INFO: task syz.0.3616:15035 blocked for more than 430 seconds. Tainted: G L syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.3616 state:D stack:0 pid:15035 tgid:15031 ppid:14416 task_flags:0x40054c flags:0x00000005 Call trace: [<81b1c6fc>] (__schedule) from [<81b1db90>] (__schedule_loop kernel/sched/core.c:7268 [inline]) [<81b1c6fc>] (__schedule) from [<81b1db90>] (schedule+0x2c/0x134 kernel/sched/core.c:7283) r10:843cc000 r9:00000000 r8:859f9000 r7:851fb528 r6:dfb9dd88 r5:dfb9dd30 r4:8339be80 [<81b1db64>] (schedule) from [<80783a2c>] (request_wait_answer fs/fuse/dev.c:590 [inline]) [<81b1db64>] (schedule) from [<80783a2c>] (__fuse_request_send fs/fuse/dev.c:604 [inline]) [<81b1db64>] (schedule) from [<80783a2c>] (__fuse_simple_request+0x3b8/0x520 fs/fuse/dev.c:699) r5:dfb9dd30 r4:851fb4d0 [<80783674>] (__fuse_simple_request) from [<8078cfa0>] (fuse_simple_request fs/fuse/fuse_i.h:1262 [inline]) [<80783674>] (__fuse_simple_request) from [<8078cfa0>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:500) r8:83386180 r7:85daa4c0 r6:859e2b00 r5:83656fc0 r4:838cef80 [<8078ce28>] (fuse_flush) from [<80580abc>] (filp_flush+0x38/0x88 fs/open.c:1467) r8:00000000 r7:862b2a40 r6:859e2b00 r5:859e2b00 r4:838cef80 [<80580a84>] (filp_flush) from [<80580b20>] (filp_close+0x14/0x28 fs/open.c:1480) r7:862b2a40 r6:859e2b00 r5:838cef80 r4:00000003 [<80580b0c>] (filp_close) from [<805b2ad4>] (close_files fs/file.c:494 [inline]) [<80580b0c>] (filp_close) from [<805b2ad4>] (put_files_struct fs/file.c:509 [inline]) [<80580b0c>] (filp_close) from [<805b2ad4>] (put_files_struct+0x80/0xe8 fs/file.c:506) r5:00000010 r4:00000003 [<805b2a54>] (put_files_struct) from [<805b2b7c>] (exit_files+0x40/0x44 fs/file.c:526) r9:00000000 r8:dfb9de90 r7:8339c750 r6:8339c750 r5:859e2b00 r4:8339be80 [<805b2b3c>] (exit_files) from [<80257c20>] (do_exit+0x77c/0xb04 kernel/exit.c:971) r7:8339c750 r6:8514a68c r5:8514a580 r4:8339be80 [<802574a4>] (do_exit) from [<80258178>] (do_group_exit+0x40/0x8c kernel/exit.c:1119) r7:000001be [<80258138>] (do_group_exit) from [<802691c4>] (get_signal+0xa8c/0xab4 kernel/signal.c:3037) r7:000001be r4:8339be80 [<80268738>] (get_signal) from [<8022a640>] (do_signal arch/arm/kernel/signal.c:579 [inline]) [<80268738>] (get_signal) from [<8022a640>] (do_work_pending+0x124/0x4f0 arch/arm/kernel/signal.c:619) r10:000001be r9:8339be80 r8:00000000 r7:000001be r6:8020029c r5:dfb9dfb0 r4:8339be80 [<8022a51c>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x24) Exception stack(0xdfb9dfb0 to 0xdfb9dff8) dfa0: 00000000 00000008 00000000 00000000 dfc0: 00000000 00000000 003463ac 000001be 00346378 00000000 00000001 76fbf0dc dfe0: 76fbee88 76fbee78 00018ebc 00130810 60000010 00000005 r10:000001be r9:8339be80 r8:8020029c r7:000001be r6:003463ac r5:00000000 r4:00000000 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 29 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express Call trace: [<80201a14>] (dump_backtrace) from [<80201b08>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:60000093 r6:60000093 r5:8231dcdc r4:00000000 [<80201af0>] (show_stack) from [<8021e31c>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201af0>] (show_stack) from [<8021e31c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e2c0>] (dump_stack_lvl) from [<8021e348>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00000013 r5:00000001 r4:00000001 [<8021e330>] (dump_stack) from [<81b05fd4>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113) [<81b05e84>] (nmi_cpu_backtrace) from [<81b06124>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:82a0b550 r5:82a1a2b8 r4:ffffffff [<81b05ff4>] (nmi_trigger_cpumask_backtrace) from [<8022f104>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:82a0b6d8 r8:00000048 r7:0000000a r6:82a03d80 r5:00007f36 r4:00000048 [<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0dc70>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]) [<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0dc70>] (__sys_info lib/sys_info.c:157 [inline]) [<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0dc70>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81b0dc08>] (sys_info) from [<8038acc4>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81b0dc08>] (sys_info) from [<8038acc4>] (watchdog+0x3ac/0x858 kernel/hung_task.c:561) r5:00007f36 r4:00000001 [<8038a918>] (watchdog) from [<80281540>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e58 r8:83352680 r7:00000000 r6:8038a918 r5:833a0c80 r4:831f7480 [<80281424>] (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 r5:80281424 r4:831f7480 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2822 Comm: pr/ttyAMA-1 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at 0x7f00f294 LR is at bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] LR is at __bpf_prog_run include/linux/filter.h:722 [inline] LR is at bpf_prog_run include/linux/filter.h:729 [inline] LR is at bpf_prog_run_pin_on_cpu include/linux/filter.h:746 [inline] LR is at bpf_prog_run_clear_cb+0x5c/0x278 include/linux/filter.h:1007 pc : [<7f00f294>] lr : [<8197c9c0>] psr: 20000113 sp : df801b38 ip : df801b38 fp : df801b5c r10: 86fa5250 r9 : 8470d000 r8 : 0000005a r7 : 000005dc r6 : 83850f00 r5 : ebecd000 r4 : 84011900 r3 : 7f00f294 r2 : 00000101 r1 : ebecd048 r0 : 83850f00 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85cf8540 DAC: fffffffd Call trace: frame pointer underflow [<8197c964>] (bpf_prog_run_clear_cb) from [<8198308c>] (run_filter net/packet/af_packet.c:2082 [inline]) [<8197c964>] (bpf_prog_run_clear_cb) from [<8198308c>] (packet_rcv+0xfc/0x4dc net/packet/af_packet.c:2155) r9:8470d000 r8:0000005a r7:8470d000 r6:8470d000 r5:8517e000 r4:83850f00 [<81982f90>] (packet_rcv) from [<816191a0>] (deliver_skb+0x80/0xb4 net/core/dev.c:2492) r10:00000008 r9:8470d000 r8:df801c98 r7:81982f90 r6:8470d000 r5:8517e440 r4:83850f00 [<81619120>] (deliver_skb) from [<816272a8>] (deliver_ptype_list_skb net/core/dev.c:2507 [inline]) [<81619120>] (deliver_skb) from [<816272a8>] (__netif_receive_skb_core.constprop.0+0x8ac/0xf68 net/core/dev.c:6146) r7:828d3358 r6:82a0de30 r5:82a171bc r4:83850f00 [<816269fc>] (__netif_receive_skb_core.constprop.0) from [<81627a88>] (__netif_receive_skb_list_core+0x124/0x278 net/core/dev.c:6277) r10:00000000 r9:83978094 r8:00000000 r7:df801ca0 r6:00000000 r5:00000000 r4:83850f00 [<81627964>] (__netif_receive_skb_list_core) from [<816282a0>] (__netif_receive_skb_list net/core/dev.c:6344 [inline]) [<81627964>] (__netif_receive_skb_list_core) from [<816282a0>] (netif_receive_skb_list_internal+0x1c0/0x2f0 net/core/dev.c:6435) r10:00000000 r9:00000000 r8:84011900 r7:83978094 r6:83978094 r5:df801cf8 r4:00000000 [<816280e0>] (netif_receive_skb_list_internal) from [<816286d4>] (gro_normal_list