INFO: task syz.2.9513:8407 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.9513 state:D stack:25368 pid:8407 tgid:8397 ppid:5264 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0xfee/0x60e0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7004
io_schedule+0x8a/0xf0 kernel/sched/core.c:7831
folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1323
folio_lock include/linux/pagemap.h:1170 [inline]
migrate_folio_unmap mm/migrate.c:1250 [inline]
migrate_pages_batch+0x1b85/0x4530 mm/migrate.c:1890
migrate_pages_sync+0x4db/0x880 mm/migrate.c:2034
migrate_pages+0x1aae/0x28a0 mm/migrate.c:2116
compact_zone+0x2464/0x44c0 mm/compaction.c:2647
compact_node+0x17f/0x2c0 mm/compaction.c:2916
compact_nodes mm/compaction.c:2938 [inline]
sysctl_compaction_handler mm/compaction.c:2989 [inline]
sysctl_compaction_handler+0x141/0x210 mm/compaction.c:2976
proc_sys_call_handler+0x47f/0x5a0 fs/proc/proc_sysctl.c:600
iter_file_splice_write+0x82b/0x10a0 fs/splice.c:738
do_splice_from fs/splice.c:938 [inline]
direct_splice_actor+0x192/0x6c0 fs/splice.c:1161
splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x174/0x240 fs/splice.c:1230
do_sendfile+0xadc/0xe20 fs/read_write.c:1372
__do_sys_sendfile64 fs/read_write.c:1427 [inline]
__se_sys_sendfile64 fs/read_write.c:1419 [inline]
__x64_sys_sendfile64+0x154/0x220 fs/read_write.c:1419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f355259c629
RSP: 002b:00007f35534d9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f3552816270 RCX: 00007f355259c629
RDX: 00002000000000c0 RSI: 000000000000000a RDI: 000000000000000b
RBP: 00007f3552632b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000010000a R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3552816308 R14: 00007f3552816270 R15: 00007ffd3d664ee8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e7e93e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e7e93e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e7e93e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
2 locks held by getty/5563:
#0: ffff888033c250a0 (&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+0x419/0x1500 drivers/tty/n_tty.c:2211
1 lock held by udevd/3109:
#0: ffff888027f51358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:961
1 lock held by syz.2.9513/8407:
#0: ffff888063ed6420 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xd25/0x1050 kernel/hung_task.c:515
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
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: 190 Comm: kworker/u8:6 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:curve25519_ever64_base+0x5be/0x7a0 lib/crypto/x86/curve25519.h:1572
Code: 24 08 66 4c 0f 38 f6 d1 4d 89 54 24 10 66 4c 0f 38 f6 d9 4d 89 5c 24 18 48 c7 c0 00 00 00 00 48 0f 42 c2 49 01 c0 4d 89 04 24 <4c> 89 ea 4c 89 e6 4c 89 e7 e8 04 eb ff ff 4c 89 e9 4c 89 e2 4c 89
RSP: 0018:ffffc900027276b0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc90002727810 RCX: 0000000000000000
RDX: 0000000000000026 RSI: ffffc90002727850 RDI: ffffc900027277f0
RBP: 0000000000000000 R08: 0a6b131f20bc9346 R09: 42dfc8cf1c79cf81
R10: 071d6e89a72650c3 R11: af4035be756537eb R12: ffffc900027277d0
R13: ffffc90002727850 R14: 000000000000002e R15: ffffc90002727750
FS: 0000000000000000(0000) GS:ffff888124448000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f7e504e168 CR3: 000000000e598000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
curve25519_base_arch lib/crypto/x86/curve25519.h:1603 [inline]
curve25519_generate_public+0x50/0xc0 lib/crypto/curve25519.c:57
wg_noise_handshake_create_initiation+0x248/0x610 drivers/net/wireguard/noise.c:542
wg_packet_send_handshake_initiation+0x19c/0x360 drivers/net/wireguard/send.c:34
wg_packet_handshake_send_worker+0x1c/0x30 drivers/net/wireguard/send.c:51
process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
process_scheduled_works kernel/workqueue.c:3358 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245