sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11470/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=79497, q=652 ncpus=1)
task:syz.6.1037 state:R running task stack:24648 pid:11470 tgid:11468 ppid:6769 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5581 [inline]
__schedule+0x1b47/0x5b40 kernel/sched/core.c:7384
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7664
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:524 [inline]
irqentry_exit+0x14f/0x920 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:deref_stack_reg+0x1ac/0x220 arch/x86/kernel/unwind_orc.c:422
Code: 30 4c 89 c7 49 89 f7 e8 12 07 00 00 49 89 c6 48 8b 5c 24 08 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 64 e7 c1 00 <4c> 89 33 b0 01 eb 02 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0000:ffffc90003426ff8 EFLAGS: 00000246
RAX: 1ffff92000684e25 RBX: ffffc90003427128 RCX: 0000000000000001
RDX: ffffc90003427128 RSI: dffffc0000000000 RDI: ffffc90003427cb0
RBP: ffffc90003420000 R08: ffffc90003427cb0 R09: 0000000000000000
R10: ffffc90003427138 R11: fffff52000684e29 R12: 1ffff92000684e1e
R13: 1ffff92000684e1f R14: ffffc90003427df0 R15: dffffc0000000000
unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
alloc_buffer_head+0x2a/0x280 fs/buffer.c:2874
folio_alloc_buffers+0x1a4/0x630 fs/buffer.c:750
create_empty_buffers+0x3a/0x4d0 fs/buffer.c:1580
block_read_full_folio+0x129/0x8c0 fs/buffer.c:2293
filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2538
do_read_cache_folio+0x354/0x590 mm/filemap.c:4174
erofs_bread+0x451/0x720 fs/erofs/data.c:41
erofs_read_inode fs/erofs/inode.c:52 [inline]
erofs_fill_inode fs/erofs/inode.c:230 [inline]
erofs_iget+0x6fd/0x2cb0 fs/erofs/inode.c:303
erofs_fc_fill_super+0xec9/0x1f60 fs/erofs/super.c:768
get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1883
vfs_get_tree+0x92/0x2a0 fs/super.c:1943
fc_mount fs/namespace.c:1209 [inline]
do_new_mount_fc fs/namespace.c:3785 [inline]
do_new_mount+0x319/0xdc0 fs/namespace.c:3861
do_mount fs/namespace.c:4194 [inline]
__do_sys_mount fs/namespace.c:4407 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4384
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff651d9f3ca
RSP: 002b:00007ff652c1be58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff652c1bee0 RCX: 00007ff651d9f3ca
RDX: 0000200000000000 RSI: 0000200000000080 RDI: 00007ff652c1bea0
RBP: 0000200000000000 R08: 00007ff652c1bee0 R09: 000000000200004c
R10: 000000000200004c R11: 0000000000000246 R12: 0000200000000080
R13: 00007ff652c1bea0 R14: 00000000000001cb R15: 00002000000000c0
rcu: rcu_preempt kthread starved for 358 jiffies! g79497 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5581 [inline]
__schedule+0x1b47/0x5b40 kernel/sched/core.c:7384
__schedule_loop kernel/sched/core.c:7461 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7476
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 10619 Comm: kworker/u8:16 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 6d ed b5 f5 f7 c3 00 02 00 00 74 05 e8 f0 83 e2 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 74 e6 a6 f5 65 48 8b 05 ac e0 a7 07 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc90000007b48 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 8000000000000102
RDX: 0000000000000002 RSI: ffffffff8e43d4e5 RDI: 0000000000000001
RBP: ffffc90000007e48 R08: ffffffff9079b1bf R09: 1ffffffff20f3637
R10: dffffc0000000000 R11: fffffbfff20f3638 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff888029700000 R15: ffff88802991a410
FS: 0000000000000000(0000) GS:ffff888124cbd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a6937862b CR3: 0000000031ee8000 CR4: 00000000003526f0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
dummy_timer+0x4948/0x4cc0 drivers/usb/gadget/udc/dummy_hcd.c:-1
__run_hrtimer kernel/time/hrtimer.c:2075 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2132
hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2149
handle_softirqs+0x223/0x840 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
ieee80211_rx_bss_info net/mac80211/ibss.c:1137 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1546 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1e95/0x2c40 net/mac80211/ibss.c:1573
ieee80211_iface_process_skb net/mac80211/iface.c:1807 [inline]
ieee80211_iface_work+0x769/0xfa0 net/mac80211/iface.c:1861
cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:615
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/0x480 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