INFO: task dhcpcd:2959 blocked for more than 430 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:dhcpcd state:D stack:0 pid:2959 tgid:2959 ppid:2958 task_flags:0x400140 flags:0x00000004 Call trace: [<81b1e4fc>] (__schedule) from [<81b1f990>] (__schedule_loop kernel/sched/core.c:7268 [inline]) [<81b1e4fc>] (__schedule) from [<81b1f990>] (schedule+0x2c/0x134 kernel/sched/core.c:7283) r10:ebd39c1c r9:ebd39c24 r8:00000002 r7:60000013 r6:82e31da8 r5:8528be80 r4:8528be80 [<81b1f964>] (schedule) from [<81b1fb1c>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7340) r5:8528be80 r4:82e31da4 [<81b1fb04>] (schedule_preempt_disabled) from [<81b22bfc>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81b1fb04>] (schedule_preempt_disabled) from [<81b22bfc>] (__mutex_lock.constprop.0+0x530/0xa88 kernel/locking/mutex.c:820) [<81b226cc>] (__mutex_lock.constprop.0) from [<81b23228>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1114) r10:00002000 r9:00002000 r8:85f57680 r7:85f576e4 r6:8384be40 r5:85f57680 r4:81648518 [<81b23214>] (__mutex_lock_slowpath) from [<81b23268>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81b2322c>] (mutex_lock) from [<8163d6d0>] (rtnl_lock net/core/rtnetlink.c:80 [inline]) [<81b2322c>] (mutex_lock) from [<8163d6d0>] (rtnl_dumpit+0x70/0x8c net/core/rtnetlink.c:6865) [<8163d660>] (rtnl_dumpit) from [<817251fc>] (netlink_dump+0x16c/0x4a8 net/netlink/af_netlink.c:2330) r7:85f576e4 r6:00001f00 r5:85f57400 r4:8384be40 [<81725090>] (netlink_dump) from [<8172571c>] (netlink_recvmsg+0x1e4/0x284 net/netlink/af_netlink.c:1981) r10:00002000 r9:00001f3c r8:854a1bc0 r7:ebd39f20 r6:00000000 r5:8384f900 r4:85f57400 [<81725538>] (netlink_recvmsg) from [<815ece8c>] (sock_recvmsg_nosec net/socket.c:1138 [inline]) [<81725538>] (netlink_recvmsg) from [<815ece8c>] (sock_recvmsg+0x50/0x78 net/socket.c:1160) r10:ebd39de4 r9:00000000 r8:7e8071c8 r7:00000000 r6:854a1bc0 r5:ebd39f20 r4:81725538 [<815ece3c>] (sock_recvmsg) from [<815ed08c>] (____sys_recvmsg+0x90/0x184 net/socket.c:2919) r7:00000000 r6:854a1bc0 r5:7e8071d4 r4:ebd39f20 [<815ecffc>] (____sys_recvmsg) from [<815ee818>] (___sys_recvmsg+0x88/0xbc net/socket.c:2961) r10:00000129 r9:8528be80 r8:854a1bc0 r7:00000000 r6:7e8071d4 r5:ebd39f20 r4:00000000 [<815ee790>] (___sys_recvmsg) from [<815f0bdc>] (__sys_recvmsg+0x88/0xdc net/socket.c:2994) r8:838d4280 r7:00000000 r6:7e8071d4 r5:838d4280 r4:0000001d [<815f0b54>] (__sys_recvmsg) from [<815f0c44>] (__do_sys_recvmsg net/socket.c:3000 [inline]) [<815f0b54>] (__sys_recvmsg) from [<815f0c44>] (sys_recvmsg+0x14/0x18 net/socket.c:2997) r8:8020029c r7:00000129 r6:76f36140 r5:00000000 r4:00000000 [<815f0c30>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xebd39fa8 to 0xebd39ff0) 9fa0: 00000000 00000000 0000001d 7e8071d4 00000000 00000000 9fc0: 00000000 00000000 76f36140 00000129 7e80727c 00000000 022ae8b0 7e8071c8 9fe0: 00000001 7e807158 00000000 76e3a590 INFO: task dhcpcd:2959 is blocked on a mutex likely owned by task kworker/u8:3:10025. task:kworker/u8:3 state:R running task stack:0 pid:10025 tgid:10025 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: