rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=73b/1/0x4000000000000000 softirq=86173/86174 fqs=5100
(t=10500 jiffies g=115309 q=1341)
NMI backtrace for cpu 0
CPU: 0 PID: 1228 Comm: aoe_tx0 Not tainted 5.16.0-rc7-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+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x22d/0x390 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+0x1e33/0x2bc0 kernel/rcu/tree.c:2597
update_process_times+0x197/0x200 kernel/time/timer.c:1785
tick_sched_handle kernel/time/tick-sched.c:226 [inline]
tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:handle_tx+0x387/0x630 drivers/net/caif/caif_serial.c:250
Code: e8 6e 69 84 fc 48 01 5d 00 31 ff 89 de e8 b1 fe 39 fc 85 db 0f 88 62 01 00 00 4c 89 ff 44 89 ee e8 3e c0 c8 02 48 8b 44 24 58 <42> 0f b6 04 30 84 c0 0f 85 a2 00 00 00 48 8b 44 24 10 8b 18 31 ff
RSP: 0018:ffffc9000569fa08 EFLAGS: 00000282
RAX: 1ffff1100fb102ae RBX: 0000000000000000 RCX: ffff88801d9c5700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffff8880768ae140 R08: ffffffff8813443e R09: ffffed1028e0f1f1
R10: ffffed1028e0f1f1 R11: 0000000000000000 R12: ffff8880768aed08
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88807d881500
__netdev_start_xmit include/linux/netdevice.h:4994 [inline]
netdev_start_xmit include/linux/netdevice.h:5008 [inline]
xmit_one net/core/dev.c:3590 [inline]
dev_hard_start_xmit+0x20b/0x450 net/core/dev.c:3606
__dev_queue_xmit+0x1adc/0x35c0 net/core/dev.c:4229
tx+0x6f/0x110 drivers/block/aoe/aoenet.c:63
kthread+0x241/0x450 drivers/block/aoe/aoecmd.c:1230
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
----------------
Code disassembly (best guess):
0: e8 6e 69 84 fc callq 0xfc846973
5: 48 01 5d 00 add %rbx,0x0(%rbp)
9: 31 ff xor %edi,%edi
b: 89 de mov %ebx,%esi
d: e8 b1 fe 39 fc callq 0xfc39fec3
12: 85 db test %ebx,%ebx
14: 0f 88 62 01 00 00 js 0x17c
1a: 4c 89 ff mov %r15,%rdi
1d: 44 89 ee mov %r13d,%esi
20: e8 3e c0 c8 02 callq 0x2c8c063
25: 48 8b 44 24 58 mov 0x58(%rsp),%rax
* 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 a2 00 00 00 jne 0xd9
37: 48 8b 44 24 10 mov 0x10(%rsp),%rax
3c: 8b 18 mov (%rax),%ebx
3e: 31 ff xor %edi,%edi