rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1):
(detected by 0, t=10502 jiffies, g=411017, q=47)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295186267-4295175767), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g411017 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:28880 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 9384 Comm: syz-executor.4 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
print_other_cpu_stall kernel/rcu/tree_stall.h:584 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq+0x2001/0x20c0 kernel/rcu/tree.c:2641
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:121 [inline]
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:435 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x3c4/0xb40 kernel/locking/qspinlock.c:508
Code: 00 48 c1 e9 03 83 e3 07 41 be 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 2c 01 eb 0c f3 90 41 83 ec 01 0f 84 72 04 00 00 <41> 0f b6 45 00 38 d8 7f 08 84 c0 0f 85 91 05 00 00 0f b6 45 00 84
RSP: 0018:ffffc90000007a30 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff18efae4
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: ffffffff8c77d722
RBP: ffffffff8c77d720 R08: 0000000000000001 R09: ffffffff8c77d723
R10: fffffbfff18efae4 R11: 0000000000000080 R12: 0000000000007a96
R13: fffffbfff18efae4 R14: 0000000000000001 R15: ffff8880b9c52840
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
spin_lock include/linux/spinlock.h:354 [inline]
mac80211_hwsim_tx_frame_no_nl.isra.0+0x68f/0x1330 drivers/net/wireless/mac80211_hwsim.c:1516
mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784
mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838
__iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6326
Code: 55 53 65 48 8b 1c 25 40 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 e2 26 1e f8 e8 fd 72 4a f8 fb bf 01 00 00 00 d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 f0 15 1e
RSP: 0018:ffffc90012c4f3c8 EFLAGS: 00000202
RAX: 00000000000040b9 RBX: ffff8880182e1c40 RCX: 1ffffffff1fa8a2a
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed100305c388 R08: 0000000000000001 R09: ffffffff8fcfa9a7
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:rmqueue mm/page_alloc.c:3744 [inline]
RIP: 0010:get_page_from_freelist+0x8c1/0x2f80 mm/page_alloc.c:4165
Code: e8 54 71 a8 ff 48 83 7c 24 60 00 0f 85 8e 12 00 00 9c 58 f6 c4 02 0f 85 f6 17 00 00 48 83 7c 24 60 00 74 01 fb 48 8b 44 24 28 <49> 8d 9e b8 05 00 00 48 85 c0 0f 84 66 0f 00 00 48 c1 e8 03 42 80
RSP: 0018:ffffc90012c4f490 EFLAGS: 00000206
RAX: ffffea0001db80c0 RBX: 0000000000000000 RCX: 1ffffffff1fa8a2a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880b9c4d600 R08: 0000000000000001 R09: ffffffff8fcfa9a7
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b9c4d628
R13: dffffc0000000000 R14: ffff88813fffb700 R15: 0000000000000000
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5390
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
__get_free_pages+0x8/0x40 mm/page_alloc.c:5427
genradix_alloc_node lib/generic-radix-tree.c:83 [inline]
__genradix_ptr_alloc+0x21c/0x3c0 lib/generic-radix-tree.c:145
__genradix_prealloc+0x56/0x90 lib/generic-radix-tree.c:223
sctp_stream_alloc_out net/sctp/stream.c:93 [inline]
sctp_stream_init+0x392/0x5f0 net/sctp/stream.c:138
sctp_connect_new_asoc+0x645/0x770 net/sctp/socket.c:1110
sctp_sendmsg_new_asoc net/sctp/socket.c:1690 [inline]
sctp_sendmsg+0x13bc/0x1d30 net/sctp/socket.c:2000
inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
___sys_sendmsg+0xf3/0x170 net/socket.c:2457
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb8dee6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffdfd0a438f R14: 00007fbb8dee6300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 00 48 c1 add %cl,-0x3f(%rax)
3: e9 03 83 e3 07 jmpq 0x7e3830b
8: 41 be 01 00 00 00 mov $0x1,%r14d
e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
15: fc ff df
18: 4c 8d 2c 01 lea (%rcx,%rax,1),%r13
1c: eb 0c jmp 0x2a
1e: f3 90 pause
20: 41 83 ec 01 sub $0x1,%r12d
24: 0f 84 72 04 00 00 je 0x49c
* 2a: 41 0f b6 45 00 movzbl 0x0(%r13),%eax <-- trapping instruction
2f: 38 d8 cmp %bl,%al
31: 7f 08 jg 0x3b
33: 84 c0 test %al,%al
35: 0f 85 91 05 00 00 jne 0x5cc
3b: 0f b6 45 00 movzbl 0x0(%rbp),%eax
3f: 84 .byte 0x84