linux-kernel - Re: kernel BUG in block

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Date:   Thu, 7 Oct 2021 06:23:11 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Hao Sun <sunhao.th@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: kernel BUG in block_invalidatepage

On 10/7/21 12:40 AM, Hao Sun wrote:
> Hello,
> 
> This crash can still be triggered repeatedly on the latest kernel.
> 
> HEAD commit: 60a9483534ed Merge tag 'warning-fixes-20211005'
> git tree: upstream
> kernel config: https://drive.google.com/file/d/1u-ncYGLkq3xqdlNQYJz8-G6Fhf3H-moP/view?usp=sharing
> 
> ------------[ cut here ]------------
> kernel BUG at fs/buffer.c:1514!
> invalid opcode: 0000 [#1] PREEMPT SMP
> CPU: 3 PID: 25416 Comm: syz-executor Not tainted 5.15.0-rc4+ #22
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> RIP: 0010:block_invalidatepage+0x27f/0x2a0 fs/buffer.c:1514
> Code: ff ff e8 b4 fd d6 ff b9 02 00 00 00 be 02 00 00 00 4c 89 ff 48
> c7 c2 40 b1 25 84 e8 8b 1b c5 02 e9 c9 fe ff ff e8 91 fd d6 ff <0f> 0b
> e8 8a fd d6 ff 0f 0b e8 83 fd d6 ff 48 8d 5d ff e9 57 ff ff
> RSP: 0018:ffffc9000538fa70 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffffea0004518000 RCX: 0000000000000000
> RDX: ffff88810dd2a280 RSI: ffffffff8160943f RDI: ffffea0004518000
> RBP: ffffea0004518000 R08: 0000000000000001 R09: 0000000000000000
> R10: ffffc9000538f908 R11: 0000000000000001 R12: ffffffff816091c0
> R13: ffffc9000538fb78 R14: 0000000000000000 R15: ffffc9000538fb00
> FS:  0000000000000000(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020590008 CR3: 000000000588a000 CR4: 0000000000750ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
>  do_invalidatepage mm/truncate.c:157 [inline]
>  truncate_cleanup_page+0x15c/0x280 mm/truncate.c:176
>  truncate_inode_pages_range+0x169/0xc20 mm/truncate.c:325
>  kill_bdev.isra.16+0x28/0x30 block/bdev.c:77
>  blkdev_flush_mapping+0x4c/0x130 block/bdev.c:658
>  blkdev_put_whole+0x54/0x60 block/bdev.c:689
>  blkdev_put+0x6f/0x210 block/bdev.c:953
>  blkdev_close+0x26/0x30 block/fops.c:460
>  __fput+0xdf/0x380 fs/file_table.c:280
>  task_work_run+0x86/0xd0 kernel/task_work.c:164
>  exit_task_work include/linux/task_work.h:32 [inline]
>  do_exit+0x4f1/0x11c0 kernel/exit.c:825
>  do_group_exit+0x57/0xe0 kernel/exit.c:922
>  get_signal+0x1d0/0x10b0 kernel/signal.c:2868
>  arch_do_signal_or_restart+0xa9/0x860 arch/x86/kernel/signal.c:865
>  handle_signal_work kernel/entry/common.c:148 [inline]
>  exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
>  exit_to_user_mode_prepare+0xf2/0x280 kernel/entry/common.c:207
>  __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
>  syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
>  do_syscall_64+0x40/0xb0 arch/x86/entry/common.c:86
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x4196af
> Code: Unable to access opcode bytes at RIP 0x419685.
> RSP: 002b:00007faeee07b9c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
> RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000004196af
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000003 R15: 000000002059c040
> Modules linked in:
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> ---[ end trace bb86c370c06fa387 ]---
> RIP: 0010:block_invalidatepage+0x27f/0x2a0 fs/buffer.c:1514
> Code: ff ff e8 b4 fd d6 ff b9 02 00 00 00 be 02 00 00 00 4c 89 ff 48
> c7 c2 40 b1 25 84 e8 8b 1b c5 02 e9 c9 fe ff ff e8 91 fd d6 ff <0f> 0b
> e8 8a fd d6 ff 0f 0b e8 83 fd d6 ff 48 8d 5d ff e9 57 ff ff
> RSP: 0018:ffffc9000538fa70 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffffea0004518000 RCX: 0000000000000000
> RDX: ffff88810dd2a280 RSI: ffffffff8160943f RDI: ffffea0004518000
> RBP: ffffea0004518000 R08: 0000000000000001 R09: 0000000000000000
> R10: ffffc9000538f908 R11: 0000000000000001 R12: ffffffff816091c0
> R13: ffffc9000538fb78 R14: 0000000000000000 R15: ffffc9000538fb00
> FS:  0000000000000000(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f397f798010 CR3: 0000000012392000 CR4: 0000000000750ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554

Some more details would be nice here... What's being run to trigger
this?

-- 
Jens Axboe