INFO: task systemd-udevd:26007 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:28568 pid:26007 ppid: 2988 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 del_gendisk+0x84/0x730 block/genhd.c:598 nbd_dev_remove drivers/block/nbd.c:241 [inline] nbd_put.part.0+0x82/0x160 drivers/block/nbd.c:263 nbd_put drivers/block/nbd.c:1527 [inline] nbd_release+0x14d/0x1a0 drivers/block/nbd.c:1526 blkdev_put_whole fs/block_dev.c:1096 [inline] blkdev_put+0x2fb/0x9e0 fs/block_dev.c:1387 blkdev_close+0x8c/0xb0 fs/block_dev.c:1397 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe25507b270 RSP: 002b:00007ffd6f0ac1a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fe25507b270 RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fe255f35710 R08: 0000000000000045 R09: 0000000000000018 R10: 000055a799b73898 R11: 0000000000000246 R12: 0000000000000000 R13: 000055a799b5f5c0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.3:26055 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:28600 pid:26055 ppid: 30812 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 nbd_genl_connect+0x1fb/0x1820 drivers/block/nbd.c:1826 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f87ae556188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff8ba72a0f R14: 00007f87ae556300 R15: 0000000000022000 INFO: task syz-executor.3:26055 blocked for more than 144 seconds. Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28600 pid:26055 ppid: 30812 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 nbd_genl_connect+0x1fb/0x1820 drivers/block/nbd.c:1826 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f87ae556188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff8ba72a0f R14: 00007f87ae556300 R15: 0000000000022000 INFO: task syz-executor.1:26063 can't die for more than 144 seconds. task:syz-executor.1 state:D stack:28808 pid:26063 ppid: 20590 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:790 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2030 __do_sys_sendto net/socket.c:2042 [inline] __se_sys_sendto net/socket.c:2038 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2038 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41957c RSP: 002b:00007f868438f020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f868438f110 RCX: 000000000041957c RDX: 000000000000001c RSI: 00007f868438f160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f868438f074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007f868438f0c8 R13: 00007f868438f160 R14: 0000000000000004 R15: 0000000000000000 INFO: task syz-executor.1:26063 blocked for more than 145 seconds. Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28808 pid:26063 ppid: 20590 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:790 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2030 __do_sys_sendto net/socket.c:2042 [inline] __se_sys_sendto net/socket.c:2038 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2038 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41957c RSP: 002b:00007f868438f020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f868438f110 RCX: 000000000041957c RDX: 000000000000001c RSI: 00007f868438f160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f868438f074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007f868438f0c8 R13: 00007f868438f160 R14: 0000000000000004 R15: 0000000000000000 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553