INFO: task syz.7.1161:10132 blocked for more than 141 seconds.
Not tainted 6.12.0-rc4-syzkaller-00819-gb62607870b29 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.1161 state:D stack:23808 pid:10132 tgid:10132 ppid:9148 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x18af/0x4bd0 kernel/sched/core.c:6690
__schedule_loop kernel/sched/core.c:6767 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6782
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
pipe_release+0x48/0x320 fs/pipe.c:727
__fput+0x23f/0x880 fs/file_table.c:431
task_work_run+0x24f/0x310 kernel/task_work.c:239
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+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbf657e719
RSP: 002b:00007fffe6268ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fbbf6737a80 RCX: 00007fbbf657e719
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fbbf6737a80 R08: 0000000000000006 R09: 00007fffe62691ef
R10: 00000000003ffbd0 R11: 0000000000000246 R12: 0000000000051c0b
R13: 00007fffe6269000 R14: 0000000000000032 R15: ffffffffffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
2 locks held by getty/5596:
#0: ffff8880314e10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5827:
4 locks held by syz-executor/9141:
2 locks held by syz-executor/9144:
1 lock held by syz-executor/9148:
1 lock held by syz-executor/9151:
4 locks held by syz-executor/9209:
#0: ffff8880b863ead8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
#1: ffff8880b8628948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987
#2: ffff88805cea0758 (&sb->s_type->i_lock_key#9){+.+.}-{2:2}, at: spin_trylock include/linux/spinlock.h:361 [inline]
#2: ffff88805cea0758 (&sb->s_type->i_lock_key#9){+.+.}-{2:2}, at: lock_for_kill+0x85/0x210 fs/dcache.c:660
#3: ffffffff9a6902c0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_assert_init+0x164/0x440 lib/debugobjects.c:897
2 locks held by syz.7.1161/10132:
#0: ffffffff8fcd41e8 (rtnl_mutex){+.+.}-{3:3}, at: ppp_release+0x87/0x1f0 drivers/net/ppp/ppp_generic.c:408
#1: ffffffff8e93d3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#1: ffffffff8e93d3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc4-syzkaller-00819-gb62607870b29 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/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
CPU: 0 UID: 0 PID: 3523 Comm: kworker/u8:8 Not tainted 6.12.0-rc4-syzkaller-00819-gb62607870b29 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:sched_idle_rq kernel/sched/fair.c:6906 [inline]
RIP: 0010:dequeue_entities+0xb84/0xfa0 kernel/sched/fair.c:7169
Code: 74 20 89 c3 48 8b 44 24 58 42 0f b6 04 20 84 c0 0f 85 5e 02 00 00 48 8b 44 24 40 83 38 00 89 d8 74 7f 84 c0 0f 84 8d 00 00 00 <43> 0f b6 44 25 00 84 c0 0f 85 5e 02 00 00 8b 5d 00 48 8b 44 24 50
RSP: 0018:ffffc9000ca97780 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 000000000016e360 RSI: 0000000000000001 RDI: ffff8880b863ebc8
RBP: ffff8880b863eb00 R08: ffffffff81447d53 R09: 1ffffffff203a4b5
R10: dffffc0000000000 R11: fffffbfff203a4b6 R12: dffffc0000000000
R13: 1ffff110170c7d60 R14: ffff8880b863eac0 R15: ffff8880328e9e00
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056356d337f50 CR3: 000000000e734000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
dequeue_task_fair+0xdc/0x1e0 kernel/sched/fair.c:7196
block_task kernel/sched/core.c:2090 [inline]
__schedule+0x5e8/0x4bd0 kernel/sched/core.c:6638
__schedule_loop kernel/sched/core.c:6767 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6782
toggle_allocation_gate+0x171/0x260 mm/kfence/core.c:851
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244