rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9782/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=32801, q=171 ncpus=2)
task:syz.3.1147 state:R running task stack:22568 pid:9782 ppid:5773 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__local_bh_enable_ip+0x14b/0x1c0 kernel/softirq.c:413
local_bh_enable include/linux/bottom_half.h:33 [inline]
bpf_test_run+0x3dd/0x870 net/bpf/test_run.c:425
bpf_prog_test_run_skb+0xdbb/0x18f0 net/bpf/test_run.c:1089
bpf_prog_test_run+0x31f/0x390 kernel/bpf/syscall.c:4132
__sys_bpf+0x49d/0x890 kernel/bpf/syscall.c:5496
__do_sys_bpf kernel/bpf/syscall.c:5582 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5580 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5580
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1086d9e159
RSP: 002b:00007f1087cff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1087025fa0 RCX: 00007f1086d9e159
RDX: 0000000000000041 RSI: 00002000000011c0 RDI: 000000000000000a
RBP: 00007f1086e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1087026038 R14: 00007f1087025fa0 R15: 00007fffd5a00e18
rcu: rcu_preempt kthread timer wakeup didn't happen for 10281 jiffies! g32801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=21781
rcu: rcu_preempt kthread starved for 10282 jiffies! g32801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:I stack:25960 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9765 Comm: syz.0.1140 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:ieee80211_rx_napi+0x382/0x3c0 net/mac80211/rx.c:5474
Code: 92 89 fe 48 8d 44 24 40 48 39 c3 0f 85 04 ff ff ff e8 92 65 7d f7 eb 0d e8 8b 65 7d f7 4c 89 f7 e8 63 df 79 fe 48 8b 44 24 18 <66> 42 c7 44 28 04 f8 f8 48 c7 44 24 20 0e 36 e0 45 4a c7 04 28 00
RSP: 0018:ffffc900001f0c20 EFLAGS: 00000246
RAX: 1ffff9200003e188 RBX: dffffc0000000000 RCX: ffff88805f601e00
RDX: 0000000000000100 RSI: ffffffff8b1d35c0 RDI: ffffffff8b1d3580
RBP: ffffc900001f0ce0 R08: ffffffff8e8c8daf R09: 1ffffffff1d191b5
R10: dffffc0000000000 R11: fffffbfff1d191b6 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc900001f0c60 R15: ffffffff8a0a1a42
FS: 00007fc9196dc6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2da07ff8 CR3: 000000005ee93000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
ieee80211_rx include/net/mac80211.h:4971 [inline]
ieee80211_handle_queued_frames+0x105/0x190 net/mac80211/main.c:319
tasklet_action_common+0x2d4/0x460 kernel/softirq.c:809
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:208
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 7c 0d 05 0d 48 89 de 5b e9 c3 b0 57 00 cc cc cc 0f 1e fa 48 8b 04 24 65 48 8b 0d 80 35 7c 7e 65 8b 15 81 35 7c
RSP: 0018:ffffc900041a7310 EFLAGS: 00000287
RAX: ffffffff8ea48cf4 RBX: ffffffff8ea48cf4 RCX: ffff88805f601e00
RDX: 0000000000000000 RSI: ffffffff81e01222 RDI: ffffffff81e01287
RBP: ffffffff8ea48cd8 R08: ffffc900041a74b0 R09: 0000000000000006
R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff81e01287
R13: ffffffff8ea48cd8 R14: ffffffff81e01222 R15: ffffffff8ea48cf8
__orc_find arch/x86/kernel/unwind_orc.c:99 [inline]
orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
unwind_next_frame+0x4e2/0x2990 arch/x86/kernel/unwind_orc.c:494
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
discard_slab mm/slub.c:2127 [inline]
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
kmem_cache_zalloc include/linux/slab.h:711 [inline]
taskstats_tgid_alloc kernel/taskstats.c:586 [inline]
taskstats_exit+0x14d/0xce0 kernel/taskstats.c:625
do_exit+0x8fc/0x2530 kernel/exit.c:866
do_group_exit+0x22d/0x2f0 kernel/exit.c:1032
get_signal+0x12a6/0x1390 kernel/signal.c:2911
arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc91879e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc9196dc028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: fffffffffffffe00 RBX: 00007fc918a25fa0 RCX: 00007fc91879e159
RDX: 0000000020000001 RSI: 0000200000000780 RDI: 0000000000000006
RBP: 00007fc918835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc918a26038 R14: 00007fc918a25fa0 R15: 00007ffeab2ffb28