rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6796/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=53369, q=57 ncpus=2)
task:kworker/u8:22 state:R running task stack:24760 pid:6796 tgid:6796 ppid:2 task_flags:0x4208160 flags:0x00080000
Workqueue: kvfree_rcu_reclaim kfree_rcu_work
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14db/0x5030 kernel/sched/core.c:6902
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7229
irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:124 [inline]
RIP: 0010:lock_release+0x6f/0x3b0 kernel/locking/lockdep.c:5881
Code: 0d e8 75 9e 08 00 84 c0 0f 84 95 02 00 00 83 3d d6 7a 04 0e 00 0f 84 1d 02 00 00 65 8b 05 69 26 04 11 85 c0 0f 85 0e 02 00 00 <65> 4c 8b 3c 25 08 70 a2 92 41 83 bf 04 0b 00 00 00 0f 85 f7 01 00
RSP: 0018:ffffc9001b93f3d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff9044ac01 RCX: 0000000080000001
RDX: ffffc9001b93f501 RSI: ffffffff8be09740 RDI: ffffffff8be09700
RBP: dffffc0000000000 R08: ffffc9001b93f880 R09: 0000000000000000
R10: ffffc9001b93f558 R11: fffff52003727ead R12: ffffc9001b93f890
R13: ffffffff81745ac5 R14: ffffffff8e144ce0 R15: ffffffff81745ac5
rcu_lock_release include/linux/rcupdate.h:322 [inline]
rcu_read_unlock include/linux/rcupdate.h:881 [inline]
class_rcu_destructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 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:2768 [inline]
slab_free_freelist_hook mm/slub.c:2797 [inline]
slab_free_bulk mm/slub.c:6944 [inline]
kmem_cache_free_bulk+0x3fb/0xdd0 mm/slub.c:7721
kfree_bulk include/linux/slab.h:841 [inline]
kvfree_rcu_bulk+0xe5/0x1b0 mm/slab_common.c:1464
kfree_rcu_work+0xed/0x170 mm/slab_common.c:1542
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x389/0x480 kernel/kthread.c:467
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread starved for 10417 jiffies! g53369 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:5290 [inline]
__schedule+0x14db/0x5030 kernel/sched/core.c:6902
__schedule_loop kernel/sched/core.c:6984 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6999
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x11b0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:2297
kthread+0x389/0x480 kernel/kthread.c:467
ret_from_fork+0x510/0xa50 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: 13908 Comm: syz.1.2686 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 74 3c fb 0b 48 89 de 5b e9 c3 82 5b 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 70 a2 92 65 8b 15 78 56 e1 10 81 e2 00 01 ff 00
RSP: 0018:ffffc90000a08bc0 EFLAGS: 00000293
RAX: ffffffff81aee335 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff88807b863c80 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffff88807f4e0ee7 R09: 1ffff1100fe9c1dc
R10: dffffc0000000000 R11: ffffed100fe9c1dd R12: ffff88807f4e3100
R13: ffff88801ef78a10 R14: ffff88807bb3a218 R15: ffff88807bb3a140
FS: 00007f03801696c0(0000) GS:ffff888125cf9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88e09e7dac CR3: 0000000028b60000 CR4: 00000000003526f0
Call Trace:
ktime_get_with_offset+0x35/0x2a0 kernel/time/timekeeping.c:861
ktime_get_real include/linux/timekeeping.h:88 [inline]
mac80211_hwsim_get_tsf_raw drivers/net/wireless/virtual/mac80211_hwsim.c:1218 [inline]
__mac80211_hwsim_beacon_tx+0x2b7/0x6c0 drivers/net/wireless/virtual/mac80211_hwsim.c:2299
mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365
__iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:760
ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:796
mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1866
handle_softirqs+0x22b/0x7c0 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x60/0x150 kernel/softirq.c:727
irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 7a 57 3d f6 48 89 df e8 02 cb 3d f6 e8 ad a8 67 f6 fb bf 01 00 00 00 62 d6 2f f6 65 8b 05 ab 38 41 07 85 c0 74 07 5b e9 91 46 00 00
RSP: 0018:ffffc9000b2a7c80 EFLAGS: 00000202
RAX: 0000000004332101 RBX: ffff88802787d340 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8d9a73db RDI: 0000000000000001
RBP: 0000000000000021 R08: ffffffff8fa2d9f7 R09: 1ffffffff1f45b3e
R10: dffffc0000000000 R11: fffffbfff1f45b3f R12: 1ffff11004f0fafb
R13: 0000000000000000 R14: 000000001c000004 R15: ffff88802787d7d8
spin_unlock_irq include/linux/spinlock.h:404 [inline]
get_signal+0x11a7/0x1340 kernel/signal.c:3037
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
__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_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f037f38f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f03801690e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f037f5e5fa8 RCX: 00007f037f38f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f037f5e5fa8
RBP: 00007f037f5e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f037f5e6038 R14: 00007ffe1dce2ed0 R15: 00007ffe1dce2fb8