rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10500 ticks this GP) idle=8a9/1/0x4000000000000000 softirq=32901/32901 fqs=1
(t=10502 jiffies g=52885 q=19)
rcu: rcu_preempt kthread starved for 10501 jiffies! g52885 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: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:1955
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16919 Comm: syz-executor.3 Not tainted 5.15.0-rc2-next-20210922-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:87 [inline]
RIP: 0010:do_raw_spin_lock+0xe0/0x2b0 kernel/locking/spinlock_debug.c:114
Code: 04 25 40 70 02 00 48 39 c2 0f 84 56 01 00 00 4c 8d 65 08 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f b6 04 02 84 c0 <74> 08 3c 03 0f 8e 66 01 00 00 8b 55 08 65 8b 05 94 20 a6 7e 39 c2
RSP: 0018:ffffc90004f97668 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff920009f2ece RCX: 0000000000000000
RDX: 1ffff11006aa24c2 RSI: 0000000000000201 RDI: ffff88803551260c
RBP: ffff888035512608 R08: 0000000000000000 R09: ffffffff8fd0c9cf
R10: fffffbfff1fa1939 R11: 0000000000000000 R12: ffff888035512610
R13: ffff888035512618 R14: ffff888035512608 R15: ffff888024478bc0
FS: 00007f7a77a7c700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ed2f000 CR3: 0000000075a0b000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_lock_bh include/linux/spinlock.h:373 [inline]
lock_sock_fast+0x5d/0x100 net/core/sock.c:3232
mptcp_subflow_cleanup_rbuf net/mptcp/protocol.c:465 [inline]
mptcp_cleanup_rbuf net/mptcp/protocol.c:499 [inline]
mptcp_recvmsg+0xad3/0x27b0 net/mptcp/protocol.c:2027
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: 0033:0x7f7a7a526709
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:00007f7a77a7c188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f7a7a62b020 RCX: 00007f7a7a526709
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00007f7a7a580cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc6a3133df R14: 00007f7a77a7c300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 16922 Comm: syz-executor.5 Not tainted 5.15.0-rc2-next-20210922-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_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 ca 5b 26 f8 48 89 ef e8 12 d2 26 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 93 6f 1a f8 65 8b 05 dc 49 cd 76 85 c0 74 0a 5b 5d c3 e8 d0 46
RSP: 0018:ffffc90004bef720 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1faaede
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff88803cf5d440 R08: 0000000000000001 R09: ffffffff8fd0ca07
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88803c908060
R13: ffffc90004bef828 R14: dffffc0000000000 R15: ffff88803c908000
mptcp_wait_data net/mptcp/protocol.c:1767 [inline]
mptcp_recvmsg+0xf5b/0x27b0 net/mptcp/protocol.c:2080
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: 0033:0x7f7b35a1e709
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:00007f7b32f74188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f7b35b23020 RCX: 00007f7b35a1e709
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00007f7b35a78cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe1bd3a68f R14: 00007f7b32f74300 R15: 0000000000022000
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 25 40 70 02 00 and $0x27040,%eax
5: 48 39 c2 cmp %rax,%rdx
8: 0f 84 56 01 00 00 je 0x164
e: 4c 8d 65 08 lea 0x8(%rbp),%r12
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 4c 89 e2 mov %r12,%rdx
1f: 48 c1 ea 03 shr $0x3,%rdx
23: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax
27: 84 c0 test %al,%al
* 29: 74 08 je 0x33 <-- trapping instruction
2b: 3c 03 cmp $0x3,%al
2d: 0f 8e 66 01 00 00 jle 0x199
33: 8b 55 08 mov 0x8(%rbp),%edx
36: 65 8b 05 94 20 a6 7e mov %gs:0x7ea62094(%rip),%eax # 0x7ea620d1
3d: 39 c2 cmp %eax,%edx