INFO: task syz.0.43:6720 blocked for more than 145 seconds. Not tainted 6.14.0-rc6-syzkaller-g0a6021b3fc20 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.43 state:D stack:0 pid:6720 tgid:6719 ppid:6448 task_flags:0x400140 flags:0x00000001 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5378 [inline] __schedule+0x1360/0x257c kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6857 percpu_rwsem_wait+0x288/0x3cc kernel/locking/percpu-rwsem.c:162 __percpu_down_read+0x7c/0xac kernel/locking/percpu-rwsem.c:177 percpu_down_read include/linux/percpu-rwsem.h:65 [inline] __sb_start_write include/linux/fs.h:1785 [inline] sb_start_write+0x24c/0x2ec include/linux/fs.h:1921 mnt_want_write+0x44/0x9c fs/namespace.c:547 open_last_lookups fs/namei.c:3739 [inline] path_openat+0x618/0x2b1c fs/namei.c:3986 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 INFO: task syz.0.43:6726 blocked for more than 145 seconds. Not tainted 6.14.0-rc6-syzkaller-g0a6021b3fc20 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.43 state:D stack:0 pid:6726 tgid:6719 ppid:6448 task_flags:0x400040 flags:0x00000001 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5378 [inline] __schedule+0x1360/0x257c kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6857 percpu_rwsem_wait+0x288/0x3cc kernel/locking/percpu-rwsem.c:162 __percpu_down_read+0x7c/0xac kernel/locking/percpu-rwsem.c:177 percpu_down_read include/linux/percpu-rwsem.h:65 [inline] __sb_start_write include/linux/fs.h:1785 [inline] sb_start_write+0x24c/0x2ec include/linux/fs.h:1921 mnt_want_write+0x44/0x9c fs/namespace.c:547 filename_create+0x148/0x468 fs/namei.c:4075 do_mkdirat+0xac/0x584 fs/namei.c:4328 __do_sys_mkdirat fs/namei.c:4351 [inline] __se_sys_mkdirat fs/namei.c:4349 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4349 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by rcu_exp_gp_kthr/20: 1 lock held by khungtaskd/32: #0: ffff80008fda22e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 3 locks held by kworker/u8:3/45: #0: ffff0000d27f0148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3212 #1: ffff8000993c7ba0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3212 #2: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 4 locks held by kworker/u8:6/687: #0: ffff0000c187a148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3212 #1: ffff80009dae7ba0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3212 #2: ffff800092b65b10 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x148/0xa48 net/core/net_namespace.c:606 #3: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by dhcpcd/6112: #0: ffff0000d7b416c8 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xf8/0x720 net/netlink/af_netlink.c:2387 #1: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x8c/0x1d0 net/core/rtnetlink.c:6780 2 locks held by getty/6195: #0: ffff0000d2eae0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009bcdb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 2 locks held by kworker/1:6/6523: #0: ffff0000c0028d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3212 #1: ffff8000a4347ba0 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3212 1 lock held by syz.0.43/6720: #0: ffff0000f0e76420 (sb_writers#15){++++}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:547 1 lock held by syz.0.43/6726: #0: ffff0000f0e76420 (sb_writers#15){++++}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:547 3 locks held by kworker/u8:14/7484: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3212 #1: ffff80009dad7ba0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3212 #2: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by syz-executor/9141: #0: ffff80008fbde510 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:163 #1: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] #1: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xaf8/0x1844 net/core/rtnetlink.c:4021 1 lock held by syz-executor/9147: #0: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] #0: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xaf8/0x1844 net/core/rtnetlink.c:4021 1 lock held by syz.4.766/9335: #0: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by syz.2.768/9340: #0: ffff800092b722a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 #1: ffff80008fda77f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline] #1: ffff80008fda77f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x354/0x674 kernel/rcu/tree_exp.h:996 =============================================