rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5812/1:b..l P6067/1:b..l P5187/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=31189, q=492 ncpus=2)
task:udevd state:R running task stack:23512 pid:5187 tgid:5187 ppid:1 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7051
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
sock_def_readable+0x154/0x5d0 net/core/sock.c:3611
__netlink_sendskb net/netlink/af_netlink.c:1263 [inline]
netlink_sendskb net/netlink/af_netlink.c:1269 [inline]
netlink_unicast+0x74c/0x870 net/netlink/af_netlink.c:1359
netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa54/0xc30 net/socket.c:2592
___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
__sys_sendmsg+0x170/0x220 net/socket.c:2678
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f270eaa7407
RSP: 002b:00007ffdbcd1b940 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f270f175880 RCX: 00007f270eaa7407
RDX: 0000000000000000 RSI: 00007ffdbcd1b9a0 RDI: 0000000000000004
RBP: 00005575dd850160 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000076
R13: 00005575dd603d80 R14: 0000000000000000 R15: 0000000000000000
task:kworker/u8:16 state:R running task stack:23256 pid:6067 tgid:6067 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7194
irqentry_exit+0x17b/0x670 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x19e/0x2e0 kernel/locking/lockdep.c:5893
Code: ff 65 0f c1 05 5b 5d 01 12 83 f8 01 0f 85 f7 00 00 00 9c 58 f6 c4 02 0f 85 0c 01 00 00 41 f7 c6 00 02 00 00 0f 85 99 00 00 00 <48> 8b 44 24 10 65 48 2b 05 ed 15 01 12 0f 85 0f 01 00 00 48 83 c4
RSP: 0018:ffffc9000561f618 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5e3360 RCX: ffffc9000561f624
RDX: 0000000000000003 RSI: ffffffff8dc1f455 RDI: ffffffff8bfa35a0
RBP: ffffffff81b6a38e R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000084554 R12: ffff8880275ec980
R13: ffffc9000561f6d0 R14: 0000000000000206 R15: 0000000000000004
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x3c3/0x1ea0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6674 [inline]
kmem_cache_free+0x143/0x720 mm/slub.c:6785
kfree_skbmem+0x19a/0x210 net/core/skbuff.c:1130
__kfree_skb net/core/skbuff.c:1197 [inline]
sk_skb_reason_drop+0x10f/0x1b0 net/core/skbuff.c:1234
kfree_skb_reason include/linux/skbuff.h:1322 [inline]
kfree_skb include/linux/skbuff.h:1331 [inline]
ieee80211_iface_work+0x46f/0x1350 net/mac80211/iface.c:1796
cfg80211_wiphy_work+0x3f7/0x560 net/wireless/core.c:438
process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
task:syz-executor state:R running task stack:23104 pid:5812 tgid:5812 ppid:5810 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7051
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1331 [inline]
copy_pmd_range mm/memory.c:1392 [inline]
copy_pud_range mm/memory.c:1429 [inline]
copy_p4d_range mm/memory.c:1453 [inline]
copy_page_range+0x1ddc/0x6ba0 mm/memory.c:1539
dup_mmap+0xbea/0x1e20 mm/mmap.c:1827
dup_mm kernel/fork.c:1529 [inline]
copy_mm kernel/fork.c:1581 [inline]
copy_process+0x7451/0x7890 kernel/fork.c:2221
kernel_clone+0xfc/0x930 kernel/fork.c:2651
__do_sys_clone+0xd9/0x120 kernel/fork.c:2792
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff69b7c3752
RSP: 002b:00007ffd613a8ef0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffd613a8ef0 RCX: 00007ff69b7c3752
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffd613a907c R08: 0000000000000000 R09: 0000000000000001
R10: 0000555575e607d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000534eb R15: 00007ffd613a90d0
rcu: rcu_preempt kthread starved for 10578 jiffies! g31189 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:28824 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x21e/0x320 kernel/rcu/tree.c:2285
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9484 Comm: syz.2.956 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write arch/x86/include/asm/apic.h:212 [inline]
RIP: 0010:native_apic_msr_write+0x28/0x40 arch/x86/include/asm/apic.h:206
Code: 90 90 f3 0f 1e fa 8d 87 30 ff ff ff 83 e0 ef 74 20 89 f8 83 e0 ef 83 f8 20 74 16 c1 ef 04 31 d2 89 f0 8d 8f 00 08 00 00 0f 30 <66> 90 c3 cc cc cc cc c3 cc cc cc cc 89 f6 31 d2 89 cf e9 51 98 67
RSP: 0018:ffffc90000007ec8 EFLAGS: 00000046
RAX: 000000000006278c RBX: ffff8880b8423f40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000006278c RDI: 0000000000000038
RBP: 000000000006278c R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000020 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000020 R15: ffff8880b8428440
FS: 00007fe65e1186c0(0000) GS:ffff8881245dc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000030ba7000 CR4: 00000000003526f0
Call Trace:
apic_write arch/x86/include/asm/apic.h:409 [inline]
lapic_next_event+0x10/0x20 arch/x86/kernel/apic/apic.c:418
clockevents_program_event+0x26e/0x360 kernel/time/clockevents.c:334
tick_program_event+0xa9/0x140 kernel/time/tick-oneshot.c:48
hrtimer_interrupt+0x3e9/0x8c0 kernel/time/hrtimer.c:1916
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x109/0x3c0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x330 kernel/locking/lockdep.c:5872
Code: 05 bb 1c 01 12 83 f8 07 0f 87 a4 02 00 00 48 0f a3 05 46 14 d4 0e 0f 82 6f 02 00 00 8b 35 de 44 d4 0e 85 f6 0f 85 8a 00 00 00 <48> 8b 44 24 30 65 48 2b 05 5d 1c 01 12 0f 85 b8 02 00 00 48 83 c4
RSP: 0018:ffffc900036d7d08 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8dc1f455 RDI: ffffffff8bfa35a0
RBP: ffff88813fe58f80 R08: 00000000f6c1f22c R09: 00000000000001c5
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
__might_fault+0xde/0x140 mm/memory.c:7177
_inline_copy_from_user include/linux/uaccess.h:169 [inline]
_copy_from_user+0x29/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:223 [inline]
restore_altstack+0x98/0x170 kernel/signal.c:4461
__do_sys_rt_sigreturn+0x1ab/0x2c0 arch/x86/kernel/signal_64.c:265
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe65d13c0d9
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007fe65e117400 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fe65d415fa8 RCX: 00007fe65d13c0d9
RDX: 00007fe65e117400 RSI: 00007fe65e117530 RDI: 0000000000000021
RBP: 00007fe65d415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fe65d416038 R14: 00007fff2e022550 R15: 00007fff2e022638