INFO: task syz.3.402:7452 blocked for more than 143 seconds.
Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.402 state:D stack:28440 pid:7452 tgid:7449 ppid:5847 task_flags:0x400740 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5401 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6790
__schedule_loop kernel/sched/core.c:6868 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6883
schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
coredump_wait fs/coredump.c:504 [inline]
do_coredump+0x8fa/0x4f10 fs/coredump.c:686
get_signal+0x22e3/0x26d0 kernel/signal.c:3019
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f77cd18e929
RSP: 002b:00007f77ce08d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 00000000000000ca RBX: 00007f77cd3b6088 RCX: 00007f77cd18e929
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f77cd3b608c
RBP: 00007f77cd3b6080 R08: 00007f77ce0af000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f77cd3b608c
R13: 0000000000000000 R14: 00007ffc41f837e0 R15: 00007ffc41f838c8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e5c4e80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c4e80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c4e80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
3 locks held by kworker/u9:0/50:
#0: ffff888055b40948 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000ba7d10 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88802bbe4dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x175/0x430 net/bluetooth/hci_sync.c:331
2 locks held by getty/5591:
#0: ffff88814db900a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:470
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3804 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3824 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3879 [inline]
RIP: 0010:__lock_acquire+0xbaa/0x1c90 kernel/locking/lockdep.c:5240
Code: 80 46 86 c8 61 e8 36 a7 ff ff 4c 8b 04 24 49 0f af d8 48 c1 eb 2d 48 8d 04 dd e0 f9 14 97 48 89 04 24 48 8b 04 dd e0 f9 14 97 <48> 8d 48 f8 48 85 c0 48 0f 45 c1 eb 04 48 83 e8 08 48 85 c0 74 16
RSP: 0018:ffffc90000a08b60 EFLAGS: 00000803
RAX: ffffffff93eb8528 RBX: 0000000000048b19 RCX: 00000000f373bbff
RDX: 6176e092c4a565e6 RSI: 00000000e6de3653 RDI: ffff88801e2e2f58
RBP: ffff88801e2e2440 R08: 6176e092c4a565e6 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801e2e2f30
R13: ffff88801e2e2f58 R14: 000000007a7964c8 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff888124815000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560491e34168 CR3: 000000007ff53000 CR4: 00000000003526f0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
lock_hrtimer_base kernel/time/hrtimer.c:171 [inline]
hrtimer_try_to_cancel+0xa9/0x2f0 kernel/time/hrtimer.c:1362
cancel_dl_timer kernel/sched/deadline.c:352 [inline]
cancel_inactive_timer kernel/sched/deadline.c:365 [inline]
task_contending+0x3fc/0x670 kernel/sched/deadline.c:521
enqueue_dl_entity+0xae3/0x2790 kernel/sched/deadline.c:2060
dl_server_start+0xda/0x2f0 kernel/sched/deadline.c:1670
enqueue_task_fair+0x9d7/0x1200 kernel/sched/fair.c:7030
enqueue_task+0x78/0x4e0 kernel/sched/core.c:2084
activate_task kernel/sched/core.c:2126 [inline]
ttwu_do_activate+0x184/0xb10 kernel/sched/core.c:3746
sched_ttwu_pending+0x2bc/0x640 kernel/sched/core.c:3848
csd_do_func kernel/smp.c:134 [inline]
__flush_smp_call_function_queue+0x4cf/0x8c0 kernel/smp.c:587
__sysvec_call_function_single+0x87/0x400 arch/x86/kernel/smp.c:271
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0x9f/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: eb 6b 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 03 d9 21 00 fb f4 7c fb 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df8 EFLAGS: 000002c2
RAX: 00000000016eea3d RBX: 0000000000000001 RCX: ffffffff8b883c79
RDX: 0000000000000000 RSI: ffffffff8de329a6 RDI: ffffffff8c158f60
RBP: ffffed1003c5c488 R08: 0000000000000001 R09: ffffed10170a6645
R10: ffff8880b853322b R11: 0000000000000001 R12: 0000000000000001
R13: ffff88801e2e2440 R14: ffffffff90a98350 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:749
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148