INFO: task syz.2.18:5139 blocked for more than 143 seconds. Not tainted 6.1.137-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.18 state:D stack:29104 pid:5139 ppid:4979 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 rwsem_down_write_slowpath+0xbed/0x1090 kernel/locking/rwsem.c:1189 inode_lock_nested include/linux/fs.h:793 [inline] filename_create+0x1f2/0x450 fs/namei.c:3876 do_mkdirat+0x9d/0x430 fs/namei.c:4121 __do_sys_mkdir fs/namei.c:4151 [inline] __se_sys_mkdir fs/namei.c:4149 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4149 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5767985d29 RSP: 002b:00007f57686d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f5767b76080 RCX: 00007f5767985d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 00007f5767a01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f5767b76080 R15: 00007ffdb7a3d878 INFO: task syz.0.16:5172 blocked for more than 145 seconds. Not tainted 6.1.137-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.16 state:D stack:29120 pid:5172 ppid:4974 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 rwsem_down_write_slowpath+0xbed/0x1090 kernel/locking/rwsem.c:1189 inode_lock_nested include/linux/fs.h:793 [inline] filename_create+0x1f2/0x450 fs/namei.c:3876 do_mkdirat+0x9d/0x430 fs/namei.c:4121 __do_sys_mkdir fs/namei.c:4151 [inline] __se_sys_mkdir fs/namei.c:4149 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4149 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f87d1985d29 RSP: 002b:00007f87d2864038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f87d1b76080 RCX: 00007f87d1985d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 00007f87d1a01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f87d1b76080 R15: 00007fff702c2d68 INFO: task syz.3.19:5200 blocked for more than 146 seconds. Not tainted 6.1.137-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.19 state:D stack:29120 pid:5200 ppid:4988 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 rwsem_down_write_slowpath+0xbed/0x1090 kernel/locking/rwsem.c:1189 inode_lock_nested include/linux/fs.h:793 [inline] filename_create+0x1f2/0x450 fs/namei.c:3876 do_mkdirat+0x9d/0x430 fs/namei.c:4121 __do_sys_mkdir fs/namei.c:4151 [inline] __se_sys_mkdir fs/namei.c:4149 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4149 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fec26785d29 RSP: 002b:00007fec2763c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fec26976080 RCX: 00007fec26785d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 00007fec26801b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fec26976080 R15: 00007ffdbc794b58 Showing all locks held in the system: 3 locks held by kworker/0:0/7: #0: ffff888017070938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #1: ffffc900000c7d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #2: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:104 3 locks held by kworker/u4:1/11: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c927eb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c9286d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffffffff8c927520 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8c927520 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8c927520 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513 3 locks held by kworker/u4:3/51: #0: ffff888017079138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #1: ffffc90000bc7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #2: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263 1 lock held by kswapd0/83: 1 lock held by udevd/3624: 1 lock held by dhcpcd/3918: #0: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150 2 locks held by getty/4010: #0: ffff88803034e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ca/0x1a60 drivers/tty/n_tty.c:2198 2 locks held by kworker/0:4/4292: #0: ffff888017072138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #1: ffffc90003d37d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 3 locks held by kworker/0:9/4322: #0: ffff88802f975138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #1: ffffc90004217d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #2: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x14d0 net/ipv6/addrconf.c:4134 3 locks held by kworker/1:8/5123: #0: ffff88802f975138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #1: ffffc900035d7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #2: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x15/0x30 net/ipv6/addrconf.c:4675 2 locks held by syz.2.18/5137: 2 locks held by syz.2.18/5139: #0: ffff88807cd58460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff88805b34c188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88805b34c188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 2 locks held by syz.0.16/5169: 2 locks held by syz.0.16/5172: #0: ffff888073d9e460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff888053490188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff888053490188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 3 locks held by syz.3.19/5198: 2 locks held by syz.3.19/5200: #0: ffff88801dffe460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff88805b34c6d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88805b34c6d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 2 locks held by syz.1.17/5203: 2 locks held by syz.1.17/5205: #0: ffff88801fa42460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff88805b34cc18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88805b34cc18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 5 locks held by syz.4.20/5223: 2 locks held by syz.4.20/5224: #0: ffff88806ba20460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff8880534906d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff8880534906d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 2 locks held by syz.5.21/5491: 2 locks held by syz.5.21/5493: #0: ffff8880762e6460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff888053490c18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff888053490c18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 2 locks held by kworker/u4:7/5553: 5 locks held by kworker/u4:8/5557: #0: ffff888017216938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #1: ffffc900040b7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x78e/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dae6b50 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x132/0xb80 net/core/net_namespace.c:594 #3: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe5/0x9f0 net/core/dev.c:11477 #4: ffffffff8c92d1b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #4: ffffffff8c92d1b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962 3 locks held by syz.6.22/5562: 2 locks held by syz.6.22/5564: #0: ffff888029eb0460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff88805b34d160 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88805b34d160 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 2 locks held by syz.7.23/5614: 2 locks held by syz.7.23/5615: #0: ffff888020b56460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff88805b34d6a8 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88805b34d6a8 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 1 lock held by syz-executor/5617: #0: ffff88802f9d8d88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x5e/0x360 net/netfilter/x_tables.c:1242 3 locks held by syz.9.25/5639: 2 locks held by syz.9.25/5643: #0: ffff88815a440460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff88805b34dbf0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88805b34dbf0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 2 locks held by syz.8.24/5641: 2 locks held by syz.8.24/5648: #0: ffff888073030460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff888053491160 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff888053491160 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3876 1 lock held by syz-executor/6256: #0: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8daf30e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150