INFO: task syz-executor.1:5054 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00251-gf0ab9f34e59e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:18424 pid:5054 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 io_schedule+0x8c/0x100 kernel/sched/core.c:9028 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 lock_buffer include/linux/buffer_head.h:410 [inline] hfs_mdb_commit+0xaf9/0xfd0 fs/hfs/mdb.c:325 hfs_sync_fs+0x15/0x20 fs/hfs/super.c:35 sync_filesystem+0xec/0x220 fs/sync.c:56 generic_shutdown_super+0x6f/0x340 fs/super.c:472 kill_block_super+0x68/0xa0 fs/super.c:1417 deactivate_locked_super+0xa4/0x110 fs/super.c:330 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f999e67de17 RSP: 002b:00007ffe654b1878 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f999e67de17 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffe654b1930 RBP: 00007ffe654b1930 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe654b29f0 R13: 00007f999e6c73b9 R14: 00000000002ce292 R15: 0000000000000005 INFO: task kworker/1:15:29498 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00251-gf0ab9f34e59e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:15 state:D stack:25672 pid:29498 ppid:2 flags:0x00004000 Workqueue: events_long flush_mdb Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 io_schedule+0x8c/0x100 kernel/sched/core.c:9028 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 lock_buffer include/linux/buffer_head.h:410 [inline] hfs_mdb_commit+0x119/0xfd0 fs/hfs/mdb.c:271 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8d328db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffffffff8d329170 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff8d328be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4768: #0: ffff88814c318098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187 1 lock held by syz-executor.1/5054: #0: ffff88807ebba0e0 (&type->s_umount_key#88){++++}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:360 2 locks held by kworker/1:15/29498: #0: ffff888012871538 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work+0x7e3/0x12c0 kernel/workqueue.c:2569 #1: ffffc900052c7d00 ((work_completion)(&(&sbi->mdb_work)->work)){+.+.}-{0:0}, at: process_one_work+0x82b/0x12c0 kernel/workqueue.c:2571 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc4-syzkaller-00251-gf0ab9f34e59e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10 Comm: kworker/u4:0 Not tainted 6.5.0-rc4-syzkaller-00251-gf0ab9f34e59e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:hlock_class kernel/locking/lockdep.c:223 [inline] RIP: 0010:mark_lock+0x6c/0x340 kernel/locking/lockdep.c:4663 Code: 40 0f 94 c5 83 f5 09 eb 0b 89 d5 83 fa 20 0f 83 d1 02 00 00 41 be 01 00 00 00 89 e9 41 d3 e6 49 8d 5f 20 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 28 02 00 00 8b 1b 81 e3 ff 1f 00 00 48 RSP: 0018:ffffc900000f7958 EFLAGS: 00000802 RAX: 1ffff11002bcc515 RBX: ffff888015e628a8 RCX: 0000000000000006 RDX: 0000000000000006 RSI: ffff888015e62888 RDI: ffff888015e61dc0 RBP: 0000000000000006 R08: ffffffff907b13df R09: 1ffffffff20f627b R10: dffffc0000000000 R11: fffffbfff20f627c R12: ffff888015e628a8 R13: dffffc0000000000 R14: 0000000000000040 R15: ffff888015e62888 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd35bc3b580 CR3: 000000000d130000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_held_locks kernel/locking/lockdep.c:4281 [inline] __trace_hardirqs_on_caller kernel/locking/lockdep.c:4307 [inline] lockdep_hardirqs_on_prepare+0x3a4/0x7a0 kernel/locking/lockdep.c:4366 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61 __local_bh_enable_ip+0x168/0x1f0 kernel/softirq.c:386 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x309/0x3a0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x2d3/0x5c0 net/batman-adv/network-coding.c:720 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304