Message-ID: <CACkBjsbP4DpRNc0YNBzhYxtwSX1-7krBvFrWB2J3O1Kae3NgTg@mail.gmail.com>
Date:   Tue, 14 Sep 2021 10:24:23 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: WARNING in cow_file_range_inline

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/17DFBJtsnY_h29uJ65fGamMlGRVsIv31I/view?usp=sharing
kernel config: https://drive.google.com/file/d/1rUzyMbe5vcs6khA3tL9EHTLJvsUdWcgB/view?usp=sharing
Syzlang reproducer:
https://drive.google.com/file/d/1Ymq-g9WYhukVEb43nZbAJvrKeWVZkcrX/view?usp=sharing

Sorry, I don't have a C reproducer for this crash but have a Syzlang
reproducer. Also, hope the symbolized report can help.
Here are the instructions on how to execute Syzlang prog:
https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md

If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@...il.com>

FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 8122 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_alloc_delayed_extent_op fs/btrfs/delayed-ref.h:299 [inline]
 btrfs_alloc_tree_block+0x38c/0x670 fs/btrfs/extent-tree.c:4833
 __btrfs_cow_block+0x16f/0x7d0 fs/btrfs/ctree.c:415
 btrfs_cow_block+0x12a/0x300 fs/btrfs/ctree.c:570
 btrfs_search_slot+0x6b0/0xee0 fs/btrfs/ctree.c:1768
 btrfs_lookup_file_extent+0x66/0x90 fs/btrfs/file-item.c:244
 btrfs_drop_extents+0x174/0x1100 fs/btrfs/file.c:741
 cow_file_range_inline.constprop.69+0x570/0x8a0 fs/btrfs/inode.c:395
 cow_file_range+0x3f2/0x500 fs/btrfs/inode.c:1102
 btrfs_run_delalloc_range+0x720/0x950 fs/btrfs/inode.c:1959
 writepage_delalloc+0x158/0x1d0 fs/btrfs/extent_io.c:3798
 __extent_writepage+0x287/0x5f0 fs/btrfs/extent_io.c:4093
 extent_write_cache_pages+0x3a1/0x710 fs/btrfs/extent_io.c:5009
 extent_writepages+0x5f/0xe0 fs/btrfs/extent_io.c:5130
 do_writepages+0xec/0x260 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc+0xa4/0xf0 mm/filemap.c:400
 __filemap_fdatawrite_range mm/filemap.c:433 [inline]
 filemap_fdatawrite_range+0x60/0x80 mm/filemap.c:451
 btrfs_fdatawrite_range+0x23/0x70 fs/btrfs/file.c:3733
 start_ordered_ops.constprop.37+0x55/0x90 fs/btrfs/file.c:2077
 btrfs_sync_file+0xd3/0x760 fs/btrfs/file.c:2153
 vfs_fsync_range+0x48/0xa0 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2955 [inline]
 btrfs_file_write_iter+0x34f/0x510 fs/btrfs/file.c:2034
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write+0x18d/0x260 fs/read_write.c:507
 vfs_write+0x43b/0x4a0 fs/read_write.c:594
 ksys_write+0xd2/0x120 fs/read_write.c:647
 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:00007f56408e2c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99
RDX: 000000000000001b RSI: 0000000020005a00 RDI: 0000000000000008
RBP: 00007f56408e2c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000f
R13: 0000000000000000 R14: 000000000078c158 R15: 00007fff60e50b60
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8122 at fs/btrfs/inode.c:397
cow_file_range_inline.constprop.69+0x783/0x8a0 fs/btrfs/inode.c:397
Modules linked in:
CPU: 0 PID: 8122 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:cow_file_range_inline.constprop.69+0x783/0x8a0 fs/btrfs/inode.c:397
Code: a8 c8 19 00 00 03 72 24 e8 4a 74 4b ff 83 fb fb 74 3c 83 fb e2
74 37 e8 3b 74 4b ff 89 de 48 c7 c7 38 25 39 85 e8 5d 7b 36 ff <0f> 0b
e8 26 74 4b ff 48 8b 7c 24 08 89 d9 ba 8d 01 00 00 48 c7 c6
RSP: 0018:ffffc9000a407728 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 00000000fffffff4 RCX: ffffc9000275d000
RDX: 0000000000040000 RSI: ffffffff812d18bc RDI: 00000000ffffffff
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffc9000a407370 R11: 0000000000000004 R12: ffff888105540000
R13: 0000000000000000 R14: 000000000000001b R15: ffff888014754168
FS:  00007f56408e3700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 0000000106cdc000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 cow_file_range+0x3f2/0x500 fs/btrfs/inode.c:1102
 btrfs_run_delalloc_range+0x720/0x950 fs/btrfs/inode.c:1959
 writepage_delalloc+0x158/0x1d0 fs/btrfs/extent_io.c:3798
 __extent_writepage+0x287/0x5f0 fs/btrfs/extent_io.c:4093
 extent_write_cache_pages+0x3a1/0x710 fs/btrfs/extent_io.c:5009
 extent_writepages+0x5f/0xe0 fs/btrfs/extent_io.c:5130
 do_writepages+0xec/0x260 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc+0xa4/0xf0 mm/filemap.c:400
 __filemap_fdatawrite_range mm/filemap.c:433 [inline]
 filemap_fdatawrite_range+0x60/0x80 mm/filemap.c:451
 btrfs_fdatawrite_range+0x23/0x70 fs/btrfs/file.c:3733
 start_ordered_ops.constprop.37+0x55/0x90 fs/btrfs/file.c:2077
 btrfs_sync_file+0xd3/0x760 fs/btrfs/file.c:2153
 vfs_fsync_range+0x48/0xa0 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2955 [inline]
 btrfs_file_write_iter+0x34f/0x510 fs/btrfs/file.c:2034
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write+0x18d/0x260 fs/read_write.c:507
 vfs_write+0x43b/0x4a0 fs/read_write.c:594
 ksys_write+0xd2/0x120 fs/read_write.c:647
 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:00007f56408e2c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99
RDX: 000000000000001b RSI: 0000000020005a00 RDI: 0000000000000008
RBP: 00007f56408e2c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000f
R13: 0000000000000000 R14: 000000000078c158 R15: 00007fff60e50b60

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