INFO: task syz.3.957:9205 blocked for more than 143 seconds. Not tainted 5.15.173-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.957 state:D stack:27744 pid: 9205 ppid: 6384 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 d_wait_lookup+0x1f0/0x2c0 fs/dcache.c:2569 d_alloc_parallel+0xa5e/0x1390 fs/dcache.c:2651 __lookup_slow+0x111/0x3d0 fs/namei.c:1648 lookup_slow+0x53/0x70 fs/namei.c:1680 walk_component+0x48c/0x610 fs/namei.c:1976 lookup_last fs/namei.c:2431 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2455 filename_lookup+0x230/0x5c0 fs/namei.c:2484 user_path_at_empty+0x40/0x180 fs/namei.c:2883 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x106/0x3b0 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat fs/stat.c:405 [inline] __x64_sys_newfstatat+0x12c/0x1b0 fs/stat.c:405 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f432d117809 RSP: 002b:00007f432af6c058 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 00007f432d2dd080 RCX: 00007f432d117809 RDX: 00000000200001c0 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 00007f432d18a93e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f432d2dd080 R15: 00007fff3e416dc8 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8cb1fc60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/u4:3/155: #0: ffff8881443ac938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90001fd7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffffffff96ae0d90 (&p->sequence){..-.}-{0:0}, at: fprop_fraction_percpu+0x6b/0x200 lib/flex_proportions.c:235 2 locks held by getty/3930: #0: ffff88814c77b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc90002ce32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158 3 locks held by kworker/u5:3/4186: #0: ffff888020230938 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90002eefd20 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffff888068cd8ff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0xa4/0x1330 net/bluetooth/hci_core.c:1446 2 locks held by syz-executor/5385: #0: ffff888020bc4518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff888147368468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa9/0xbe0 drivers/block/loop.c:1365 3 locks held by kworker/u4:15/6426: #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc900032afd20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffffffff8dc41388 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251 2 locks held by kworker/u4:21/7401: 2 locks held by kworker/1:10/8702: #0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90002e4fd20 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 1 lock held by syz.3.957/9198: 1 lock held by syz.3.957/9205: #0: ffff888056754188 (&type->i_mutex_dir_key#21){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:799 [inline] #0: ffff888056754188 (&type->i_mutex_dir_key#21){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1679 2 locks held by syz-executor/9413: #0: ffff888020bba118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff8881472f9468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa9/0xbe0 drivers/block/loop.c:1365 2 locks held by syz-executor/10050: #0: ffff888020bc7d18 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff88814736e468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa9/0xbe0 drivers/block/loop.c:1365 2 locks held by syz.0.1276/10818: #0: ffffffff8dc41388 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:699 [inline] #0: ffffffff8dc41388 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x1b0 drivers/net/tun.c:3440 #1: ffffffff8cb24228 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8cb24228 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x280/0x740 kernel/rcu/tree_exp.h:845 2 locks held by dhcpcd-run-hook/10839: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xe72/0xeb0 kernel/hung_task.c:295 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4176 Comm: syz-executor Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:lookup_object lib/debugobjects.c:199 [inline] RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:568 [inline] RIP: 0010:__debug_object_init+0x113/0xd30 lib/debugobjects.c:621 Code: 89 f7 e8 c0 21 b2 fd 4d 8b 3e 45 31 e4 eb 06 4d 8b 3f 41 ff c4 4d 85 ff 74 40 49 8d 5f 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 93 21 b2 fd 48 8b 44 24 30 48 39 03 0f 84 e7 00 RSP: 0018:ffffc90002e5fae0 EFLAGS: 00000046 RAX: 1ffff1100c36a506 RBX: ffff888061b52830 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90002e5f9c0 RBP: ffffc90002e5fcc0 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000001 R13: dffffc0000000000 R14: ffffffff96cfa9b8 R15: ffff888061b52818 FS: 000055558b076500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558b0915c8 CR3: 000000006434a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_timer_init kernel/time/timer.c:724 [inline] debug_init kernel/time/timer.c:772 [inline] init_timer_key+0x3e/0x2d0 kernel/time/timer.c:816 sock_init_data_uid+0x71/0xbc0 net/core/sock.c:3160 inet_create+0x7ca/0xd40 net/ipv4/af_inet.c:351 __sock_create+0x460/0x8f0 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0x132/0x370 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f2180ef0727 Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4b9e4408 EFLAGS: 00000202 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f21810782e0 RCX: 00007f2180ef0727 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 00007fff4b9e4b1c R08: 0000000000000000 R09: 00007fff4b9e4837 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032 R13: 00000000000d3177 R14: 0000000000000000 R15: 00007fff4b9e4b70