watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [aoe_tx0:3072]
Modules linked in:
irq event stamp: 18763
hardirqs last  enabled at (18762): [<ffffffff87400976>] restore_regs_and_return_to_kernel+0x0/0x2a
hardirqs last disabled at (18763): [<ffffffff874018ae>] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793
softirqs last  enabled at (748): [<ffffffff85c3ebb6>] rcu_read_unlock_bh include/linux/rcupdate.h:721 [inline]
softirqs last  enabled at (748): [<ffffffff85c3ebb6>] __dev_queue_xmit+0xc96/0x2480 net/core/dev.c:3548
softirqs last disabled at (758): [<ffffffff85c3e0cc>] __dev_queue_xmit+0x1ac/0x2480 net/core/dev.c:3455
CPU: 0 PID: 3072 Comm: aoe_tx0 Not tainted 4.14.249-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880ab5ea540 task.stack: ffff8880ab4b0000
RIP: 0010:fq_codel_dequeue+0xb6/0x2c10 net/sched/sch_fq_codel.c:303
RSP: 0018:ffff8880ab4b7b28 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff8880b2d906b8 RCX: ffff8880b2d906a8
RDX: 0000000000000000 RSI: ffff8880b2d906b8 RDI: ffff888092e08658
RBP: ffff8880b2d906c0 R08: 0000000000000001 R09: 000000000004850f
R10: ffff8880ab5eae18 R11: ffff8880ab5ea540 R12: ffff8880b2d90480
R13: dffffc0000000000 R14: ffff8880b2d90480 R15: ffff888092e08650
FS:  0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff88df2888 CR3: 00000000b30c1000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dequeue_skb net/sched/sch_generic.c:148 [inline]
 qdisc_restart net/sched/sch_generic.c:241 [inline]
 __qdisc_run+0x322/0xe00 net/sched/sch_generic.c:257
 __dev_xmit_skb net/core/dev.c:3231 [inline]
 __dev_queue_xmit+0x13ac/0x2480 net/core/dev.c:3489
 tx+0x68/0xa0 drivers/block/aoe/aoenet.c:63
 kthread+0x1b9/0x350 drivers/block/aoe/aoecmd.c:1259
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 48 c1 e8 03 42 80 3c 28 00 0f 85 3f 23 00 00 48 8b 04 24 4c 8b 38 49 8d 47 10 48 89 84 24 80 00 00 00 48 c1 e8 03 42 0f b6 04 28 <84> c0 74 08 3c 03 0f 8e 05 23 00 00 41 8b 5f 10 85 db 0f 8e 98 
----------------
Code disassembly (best guess):
   0:	48 c1 e8 03          	shr    $0x3,%rax
   4:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
   9:	0f 85 3f 23 00 00    	jne    0x234e
   f:	48 8b 04 24          	mov    (%rsp),%rax
  13:	4c 8b 38             	mov    (%rax),%r15
  16:	49 8d 47 10          	lea    0x10(%r15),%rax
  1a:	48 89 84 24 80 00 00 	mov    %rax,0x80(%rsp)
  21:	00
  22:	48 c1 e8 03          	shr    $0x3,%rax
  26:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
* 2b:	84 c0                	test   %al,%al <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	3c 03                	cmp    $0x3,%al
  31:	0f 8e 05 23 00 00    	jle    0x233c
  37:	41 8b 5f 10          	mov    0x10(%r15),%ebx
  3b:	85 db                	test   %ebx,%ebx
  3d:	0f                   	.byte 0xf
  3e:	8e                   	.byte 0x8e
  3f:	98                   	cwtl