rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10501 ticks this GP) idle=225/1/0x4000000000000000 softirq=79015/79015 fqs=0
(t=10502 jiffies g=113169 q=2209)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g113169 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=64903
rcu: rcu_preempt kthread starved for 10505 jiffies! g113169 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:I stack:28720 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4986 [inline]
__schedule+0xab2/0x4e90 kernel/sched/core.c:6296
schedule+0xd2/0x260 kernel/sched/core.c:6369
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1971
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2144
kthread+0x2e9/0x3a0 kernel/kthread.c:377
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 1
CPU: 1 PID: 1236 Comm: aoe_tx0 Not tainted 5.16.0-rc6-next-20211224-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 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_cpu_stall kernel/rcu/tree_stall.h:602 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3920 [inline]
rcu_sched_clock_irq.cold+0x57/0x759 kernel/rcu/tree.c:2625
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:handle_tx+0x18a/0x610 drivers/net/caif/caif_serial.c:236
Code: e8 4b 71 86 fc 45 85 f6 0f 84 43 02 00 00 e8 1d 6f 86 fc 44 39 3d 76 99 96 07 49 8d bc 24 d0 00 00 00 44 0f 4e 3d 66 99 96 07 <48> 89 fa 45 39 f7 45 0f 4e f7 48 c1 ea 03 44 0f b6 3d 10 f9 8d 0b
RSP: 0018:ffffc90005e2fb28 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88802f81ecc0 RCX: 0000000000000000
RDX: ffff88801d3a0000 RSI: ffffffff84f19563 RDI: ffff8880790f2990
RBP: dffffc0000000000 R08: 0000000000000000 R09: 000000001a880b00
R10: ffffffff84f19555 R11: 0000000000000000 R12: ffff8880790f28c0
R13: ffff88807cd92000 R14: 0000000000000fff R15: 0000000000000020
__netdev_start_xmit include/linux/netdevice.h:4678 [inline]
netdev_start_xmit include/linux/netdevice.h:4692 [inline]
xmit_one net/core/dev.c:3473 [inline]
dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3489
__dev_queue_xmit+0x2983/0x3640 net/core/dev.c:4116
tx+0x68/0xb0 drivers/block/aoe/aoenet.c:63
kthread+0x1e7/0x3b0 drivers/block/aoe/aoecmd.c:1230
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 1
CPU: 1 PID: 1236 Comm: aoe_tx0 Not tainted 5.16.0-rc6-next-20211224-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x262/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3920 [inline]
rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2625
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:handle_tx+0x18a/0x610 drivers/net/caif/caif_serial.c:236
Code: e8 4b 71 86 fc 45 85 f6 0f 84 43 02 00 00 e8 1d 6f 86 fc 44 39 3d 76 99 96 07 49 8d bc 24 d0 00 00 00 44 0f 4e 3d 66 99 96 07 <48> 89 fa 45 39 f7 45 0f 4e f7 48 c1 ea 03 44 0f b6 3d 10 f9 8d 0b
RSP: 0018:ffffc90005e2fb28 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88802f81ecc0 RCX: 0000000000000000
RDX: ffff88801d3a0000 RSI: ffffffff84f19563 RDI: ffff8880790f2990
RBP: dffffc0000000000 R08: 0000000000000000 R09: 000000001a880b00
R10: ffffffff84f19555 R11: 0000000000000000 R12: ffff8880790f28c0
R13: ffff88807cd92000 R14: 0000000000000fff R15: 0000000000000020
__netdev_start_xmit include/linux/netdevice.h:4678 [inline]
netdev_start_xmit include/linux/netdevice.h:4692 [inline]
xmit_one net/core/dev.c:3473 [inline]
dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3489
__dev_queue_xmit+0x2983/0x3640 net/core/dev.c:4116
tx+0x68/0xb0 drivers/block/aoe/aoenet.c:63
kthread+0x1e7/0x3b0 drivers/block/aoe/aoecmd.c:1230
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: e8 4b 71 86 fc callq 0xfc867150
5: 45 85 f6 test %r14d,%r14d
8: 0f 84 43 02 00 00 je 0x251
e: e8 1d 6f 86 fc callq 0xfc866f30
13: 44 39 3d 76 99 96 07 cmp %r15d,0x7969976(%rip) # 0x7969990
1a: 49 8d bc 24 d0 00 00 lea 0xd0(%r12),%rdi
21: 00
22: 44 0f 4e 3d 66 99 96 cmovle 0x7969966(%rip),%r15d # 0x7969990
29: 07
* 2a: 48 89 fa mov %rdi,%rdx <-- trapping instruction
2d: 45 39 f7 cmp %r14d,%r15d
30: 45 0f 4e f7 cmovle %r15d,%r14d
34: 48 c1 ea 03 shr $0x3,%rdx
38: 44 0f b6 3d 10 f9 8d movzbl 0xb8df910(%rip),%r15d # 0xb8df950
3f: 0b