INFO: task syz.3.677:7630 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.677 state:D stack:25024 pid:7630 tgid:7629 ppid:5600 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
io_schedule+0x80/0xe0 kernel/sched/core.c:8154
folio_wait_bit_common+0x83c/0xbc0 mm/filemap.c:1323
folio_lock include/linux/pagemap.h:1157 [inline]
migrate_folio_unmap mm/migrate.c:1250 [inline]
migrate_pages_batch+0x1bb1/0x4340 mm/migrate.c:1907
migrate_pages_sync mm/migrate.c:2051 [inline]
migrate_pages+0x1f90/0x2900 mm/migrate.c:2133
compact_zone+0x3144/0x4a70 mm/compaction.c:2669
compact_node mm/compaction.c:2938 [inline]
compact_nodes mm/compaction.c:2960 [inline]
sysctl_compaction_handler+0x3f3/0x880 mm/compaction.c:3011
proc_sys_call_handler+0x4c7/0x830 fs/proc/proc_sysctl.c:600
iter_file_splice_write+0xa36/0x1240 fs/splice.c:736
do_splice_from fs/splice.c:936 [inline]
direct_splice_actor+0x104/0x160 fs/splice.c:1159
splice_direct_to_actor+0x586/0xcc0 fs/splice.c:1103
do_splice_direct_actor fs/splice.c:1202 [inline]
do_splice_direct+0x19b/0x2a0 fs/splice.c:1228
do_sendfile+0x540/0x7e0 fs/read_write.c:1371
__do_sys_sendfile64 fs/read_write.c:1426 [inline]
__se_sys_sendfile64+0xdf/0x1a0 fs/read_write.c:1418
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffbb98ade59
RSP: 002b:00007ffbb7b06028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffbb9b35fa0 RCX: 00007ffbb98ade59
RDX: 00002000000000c0 RSI: 0000000000000007 RDI: 0000000000000009
RBP: 00007ffbb9943e6f R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000a R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffbb9b36038 R14: 00007ffbb9b35fa0 R15: 00007ffcd700f428
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5361:
#0: ffff88803603d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
1 lock held by udevd/5884:
#0: ffff8880275444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:948
1 lock held by syz.3.677/7630:
#0: ffff888061326500 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1158
2 locks held by syz.4.1722/10288:
3 locks held by syz.4.1759/10374:
#0: ffffffff8f5a1a20 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4e2/0x720 net/core/net_namespace.c:575
#1: ffff88813ffafd58 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#1: ffff88813ffafd58 (&n->list_lock){+.+.}-{3:3}, at: get_partial_node_bulk mm/slub.c:3772 [inline]
#1: ffff88813ffafd58 (&n->list_lock){+.+.}-{3:3}, at: __refill_objects_node+0x89/0x5b0 mm/slub.c:7197
#2: ffff8880b8628458 (hrtimer_bases.lock){-...}-{2:2}, at: class_raw_spinlock_constructor include/linux/spinlock.h:536 [inline]
#2: ffff8880b8628458 (hrtimer_bases.lock){-...}-{2:2}, at: __hrtimer_rearm_deferred+0x99/0x430 kernel/time/hrtimer.c:2153
3 locks held by syz.2.1760/10376:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:sum_w_vruntime_sub kernel/sched/fair.c:751 [inline]
RIP: 0010:__dequeue_entity+0xb40/0x1180 kernel/sched/fair.c:1053
Code: 24 68 74 11 48 8b 74 24 28 48 c7 c2 10 11 99 81 e8 85 6b a3 09 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ef e8 26 98 95 00 49 8b 5d 00 4d 8d 74 24 38 4c 89 f0
RSP: 0018:ffffc90000157888 EFLAGS: 00000046
RAX: 1ffffd1ffff90b80 RBX: ffffe8ffffc88fb8 RCX: dffffc0000000000
RDX: ffffffff81991110 RSI: ffffe8ffffc82dd0 RDI: ffffe8ffffc88ff8
RBP: 0000000000155cc0 R08: ffff888036eaddc7 R09: 1ffff11006dd5bb8
R10: dffffc0000000000 R11: ffffffff81991110 R12: ffff8880b863b980
R13: ffffe8ffffc85c00 R14: ffffe8ffffc88fb0 R15: ffffe8ffffc82e00
FS: 0000000000000000(0000) GS:ffff888125c4d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1bc428cc0 CR3: 000000005a668000 CR4: 00000000003526f0
Call Trace:
reweight_entity+0x25a/0xa60 kernel/sched/fair.c:4687
update_cfs_group kernel/sched/fair.c:4855 [inline]
enqueue_task_fair+0x1cf2/0x24e0 kernel/sched/fair.c:7875
enqueue_task+0x75/0x410 kernel/sched/core.c:2184
activate_task kernel/sched/core.c:2224 [inline]
ttwu_do_activate+0x1c8/0x640 kernel/sched/core.c:3824
ttwu_queue kernel/sched/core.c:4077 [inline]
try_to_wake_up+0x7b1/0x1430 kernel/sched/core.c:4415
hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2293
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113
handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1151
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245