include/net/gro.h:523 [inline]) [<816280e0>] (netif_receive_skb_list_internal) from [<816286d4>] (gro_normal_list include/net/gro.h:519 [inline]) [<816280e0>] (netif_receive_skb_list_internal) from [<816286d4>] (gro_flush_normal include/net/gro.h:531 [inline]) [<816280e0>] (netif_receive_skb_list_internal) from [<816286d4>] (napi_complete_done+0x104/0x1ec net/core/dev.c:6803) r10:00000040 r9:83978008 r8:8470d700 r7:00000001 r6:00000000 r5:83978094 r4:83978008 [<816285d0>] (napi_complete_done) from [<80dcf978>] (virtqueue_napi_complete drivers/net/virtio_net.c:740 [inline]) [<816285d0>] (napi_complete_done) from [<80dcf978>] (virtnet_poll+0x87c/0xec0 drivers/net/virtio_net.c:3021) r8:8470d700 r7:8301b780 r6:83978158 r5:00009e55 r4:00000000 [<80dcf0fc>] (virtnet_poll) from [<816287f0>] (__napi_poll+0x34/0x270 net/core/dev.c:7733) r10:df801e98 r9:00000000 r8:0000012c r7:00000040 r6:df801e93 r5:83978008 r4:00000001 [<816287bc>] (__napi_poll) from [<81628d88>] (napi_poll net/core/dev.c:7796 [inline]) [<816287bc>] (__napi_poll) from [<81628d88>] (net_rx_action+0x35c/0x3e8 net/core/dev.c:7953) r9:00000000 r8:0000012c r7:83978008 r6:8397800c r5:dddd2340 r4:ffffffff [<81628a2c>] (net_rx_action) from [<80259fd0>] (handle_softirqs+0x160/0x4f4 kernel/softirq.c:622) r10:84011900 r9:00000008 r8:00000101 r7:0000000c r6:00000004 r5:00000003 r4:82a0308c [<80259e70>] (handle_softirqs) from [<8025a500>] (__do_softirq kernel/softirq.c:656 [inline]) [<80259e70>] (handle_softirqs) from [<8025a500>] (invoke_softirq kernel/softirq.c:496 [inline]) [<80259e70>] (handle_softirqs) from [<8025a500>] (__irq_exit_rcu+0x150/0x1d0 kernel/softirq.c:735) r10:82b58bf4 r9:84011900 r8:00000000 r7:eb3ede78 r6:824cd8bc r5:82508a30 r4:84011900 [<8025a3b0>] (__irq_exit_rcu) from [<8025a838>] (irq_exit+0x10/0x18 kernel/softirq.c:764) r5:82508a30 r4:828d1d6c [<8025a828>] (irq_exit) from [<81b18d80>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:293) [<81b18d04>] (generic_handle_arch_irq) from [<81ae5c1c>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40) r9:84011900 r8:00000000 r7:eb3edeac r6:ffffffff r5:60000113 r4:81b26fb8 [<81ae5c00>] (call_with_stack) from [<80200bec>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:228) Exception stack(0xeb3ede78 to 0xeb3edec0) de60: 8475c840 60000113 de80: 00000000 00004ade 00000001 00000000 82b58b58 00000117 00000000 00000000 dea0: 82b58bf4 eb3eded4 eb3eded8 eb3edec8 80ae1fac 81b26fb8 60000113 ffffffff [<81b26f90>] (_raw_spin_unlock_irqrestore) from [<80ae1fac>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]) [<81b26f90>] (_raw_spin_unlock_irqrestore) from [<80ae1fac>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]) [<81b26f90>] (_raw_spin_unlock_irqrestore) from [<80ae1fac>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2668) [<80ae1f8c>] (pl011_console_device_unlock) from [<802e8ad8>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165) [<802e8a50>] (nbcon_emit_one) from [<802e8d58>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271) r6:82cbf2d4 r5:82b58b58 r4:84011900 [<802e8b50>] (nbcon_kthread_func) from [<80281540>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:ea96db38 r8:84843700 r7:82b58b58 r6:802e8b50 r5:84011900 r4:838b06c0 [<80281424>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeb3edfb0 to 0xeb3edff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281424 r4:838b06c0