rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 0, t=10502 jiffies, g=348341, q=358)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295173156-4295162654), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g348341 f0x2 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:28696 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4955 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6236
schedule+0xd3/0x270 kernel/sched/core.c:6315
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1959
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2132
kthread+0x405/0x4f0 kernel/kthread.c:327
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: 27600 Comm: syz-executor.5 Not tainted 5.15.0-rc3-next-20210927-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:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:481
print_other_cpu_stall kernel/rcu/tree_stall.h:586 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:729 [inline]
rcu_pending kernel/rcu/tree.c:3882 [inline]
rcu_sched_clock_irq+0x2125/0x2200 kernel/rcu/tree.c:2601
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:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:debug_smp_processor_id+0x0/0x20 lib/smp_processor_id.c:60
Code: 38 e4 89 4d 8d 86 30 08 00 00 83 e9 01 e8 54 2f be ff 48 8b 74 24 28 48 c7 c7 20 39 e4 89 e8 43 2f be ff e8 6e f9 cc ff eb a2 <0f> 1f 44 00 00 48 c7 c6 60 39 e4 89 48 c7 c7 a0 39 e4 89 e9 a8 fe
RSP: 0018:ffffc900042f7640 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8161e5b4
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8880b9c3aa08
RBP: 1ffff9200085eed0 R08: 0000000000000000 R09: ffff8880b9c3aa0b
R10: ffffed1017387541 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000001
rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1169 [inline]
rcu_lockdep_current_cpu_online+0x2d/0x150 kernel/rcu/tree.c:1160
rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123
trace_lock_release include/trace/events/lock.h:58 [inline]
lock_release+0x522/0x720 kernel/locking/lockdep.c:5636
unlock_sock_fast include/net/sock.h:1631 [inline]
unlock_sock_fast include/net/sock.h:1624 [inline]
mptcp_subflow_cleanup_rbuf net/mptcp/protocol.c:468 [inline]
mptcp_cleanup_rbuf net/mptcp/protocol.c:499 [inline]
mptcp_recvmsg+0xb7f/0x27b0 net/mptcp/protocol.c:2069
inet6_recvmsg+0x11b/0x5e0 net/ipv6/af_inet6.c:659
sock_recvmsg_nosec net/socket.c:944 [inline]
____sys_recvmsg+0x527/0x600 net/socket.c:2626
___sys_recvmsg+0x127/0x200 net/socket.c:2670
do_recvmmsg+0x24d/0x6d0 net/socket.c:2764
__sys_recvmmsg net/socket.c:2843 [inline]
__do_sys_recvmmsg net/socket.c:2866 [inline]
__se_sys_recvmmsg net/socket.c:2859 [inline]
__x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2859
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: 0033:0x7f2bd3e46709
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:00007f2bd13bd188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f2bd3f4af60 RCX: 00007f2bd3e46709
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007f2bd3ea0cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe754ff1df R14: 00007f2bd13bd300 R15: 0000000000022000
----------------
Code disassembly (best guess), 1 bytes skipped:
0: e4 89 in $0x89,%al
2: 4d 8d 86 30 08 00 00 lea 0x830(%r14),%r8
9: 83 e9 01 sub $0x1,%ecx
c: e8 54 2f be ff callq 0xffbe2f65
11: 48 8b 74 24 28 mov 0x28(%rsp),%rsi
16: 48 c7 c7 20 39 e4 89 mov $0xffffffff89e43920,%rdi
1d: e8 43 2f be ff callq 0xffbe2f65
22: e8 6e f9 cc ff callq 0xffccf995
27: eb a2 jmp 0xffffffcb
* 29: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction
2e: 48 c7 c6 60 39 e4 89 mov $0xffffffff89e43960,%rsi
35: 48 c7 c7 a0 39 e4 89 mov $0xffffffff89e439a0,%rdi
3c: e9 .byte 0xe9
3d: a8 fe test $0xfe,%al