INFO: task syz-executor.5:16485 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:27440 pid:16485 ppid: 8488 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6095 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 refcount_dec_and_mutex_lock lib/refcount.c:118 [inline] refcount_dec_and_mutex_lock+0x50/0x140 lib/refcount.c:113 nbd_put drivers/block/nbd.c:260 [inline] nbd_genl_connect+0xd69/0x1820 drivers/block/nbd.c:1999 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 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:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 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: 0033:0x4665d9 RSP: 002b:00007f33eea97188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffe3e08e47f R14: 00007f33eea97300 R15: 0000000000022000 INFO: task syz-executor.5:16485 blocked for more than 143 seconds. Tainted: G W 5.14.0-rc1-next-20210715-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27440 pid:16485 ppid: 8488 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6095 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 refcount_dec_and_mutex_lock lib/refcount.c:118 [inline] refcount_dec_and_mutex_lock+0x50/0x140 lib/refcount.c:113 nbd_put drivers/block/nbd.c:260 [inline] nbd_genl_connect+0xd69/0x1820 drivers/block/nbd.c:1999 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 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:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 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: 0033:0x4665d9 RSP: 002b:00007f33eea97188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffe3e08e47f R14: 00007f33eea97300 R15: 0000000000022000 INFO: task systemd-udevd:16498 blocked for more than 144 seconds. Tainted: G W 5.14.0-rc1-next-20210715-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:28600 pid:16498 ppid: 4877 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6095 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 del_gendisk+0x8b/0x770 block/genhd.c:587 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:1277 [inline] blkdev_put+0x34f/0xae0 fs/block_dev.c:1574 blkdev_close+0x8c/0xb0 fs/block_dev.c:1584 __fput+0x288/0x920 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: 0033:0x7f54530f9270 RSP: 002b:00007ffc39f43448 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f54530f9270 RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007f5453fb3710 R08: 000000000000004a R09: 0000000000000008 R10: 00005607c34a68a8 R11: 0000000000000246 R12: 0000000000000000 R13: 00005607c34ac6a0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.4:16509 can't die for more than 144 seconds. task:syz-executor.4 state:D stack:28832 pid:16509 ppid: 8486 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6095 __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:798 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 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:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 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: 0033:0x41956c RSP: 002b:00007f0c6082c020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0c6082c110 RCX: 000000000041956c RDX: 000000000000001c RSI: 00007f0c6082c160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f0c6082c074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007f0c6082c0c8 R13: 00007f0c6082c160 R14: 0000000000000004 R15: 0000000000000000 INFO: task syz-executor.4:16509 blocked for more than 145 seconds. Tainted: G W 5.14.0-rc1-next-20210715-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28832 pid:16509 ppid: 8486 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6095 __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:798 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 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:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 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: 0033:0x41956c RSP: 002b:00007f0c6082c020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0c6082c110 RCX: 000000000041956c RDX: 000000000000001c RSI: 00007f0c6082c160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f0c6082c074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007f0c6082c0c8 R13: 00007f0c6082c160 R14: 0000000000000004 R15: 0000000000000000 INFO: task systemd-udevd:16512 blocked for more than 145 seconds. Tainted: G W 5.14.0-rc1-next-20210715-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:28504 pid:16512 ppid: 4877 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6095 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 nbd_open+0x7d/0x8a0 drivers/block/nbd.c:1479 blkdev_get_whole+0xa1/0x420 fs/block_dev.c:1251 blkdev_get_by_dev.part.0+0x30c/0xdd0 fs/block_dev.c:1415 blkdev_get_by_dev fs/block_dev.c:1504 [inline] blkdev_open+0x295/0x300 fs/block_dev.c:1510 do_dentry_open+0x4c8/0x11d0 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x1c23/0x27f0 fs/namei.c:3507 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_open fs/open.c:1228 [inline] __se_sys_open fs/open.c:1224 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1224 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: 0033:0x7f54530f9840 RSP: 002b:00007ffc39f42e78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00005607c34ac190 RCX: 00007f54530f9840 RDX: 00005607c2b91fe3 RSI: 00000000000a0800 RDI: 00005607c34a9f90 RBP: 00007ffc39f42ff0 R08: 00005607c2b91670 R09: 0000000000000010 R10: 00005607c2b91d0c R11: 0000000000000246 R12: 00007ffc39f42f40 R13: 00005607c34980e0 R14: 0000000000000003 R15: 000000000000000e INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1643 Comm: khungtaskd Tainted: G W 5.14.0-rc1-next-20210715-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:105 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:254 [inline] watchdog+0xd3e/0xf50 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 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553