rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=5c7/1/0x4000000000000000 softirq=173154/173155 fqs=5244
(t=10502 jiffies g=213701 q=1845)
NMI backtrace for cpu 0
CPU: 0 PID: 1228 Comm: aoe_tx0 Not tainted 5.16.0-rc6-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+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:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline]
RIP: 0010:arch_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:1163 [inline]
RIP: 0010:arch_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:1183 [inline]
RIP: 0010:atomic_add_unless include/linux/atomic/atomic-instrumented.h:571 [inline]
RIP: 0010:uart_port_ref drivers/tty/serial/serial_core.c:60 [inline]
RIP: 0010:uart_write+0xcb/0x570 drivers/tty/serial/serial_core.c:577
Code: 9d 98 03 00 00 e8 35 58 36 fd 31 ff 89 de e8 4c 5a 36 fd 85 db 0f 84 cc 02 00 00 e8 1f 58 36 fd 8d 53 01 89 d8 f0 41 0f b1 16 <41> 0f 94 c7 31 ff 89 c3 44 89 fe e8 e5 5b 36 fd 45 84 ff 74 c6 e8
RSP: 0018:ffffc9000533faa0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff84408071 RDI: 0000000000000003
RBP: ffff8881471c0be8 R08: 0000000000000000 R09: ffff8881471c0f83
R10: ffffffff84408064 R11: 0000000000000000 R12: 0000000000000020
R13: ffff88801599d0b0 R14: ffff8881471c0f80 R15: 0000000000000000
handle_tx+0x204/0x610 drivers/net/caif/caif_serial.c:236
__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+0x1eb/0x920 net/core/dev.c:3606
__dev_queue_xmit+0x299a/0x3650 net/core/dev.c:4229
tx+0x68/0xb0 drivers/block/aoe/aoenet.c:63
kthread+0x1e7/0x3b0 drivers/block/aoe/aoecmd.c:1230
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 9d popfq
1: 98 cwtl
2: 03 00 add (%rax),%eax
4: 00 e8 add %ch,%al
6: 35 58 36 fd 31 xor $0x31fd3658,%eax
b: ff 89 de e8 4c 5a decl 0x5a4ce8de(%rcx)
11: 36 fd ss std
13: 85 db test %ebx,%ebx
15: 0f 84 cc 02 00 00 je 0x2e7
1b: e8 1f 58 36 fd callq 0xfd36583f
20: 8d 53 01 lea 0x1(%rbx),%edx
23: 89 d8 mov %ebx,%eax
25: f0 41 0f b1 16 lock cmpxchg %edx,(%r14)
* 2a: 41 0f 94 c7 sete %r15b <-- trapping instruction
2e: 31 ff xor %edi,%edi
30: 89 c3 mov %eax,%ebx
32: 44 89 fe mov %r15d,%esi
35: e8 e5 5b 36 fd callq 0xfd365c1f
3a: 45 84 ff test %r15b,%r15b
3d: 74 c6 je 0x5
3f: e8 .byte 0xe8