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Date: Wed, 15 Sep 2021 10:20:36 +0800
From: Qu Wenruo <quwenruo.btrfs@....com>
To: Hao Sun <sunhao.th@...il.com>, clm@...com, dsterba@...e.com,
Josef Bacik <josef@...icpanda.com>, linux-btrfs@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: WARNING in btrfs_run_delayed_refs
On 2021/9/15 上午10:14, Hao Sun wrote:
> Hello,
>
> When using Healer to fuzz the latest Linux kernel, the following crash
> was triggered.
>
> HEAD commit: 6880fa6c5660 Linux 5.15-rc1
> git tree: upstream
> console output:
> https://drive.google.com/file/d/1gd0dl74MyvvVAYqsCDKSGmcfpZszD0kt/view?usp=sharing
> kernel config: https://drive.google.com/file/d/1rUzyMbe5vcs6khA3tL9EHTLJvsUdWcgB/view?usp=sharing
> C reproducer: https://drive.google.com/file/d/1WKQukijOJ7D0NYk1iKf47FESjYfAjrlz/view?usp=sharing
> Syzlang reproducer:
> https://drive.google.com/file/d/1Gi9-Mgbrjw1OI-ymO4zDVIFej2Qf4ppL/view?usp=sharing
>
> If you fix this issue, please add the following tag to the commit:
> Reported-by: Hao Sun <sunhao.th@...il.com>
>
> loop11: detected capacity change from 0 to 32768
> BTRFS info (device loop11): disk space caching is enabled
> BTRFS info (device loop11): has skinny extents
> BTRFS info (device loop11): enabling ssd optimizations
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
> CPU: 0 PID: 7769 Comm: syz-executor Not tainted 5.15.0-rc1 #16
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> Call Trace:
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
> fail_dump lib/fault-inject.c:52 [inline]
> should_fail+0x13c/0x160 lib/fault-inject.c:146
> should_failslab+0x5/0x10 mm/slab_common.c:1328
> slab_pre_alloc_hook.constprop.99+0x4e/0xc0 mm/slab.h:494
> slab_alloc_node mm/slub.c:3120 [inline]
> slab_alloc mm/slub.c:3214 [inline]
> kmem_cache_alloc+0x44/0x280 mm/slub.c:3219
> __btrfs_free_extent.isra.53+0x7b/0x1180 fs/btrfs/extent-tree.c:2942
> run_delayed_tree_ref fs/btrfs/extent-tree.c:1687 [inline]
> run_one_delayed_ref fs/btrfs/extent-tree.c:1711 [inline]
> btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1952 [inline]
> __btrfs_run_delayed_refs+0x83e/0x1a00 fs/btrfs/extent-tree.c:2017
> btrfs_run_delayed_refs+0xb1/0x2b0 fs/btrfs/extent-tree.c:2148
> btrfs_commit_transaction+0x7d/0x1430 fs/btrfs/transaction.c:2065
> btrfs_sync_fs+0x9a/0x430 fs/btrfs/super.c:1426
> btrfs_ioctl+0x209b/0x3be0 fs/btrfs/ioctl.c:4970
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:874 [inline]
> __se_sys_ioctl fs/ioctl.c:860 [inline]
> __x64_sys_ioctl+0xb6/0x100 fs/ioctl.c:860
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x46ae99
> Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48
> 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
> 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f8ac08c7c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046ae99
> RDX: 0000000000000000 RSI: 0000000000009408 RDI: 0000000000000003
> RBP: 00007f8ac08c7c80 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
> R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007ffccc1d6390
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 7769 at fs/btrfs/extent-tree.c:2150
> btrfs_run_delayed_refs+0x245/0x2b0 fs/btrfs/extent-tree.c:2150
This is again btrfs_abort_transaction().
This makes me wonder, should we add ENOMEM to abort transaction warning
condition to make the ENOMEM injection code happy.
Mind to test the following diff?
Thanks,
Qu
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8c6ee947a68d..6bc79f6716fa 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3548,7 +3548,8 @@ do {
\
/* Report first abort since mount */ \
if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
&((trans)->fs_info->fs_state))) { \
- if ((errno) != -EIO && (errno) != -EROFS) { \
+ if ((errno) != -EIO && (errno) != -EROFS && \
+ (errno) != -ENOMEM) { \
WARN(1, KERN_DEBUG \
"BTRFS: Transaction aborted (error %d)\n", \
(errno)); \
> Modules linked in:
> CPU: 0 PID: 7769 Comm: syz-executor Not tainted 5.15.0-rc1 #16
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> RIP: 0010:btrfs_run_delayed_refs+0x245/0x2b0 fs/btrfs/extent-tree.c:2150
> Code: 72 2d e8 ce a4 4d ff 8b 04 24 83 f8 fb 74 49 83 f8 e2 74 44 e8
> bc a4 4d ff 8b 04 24 48 c7 c7 38 25 39 85 89 c6 e8 db ab 38 ff <0f> 0b
> 8b 04 24 89 04 24 e8 9e a4 4d ff 8b 04 24 ba 66 08 00 00 4c
> RSP: 0018:ffffc9000509bcc8 EFLAGS: 00010286
> RAX: 0000000000000000 RBX: ffff888014054000 RCX: ffffc9000cb3c000
> RDX: 0000000000040000 RSI: ffffffff812d18bc RDI: 00000000ffffffff
> RBP: ffff888014054000 R08: 0000000000000000 R09: 0000000000000001
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801f13e800
> R13: ffff8880091b2000 R14: ffff88801f13e800 R15: 0000000000000000
> FS: 00007f8ac08c8700(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fc39085b000 CR3: 000000010e194000 CR4: 0000000000750ee0
> DR0: 0000000000003000 DR1: 0000000000001000 DR2: 0000000000010000
> DR3: 000000000000d000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
> btrfs_commit_transaction+0x7d/0x1430 fs/btrfs/transaction.c:2065
> btrfs_sync_fs+0x9a/0x430 fs/btrfs/super.c:1426
> btrfs_ioctl+0x209b/0x3be0 fs/btrfs/ioctl.c:4970
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:874 [inline]
> __se_sys_ioctl fs/ioctl.c:860 [inline]
> __x64_sys_ioctl+0xb6/0x100 fs/ioctl.c:860
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x46ae99
> Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48
> 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
> 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f8ac08c7c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046ae99
> RDX: 0000000000000000 RSI: 0000000000009408 RDI: 0000000000000003
> RBP: 00007f8ac08c7c80 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
> R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007ffccc1d6390
>
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