INFO: task syz-executor.0:19623 blocked for more than 430 seconds. Not tainted 5.15.0-syzkaller-12999-gc8c109546a19 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack: 0 pid:19623 ppid: 2202 flags:0x00400001 Call trace: __switch_to+0x264/0x3a4 arch/arm64/kernel/process.c:526 context_switch kernel/sched/core.c:4969 [inline] __schedule+0x868/0x1c14 kernel/sched/core.c:6250 schedule+0xfc/0x2fc kernel/sched/core.c:6323 blk_mq_freeze_queue_wait+0xf4/0x130 block/blk-mq.c:178 blk_freeze_queue block/blk-mq.c:205 [inline] blk_mq_freeze_queue+0x20/0x30 block/blk-mq.c:214 nbd_add_socket+0x134/0x690 drivers/block/nbd.c:1109 __nbd_ioctl drivers/block/nbd.c:1454 [inline] nbd_ioctl+0x430/0x8f4 drivers/block/nbd.c:1511 compat_blkdev_ioctl+0x774/0x9a0 block/ioctl.c:674 __do_compat_sys_ioctl fs/ioctl.c:972 [inline] __se_compat_sys_ioctl fs/ioctl.c:914 [inline] __arm64_compat_sys_ioctl+0x1d0/0x220 fs/ioctl.c:914 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc_compat+0x40/0x80 arch/arm64/kernel/syscall.c:187 el0_svc_compat+0x64/0x280 arch/arm64/kernel/entry-common.c:736 el0t_32_sync_handler+0x90/0x140 arch/arm64/kernel/entry-common.c:746 el0t_32_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:577 INFO: task syz-executor.0:19632 blocked for more than 430 seconds. Not tainted 5.15.0-syzkaller-12999-gc8c109546a19 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack: 0 pid:19632 ppid: 2202 flags:0x00400001 Call trace: __switch_to+0x264/0x3a4 arch/arm64/kernel/process.c:526 context_switch kernel/sched/core.c:4969 [inline] __schedule+0x868/0x1c14 kernel/sched/core.c:6250 schedule+0xfc/0x2fc kernel/sched/core.c:6323 schedule_preempt_disabled+0x78/0x104 kernel/sched/core.c:6382 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0x480/0x8fc kernel/locking/mutex.c:740 mutex_lock_nested+0x78/0x100 kernel/locking/mutex.c:792 nbd_ioctl+0x108/0x8f4 drivers/block/nbd.c:1504 compat_blkdev_ioctl+0x774/0x9a0 block/ioctl.c:674 __do_compat_sys_ioctl fs/ioctl.c:972 [inline] __se_compat_sys_ioctl fs/ioctl.c:914 [inline] __arm64_compat_sys_ioctl+0x1d0/0x220 fs/ioctl.c:914 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc_compat+0x40/0x80 arch/arm64/kernel/syscall.c:187 el0_svc_compat+0x64/0x280 arch/arm64/kernel/entry-common.c:736 el0t_32_sync_handler+0x90/0x140 arch/arm64/kernel/entry-common.c:746 el0t_32_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:577 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: __preempt_count_add arch/arm64/include/asm/preempt.h:48 [inline] #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: __rcu_read_lock include/linux/rcupdate.h:68 [inline] #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:686 [inline] #0: ffff800015f7f760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0xd4/0x368 kernel/locking/lockdep.c:6464 1 lock held by syslogd/1992: 2 locks held by getty/2156: #0: ffff00000c0fd098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001899b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x810/0xbe0 drivers/tty/n_tty.c:2113 1 lock held by syz-executor.1/8347: #0: ffff000035de1410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:783 [inline] #0: ffff000035de1410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release+0x68/0x214 net/socket.c:648 1 lock held by syz-executor.1/8707: #0: ffff000035de7a10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:783 [inline] #0: ffff000035de7a10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release+0x68/0x214 net/socket.c:648 1 lock held by syz-executor.1/9054: #0: ffff00002e2fca10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:783 [inline] #0: ffff00002e2fca10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release+0x68/0x214 net/socket.c:648 1 lock held by syz-executor.0/19623: #0: ffff0000109cb198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x108/0x8f4 drivers/block/nbd.c:1504 1 lock held by syz-executor.0/19632: #0: ffff0000109cb198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x108/0x8f4 drivers/block/nbd.c:1504 =============================================