[syzbot] [bluetooth?] memory leak in init_srcu_struct_fields

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f377d0025eb0 Merge tag 'sh-for-v7.1-tag2' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1737bb48580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9645c21cfd1d3e8f
dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164ed748580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e6576c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5d8163677f58/disk-f377d002.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cf2fcdb8200b/vmlinux-f377d002.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e9fb70799318/bzImage-f377d002.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff888111f49600 (size 512):
comm "syz.0.17", pid 5937, jiffies 4294945495
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 6e7d3fde):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4574 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5414
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object (percpu) 0x607e4d93d800 (size 384):
comm "syz.0.17", pid 5937, jiffies 4294945495
hex dump (first 32 bytes on cpu 0):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):
pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1896
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object (percpu) 0x607e4d93d980 (size 384):
comm "syz.0.18", pid 5940, jiffies 4294945497
hex dump (first 32 bytes on cpu 0):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):
pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1896
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88811d010a00 (size 512):
comm "syz.0.19", pid 5951, jiffies 4294945502
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 2d3d1dd8):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4574 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5414
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object (percpu) 0x607e4d93db00 (size 384):
comm "syz.0.19", pid 5951, jiffies 4294945502
hex dump (first 32 bytes on cpu 0):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):
pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1896
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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[syzbot]

For archival purposes, forwarding an incoming command email to
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***

Subject: [PATCH] Bluetooth: hci_core: Fix SRCU leak when device is freed unregistered
Author: karti...@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master


hci_alloc_dev_priv() initializes hdev->srcu with init_srcu_struct(), but
the matching cleanup_srcu_struct() is only called from hci_unregister_dev().
A hci_dev that is allocated and then freed without ever being registered
leaks the SRCU internals - the node array and the per-CPU sda - even though
the hci_dev itself is freed correctly.

This is reachable from the hci_uart line discipline. h5_open() (used by the
HCI_UART_3WIRE protocol) sets HCI_UART_INIT_PENDING, so hci_uart_register_dev()
returns early without calling hci_register_dev() and HCI_UART_REGISTERED is
never set. Registration is deferred until the three-wire link is synced, which
never happens over a bare pty. When the tty is closed, hci_uart_tty_close()
finds HCI_UART_REGISTERED clear, skips hci_unregister_dev(), and calls
hci_free_dev() -> hci_release_dev() -> kfree(hdev), orphaning the SRCU
allocations.

kmemleak reports only the SRCU sub-objects, not hdev, confirming that hdev is
freed while its embedded srcu is not torn down:

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774

Pair the SRCU init with destruction by calling cleanup_srcu_struct() from
hci_release_dev(), so it runs on the final put_device() regardless of whether
the device was ever registered. Keep synchronize_srcu() in hci_unregister_dev()
to drain readers walking the device list before the device leaves it.

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
Signed-off-by: Deepanshu Kartikey <karti...@gmail.com>
---
net/bluetooth/hci_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 28d7929dc593..2d516beedb59 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2664,7 +2664,6 @@ void hci_unregister_dev(struct hci_dev *hdev)
write_unlock(&hci_dev_list_lock);

synchronize_srcu(&hdev->srcu);
- cleanup_srcu_struct(&hdev->srcu);

disable_work_sync(&hdev->rx_work);
disable_work_sync(&hdev->cmd_work);
@@ -2737,6 +2736,8 @@ void hci_release_dev(struct hci_dev *hdev)
kfree_skb(hdev->sent_cmd);
kfree_skb(hdev->req_skb);
kfree_skb(hdev->recv_event);
+
+ cleanup_srcu_struct(&hdev->srcu);
kfree(hdev);
}
EXPORT_SYMBOL(hci_release_dev);
--
2.43.0

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: [PATCH] Bluetooth: hci_core: Fix SRCU leak when device is freed unregistered
Author: karti...@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master



hci_alloc_dev_priv() initializes hdev->srcu with init_srcu_struct(), but
the matching cleanup_srcu_struct() is only called from hci_unregister_dev().
A hci_dev that is allocated and then freed without ever being registered
leaks the SRCU internals - the node array and the per-CPU sda - even though
the hci_dev itself is freed correctly.