netns cleanup_net Call trace: [<81b1e4fc>] (__schedule) from [<81b1fc24>] (preempt_schedule_common kernel/sched/core.c:7370 [inline]) [<81b1e4fc>] (__schedule) from [<81b1fc24>] (preempt_schedule+0x4c/0xb4 kernel/sched/core.c:7394) r10:85dd57e4 r9:85309504 r8:00000108 r7:8025a6c8 r6:00000001 r5:846bcb00 r4:8025a6c8 [<81b1fbd8>] (preempt_schedule) from [<8025a6c8>] (__local_bh_enable_ip+0x6c/0xd0 kernel/softirq.c:457) r7:e03d5c20 r6:00000000 r5:00000001 r4:846bcb00 [<8025a65c>] (__local_bh_enable_ip) from [<81b28c44>] (__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:196 [inline]) [<8025a65c>] (__local_bh_enable_ip) from [<81b28c44>] (_raw_spin_unlock_bh+0x34/0x38 kernel/locking/spinlock.c:214) r5:00000000 r4:85cdcc00 [<81b28c10>] (_raw_spin_unlock_bh) from [<818f9f70>] (spin_unlock_bh include/linux/spinlock.h:396 [inline]) [<81b28c10>] (_raw_spin_unlock_bh) from [<818f9f70>] (addrconf_ifdown+0x150/0x768 net/ipv6/addrconf.c:3921) [<818f9e20>] (addrconf_ifdown) from [<819007bc>] (addrconf_notify+0x60/0x8d0 net/ipv6/addrconf.c:3790) r10:00000006 r9:00000000 r8:e03d5da4 r7:85dd5000 r6:00000006 r5:85cdcc00 r4:85d20000 [<8190075c>] (addrconf_notify) from [<80285f14>] (notifier_call_chain+0x8c/0x220 kernel/notifier.c:85) r10:00000006 r9:00000000 r8:ffffffd1 r7:00000002 r6:82bf1698 r5:82bf23d0 r4:8190075c [<80285e88>] (notifier_call_chain) from [<8028618c>] (raw_notifier_call_chain+0x20/0x28 kernel/notifier.c:453) r10:8162e02c r9:00000000 r8:85d20648 r7:00000002 r6:85dd5000 r5:00000006 r4:e03d5da4 [<8028616c>] (raw_notifier_call_chain) from [<816226b4>] (call_netdevice_notifiers_info+0x54/0xa0 net/core/dev.c:2249) [<81622660>] (call_netdevice_notifiers_info) from [<8162ee54>] (call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]) [<81622660>] (call_netdevice_notifiers_info) from [<8162ee54>] (call_netdevice_notifiers net/core/dev.c:2301 [inline]) [<81622660>] (call_netdevice_notifiers_info) from [<8162ee54>] (unregister_netdevice_many_notify+0x600/0xc1c net/core/dev.c:12421) r6:00000180 r5:00000000 r4:85d20000 [<8162e854>] (unregister_netdevice_many_notify) from [<816302e4>] (unregister_netdevice_many net/core/dev.c:12484 [inline]) [<8162e854>] (unregister_netdevice_many_notify) from [<816302e4>] (default_device_exit_batch+0x304/0x384 net/core/dev.c:13076) r10:85dd5190 r9:85dd5000 r8:82e30c80 r7:e03d5e98 r6:85dd5190 r5:e03d5eb8 r4:85dd5094 [<8162ffe0>] (default_device_exit_batch) from [<8160f898>] (ops_exit_list net/core/net_namespace.c:205 [inline]) [<8162ffe0>] (default_device_exit_batch) from [<8160f898>] (ops_undo_list+0x10c/0x238 net/core/net_namespace.c:252) r10:00000001 r9:e03d5e58 r8:82bdec98 r7:82bdf2ac r6:82bdec98 r5:e03d5e98 r4:e03d5eb8 [<8160f78c>] (ops_undo_list) from [<8161207c>] (cleanup_net+0x208/0x358 net/core/net_namespace.c:702) r10:853b1000 r9:82bdec7c r8:00000cc0 r7:85dd5020 r6:e03d5eb8 r5:ffffffd4 r4:82e30c40 [<81611e74>] (cleanup_net) from [<80276084>] (process_one_work+0x1c8/0x5a0 kernel/workqueue.c:3314) r10:8302d215 r9:846bcb00 r8:02000000 r7:83012a00 r6:8302d200 r5:82bdec6c r4:85fb0180 [<80275ebc>] (process_one_work) from [<80276d50>] (process_scheduled_works kernel/workqueue.c:3397 [inline]) [<80275ebc>] (process_one_work) from [<80276d50>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3478) r10:00000000 r9:85fb01b0 r8:846bcb00 r7:82a03d80 r6:83012a20 r5:83012a00 r4:85fb0180 [<80276be4>] (worker_thread) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df931e88 r8:8bf85580 r7:85fb0180 r6:80276be4 r5:846bcb00 r4:8be10900 [<80281474>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe03d5fb0 to 0xe03d5ff8) 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 r5:80281474 r4:8be10900 INFO: task syz-executor:10262 blocked for more than 430 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:10262 tgid:10262 ppid:1 task_flags:0x400140 flags:0x00000001 Call trace: [<81b1e4fc>] (__schedule) from [<81b1f990>] (__schedule_loop kernel/sched/core.c:7268 [inline]) [<81b1e4fc>] (__schedule) from [<81b1f990>] (schedule+0x2c/0x134 kernel/sched/core.c:7283) r10:dfa8db94 r9:dfa8db9c r8:00000002 r7:60000013 r6:82e31da8 r5:85230c80 r4:85230c80 [<81b1f964>] (schedule) from [<81b1fb1c>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7340) r5:85230c80 r4:82e31da4 [<81b1fb04>] (schedule_preempt_disabled) from [<81b22bfc>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81b1fb04>] (schedule_preempt_disabled) from [<81b22bfc>] (__mutex_lock.constprop.0+0x530/0xa88 kernel/locking/mutex.c:820) [<81b226cc>] (__mutex_lock.constprop.0) from [<81b23228>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1114) r10:dfa8dd30 r9:00000000 r8:864c98c0 r7:00000000 r6:00000000 r5:8530b800 r4:82a19178 [<81b23214>] (__mutex_lock_slowpath) from [<81b23268>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81b2322c>] (mutex_lock) from [<81643988>] (rtnl_lock net/core/rtnetlink.c:80 [inline]) [<81b2322c>] (mutex_lock) from [<81643988>] (rtnl_nets_lock net/core/rtnetlink.c:341 [inline]) [<81b2322c>] (mutex_lock) from [<81643988>] (rtnl_newlink+0x338/0xad8 net/core/rtnetlink.c:4109) [<81643650>] (rtnl_newlink) from [<8163fe24>] (rtnetlink_rcv_msg+0x2dc/0x340 net/core/rtnetlink.c:6997) r10:00000000 r9:00000000 r8:82e31da0 r7:8bd18240 r6:00000000 r5:81643650 r4:864c98c0 [<8163fb48>] (rtnetlink_rcv_msg) from [<817276f4>] (netlink_rcv_skb+0xc0/0x120 net/netlink/af_netlink.c:2555) r10:85f2fd84 r9:853b0000 r8:8bd18240 r7:864c98c0 r6:8163fb48 r5:8bd18240 r4:00000000 [<81727634>] (netlink_rcv_skb) from [<8163e7e4>] (rtnetlink_rcv+0x18/0x1c net/core/rtnetlink.c:7024) r7:8bf62540 r6:00000054 r5:852fbc64 r4:852fbc00 [<8163e7cc>] (rtnetlink_rcv) from [<81726ec0>] (netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]) [<8163e7cc>] (rtnetlink_rcv) from [<81726ec0>] (netlink_unicast+0x270/0x380 net/netlink/af_netlink.c:1344) [<81726c50>] (netlink_unicast) from [<81727198>] (netlink_sendmsg+0x1c8/0x444 net/netlink/af_netlink.c:1899) r10:00000000 r9:00000000 r8:00000000 r7:85f2fc00 r6:00000054 r5:8bd18240 r4:dfa8de98 [<81726fd0>] (netlink_sendmsg) from [<815ed2b8>] (sock_sendmsg_nosec net/socket.c:787 [inline]) [<81726fd0>] (netlink_sendmsg) from [<815ed2b8>] (__sock_sendmsg+0x44/0x78 net/socket.c:802) r10:00000122 