[syzbot] [kernel?] INFO: task hung in futex_hash_allocate

From: syzbot
Date: Tue Jun 10 2025 - 05:22:02 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 8630c59e9936 Merge tag 'kbuild-v6.16' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16a28a0c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6678e7c8a50af095
dashboard link: https://syzkaller.appspot.com/bug?extid=d6156c54e546fe8502c0
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1154b20c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123349d4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0cf3c417fa1a/disk-8630c59e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1dfe2ab6b15e/vmlinux-8630c59e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cbed08235a67/bzImage-8630c59e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d6156c54e546fe8502c0@xxxxxxxxxxxxxxxxxxxxxxxxx

INFO: task syz-executor341:6067 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor341 state:D stack:29616 pid:6067 tgid:6065 ppid:5854 task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
futex_hash_allocate+0xd0a/0xf00 kernel/futex/core.c:1619
futex_hash_prctl+0x1f4/0x650 kernel/futex/core.c:1757
__do_sys_prctl+0x171f/0x24c0 kernel/sys.c:2825
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f42706752a9
RSP: 002b:00007f427060d238 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f42706ff318 RCX: 00007f42706752a9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000004e
RBP: 00007f42706ff310 R08: 0000000000000000 R09: 00007f427060d6c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f42706ff31c
R13: 0000000000000000 R14: 00007ffdd85d0a10 R15: 00007ffdd85d0af8
</TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3c4b40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c4b40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3c4b40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
2 locks held by getty/5597:
#0: ffff888035e720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
__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+0x3c2/0x780 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
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 0b 56 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 b3 1e 0e 00 fb f4 <e9> 0c fb 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e007e08 EFLAGS: 000002c6
RAX: 00000000000e2ce9 RBX: 0000000000000000 RCX: ffffffff8b7bec69
RDX: 0000000000000000 RSI: ffffffff8dc134a5 RDI: ffffffff8bf55a20
RBP: fffffbfff1c12ef0 R08: 0000000000000001 R09: ffffed1017086645
R10: ffff8880b843322b R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff8e097780 R14: ffffffff90883650 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124962000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cacddef660 CR3: 000000000e182000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:743
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
rest_init+0x16b/0x2b0 init/main.c:744
start_kernel+0x3ee/0x4d0 init/main.c:1101
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148
</TASK>

---
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Next message: Jerome Marchand: "[PATCH v2 2/2] selftests/bpf: Convert test_sysctl to prog_tests"
Previous message: Jerome Marchand: "[PATCH v2 1/2] bpf: Specify access type of bpf_sysctl_get_name args"
Next in thread: syzbot: "Re: [syzbot] [kernel?] INFO: task hung in futex_hash_allocate"
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