INFO: task syz-executor.0:6993 blocked for more than 143 second INFO: task syz-executor.0:6993 blocked for more than 143 seconds. Not tainted 6.15.0-rc7-syzkaller-00085-gd7fa1af5b33e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:6993 tgid:6992 ppid:6710 task_flags:0x400140 flags:0x00000019 Call trace: __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6860 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6917 __mutex_lock_common+0xbd0/0x2190 kernel/locking/mutex.c:678 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 nbd_start_device_ioctl drivers/block/nbd.c:1542 [inline] __nbd_ioctl drivers/block/nbd.c:1602 [inline] nbd_ioctl+0x8f4/0xc4c drivers/block/nbd.c:1642 blkdev_ioctl+0x610/0xac0 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 INFO: task syz-executor.0:6995 blocked for more than 143 seconds. Not tainted 6.15.0-rc7-syzkaller-00085-gd7fa1af5b33e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:6995 tgid:6992 ppid:6710 task_flags:0x480140 flags:0x00000019 Call trace: __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6860 blk_mq_freeze_queue_wait+0xe0/0x158 block/blk-mq.c:200 blk_mq_freeze_queue_nomemsave+0xe8/0x13c block/blk-mq.c:216 blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline] nbd_add_socket+0x188/0x7a8 drivers/block/nbd.c:1251 __nbd_ioctl drivers/block/nbd.c:1585 [inline] nbd_ioctl+0x4a0/0xc4c drivers/block/nbd.c:1642 blkdev_ioctl+0x610/0xac0 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff80008f508920 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by pr/ttyAMA0/46: 1 lock held by klogd/6096: 2 locks held by getty/6262: #0: ffff0000d30830a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b5eb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa0 drivers/tty/n_tty.c:2222 1 lock held by udevd/6712: #0: ffff0000ca4c3358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945 1 lock held by syz-executor.0/6993: #0: ffff0000c958e998 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_start_device_ioctl drivers/block/nbd.c:1542 [inline] #0: ffff0000c958e998 (&nbd->config_lock){+.+.}-{4:4}, at: __nbd_ioctl drivers/block/nbd.c:1602 [inline] #0: ffff0000c958e998 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x8f4/0xc4c drivers/block/nbd.c:1642 3 locks held by syz-executor.0/6995: #0: ffff0000c958e998 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x124/0xc4c drivers/block/nbd.c:1635 #1: ffff0000ca4b1dd0 (&q->q_usage_counter(io)#33){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline] #1: ffff0000ca4b1dd0 (&q->q_usage_counter(io)#33){++++}-{0:0}, at: nbd_add_socket+0x188/0x7a8 drivers/block/nbd.c:1251 #2: ffff0000ca4b1e08 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline] #2: ffff0000ca4b1e08 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: nbd_add_socket+0x188/0x7a8 drivers/block/nbd.c:1251 1 lock held by syz-executor.0/7016: #0: ffff0000ca4c3358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945 1 lock held by syz-executor.0/7017: #0: ffff0000ca4c3358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945 1 lock held by syz-executor.0/7039: #0: ffff0000ca4c3358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945 1 lock held by syz-executor.0/7040: #0: ffff0000ca4c3358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945 =============================================