INFO: task syz-executor.0:7549 blocked for more than 143 seconds. Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:7549 tgid:7548 ppid:6199 flags:0x0000000d Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5400 [inline] __schedule+0x1498/0x24b4 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xb8/0x19c kernel/sched/core.c:6817 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2159 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95 __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:148 __flush_workqueue+0x580/0x11c4 kernel/workqueue.c:3198 nbd_start_device_ioctl drivers/block/nbd.c:1443 [inline] __nbd_ioctl drivers/block/nbd.c:1504 [inline] nbd_ioctl+0x8cc/0xc38 drivers/block/nbd.c:1544 blkdev_ioctl+0x3e4/0xae4 block/ioctl.c:634 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffff80008ee74ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:297 2 locks held by kworker/u5:1/5741: #0: ffff0000ca27cd38 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff80009bb87c20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 2 locks held by getty/5920: #0: ffff0000c19070a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800094f722f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201 4 locks held by syz-executor.3/6210: #0: ffff0000d7a50420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000db711800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline] #1: ffff0000db711800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3895 #2: ffff80008ee74ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:297 #3: ffff80008ec24648 (rename_lock.seqcount){+.+.}-{0:0}, at: read_seqbegin include/linux/seqlock.h:772 [inline] #3: ffff80008ec24648 (rename_lock.seqcount){+.+.}-{0:0}, at: read_seqbegin_or_lock include/linux/seqlock.h:1076 [inline] #3: ffff80008ec24648 (rename_lock.seqcount){+.+.}-{0:0}, at: prepend_path+0x2a8/0xaf8 fs/d_path.c:171 3 locks held by syz-executor.4/6212: #0: ffff0000d7a50420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000d7a50610 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1641 [inline] #1: ffff0000d7a50610 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1824 [inline] #1: ffff0000d7a50610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b0/0x10d8 fs/ext4/inode.c:212 #2: ffff0000df3e7200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #2: ffff0000df3e7200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd8/0x508 fs/namei.c:4327 2 locks held by syz-executor.1/15214: 3 locks held by syz-executor.0/15216: #0: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:559 [inline] #0: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1385 [inline] #0: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1699 [inline] #0: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2e0/0x24b4 kernel/sched/core.c:6643 #1: ffff0001b3fffc88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3c0/0x618 kernel/sched/psi.c:988 #2: ffff0001b3fffc88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_change+0x100/0x234 kernel/sched/psi.c:912 1 lock held by syz-executor.0/15217: 3 locks held by syz-executor.2/15218: #0: ffff0000d7a50420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000df3e3600 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline] #1: ffff0000df3e3600 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3895 #2: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:559 [inline] #2: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1385 [inline] #2: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1699 [inline] #2: ffff0001b4013f58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2e0/0x24b4 kernel/sched/core.c:6643 =============================================