INFO: task syz-executor.1:22573 blocked for more than 143 seconds. Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:0 pid:22573 ppid:22558 flags:0x00000001 Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5307 [inline] __schedule+0x103c/0x1e2c kernel/sched/core.c:6625 schedule+0xc4/0x170 kernel/sched/core.c:6701 blk_mq_freeze_queue_wait+0xf4/0x174 block/blk-mq.c:180 blk_freeze_queue+0xc8/0x104 block/blk-mq.c:207 blk_mq_freeze_queue+0x20/0x30 block/blk-mq.c:216 nbd_add_socket+0x154/0x76c drivers/block/nbd.c:1122 __nbd_ioctl drivers/block/nbd.c:1465 [inline] nbd_ioctl+0x20c/0xc40 drivers/block/nbd.c:1522 blkdev_ioctl+0x408/0xb40 block/ioctl.c:615 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 INFO: task syz-executor.1:22574 blocked for more than 143 seconds. Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:0 pid:22574 ppid:22558 flags:0x00000001 Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5307 [inline] __schedule+0x103c/0x1e2c kernel/sched/core.c:6625 schedule+0xc4/0x170 kernel/sched/core.c:6701 __bio_queue_enter+0x22c/0x554 block/blk-core.c:360 bio_queue_enter block/blk.h:71 [inline] blk_mq_get_new_requests block/blk-mq.c:2848 [inline] blk_mq_submit_bio+0xa24/0x1d20 block/blk-mq.c:2958 __submit_bio+0x214/0x2a0 block/blk-core.c:602 __submit_bio_noacct_mq block/blk-core.c:679 [inline] submit_bio_noacct_nocheck+0x770/0xb60 block/blk-core.c:708 submit_bio_noacct+0xce0/0x1648 block/blk-core.c:807 submit_bio+0x274/0x3d8 block/blk-core.c:843 submit_bio_wait+0x108/0x210 block/bio.c:1371 blkdev_issue_flush+0xb8/0x104 block/blk-flush.c:467 blkdev_fsync+0x7c/0xac block/fops.c:466 vfs_fsync_range fs/sync.c:188 [inline] vfs_fsync fs/sync.c:202 [inline] do_fsync fs/sync.c:212 [inline] __do_sys_fsync fs/sync.c:220 [inline] __se_sys_fsync fs/sync.c:218 [inline] __arm64_sys_fsync+0x178/0x1c0 fs/sync.c:218 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015f3f4d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/13: #0: ffff800015f3fcd0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/28: #0: ffff800015f3f300 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:326 1 lock held by klogd/5535: 2 locks held by getty/5686: #0: ffff0000d43e7098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001acd02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2177 2 locks held by kworker/u4:2/19953: 1 lock held by syz-executor.1/22573: #0: ffff0000cc9ff998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/22628: #0: ffff0000cc9ff998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/22697: #0: ffff0000cc9ff998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/22698: #0: ffff0000cc9ff998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/22699: #0: ffff0000cc9ff998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/22700: #0: ffff0000cc9ff998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 =============================================