rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=a13/1/0x4000000000000000 softirq=38409/38410 fqs=25
(t=10500 jiffies g=68401 q=224)
rcu: rcu_preempt kthread starved for 10438 jiffies! g68401 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: 20620 Comm: syz-executor.4 Not tainted 5.15.0-rc2-next-20210924-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:task_wait_context kernel/locking/lockdep.c:4628 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4709 [inline]
RIP: 0010:__lock_acquire+0x5c2/0x54a0 kernel/locking/lockdep.c:4965
Code: 38 c8 7f 08 84 c0 0f 85 f3 2b 00 00 0f b6 43 21 44 31 f8 a8 60 74 c1 41 83 c6 01 65 8b 05 3e 50 a7 7e 85 c0 0f 85 cb 0a 00 00 <48> b8 00 00 00 00 00 fc ff df 48 8b 5c 24 40 48 89 da 48 c1 ea 03
RSP: 0018:ffffc90004b2f4b8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88803f3d2768 RCX: 0000000000000001
RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffffffff8fd40f99
RBP: ffff88803f3d2761 R08: dffffc0000000000 R09: ffffffff8fd0d9cf
R10: fffffbfff1fa1b39 R11: 0000000000000442 R12: ffff88803f3d2790
R13: ffff88803f3d1d00 R14: 0000000000000000 R15: 0000000000000004
FS: 00007f7d009b7700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d00996718 CR3: 000000007d534000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
reacquire_held_locks+0x214/0x4e0 kernel/locking/lockdep.c:5153
__lock_release kernel/locking/lockdep.c:5341 [inline]
lock_release+0x339/0x720 kernel/locking/lockdep.c:5645
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:2044
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: 0033:0x7f7d03461709
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:00007f7d009b7188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f7d03566020 RCX: 00007f7d03461709
RDX: 0000000000000004 RSI: 0000000020000b00 RDI: 0000000000000004
RBP: 00007f7d034bbcb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0899987f R14: 00007f7d009b7300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 20603 Comm: syz-executor.3 Not tainted 5.15.0-rc2-next-20210924-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:__local_bh_enable_ip+0xa8/0x120 kernel/softirq.c:390
Code: 1d 9d 0c bc 7e 65 8b 05 96 0c bc 7e a9 00 ff ff 00 74 45 bf 01 00 00 00 e8 35 32 09 00 e8 f0 08 36 00 fb 65 8b 05 78 0c bc 7e <85> c0 74 58 5b 5d c3 65 8b 05 c6 13 bc 7e 85 c0 75 a2 0f 0b eb 9e
RSP: 0018:ffffc90004977720 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 00000000fffffe00 RCX: 1ffffffff1fab126
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff88e9112b R08: 0000000000000001 R09: ffffffff8fd0da07
R10: 0000000000000001 R11: 0000000000000442 R12: 0000000000000000
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000001
spin_unlock_bh include/linux/spinlock.h:413 [inline]
unlock_sock_fast include/net/sock.h:1632 [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+0xb8b/0x27b0 net/mptcp/protocol.c:2044
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: 0033:0x7f94bd916709
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:00007f94bae8d188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f94bda1af60 RCX: 00007f94bd916709
RDX: 0000000000000004 RSI: 0000000020000b00 RDI: 0000000000000004
RBP: 00007f94bd970cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffde2499d4f R14: 00007f94bae8d300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 38 c8 cmp %cl,%al
2: 7f 08 jg 0xc
4: 84 c0 test %al,%al
6: 0f 85 f3 2b 00 00 jne 0x2bff
c: 0f b6 43 21 movzbl 0x21(%rbx),%eax
10: 44 31 f8 xor %r15d,%eax
13: a8 60 test $0x60,%al
15: 74 c1 je 0xffffffd8
17: 41 83 c6 01 add $0x1,%r14d
1b: 65 8b 05 3e 50 a7 7e mov %gs:0x7ea7503e(%rip),%eax # 0x7ea75060
22: 85 c0 test %eax,%eax
24: 0f 85 cb 0a 00 00 jne 0xaf5
* 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction
31: fc ff df
34: 48 8b 5c 24 40 mov 0x40(%rsp),%rbx
39: 48 89 da mov %rbx,%rdx
3c: 48 c1 ea 03 shr $0x3,%rdx