syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P21936/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=137257, q=3717 ncpus=2)
task:syz.0.3662      state:R  running task     stack:26568 pid:21936 tgid:21930 ppid:17763  task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7228
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7552
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:68
Code: ff ff 48 c7 c7 58 c2 ab 8b e8 09 75 c2 00 e9 1e fa ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 <c3> cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0000:ffffc900035df3c0 EFLAGS: 00000202
RAX: ffffffff895ecccd RBX: 0000000000000001 RCX: ffffffff921bb42e
RDX: ffffc900035df901 RSI: ffffc900035df9d8 RDI: ffffc900035df9d8
RBP: ffffc900035df480 R08: ffffffff921bb432 R09: 0000000000000000
R10: ffffc900035df438 R11: 000000000009885a R12: ffffc900035df488
R13: ffffc900035df438 R14: ffffc900035df9e0 R15: ffffc900035df46c
 deref_stack_reg arch/x86/kernel/unwind_orc.c:422 [inline]
 unwind_next_frame+0xd07/0x2090 arch/x86/kernel/unwind_orc.c:614
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:165
 __reset_page_owner+0x84/0x190 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4610 [inline]
 slab_alloc_node mm/slub.c:4939 [inline]
 __kmalloc_cache_noprof+0x243/0x6e0 mm/slub.c:5446
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 _kzalloc_noprof include/linux/slab.h:1286 [inline]
 j1939_session_new+0x7a/0x500 net/can/j1939/transport.c:1511
 j1939_tp_send+0x1fd/0x840 net/can/j1939/transport.c:2049
 j1939_sk_send_loop net/can/j1939/socket.c:1172 [inline]
 j1939_sk_sendmsg+0xb35/0x1440 net/can/j1939/socket.c:1295
 sock_sendmsg_nosec net/socket.c:775 [inline]
 __sock_sendmsg net/socket.c:790 [inline]
 ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738
 __sys_sendmmsg+0x20c/0x440 net/socket.c:2827
 __do_sys_sendmmsg net/socket.c:2854 [inline]
 __se_sys_sendmmsg net/socket.c:2851 [inline]
 __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2851
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8bf19ce59
RSP: 002b:00007ff8bff9d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007ff8bf416090 RCX: 00007ff8bf19ce59
RDX: 03fffffffffffe3d RSI: 0000200000003e40 RDI: 0000000000000003
RBP: 00007ff8bf232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000f5 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8bf416128 R14: 00007ff8bf416090 R15: 00007ffd6fa9c748
 </TASK>
rcu: rcu_preempt kthread starved for 231 jiffies! g137257 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27880 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7322
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12707 Comm: kworker/u8:14 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 96 88 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 d8 14 00 fb f4 <e9> fc 48 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000a085e0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000003 RCX: ffffffff8211aa2f
RDX: 0000000000000000 RSI: ffffffff8c1d2780 RDI: ffffffff81b68dff
RBP: ffff88804d6cd140 R08: 0000000000000000 R09: fffffbfff21b44f2
R10: 0000000000000000 R11: 0000000000000015 R12: 0000000000000003
R13: 0000000000000003 R14: ffff8880b853c340 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124418000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3aabd2b4c CR3: 00000000398cf000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
 kvm_wait arch/x86/kernel/kvm.c:1096 [inline]
 kvm_wait+0x124/0x160 arch/x86/kernel/kvm.c:1078
 pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x4b0/0xc00 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x1e0/0x260 kernel/locking/spinlock_debug.c:116
 spin_lock include/linux/spinlock.h:342 [inline]
 __netif_tx_lock include/linux/netdevice.h:4799 [inline]
 __dev_queue_xmit+0x19b7/0x4940 net/core/dev.c:4866
 dev_queue_xmit include/linux/netdevice.h:3436 [inline]
 can_send+0x5d7/0xbd0 net/can/af_can.c:279
 can_can_gw_rcv net/can/gw.c:569 [inline]
 can_can_gw_rcv+0x820/0xca0 net/can/gw.c:458
 deliver net/can/af_can.c:575 [inline]
 can_rcv_filter+0x153/0x890 net/can/af_can.c:602
 can_receive+0x2cb/0x500 net/can/af_can.c:674
 can_rcv+0x29e/0x300 net/can/af_can.c:699
 __netif_receive_skb_one_core+0x1b2/0x1e0 net/core/dev.c:6206
 __netif_receive_skb+0x1f/0x120 net/core/dev.c:6319
 process_backlog+0x37a/0x1580 net/core/dev.c:6670
 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7729
 napi_poll net/core/dev.c:7792 [inline]
 net_rx_action+0xa40/0xf20 net/core/dev.c:7949
 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
 do_softirq kernel/softirq.c:523 [inline]
 do_softirq+0xac/0xe0 kernel/softirq.c:510
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 cfg80211_inform_single_bss_data+0x959/0x1dc0 net/wireless/scan.c:2395
 cfg80211_inform_bss_data+0x230/0x39d0 net/wireless/scan.c:3238
 cfg80211_inform_bss_frame_data+0x247/0x760 net/wireless/scan.c:3329
 ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
 ieee80211_rx_bss_info net/mac80211/ibss.c:1064 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1545 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xe04/0x1c70 net/mac80211/ibss.c:1572
 ieee80211_iface_process_skb net/mac80211/iface.c:1763 [inline]
 ieee80211_iface_work+0xa9a/0x1070 net/mac80211/iface.c:1817
 cfg80211_wiphy_work+0x2b7/0x550 net/wireless/core.c:538
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>