>] (dump_stack_lvl) from [<8021e60c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:000f0013 r5:00000001 r4:00000001 [<8021e5f4>] (dump_stack) from [<81b40dbc>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:122) [<81b40c6c>] (nmi_cpu_backtrace) from [<81b40f10>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:65) r7:82a0b150 r6:83320c40 r5:82a1c7b8 r4:ffffffff [<81b40ddc>] (nmi_trigger_cpumask_backtrace) from [<8022f0f4>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851) r9:82a0b2f0 r8:00000001 r7:82a1ce80 r6:82ccae2c r5:00007f3e r4:00000048 [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b48a4c>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]) [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b48a4c>] (__sys_info lib/sys_info.c:157 [inline]) [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b48a4c>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81b489e4>] (sys_info) from [<8038f87c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81b489e4>] (sys_info) from [<8038f87c>] (watchdog+0x3a0/0x848 kernel/hung_task.c:561) r5:00007f3e r4:0000000a [<8038f4dc>] (watchdog) from [<80281708>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:831d5600 r7:00000000 r6:8038f4dc r5:83320c40 r4:833e1140 [<802815ec>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8d5fb0 to 0xdf8d5ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802815ec r4:833e1140 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2827 Comm: pr/ttyAMA-1 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at slab_want_init_on_alloc mm/slab.h:707 [inline] PC is at slab_post_alloc_hook mm/slub.c:4577 [inline] PC is at slab_alloc_node mm/slub.c:4945 [inline] PC is at kmem_cache_alloc_node_noprof+0x27c/0x3ec mm/slub.c:5017 LR is at alloc_from_pcs mm/slub.c:4823 [inline] LR is at slab_alloc_node mm/slub.c:4933 [inline] LR is at kmem_cache_alloc_node_noprof+0x110/0x3ec mm/slub.c:5017 pc : [<805458bc>] lr : [<80545750>] psr: 60030113 sp : df801a58 ip : df801a58 fp : df801ab4 r10: 828d8bd0 r9 : 82a0b444 r8 : 86904780 r7 : 847024c0 r6 : 81631dc8 r5 : 00000820 r4 : 830e5c00 r3 : 00000001 r2 : 00000000 r1 : 82332258 r0 : 00000001 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86416100 DAC: fffffffd Call trace: frame pointer underflow [<80545640>] (kmem_cache_alloc_node_noprof) from [<81631dc8>] (__alloc_skb+0x74/0x2ec net/core/skbuff.c:704) r10:86824900 r9:81631fb8 r8:00000820 r7:00000000 r6:830e5c00 r5:ffffffff r4:dddd0808 [<81631d54>] (__alloc_skb) from [<817bf8a8>] (alloc_skb include/linux/skbuff.h:1384 [inline]) [<81631d54>] (__alloc_skb) from [<817bf8a8>] (synproxy_send_client_synack+0x7c/0x1f8 net/netfilter/nf_synproxy_core.c:463) r9:86824a14 r8:df801b50 r7:869eaa80 r6:00000100 r5:00000000 r4:869eaa80 [<817bf82c>] (synproxy_send_client_synack) from [<817fbbb0>] (nft_synproxy_eval_v4 net/netfilter/nft_synproxy.c:59 [inline]) [<817bf82c>] (synproxy_send_client_synack) from [<817fbbb0>] (nft_synproxy_do_eval+0x2bc/0x37c net/netfilter/nft_synproxy.c:141) r10:81e7dbb8 r9:86824a14 r8:00000014 r7:857c9280 r6:df801c1c r5:85ae9000 r4:869eaa80 [<817fb8f4>] (nft_synproxy_do_eval) from [<817fbc9c>] (nft_synproxy_eval+0x14/0x18 net/netfilter/nft_synproxy.c:247) r9:df801cb8 r8:85c59b88 r7:81e7de5c r6:81e7db78 r5:85c59ba0 r4:85c59b90 [<817fbc88>] (nft_synproxy_eval) from [<817c2c38>] (expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]) [<817fbc88>] (nft_synproxy_eval) from [<817c2c38>] (nft_do_chain+0x130/0x590 net/netfilter/nf_tables_core.c:285) [<817c2b08>] (nft_do_chain) from [<817dd518>] (nft_do_chain_inet+0x5c/0x150 net/netfilter/nft_chain_filter.c:162) r10:81e780ba r9:86110b20 r8:df801d24 r7:869eaa80 r6:86110b00 r5:8607f340 r4:00000000 [<817dd4bc>] (nft_do_chain_inet) from [<81788028>] (nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]) [<817dd4bc>] (nft_do_chain_inet) from [<81788028>] (nf_hook_slow+0x44/0x104 net/netfilter/core.c:619) r5:00000004 r4:00000001 [<81787fe4>] (nf_hook_slow) from [<81821238>] (nf_hook include/linux/netfilter.h:273 [inline]) [<81787fe4>] (nf_hook_slow) from [<81821238>] (NF_HOOK include/linux/netfilter.h:316 [inline]) [<81787fe4>] (nf_hook_slow) from [<81821238>] (ip_local_deliver+0xcc/0x10c net/ipv4/ip_input.c:262) r10:dddd25a0 r9:dddd2488 r8:00000040 r7:00000000 r6:85ae9000 r5:8485e000 r4:869eaa80 r3:00000000 [<8182116c>] (ip_local_deliver) from [<81820998>] (dst_input include/net/dst.h:480 [inline]) [<8182116c>] (ip_local_deliver) from [<81820998>] (ip_rcv_finish+0x98/0xb0 net/ipv4/ip_input.c:492) r6:8485e000 r5:85ae9000 r4:869eaa80 [<81820900>] (ip_rcv_finish) from [<818212c8>] (NF_HOOK include/linux/netfilter.h:318 [inline]) [<81820900>] (ip_rcv_finish) from [<818212c8>] (NF_HOOK include/linux/netfilter.h:312 [inline]) [<81820900>] (ip_rcv_finish) from [<818212c8>] (ip_rcv+0x50/0xec net/ipv4/ip_input.c:612) r7:00000000 r6:85ae9000 r5:8485e000 r4:869eaa80 [<81821278>] (ip_rcv) from [<8165b5a0>] (__netif_receive_skb_one_core+0x60/0x84 net/core/dev.c:6206) r6:00000000 r5:81821278 r4:8485e000 [<8165b540>] (__netif_receive_skb_one_core) from [<8165b60c>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:6319) r5:0000001f r4:869eaa80 [<8165b5f4>] (__netif_receive_skb) from [<8165b958>] (process_backlog+0xa0/0x17c net/core/dev.c:6670) r5:0000001f r4:869eaa80 [<8165b8b8>] (process_backlog) from [<8165c138>] (__napi_poll+0x34/0x268 net/core/dev.c:7729) r10:df801e98 r9:00000000 r8:0000012c r7:00000040 r6:df801e93 r5:dddd25a0 r4:00000001 [<8165c104>] (__napi_poll) from [<8165c6c8>] (napi_poll net/core/dev.c:7792 [inline]) [<8165c104>] (__napi_poll) from [<8165c6c8>] (net_rx_action+0x35c/0x3e8 net/core/dev.c:7949) r9:00000000 r8:0000012c r7:dddd25a0 r6:dddd25a4 r5:dddd2480 r4:ffffffff [<8165c36c>] (net_rx_action) from [<8025a0e0>] (handle_softirqs+0x160/0x4e4 kernel/softirq.c:622) r10:847024c0 r9:00000011 r8:00000101 r7:0000000c r6:00000001 r5:00000003 r4:82a0308c [<80259f80>] (handle_softirqs) from [<8025a600>] (__do_softirq kernel/softirq.c:656 [inline]) [<80259f80>] (handle_softirqs) from [<8025a600>] (invoke_softirq kernel/softirq.c:496 [inline]) [<80259f80>] (handle_softirqs) from [<8025a600>] (__irq_exit_rcu+0x150/0x1d0 kernel/softirq.c:735) r10:82b5cd1c r9:847024c0 r8:00000000 r7:eb4c1e78 r6:824e5628 r5:82520a54 r4:847024c0 [<8025a4b0>] (__irq_exit_rcu) from [<8025a938>] (irq_exit+0x10/0x18 kernel/softirq.c:764) r5:82520a54 r4:828d3e6c [<8025a928>] (irq_exit) from [<81b53dfc>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:293) [<81b53d80>] (generic_handle_arch_irq) from [<81b20a8c>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40) r9:847024c0 r8:00000000 r7:eb4c1eac r6:ffffffff r5:60030113 r4:81b6207c [<81b20a70>] (call_with_stack) from [<80200bec>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:228) Exception stack(0xeb4c1e78 to 0xeb4c1ec0) 1e60: 84751840 60030113 1e80: 00000000 00000717 00000001 00000000 82b5cc80 00000117 00000000 00000000 1ea0: 82b5cd1c eb4c1ed4 eb4c1ed8 eb4c1ec8 80b004c4 81b6207c 60030113 ffffffff [<81b62054>] (_raw_spin_unlock_irqrestore) from [<80b004c4>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]) [<81b62054>] (_raw_spin_unlock_irqrestore) from [<80b004c4>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:618 [inline]) [<81b62054>] (_raw_spin_unlock_irqrestore) from [<80b004c4>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2700) [<80b004a4>] (pl011_console_device_unlock) from [<802ec160>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165) [<802ec0d8>] (nbcon_emit_one) from [<802ec3e0>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271) r6:82cc72ec r5:82b5cc80 r4:847024c0 [<802ec1d8>] (nbcon_kthread_func) from [<80281708>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:eafe9b38 r8:842fcd80 r7:82b5cc80 r6:802ec1d8 r5:847024c0 r4:8382ea00 [<802815ec>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeb4c1fb0 to 0xeb4c1ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802815ec r4:8382ea00