linux-ext4 - INFO: rcu detected stall in kjournald2

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Date:   Sun, 30 Oct 2022 18:10:42 +0800
From:   Wei Chen <harperchen1110@...il.com>
To:     tytso@....edu, jack@...e.com
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: INFO: rcu detected stall in kjournald2

Dear Linux Developer,

Recently when using our tool to fuzz kernel, the following crash was triggered:

HEAD commit: 64570fbc14f8 Linux 5.15-rc5
git tree: upstream
compiler: gcc 8.0.1
console output:
https://drive.google.com/file/d/1OdakNSSR2L4PKHjhh6f2qHTq_OzKJGMM/view?usp=share_link
kernel config: https://drive.google.com/file/d/1uDOeEYgJDcLiSOrx9W8v2bqZ6uOA_55t/view?usp=share_link

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: Wei Chen <harperchen1110@...il.com>

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu:  0-...!: (2 ticks this GP) idle=591/1/0x4000000000000000
softirq=22864/22864 fqs=1
  (t=11867 jiffies g=32309 q=191)
NMI backtrace for cpu 0
CPU: 0 PID: 2958 Comm: jbd2/sda-8 Not tainted 5.15.0-rc5 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0xcd/0x134
 nmi_cpu_backtrace.cold.8+0xf3/0x118
 nmi_trigger_cpumask_backtrace+0x18f/0x1c0
 rcu_dump_cpu_stacks+0x116/0x1e0
 rcu_sched_clock_irq.cold.108+0x221/0x459
 update_process_times+0xcf/0x130
 tick_sched_handle.isra.20+0x47/0xa0
 tick_sched_timer+0xa2/0xc0
 __hrtimer_run_queues+0x2ea/0x810
 hrtimer_interrupt+0x12b/0x2c0
 __sysvec_apic_timer_interrupt+0x9c/0x2c0
 sysvec_apic_timer_interrupt+0x99/0xc0
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x60
Code: 74 24 10 e8 8a a3 70 fc 48 89 ef e8 e2 d4 70 fc 81 e3 00 02 00
00 75 25 9c 58 f6 c4 02 75 2c 48 85 db 74 01 fb bf 01 00 00 00 <e8> e3
69 6c fc 65 8b 05 4c 17 42 7b 85 c0 74 0a 5b 5d c3 e8 70 e3
RSP: 0018:ffffc9000ae8f8f8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: ffff8881084b5280
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8881000c5a00 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88800d80a780
R13: 0000000000000246 R14: ffff888104496000 R15: ffff88800c7fd280
 ata_scsi_queuecmd+0x5e/0x90
 scsi_queue_rq+0x678/0x13e0
 blk_mq_dispatch_rq_list+0x209/0xd10
 __blk_mq_do_dispatch_sched+0x1ff/0x490
 __blk_mq_sched_dispatch_requests+0x16f/0x1f0
 blk_mq_sched_dispatch_requests+0x5e/0xb0
 __blk_mq_run_hw_queue+0x70/0xd0
 __blk_mq_delay_run_hw_queue+0x315/0x370
 blk_mq_run_hw_queue+0xb5/0x140
 blk_mq_sched_insert_requests+0x116/0x430
 blk_mq_flush_plug_list+0x1e4/0x3f0
 blk_flush_plug_list+0x137/0x160
 blk_finish_plug+0x32/0x50
 jbd2_journal_commit_transaction+0x1df1/0x3540
 kjournald2+0x106/0x430
 kthread+0x1a6/0x1e0
 ret_from_fork+0x1f/0x30
----------------
Code disassembly (best guess):
   0: 74 24                 je     0x26
   2: 10 e8                 adc    %ch,%al
   4: 8a a3 70 fc 48 89     mov    -0x76b70390(%rbx),%ah
   a: ef                    out    %eax,(%dx)
   b: e8 e2 d4 70 fc        callq  0xfc70d4f2
  10: 81 e3 00 02 00 00     and    $0x200,%ebx
  16: 75 25                 jne    0x3d
  18: 9c                    pushfq
  19: 58                    pop    %rax
  1a: f6 c4 02              test   $0x2,%ah
  1d: 75 2c                 jne    0x4b
  1f: 48 85 db              test   %rbx,%rbx
  22: 74 01                 je     0x25
  24: fb                    sti
  25: bf 01 00 00 00        mov    $0x1,%edi
* 2a: e8 e3 69 6c fc        callq  0xfc6c6a12 <-- trapping instruction
  2f: 65 8b 05 4c 17 42 7b  mov    %gs:0x7b42174c(%rip),%eax        # 0x7b421782
  36: 85 c0                 test   %eax,%eax
  38: 74 0a                 je     0x44
  3a: 5b                    pop    %rbx
  3b: 5d                    pop    %rbp
  3c: c3                    retq
  3d: e8                    .byte 0xe8
  3e: 70 e3                 jo     0x23

Best,
Wei