r9:838d4e00 r8:8363e040 r7:7eb3455c r6:8363e040 r5:dfa8de98 r4:00000000 [<815ed274>] (__sock_sendmsg) from [<815f01f0>] (__sys_sendto+0x110/0x160 net/socket.c:2266) r7:7eb3455c r6:838d4e00 r5:00000000 r4:00000000 [<815f00e0>] (__sys_sendto) from [<815f025c>] (__do_sys_sendto net/socket.c:2273 [inline]) [<815f00e0>] (__sys_sendto) from [<815f025c>] (sys_sendto+0x1c/0x24 net/socket.c:2269) r9:85230c80 r8:8020029c r7:00000122 r6:00000054 r5:0000000c r4:7eb3455c [<815f0240>] (sys_sendto) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa8dfa8 to 0xdfa8dff0) dfa0: 7eb3455c 0000000c 00000003 00e74218 00000054 00000000 dfc0: 7eb3455c 0000000c 00000054 00000122 7eb3483c 00000001 00e74218 00000003 dfe0: 00000001 7eb344f0 0010b9d4 0010ba64 INFO: task syz-executor:10262 is blocked on a mutex likely owned by task kworker/u8:3:10025. task:kworker/u8:3 state:R running task stack:0 pid:10025 tgid:10025 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: netns cleanup_net Call trace: [<81b1e4fc>] (__schedule) from [<81b1fc24>] (preempt_schedule_common kernel/sched/core.c:7370 [inline]) [<81b1e4fc>] (__schedule) from [<81b1fc24>] (preempt_schedule+0x4c/0xb4 kernel/sched/core.c:7394) r10:85dd57e4 r9:85309504 r8:00000108 r7:8025a6c8 r6:00000001 r5:846bcb00 r4:8025a6c8 [<81b1fbd8>] (preempt_schedule) from [<8025a6c8>] (__local_bh_enable_ip+0x6c/0xd0 kernel/softirq.c:457) r7:e03d5c20 r6:00000000 r5:00000001 r4:846bcb00 [<8025a65c>] (__local_bh_enable_ip) from [<81b28c44>] (__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:196 [inline]) [<8025a65c>] (__local_bh_enable_ip) from [<81b28c44>] (_raw_spin_unlock_bh+0x34/0x38 kernel/locking/spinlock.c:214) r5:00000000 r4:85cdcc00 [<81b28c10>] (_raw_spin_unlock_bh) from [<818f9f70>] (spin_unlock_bh include/linux/spinlock.h:396 [inline]) [<81b28c10>] (_raw_spin_unlock_bh) from [<818f9f70>] (addrconf_ifdown+0x150/0x768 net/ipv6/addrconf.c:3921) [<818f9e20>] (addrconf_ifdown) from [<819007bc>] (addrconf_notify+0x60/0x8d0 net/ipv6/addrconf.c:3790) r10:00000006 r9:00000000 r8:e03d5da4 r7:85dd5000 r6:00000006 r5:85cdcc00 r4:85d20000 [<8190075c>] (addrconf_notify) from [<80285f14>] (notifier_call_chain+0x8c/0x220 kernel/notifier.c:85) r10:00000006 r9:00000000 r8:ffffffd1 r7:00000002 r6:82bf1698 r5:82bf23d0 r4:8190075c [<80285e88>] (notifier_call_chain) from [<8028618c>] (raw_notifier_call_chain+0x20/0x28 kernel/notifier.c:453) r10:8162e02c r9:00000000 r8:85d20648 r7:00000002 r6:85dd5000 r5:00000006 r4:e03d5da4 [<8028616c>] (raw_notifier_call_chain) from [<816226b4>] (call_netdevice_notifiers_info+0x54/0xa0 net/core/dev.c:2249) [<81622660>] (call_netdevice_notifiers_info) from [<8162ee54>] (call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]) [<81622660>] (call_netdevice_notifiers_info) from [<8162ee54>] (call_netdevice_notifiers net/core/dev.c:2301 [inline]) [<81622660>] (call_netdevice_notifiers_info) from [<8162ee54>] (unregister_netdevice_many_notify+0x600/0xc1c net/core/dev.c:12421) r6:00000180 r5:00000000 r4:85d20000 [<8162e854>] (unregister_netdevice_many_notify) from [<816302e4>] (unregister_netdevice_many net/core/dev.c:12484 [inline]) [<8162e854>] (unregister_netdevice_many_notify) from [<816302e4>] (default_device_exit_batch+0x304/0x384 net/core/dev.c:13076) r10:85dd5190 r9:85dd5000 r8:82e30c80 r7:e03d5e98 r6:85dd5190 r5:e03d5eb8 r4:85dd5094 [<8162ffe0>] (default_device_exit_batch) from [<8160f898>] (ops_exit_list net/core/net_namespace.c:205 [inline]) [<8162ffe0>] (default_device_exit_batch) from [<8160f898>] (ops_undo_list+0x10c/0x238 net/core/net_namespace.c:252) r10:00000001 r9:e03d5e58 r8:82bdec98 r7:82bdf2ac r6:82bdec98 r5:e03d5e98 r4:e03d5eb8 [<8160f78c>] (ops_undo_list) from [<8161207c>] (cleanup_net+0x208/0x358 net/core/net_namespace.c:702) r10:853b1000 r9:82bdec7c r8:00000cc0 r7:85dd5020 r6:e03d5eb8 r5:ffffffd4 r4:82e30c40 [<81611e74>] (cleanup_net) from [<80276084>] (process_one_work+0x1c8/0x5a0 kernel/workqueue.c:3314) r10:8302d215 r9:846bcb00 r8:02000000 r7:83012a00 r6:8302d200 r5:82bdec6c r4:85fb0180 [<80275ebc>] (process_one_work) from [<80276d50>] (process_scheduled_works kernel/workqueue.c:3397 [inline]) [<80275ebc>] (process_one_work) from [<80276d50>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3478) r10:00000000 r9:85fb01b0 r8:846bcb00 r7:82a03d80 r6:83012a20 r5:83012a00 r4:85fb0180 [<80276be4>] (worker_thread) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df931e88 r8:8bf85580 r7:85fb0180 r6:80276be4 r5:846bcb00 r4:8be10900 [<80281474>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe03d5fb0 to 0xe03d5ff8) 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 r5:80281474 r4:8be10900 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 r5:8231e1c4 r4:00000000 [<80201af0>] (show_stack) from [<8021e37c>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201af0>] (show_stack) from [<8021e37c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e320>] (dump_stack_lvl) from [<8021e3a8>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00000013 r5:00000001 r4:00000001 [<8021e390>] (dump_stack) from [<81b07dd4>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113) [<81b07c84>] (nmi_cpu_backtrace) from [<81b07f24>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:82a0b550 r5:82a1a2b8 r4:ffffffff [<81b07df4>] (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 r5:00007f3e r4:00000048 [<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0fa70>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]) [<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0fa70>] (__sys_info lib/sys_info.c:157 [inline]) [<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0fa70>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81b0fa08>] (sys_info) from [<8038acf0>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81b0fa08>] (sys_info) from [<8038acf0>] (watchdog+0x3ac/0x858 kernel/hung_task.c:561) r5:00007f3e r4:00000002 [<8038a944>] (watchdog) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e58 r8:83352680 r7:00000000 r6:8038a944 r5:833a0c80 r4:831f7480 [<80281474>] (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 r5:80281474 r4:831f7480 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2823 Comm: pr/ttyAMA-1 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at