rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=4bf/1/0x4000000000000000 softirq=42491/42491 fqs=5
(t=10501 jiffies g=76525 q=91)
rcu: rcu_preempt kthread starved for 10492 jiffies! g76525 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: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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 19462 Comm: syz-executor.3 Not tainted 5.15.0-rc3-next-20210927-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:816 [inline]
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline]
RIP: 0010:lock_acquire+0x44d/0x510 kernel/locking/lockdep.c:5596
Code: ff ff 0f 1f 44 00 00 e9 59 fc ff ff 65 ff 05 ea e2 a6 7e 48 8b 05 43 b7 fe 0b e8 ae ca 05 00 85 c0 74 17 65 ff 0d d3 e2 a6 7e <0f> 85 78 fc ff ff 0f 1f 44 00 00 e9 6e fc ff ff e8 5e dc d6 07 85
RSP: 0018:ffffc90005a37608 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff92000b46ec3 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000202 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffff8880b9c3aa0b
R10: ffffed1017387541 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88802c139820 R15: 0000000000000000
FS: 00007fee0bb1f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba830361b8 CR3: 000000007216f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:373 [inline]
lock_sock_nested+0x5d/0xf0 net/core/sock.c:3186
lock_sock include/net/sock.h:1600 [inline]
mptcp_wait_data net/mptcp/protocol.c:1812 [inline]
mptcp_recvmsg+0x1047/0x27b0 net/mptcp/protocol.c:2122
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: 0033:0x7fee0e5a8709
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:00007fee0bb1f188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fee0e6acf60 RCX: 00007fee0e5a8709
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007fee0e602cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff70956cff R14: 00007fee0bb1f300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 19464 Comm: syz-executor.1 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_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:3882 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 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:check_kcov_mode+0x2e/0x40 kernel/kcov.c:174
Code: 36 8c 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 ac 15 00 00 85 d2 74 0b 8b 86 88 15 00 00 39 f8 <0f> 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0 65 8b
RSP: 0018:ffffc90005a47728 EFLAGS: 00000297
RAX: 0000000000000002 RBX: 0000000000020000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff888017cb8000 RDI: 0000000000000003
RBP: ffff888073503cc0 R08: 000000000000001f R09: ffff888073503cc3
R10: ffffffff88e92ba8 R11: 0000000000000000 R12: ffff88807350431c
R13: 0000000000000001 R14: dffffc0000000000 R15: ffff888073503ac0
write_comp_data kernel/kcov.c:218 [inline]
__sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:284
tcp_win_from_space include/net/tcp.h:1407 [inline]
__mptcp_space net/mptcp/protocol.h:314 [inline]
mptcp_cleanup_rbuf net/mptcp/protocol.c:489 [inline]
mptcp_recvmsg+0x858/0x27b0 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: 0033:0x7f727e60c709
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:00007f727bb41188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f727e7110e0 RCX: 00007f727e60c709
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007f727e666cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff805f797f R14: 00007f727bb41300 R15: 0000000000022000
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
5: e9 59 fc ff ff jmpq 0xfffffc63
a: 65 ff 05 ea e2 a6 7e incl %gs:0x7ea6e2ea(%rip) # 0x7ea6e2fb
11: 48 8b 05 43 b7 fe 0b mov 0xbfeb743(%rip),%rax # 0xbfeb75b
18: e8 ae ca 05 00 callq 0x5cacb
1d: 85 c0 test %eax,%eax
1f: 74 17 je 0x38
21: 65 ff 0d d3 e2 a6 7e decl %gs:0x7ea6e2d3(%rip) # 0x7ea6e2fb
* 28: 0f 85 78 fc ff ff jne 0xfffffca6 <-- trapping instruction
2e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
33: e9 6e fc ff ff jmpq 0xfffffca6
38: e8 5e dc d6 07 callq 0x7d6dc9b
3d: 85 .byte 0x85