This is reachable from the hci_uart line discipline. h5_open() (used by the
HCI_UART_3WIRE protocol) sets HCI_UART_INIT_PENDING, so hci_uart_register_dev()
returns early without calling hci_register_dev() and HCI_UART_REGISTERED is
never set. Registration is deferred until the three-wire link is synced, which
never happens over a bare pty. When the tty is closed, hci_uart_tty_close()
finds HCI_UART_REGISTERED clear, skips hci_unregister_dev(), and calls
hci_free_dev() -> hci_release_dev() -> kfree(hdev), orphaning the SRCU
allocations.

kmemleak reports only the SRCU sub-objects, not hdev, confirming that hdev is
freed while its embedded srcu is not torn down:

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in init_srcu_struct_fields

BUG: memory leak
unreferenced object 0xffff88810de6f800 (size 512):
comm "syz.0.17", pid 6610, jiffies 4294948707

hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace (crc 55438727):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4613 [inline]
slab_alloc_node mm/slub.c:4937 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5443
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1286 [inline]
init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806

tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object (percpu) 0x607e4db7f740 (size 384):
comm "syz.0.17", pid 6610, jiffies 4294948707

hex dump (first 32 bytes on cpu 0):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):

pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1956
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806

tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object (percpu) 0x607e4db7f8c0 (size 384):
comm "syz.0.18", pid 6619, jiffies 4294948711

hex dump (first 32 bytes on cpu 0):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):

pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1956
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806

tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object (percpu) 0x607e4db7fa40 (size 384):
comm "syz.0.19", pid 6624, jiffies 4294948716

hex dump (first 32 bytes on cpu 0):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):

pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1956
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806

tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xee/0x600 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: 7da7f071 Add linux-next specific files for 20260529
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14bf17a6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3dd1e35bbd92239d

dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=10cd7ed2580000

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: [PATCH] Bluetooth: hci_core: Fix SRCU leak when device is freed unregistered
Author: karti...@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

hci_alloc_dev_priv() initializes hdev->srcu with init_srcu_struct(), but
the matching cleanup_srcu_struct() is only called from hci_unregister_dev().
A hci_dev that is allocated and then freed without ever being registered
leaks the SRCU internals - the node array and the per-CPU sda - even though
the hci_dev itself is freed correctly.

This is reachable from the hci_uart line discipline. h5_open() (used by the
HCI_UART_3WIRE protocol) sets HCI_UART_INIT_PENDING, so hci_uart_register_dev()
returns early without calling hci_register_dev() and HCI_UART_REGISTERED is
never set. Registration is deferred until the three-wire link is synced, which
never happens over a bare pty. When the tty is closed, hci_uart_tty_close()
finds HCI_UART_REGISTERED clear, skips hci_unregister_dev(), and calls
hci_free_dev() -> hci_release_dev() -> kfree(hdev), orphaning the SRCU
allocations.

kmemleak reports only the SRCU sub-objects, not hdev, confirming that hdev is
freed while its embedded srcu is not torn down:

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2453
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:644 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:720 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:774

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in init_srcu_struct_fields

BUG: memory leak

unreferenced object (percpu) 0x607e4db7f7c0 (size 384):
comm "syz.0.17", pid 6615, jiffies 4294948617
hex dump (first 32 bytes on cpu 1):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):
pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1956
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416

hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]

hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object 0xffff88810de8e800 (size 512):
comm "syz.0.18", pid 6621, jiffies 4294948621

hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace (crc 4c023471):

kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4613 [inline]
slab_alloc_node mm/slub.c:4937 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5443
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1286 [inline]

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]

hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object (percpu) 0x607e4db7f940 (size 384):
comm "syz.0.18", pid 6621, jiffies 4294948621
hex dump (first 32 bytes on cpu 1):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):
pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1956
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416

hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]

hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object 0xffff88810de8fc00 (size 512):
comm "syz.0.19", pid 6630, jiffies 4294948624

hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace (crc a013f5be):

kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4613 [inline]
slab_alloc_node mm/slub.c:4937 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5443
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1286 [inline]

