INFO: task syz.1.275:6412 blocked for more than 151 seconds. Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.275 state:D stack:27168 pid:6412 tgid:6412 ppid:5571 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_timeout+0x258/0x2a0 kernel/time/timer.c:2557 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x3de/0x5f0 kernel/sched/completion.c:116 __flush_work+0x5bd/0xc60 kernel/workqueue.c:4208 __cancel_work_sync+0x10c/0x130 kernel/workqueue.c:4328 uhid_dev_destroy drivers/hid/uhid.c:584 [inline] uhid_char_release+0xca/0x210 drivers/hid/uhid.c:662 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3e925799f9 RSP: 002b:00007ffc7a1cf488 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000047280 RCX: 00007f3e925799f9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007ffc7a1cf560 R08: 0000000000000001 R09: 00007ffc7a1cf76f R10: 00007f3e92400000 R11: 0000000000000246 R12: 0000000000000032 R13: 00007ffc7a1cf580 R14: 00007ffc7a1cf5a0 R15: ffffffffffffffff Showing all locks held in the system: 3 locks held by kworker/0:0/8: 3 locks held by kworker/u8:0/11: 3 locks held by kworker/u8:1/12: 1 lock held by khungtaskd/31: #0: ffffffff8ddb5ce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8ddb5ce0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8ddb5ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626 3 locks held by kworker/u8:3/53: 3 locks held by kworker/u8:4/62: 3 locks held by kworker/u8:5/80: 4 locks held by kworker/u8:6/1105: 3 locks held by kworker/u8:7/2549: 3 locks held by kworker/u8:8/3411: 1 lock held by udevd/4669: 2 locks held by getty/4978: #0: ffff88802d4d00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 10 locks held by kworker/0:3/5272: 3 locks held by kworker/0:4/5273: 3 locks held by kworker/0:6/5310: 3 locks held by kworker/u8:10/5422: 3 locks held by kworker/u8:11/5426: 4 locks held by kworker/u8:13/5429: 3 locks held by kworker/u8:15/5434: 3 locks held by kworker/u8:16/6443: 2 locks held by syz-executor/6447: 2 locks held by syz-executor/6458: 2 locks held by syz-executor/6463: 1 lock held by udevd/6580: 2 locks held by udevd/6649: 2 locks held by udevd/6728: 2 locks held by udevd/6829: 1 lock held by syz.1.335/6878: 3 locks held by syz.2.336/6875: 3 locks held by kworker/u8:19/6881: 6 locks held by kworker/u8:20/6883: 2 locks held by syz-executor/6884: 2 locks held by syz-executor/6885: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf4e/0x1280 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111