ip_rcv+0x0/0xec net/ipv4/ip_input.c:605 LR is at __netif_receive_skb_one_core+0x60/0x84 net/core/dev.c:6202 pc : [<817ea3d4>] lr : [<81628a88>] psr: a0000113 sp : df801dc8 ip : 85f7311c fp : df801dec r10: dddd2560 r9 : dddd2448 r8 : 00000040 r7 : 00000000 r6 : 00000000 r5 : 817ea3d4 r4 : 85f73000 r3 : 85f73000 r2 : 82a171bc r1 : 85f73000 r0 : 86115180 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85133c40 DAC: fffffffd Call trace: frame pointer underflow [<81628a28>] (__netif_receive_skb_one_core) from [<81628af4>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:6315) r5:0000003a r4:86115180 [<81628adc>] (__netif_receive_skb) from [<81628e50>] (process_backlog+0xa0/0x17c net/core/dev.c:6666) r5:0000003a r4:86115180 [<81628db0>] (process_backlog) from [<8162963c>] (__napi_poll+0x34/0x270 net/core/dev.c:7733) r10:df801e98 r9:00000000 r8:0000012c r7:00000040 r6:df801e93 r5:dddd2560 r4:00000001 [<81629608>] (__napi_poll) from [<81629bd4>] (napi_poll net/core/dev.c:7796 [inline]) [<81629608>] (__napi_poll) from [<81629bd4>] (net_rx_action+0x35c/0x3e8 net/core/dev.c:7953) r9:00000000 r8:0000012c r7:dddd2560 r6:dddd2564 r5:dddd2440 r4:ffffffff [<81629878>] (net_rx_action) from [<80259fd0>] (handle_softirqs+0x160/0x4f4 kernel/softirq.c:622) r10:8524be80 r9:00000082 r8:00000101 r7:0000000c r6:00000002 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 r9:8524be80 r8:00000000 r7:eb2e5e78 r6:824ce08c r5:825092b4 r4:8524be80 [<8025a3b0>] (__irq_exit_rcu) from [<8025a838>] (irq_exit+0x10/0x18 kernel/softirq.c:764) r5:825092b4 r4:828d1e6c [<8025a828>] (irq_exit) from [<81b1ab80>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:293) [<81b1ab04>] (generic_handle_arch_irq) from [<81ae7a20>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40) r9:8524be80 r8:00000000 r7:eb2e5eac r6:ffffffff r5:60000013 r4:81b28d90 [<81ae7a04>] (call_with_stack) from [<80200bec>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:228) Exception stack(0xeb2e5e78 to 0xeb2e5ec0) 5e60: 8448b840 60000013 5e80: 00000000 00001858 00000001 00000000 82b58b58 00000117 00000000 00000000 5ea0: 82b58bf4 eb2e5ed4 eb2e5ed8 eb2e5ec8 80ae2304 81b28d90 60000013 ffffffff [<81b28d68>] (_raw_spin_unlock_irqrestore) from [<80ae2304>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]) [<81b28d68>] (_raw_spin_unlock_irqrestore) from [<80ae2304>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]) [<81b28d68>] (_raw_spin_unlock_irqrestore) from [<80ae2304>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2668) [<80ae22e4>] (pl011_console_device_unlock) from [<802e8b28>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165) [<802e8aa0>] (nbcon_emit_one) from [<802e8da8>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271) r6:82cbf2d4 r5:82b58b58 r4:8524be80 [<802e8ba0>] (nbcon_kthread_func) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df92db38 r8:84c1f980 r7:82b58b58 r6:802e8ba0 r5:8524be80 r4:84c33300 [<80281474>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeb2e5fb0 to 0xeb2e5ff8) 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 r5:80281474 r4:84c33300