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]

hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object (percpu) 0x607e4db7fac0 (size 384):
comm "syz.0.19", pid 6630, jiffies 4294948624
hex dump (first 32 bytes on cpu 1):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):
pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1956
init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416

hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]

hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 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: 7da7f071 Add linux-next specific files for 20260529
git tree: linux-next

console output: https://syzkaller.appspot.com/x/log.txt?x=1395b36a580000

kernel config: https://syzkaller.appspot.com/x/.config?x=3dd1e35bbd92239d
dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=123de056580000

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in init_srcu_struct_fields

BUG: memory leak

unreferenced object 0xffff88810ace7000 (size 512):
comm "syz.0.17", pid 6583, jiffies 4294948651

hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace (crc 1a69216d):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4575 [inline]
slab_alloc_node mm/slub.c:4899 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5415
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object (percpu) 0x607e4d944640 (size 384):
comm "syz.0.17", pid 6583, jiffies 4294948651
hex dump (first 32 bytes on cpu 0):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):

pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1896

init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object 0xffff88810b1d9200 (size 512):
comm "syz.0.18", pid 6587, jiffies 4294948653

hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace (crc 27fa06af):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4575 [inline]
slab_alloc_node mm/slub.c:4899 [inline]
__kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5415
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]

init_srcu_struct_fields+0x2c0/0x350 kernel/rcu/srcutree.c:207
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object (percpu) 0x607e4d9447c0 (size 384):
comm "syz.0.18", pid 6587, jiffies 4294948653
hex dump (first 32 bytes on cpu 0):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):

pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1896

init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak

unreferenced object (percpu) 0x607e4d944980 (size 384):
comm "syz.0.19", pid 6595, jiffies 4294948657
hex dump (first 32 bytes on cpu 0):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 593bdea7):

pcpu_alloc_noprof+0x7c7/0xed0 mm/percpu.c:1896

init_srcu_struct_fields+0x2eb/0x350 kernel/rcu/srcutree.c:224
hci_alloc_dev_priv+0x37/0x680 net/bluetooth/hci_core.c:2416
hci_alloc_dev include/net/bluetooth/hci_core.h:1763 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:672 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:752 [inline]
hci_uart_tty_ioctl+0x173/0x460 drivers/bluetooth/hci_ldisc.c:806
tty_ioctl+0xaca/0xd60 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xee/0x600 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: 174914ea Merge tag 'v7.1-rc6-smb3-client-fixes' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17f2f57e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=5733044df9370cfc

dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=17b2f57e580000

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:

