INFO: task syz-executor215:5071 blocked for more than 143 seconds. Not tainted 6.2.0-rc8-syzkaller-00151-g925cf0457d7e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor215 state:D stack:23616 pid:5071 ppid:5070 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5296 [inline] __schedule+0x1409/0x43f0 kernel/sched/core.c:6609 schedule+0xc3/0x190 kernel/sched/core.c:6685 io_schedule+0x8c/0x100 kernel/sched/core.c:8871 bit_wait_io+0x12/0xc0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0xbd/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0x1d4/0x250 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:397 [inline] __sync_dirty_buffer+0x120/0x380 fs/buffer.c:2732 __ext4_handle_dirty_metadata+0x2a6/0x820 fs/ext4/ext4_jbd2.c:387 ext4_handle_dirty_dirblock+0x362/0x6f0 fs/ext4/namei.c:438 ext4_finish_convert_inline_dir+0x57b/0x6f0 fs/ext4/inline.c:1181 ext4_convert_inline_data_nolock+0xa01/0xd80 fs/ext4/inline.c:1258 ext4_try_add_inline_entry+0x809/0xb70 fs/ext4/inline.c:1331 ext4_add_entry+0x535/0x1010 fs/ext4/namei.c:2385 ext4_mkdir+0x553/0xce0 fs/ext4/namei.c:3007 vfs_mkdir+0x3ba/0x590 fs/namei.c:4036 do_mkdirat+0x246/0x500 fs/namei.c:4061 __do_sys_mkdirat fs/namei.c:4076 [inline] __se_sys_mkdirat fs/namei.c:4074 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4074 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0687e28259 RSP: 002b:00007fff7cac8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f0687e28259 RDX: 0000000000000000 RSI: 0000000020000540 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f0687e96ec0 R09: 00007f0687e96ec0 R10: 00007f0687e96ec0 R11: 0000000000000246 R12: 00007fff7cac8190 R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cf25950 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xce0 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8cf26150 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xce0 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8cf25780 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4741: #0: ffff88802cd9b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2177 3 locks held by syz-executor215/5071: #0: ffff88807d1e8460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:508 #1: ffff88807757de48 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:791 [inline] #1: ffff88807757de48 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x25a/0x530 fs/namei.c:3807 #2: ffff88807757db10 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff88807757db10 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_add_inline_entry+0xf6/0xb70 fs/ext4/inline.c:1289 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc8-syzkaller-00151-g925cf0457d7e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e5/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b4/0x3f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xf70/0xfb0 kernel/hung_task.c:377 kthread+0x270/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 46 Comm: kworker/u4:3 Not tainted 6.2.0-rc8-syzkaller-00151-g925cf0457d7e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:mark_held_locks kernel/locking/lockdep.c:4236 [inline] RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:4254 [inline] RIP: 0010:lockdep_hardirqs_on_prepare+0x279/0x7a0 kernel/locking/lockdep.c:4321 Code: 89 e0 48 c1 e8 03 0f b6 04 10 84 c0 75 54 8b 43 20 a9 00 00 04 00 74 2c 31 d2 a9 00 00 03 00 0f 94 c2 83 f2 03 48 8b 7c 24 10 <48> 89 de e8 4f a2 00 00 48 ba 00 00 00 00 00 fc ff df 85 c0 0f 84 RSP: 0018:ffffc90000b777a0 EFLAGS: 00000002 RAX: 00000000000400b2 RBX: ffff88801780e220 RCX: ffffffff816b75da RDX: 0000000000000002 RSI: 0000000000000008 RDI: ffff88801780d7c0 RBP: ffffc90000b77848 R08: dffffc0000000000 R09: fffffbfff2038633 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801780e240 R13: 0000000000000001 R14: ffff88801780e1f0 R15: 1ffff11002f01c3e FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559a0ed54680 CR3: 000000000cc8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x38/0x50 kernel/trace/trace_preemptirq.c:49 __text_poke+0x7f8/0xa00 arch/x86/kernel/alternative.c:1646 text_poke arch/x86/kernel/alternative.c:1671 [inline] text_poke_bp_batch+0x650/0x850 arch/x86/kernel/alternative.c:2027 text_poke_flush arch/x86/kernel/alternative.c:2131 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2138 arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xce/0x1b0 kernel/jump_label.c:235 static_key_disable+0x1a/0x20 kernel/jump_label.c:243 toggle_allocation_gate+0x1b8/0x250 mm/kfence/core.c:804 process_one_work+0x8fa/0x1370 kernel/workqueue.c:2289 worker_thread+0xa63/0x1210 kernel/workqueue.c:2436 kthread+0x270/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.196 msecs