rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6488/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=177937, q=1504 ncpus=2)
task:syz-executor state:R running task stack:22656 pid:6488 tgid:6488 ppid:1 task_flags:0x40054c flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:deref_stack_reg+0xe/0x230 arch/x86/kernel/unwind_orc.c:418
Code: 4c 24 18 e9 f2 fe ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 <48> 89 54 24 18 49 89 f0 49 89 ff 48 be 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc9000493f4a0 EFLAGS: 00000286
RAX: fffffffffffffff0 RBX: ffffffff90b3b994 RCX: 0000000000000000
RDX: ffffc9000493f608 RSI: ffffc9000493f960 RDI: ffffc9000493f5c8
RBP: dffffc0000000000 R08: ffffc9000493f627 R09: 0000000000000000
R10: ffffc9000493f618 R11: fffff52000927ec5 R12: ffffc9000493f618
R13: 1ffff92000927ebb R14: ffffc9000493f5c8 R15: 1ffffffff2167732
unwind_next_frame+0x18c6/0x23c0 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
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5339
kmalloc_noprof include/linux/slab.h:962 [inline]
slab_free_hook mm/slub.c:2639 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x15b/0x630 mm/slub.c:6254
task_work_run+0x1d9/0x270 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x69b/0x2320 kernel/exit.c:971
do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
get_signal+0x1284/0x1330 kernel/signal.c:3034
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c1275cfce
RSP: 002b:00007ffd0cfb7d18 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 000055556ea4c500 RCX: 00007f5c1275cfce
RDX: 0000000040000000 RSI: 00007ffd0cfb7dbc RDI: ffffffffffffffff
RBP: 00007ffd0cfb7dbc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000005a
R13: 000055556ea5f9f0 R14: 00000000000e8310 R15: 00007ffd0cfb7e10
rcu: rcu_preempt kthread starved for 1447 jiffies! g177937 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:27776 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 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: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:lock_acquire+0xa4/0x2e0 kernel/locking/lockdep.c:5844
Code: 3d 00 3e 70 0e 00 0f 84 c1 00 00 00 65 8b 05 e3 89 7a 11 85 c0 0f 85 b2 00 00 00 65 48 8b 05 2b 44 7a 11 83 b8 14 0b 00 00 00 <0f> 85 9d 00 00 00 9c 5b fa 48 c7 c7 93 c4 f0 8d e8 c7 01 0c 0a 65
RSP: 0018:ffffc90000a085e0 EFLAGS: 00000246
RAX: ffff88801daadac0 RBX: ffffffff89741b10 RCX: 0000000080000102
RDX: 0000000000000000 RSI: ffffffff81767a62 RDI: 1ffffffff1cec05c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000a08778 R11: ffffffff81b0b100 R12: 0000000000000002
R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125564000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555582c444e8 CR3: 0000000022e5e000 CR4: 00000000003526f0
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
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
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2687 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6254
skb_ext_reset include/linux/skbuff.h:5090 [inline]
skb_release_head_state+0x270/0x360 net/core/skbuff.c:1195
skb_release_all net/core/skbuff.c:1201 [inline]
__kfree_skb+0x24/0x210 net/core/skbuff.c:1217
can_receive+0x366/0x440 net/can/af_can.c:679
can_rcv+0x1f9/0x330 net/can/af_can.c:699
__netif_receive_skb_one_core net/core/dev.c:6167 [inline]
__netif_receive_skb net/core/dev.c:6280 [inline]
process_backlog+0xc66/0x1950 net/core/dev.c:6631
__napi_poll+0xae/0x340 net/core/dev.c:7695
napi_poll net/core/dev.c:7758 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7910
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
ieee80211_rx_bss_info net/mac80211/ibss.c:1166 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1575 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1ac7/0x2cd0 net/mac80211/ibss.c:1602
ieee80211_iface_process_skb net/mac80211/iface.c:1748 [inline]
ieee80211_iface_work+0x84e/0x1340 net/mac80211/iface.c:1802
cfg80211_wiphy_work+0x2ab/0x4a0 net/wireless/core.c:440
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245