rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 0, t=10502 jiffies, g=71181, q=46)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295004680-4294994178), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g71181 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:4965 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6246
schedule+0xd2/0x260 kernel/sched/core.c:6319
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
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: 20741 Comm: syz-executor.1 Not tainted 5.15.0-rc5-next-20211013-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:458
print_other_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:706 [inline]
rcu_pending kernel/rcu/tree.c:3889 [inline]
rcu_sched_clock_irq+0x2125/0x2200 kernel/rcu/tree.c:2608
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:__schedule+0xaa2/0x4940 kernel/sched/core.c:6125
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 68 2f 00 00 48 8b bd 70 ff ff ff 4d 89 65 10 4c 89 e6 e8 b6 e9 b1 f7 48 89 c7 e8 4e 10 02 f8 <48> 8b b5 f8 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 c7 04 06 00
RSP: 0018:ffffc900059cf770 EFLAGS: 00000206
RAX: 0000000000baad8b RBX: 0000000000000001 RCX: 1ffffffff1b1f491
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900059cf888 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817daaf8 R11: 0000000000000000 R12: ffff8880b9c3a500
R13: ffff8880b9c39a40 R14: 0000000000000000 R15: ffffffff8b545c80
schedule+0xd2/0x260 kernel/sched/core.c:6319
tty_open+0x885/0x1000 drivers/tty/tty_io.c:2153
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x11d0 fs/open.c:822
do_open fs/namei.c:3428 [inline]
path_openat+0x1c9a/0x2740 fs/namei.c:3561
do_filp_open+0x1aa/0x400 fs/namei.c:3588
do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
do_sys_open fs/open.c:1216 [inline]
__do_sys_openat fs/open.c:1232 [inline]
__se_sys_openat fs/open.c:1227 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
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: 0033:0x7f458fa62a39
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:00007f458cfd8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f458fb65f60 RCX: 00007f458fa62a39
RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
RBP: 00007f458fabcc5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffba82a6ef R14: 00007f458cfd8300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: fa cli
1: 48 c1 ea 03 shr $0x3,%rdx
5: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
9: 0f 85 68 2f 00 00 jne 0x2f77
f: 48 8b bd 70 ff ff ff mov -0x90(%rbp),%rdi
16: 4d 89 65 10 mov %r12,0x10(%r13)
1a: 4c 89 e6 mov %r12,%rsi
1d: e8 b6 e9 b1 f7 callq 0xf7b1e9d8
22: 48 89 c7 mov %rax,%rdi
25: e8 4e 10 02 f8 callq 0xf8021078
* 2a: 48 8b b5 f8 fe ff ff mov -0x108(%rbp),%rsi <-- trapping instruction
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 48 rex.W
3c: c7 .byte 0xc7
3d: 04 06 add $0x6,%al