syzbot

INFO: task syz-executor.3:19866 blocked for more than 143 seconds.
      Not tainted 6.1.54-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:0     pid:19866 ppid:4269   flags:0x0000000d
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0xee4/0x1c98 kernel/sched/core.c:6554
 schedule+0xc4/0x170 kernel/sched/core.c:6630
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6689
 rwsem_down_read_slowpath+0x534/0x858 kernel/locking/rwsem.c:1094
 __down_read_common kernel/locking/rwsem.c:1261 [inline]
 __down_read kernel/locking/rwsem.c:1274 [inline]
 down_read+0xac/0x308 kernel/locking/rwsem.c:1522
 iterate_supers+0xb0/0x1dc fs/super.c:744
 drop_caches_sysctl_handler+0xac/0x394 fs/drop_caches.c:62
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:604
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:630
 do_iter_write+0x534/0x964 fs/read_write.c:861
 vfs_iter_write+0x88/0xac fs/read_write.c:902
 iter_file_splice_write+0x618/0xc48 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0xe4/0x1c0 fs/splice.c:931
 splice_direct_to_actor+0x3c4/0x944 fs/splice.c:886
 do_splice_direct+0x1f4/0x334 fs/splice.c:974
 do_sendfile+0x4bc/0xc70 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1309
 __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+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffff800015a84ef0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
 #0: ffff800015a856f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
 #0: ffff800015a84d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:305
1 lock held by klogd/3830:
 #0: ffff0001b4582598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:537 [inline]
 #0: ffff0001b4582598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1354 [inline]
 #0: ffff0001b4582598 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1644 [inline]
 #0: ffff0001b4582598 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2c4/0x1c98 kernel/sched/core.c:6471
2 locks held by getty/3978:
 #0: ffff0000d6489098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80001bd502f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2188
3 locks held by kworker/1:7/4340:
 #0: ffff0000c4652938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265
 #1: ffff80001edb7c20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267
 #2: ffff0000d1de8190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #2: ffff0000d1de8190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1ac/0x4354 drivers/usb/core/hub.c:5739
1 lock held by syz-executor.4/15355:
2 locks held by syz-executor.3/19866:
 #0: ffff0000d87d6460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x4a0/0xc70 fs/read_write.c:1254
 #1: ffff0000da6740e0 (&type->s_umount_key#59){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:744
1 lock held by syz-executor.5/23140:
 #0: ffff000129e0efe0 (&call->user_mutex){+.+.}-{3:3}, at: rxrpc_new_client_call+0x324/0xb78 net/rxrpc/call_object.c:312

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