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Message-ID: <693955c1.a70a0220.33cd7b.0005.GAE@google.com>
Date: Wed, 10 Dec 2025 03:13:05 -0800
From: syzbot <syzbot+eadd98df8bceb15d7fed@...kaller.appspotmail.com>
To: hariconscious@...il.com, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] memory leak in btrfs_read_chunk_tree
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in btrfs_read_chunk_tree
BUG: memory leak
unreferenced object 0xffff88812ca1a800 (size 512):
comm "syz.0.17", pid 6724, jiffies 4294946683
hex dump (first 32 bytes):
00 fe 44 da de 57 40 6a 82 41 57 ec 7d 44 12 cf ..D..W@...W.}D..
00 fe 44 da de 57 40 6a 82 41 57 ec 7d 44 12 cf ..D..W@...W.}D..
backtrace (crc b9deaaec):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
__kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
alloc_fs_devices+0x20/0xc0 fs/btrfs/volumes.c:381
open_seed_devices fs/btrfs/volumes.c:7125 [inline]
read_one_dev fs/btrfs/volumes.c:7181 [inline]
btrfs_read_chunk_tree+0xa8f/0xd20 fs/btrfs/volumes.c:7478
open_ctree+0xddd/0x23e0 fs/btrfs/disk-io.c:3443
btrfs_fill_super fs/btrfs/super.c:983 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1946 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline]
btrfs_get_tree+0x735/0xe00 fs/btrfs/super.c:2123
vfs_get_tree+0x31/0x120 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x5b5/0x1320 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff88811a7cb400 (size 1024):
comm "syz.0.17", pid 6724, jiffies 4294946683
hex dump (first 32 bytes):
90 a8 a1 2c 81 88 ff ff 90 a8 a1 2c 81 88 ff ff ...,.......,....
10 b4 7c 1a 81 88 ff ff 10 b4 7c 1a 81 88 ff ff ..|.......|.....
backtrace (crc 1c3757e):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
__kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
btrfs_alloc_device+0x5c/0x1f0 fs/btrfs/volumes.c:6860
add_missing_dev+0x4b/0xf0 fs/btrfs/volumes.c:6820
read_one_dev fs/btrfs/volumes.c:7196 [inline]
btrfs_read_chunk_tree+0x7cf/0xd20 fs/btrfs/volumes.c:7478
open_ctree+0xddd/0x23e0 fs/btrfs/disk-io.c:3443
btrfs_fill_super fs/btrfs/super.c:983 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1946 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline]
btrfs_get_tree+0x735/0xe00 fs/btrfs/super.c:2123
vfs_get_tree+0x31/0x120 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x5b5/0x1320 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff88812ca1be00 (size 512):
comm "syz.0.18", pid 6765, jiffies 4294946709
hex dump (first 32 bytes):
00 fe 44 da de 57 40 6a 82 41 57 ec 7d 44 12 cf ..D..W@...W.}D..
00 fe 44 da de 57 40 6a 82 41 57 ec 7d 44 12 cf ..D..W@...W.}D..
backtrace (crc e80f9fa6):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
__kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
alloc_fs_devices+0x20/0xc0 fs/btrfs/volumes.c:381
open_seed_devices fs/btrfs/volumes.c:7125 [inline]
read_one_dev fs/btrfs/volumes.c:7181 [inline]
btrfs_read_chunk_tree+0xa8f/0xd20 fs/btrfs/volumes.c:7478
open_ctree+0xddd/0x23e0 fs/btrfs/disk-io.c:3443
btrfs_fill_super fs/btrfs/super.c:983 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1946 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline]
btrfs_get_tree+0x735/0xe00 fs/btrfs/super.c:2123
vfs_get_tree+0x31/0x120 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x5b5/0x1320 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff88811a7c8800 (size 1024):
comm "syz.0.18", pid 6765, jiffies 4294946709
hex dump (first 32 bytes):
90 be a1 2c 81 88 ff ff 90 be a1 2c 81 88 ff ff ...,.......,....
10 88 7c 1a 81 88 ff ff 10 88 7c 1a 81 88 ff ff ..|.......|.....
backtrace (crc 8f04a734):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
__kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
btrfs_alloc_device+0x5c/0x1f0 fs/btrfs/volumes.c:6860
add_missing_dev+0x4b/0xf0 fs/btrfs/volumes.c:6820
read_one_dev fs/btrfs/volumes.c:7196 [inline]
btrfs_read_chunk_tree+0x7cf/0xd20 fs/btrfs/volumes.c:7478
open_ctree+0xddd/0x23e0 fs/btrfs/disk-io.c:3443
btrfs_fill_super fs/btrfs/super.c:983 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1946 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline]
btrfs_get_tree+0x735/0xe00 fs/btrfs/super.c:2123
vfs_get_tree+0x31/0x120 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x5b5/0x1320 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff888127bf8200 (size 512):
comm "syz.0.19", pid 6787, jiffies 4294946730
hex dump (first 32 bytes):
00 fe 44 da de 57 40 6a 82 41 57 ec 7d 44 12 cf ..D..W@...W.}D..
00 fe 44 da de 57 40 6a 82 41 57 ec 7d 44 12 cf ..D..W@...W.}D..
backtrace (crc abd95a3a):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
__kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
alloc_fs_devices+0x20/0xc0 fs/btrfs/volumes.c:381
open_seed_devices fs/btrfs/volumes.c:7125 [inline]
read_one_dev fs/btrfs/volumes.c:7181 [inline]
btrfs_read_chunk_tree+0xa8f/0xd20 fs/btrfs/volumes.c:7478
open_ctree+0xddd/0x23e0 fs/btrfs/disk-io.c:3443
btrfs_fill_super fs/btrfs/super.c:983 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1946 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline]
btrfs_get_tree+0x735/0xe00 fs/btrfs/super.c:2123
vfs_get_tree+0x31/0x120 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x5b5/0x1320 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff88810a2ff800 (size 1024):
comm "syz.0.19", pid 6787, jiffies 4294946730
hex dump (first 32 bytes):
90 82 bf 27 81 88 ff ff 90 82 bf 27 81 88 ff ff ...'.......'....
10 f8 2f 0a 81 88 ff ff 10 f8 2f 0a 81 88 ff ff ../......./.....
backtrace (crc d2573d23):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
__kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
btrfs_alloc_device+0x5c/0x1f0 fs/btrfs/volumes.c:6860
add_missing_dev+0x4b/0xf0 fs/btrfs/volumes.c:6820
read_one_dev fs/btrfs/volumes.c:7196 [inline]
btrfs_read_chunk_tree+0x7cf/0xd20 fs/btrfs/volumes.c:7478
open_ctree+0xddd/0x23e0 fs/btrfs/disk-io.c:3443
btrfs_fill_super fs/btrfs/super.c:983 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1946 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline]
btrfs_get_tree+0x735/0xe00 fs/btrfs/super.c:2123
vfs_get_tree+0x31/0x120 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x5b5/0x1320 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF
Tested on:
commit: 0048fbb4 Merge tag 'locking-futex-2025-12-10' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a8b992580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9a0268003e02068d
dashboard link: https://syzkaller.appspot.com/bug?extid=eadd98df8bceb15d7fed
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=1513da1a580000
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