INFO: task kworker/u8:11:6528 blocked for more than 143 seconds. Not tainted 6.8.0-rc4-next-20240214-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:11 state:D stack:22584 pid:6528 tgid:6528 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17df/0x4a40 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6804 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6819 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6876 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4689 process_one_work kernel/workqueue.c:3146 [inline] process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226 worker_thread+0x86d/0xd70 kernel/workqueue.c:3307 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 INFO: task syz-executor.0:12709 blocked for more than 145 seconds. Not tainted 6.8.0-rc4-next-20240214-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26768 pid:12709 tgid:12708 ppid:6952 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17df/0x4a40 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6804 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6819 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6876 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3c/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7ff653e7dda9 RSP: 002b:00007ff654c830c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff653fabf80 RCX: 00007ff653e7dda9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 00007ff653eca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007ff653fabf80 R15: 00007ffd8dd7aa08 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e1315a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e1315a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e1315a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 1 lock held by dhcpcd/4736: #0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606 2 locks held by getty/4825: #0: ffff888029f970a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 3 locks held by syz-fuzzer/5063: #0: ffff888049326848 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191 #1: ffff88804cced400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103 #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2466 [inline] #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: iterate_dir+0x5df/0x6f0 fs/readdir.c:113 3 locks held by syz-fuzzer/5092: #0: ffff888018f18348 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191 #1: ffff88804cc72200 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103 #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2466 [inline] #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: iterate_dir+0x5df/0x6f0 fs/readdir.c:113 3 locks held by syz-fuzzer/5182: #0: ffff88805c3ef4c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191 #1: ffff88804c54a200 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103 #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2466 [inline] #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: iterate_dir+0x5df/0x6f0 fs/readdir.c:113 3 locks held by syz-fuzzer/5191: #0: ffff88805c3efc48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191 #1: ffff88804c548400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103 #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2466 [inline] #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: iterate_dir+0x5df/0x6f0 fs/readdir.c:113 3 locks held by kworker/u8:11/6528: #0: ffff888029ace948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline] #0: ffff888029ace948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226 #1: ffffc90012abfd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline] #1: ffffc90012abfd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226 #2: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4689 3 locks held by kworker/0:13/18679: 4 locks held by kworker/u8:5/5220: #0: ffff888015ad5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline] #0: ffff888015ad5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226 #1: ffffc9000b1d7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline] #1: ffffc9000b1d7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226 #2: ffffffff8f37aed0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:591 #3: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: mpls_net_exit+0x7d/0x2a0 net/mpls/af_mpls.c:2723 3 locks held by syz-executor.3/6689: #0: ffff88802d6f1248 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191 #1: ffff888065e91800 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103 #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2466 [inline] #2: ffff88807d11e420 (sb_writers#4){.+.+}-{0:0}, at: iterate_dir+0x5df/0x6f0 fs/readdir.c:113 1 lock held by syz-executor.0/8566: #0: ffff88807d11e610 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1671 [inline] #0: ffff88807d11e610 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1854 [inline] #0: ffff88807d11e610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2e4/0xf30 fs/ext4/inode.c:212