INFO: task syz.5.308:7935 blocked for more than 143 seconds. Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.308 state:D stack:0 pid:7935 tgid:7934 ppid:7471 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 io_schedule+0x84/0xf0 kernel/sched/core.c:7742 folio_wait_bit_common+0x56c/0x9e0 mm/filemap.c:1317 __folio_lock+0x2c/0x3c mm/filemap.c:1664 folio_lock include/linux/pagemap.h:1137 [inline] migrate_folio_unmap mm/migrate.c:1242 [inline] migrate_pages_batch+0xb84/0x236c mm/migrate.c:1866 migrate_pages_sync mm/migrate.c:2016 [inline] migrate_pages+0x1ea8/0x2864 mm/migrate.c:2098 compact_zone+0x2aac/0x41f0 mm/compaction.c:2689 compact_node mm/compaction.c:2958 [inline] compact_nodes mm/compaction.c:2980 [inline] sysctl_compaction_handler+0x37c/0x5e4 mm/compaction.c:3031 proc_sys_call_handler+0x460/0x7e8 fs/proc/proc_sysctl.c:601 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:627 iter_file_splice_write+0x718/0xca4 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0xec/0x14c fs/splice.c:1158 splice_direct_to_actor+0x414/0x994 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x130/0x210 fs/splice.c:1227 do_sendfile+0x3cc/0x658 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1423 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __arm64_sys_sendfile64+0x128/0x274 fs/read_write.c:1415 __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: 3 locks held by kworker/0:1/10: #0: ffff0000c0028d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff800097637bc0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 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 kworker/u8:8/671: 3 locks held by kworker/1:2/2299: #0: ffff0000c0028d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff8000a0af7bc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff0000fa7a7240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1cc/0x25b8 drivers/net/netdevsim/fib.c:1490 3 locks held by kworker/1:3/2315: 5 locks held by kworker/u8:9/2629: 2 locks held by dhcpcd/6161: #0: ffff800092473368 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x5b4/0x84c net/socket.c:1273 #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by getty/6258: #0: ffff0000d269d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b61b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa0 drivers/tty/n_tty.c:2222 1 lock held by udevd/6512: #0: ffff0000ca6db358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:945 2 locks held by kworker/0:5/6575: 3 locks held by kworker/u8:12/7860: 1 lock held by syz.5.308/7935: #0: ffff0000cec70420 (sb_writers#4){.+.+}-{0:0}, at: direct_splice_actor+0x54/0x14c fs/splice.c:1157 1 lock held by syz-executor/8159: #0: ffff8000 #0: ffff80008f50e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline] #0: ffff80008f50e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x338/0x624 kernel/rcu/tree_exp.h:998 3 locks held by kworker/u8:13/9005: #0: ffff0000d1f30148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff80009c117bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by syz-executor/10156: #0: ffff0000f26e0d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline] #0: ffff0000f26e0d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x1e8/0x4a8 net/bluetooth/hci_core.c:2678 #1: ffff0000f26e0078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x4c4/0x1154 net/bluetooth/hci_sync.c:5213 2 locks held by syz-executor/10391: #0: ffff80008f33fac0 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:160 #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x710/0x15dc net/core/rtnetlink.c:4064 2 locks held by syz.4.729/10415: #0: ffff800092481e50 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x288/0x4a4 net/core/net_namespace.c:514 #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4} , at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 =============================================