BUG: unable to handle kernel NULL pointer dereference in hci_release_dev

BUG: kernel NULL pointer dereference, address: 00000000000000b0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000011280f067 P4D 800000011280f067 PUD 0
Oops: Oops: 0000 [#1] SMP PTI
CPU: 1 UID: 0 PID: 6587 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:7632 [inline]
RIP: 0010:destroy_workqueue+0x1a/0x430 kernel/workqueue.c:6045
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 49 89 fd 41 54 55 53 48 83 ec 08 e8 66 d6 15 00 <49> 8b 9d b0 00 00 00 48 85 db 74 19 e8 55 d6 15 00 48 8d 7b 08 49
RSP: 0018:ffffc90002177c68 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88811cb86000 RCX: ffffffff81a2820c
RDX: ffff88810aac91c0 RSI: ffffffff816e808a RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: ffffffff85600000 R11: 0000000000000001 R12: ffff88811cb87390
R13: 0000000000000000 R14: ffff88811cb86030 R15: 0000000000000000
FS: 000055556c326500(0000) GS:ffff8881b23e5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b0 CR3: 0000000129ede000 CR4: 00000000003526f0
Call Trace:
<TASK>
hci_release_dev+0x62/0x250 net/bluetooth/hci_core.c:2712
bt_host_release+0x19/0x30 net/bluetooth/hci_sysfs.c:86
device_release+0x4d/0xd0 drivers/base/core.c:2566
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0xe4/0x1d0 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3814
hci_uart_tty_close+0x155/0x1a0 drivers/bluetooth/hci_ldisc.c:587
tty_ldisc_close+0x51/0x70 drivers/tty/tty_ldisc.c:455
tty_ldisc_kill drivers/tty/tty_ldisc.c:613 [inline]
tty_ldisc_release+0xd5/0x2d0 drivers/tty/tty_ldisc.c:781
tty_release_struct+0x1a/0x90 drivers/tty/tty_io.c:1681
tty_release+0x6b0/0x6c0 drivers/tty/tty_io.c:1852
__fput+0x1b5/0x500 fs/file_table.c:510
task_work_run+0x95/0xf0 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xd9/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x485/0x600 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe03af9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeee0ab038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffeee0ab120 RCX: 00007fe03af9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001bd43 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b31220000 R11: 0000000000000246 R12: 00007ffeee0ab160
R13: 00007fe03b215fac R14: 000000000001bd76 R15: 00007fe03b215fa0
</TASK>
Modules linked in:
CR2: 00000000000000b0
---[ end trace 0000000000000000 ]---
RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:7632 [inline]
RIP: 0010:destroy_workqueue+0x1a/0x430 kernel/workqueue.c:6045
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 49 89 fd 41 54 55 53 48 83 ec 08 e8 66 d6 15 00 <49> 8b 9d b0 00 00 00 48 85 db 74 19 e8 55 d6 15 00 48 8d 7b 08 49
RSP: 0018:ffffc90002177c68 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88811cb86000 RCX: ffffffff81a2820c
RDX: ffff88810aac91c0 RSI: ffffffff816e808a RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: ffffffff85600000 R11: 0000000000000001 R12: ffff88811cb87390
R13: 0000000000000000 R14: ffff88811cb86030 R15: 0000000000000000
FS: 000055556c326500(0000) GS:ffff8881b23e5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b0 CR3: 0000000129ede000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: f3 0f 1e fa endbr64
14: 41 57 push %r15
16: 41 56 push %r14
18: 41 55 push %r13
1a: 49 89 fd mov %rdi,%r13
1d: 41 54 push %r12
1f: 55 push %rbp
20: 53 push %rbx
21: 48 83 ec 08 sub $0x8,%rsp
25: e8 66 d6 15 00 call 0x15d690
* 2a: 49 8b 9d b0 00 00 00 mov 0xb0(%r13),%rbx <-- trapping instruction
31: 48 85 db test %rbx,%rbx
34: 74 19 je 0x4f
36: e8 55 d6 15 00 call 0x15d690
3b: 48 8d 7b 08 lea 0x8(%rbx),%rdi
3f: 49 rex.WB

Tested on:

commit: 174914ea Merge tag 'v7.1-rc6-smb3-client-fixes' of git..
git tree: upstream

console output: https://syzkaller.appspot.com/x/log.txt?x=17cb69a6580000

kernel config: https://syzkaller.appspot.com/x/.config?x=5733044df9370cfc
dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=114b7ed2580000

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: unable to handle kernel NULL pointer dereference in hci_release_dev

BUG: kernel NULL pointer dereference, address: 00000000000000b0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page

PGD 800000012a7b5067 P4D 800000012a7b5067 PUD 0

Oops: Oops: 0000 [#1] SMP PTI

CPU: 1 UID: 0 PID: 6583 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026

RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:7607 [inline]
RIP: 0010:destroy_workqueue+0x1a/0x430 kernel/workqueue.c:6020
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 49 89 fd 41 54 55 53 48 83 ec 08 e8 06 d2 15 00 <49> 8b 9d b0 00 00 00 48 85 db 74 19 e8 f5 d1 15 00 48 8d 7b 08 49
RSP: 0018:ffffc90002aafc78 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8881141e0000 RCX: ffffffff81a266cc
RDX: ffff88810a6311c0 RSI: ffffffff816e6f0a RDI: 0000000000000000

RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000

R10: ffffffff85600000 R11: 0000000000000001 R12: ffff8881141e1390
R13: 0000000000000000 R14: ffff8881141e0030 R15: 0000000000000000
FS: 000055559230a500(0000) GS:ffff8881b23ec000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000000000b0 CR3: 000000012983e000 CR4: 00000000003526f0
Call Trace:
<TASK>
hci_release_dev+0x62/0x250 net/bluetooth/hci_core.c:2749

bt_host_release+0x19/0x30 net/bluetooth/hci_sysfs.c:86
device_release+0x4d/0xd0 drivers/base/core.c:2566
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0xe4/0x1d0 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3814

hci_uart_tty_close+0xf7/0x120 drivers/bluetooth/hci_ldisc.c:558

tty_ldisc_close+0x51/0x70 drivers/tty/tty_ldisc.c:455
tty_ldisc_kill drivers/tty/tty_ldisc.c:613 [inline]
tty_ldisc_release+0xd5/0x2d0 drivers/tty/tty_ldisc.c:781
tty_release_struct+0x1a/0x90 drivers/tty/tty_io.c:1681
tty_release+0x6b0/0x6c0 drivers/tty/tty_io.c:1852
__fput+0x1b5/0x500 fs/file_table.c:510
task_work_run+0x95/0xf0 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]

exit_to_user_mode_loop+0xcf/0x440 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x485/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f57d6b9cdd9

Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007fff37ccc228 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff37ccc310 RCX: 00007f57d6b9cdd9

RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003

RBP: 000000000001baba R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b31820000 R11: 0000000000000246 R12: 00007fff37ccc350
R13: 00007f57d6e15fac R14: 000000000001baed R15: 00007f57d6e15fa0

</TASK>
Modules linked in:
CR2: 00000000000000b0
---[ end trace 0000000000000000 ]---

RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:7607 [inline]
RIP: 0010:destroy_workqueue+0x1a/0x430 kernel/workqueue.c:6020
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 49 89 fd 41 54 55 53 48 83 ec 08 e8 06 d2 15 00 <49> 8b 9d b0 00 00 00 48 85 db 74 19 e8 f5 d1 15 00 48 8d 7b 08 49
RSP: 0018:ffffc90002aafc78 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8881141e0000 RCX: ffffffff81a266cc
RDX: ffff88810a6311c0 RSI: ffffffff816e6f0a RDI: 0000000000000000

RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000

R10: ffffffff85600000 R11: 0000000000000001 R12: ffff8881141e1390
R13: 0000000000000000 R14: ffff8881141e0030 R15: 0000000000000000
FS: 000055559230a500(0000) GS:ffff8881b23ec000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000000000b0 CR3: 000000012983e000 CR4: 00000000003526f0

25: e8 06 d2 15 00 call 0x15d230

* 2a: 49 8b 9d b0 00 00 00 mov 0xb0(%r13),%rbx <-- trapping instruction
31: 48 85 db test %rbx,%rbx
34: 74 19 je 0x4f

36: e8 f5 d1 15 00 call 0x15d230

3b: 48 8d 7b 08 lea 0x8(%rbx),%rdi
3f: 49 rex.WB


Tested on:

commit: f377d002 Merge tag 'sh-for-v7.1-tag2' of git://git.ker..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=14789d7e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9645c21cfd1d3e8f

dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=10392ab6580000

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com
Tested-by: syzbot+535ecc...@syzkaller.appspotmail.com

Tested on:

commit: f377d002 Merge tag 'sh-for-v7.1-tag2' of git://git.ker..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

console output: https://syzkaller.appspot.com/x/log.txt?x=125e35ec580000

kernel config: https://syzkaller.appspot.com/x/.config?x=9645c21cfd1d3e8f
dashboard link: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=122676ec580000

Note: testing is done by a robot and is best-effort only.

[Bharath Reddy]

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Syzbot caught a percpu memory leak in the SRCU struct when Bluetooth
HCI UART configuration fails early.

The problem boils down to a bypassed destructor. If device setup fails
before hci_register_dev() completes, the HCI_UNREGISTER flag is never
set. Later, when the device is freed, bt_host_release() sees this flag
is missing, skips hci_release_dev(), and jumps straight to kfree(hdev).
This leaks the SRCU memory, which was also incorrectly being cleaned up
in hci_unregister_dev() which is also skipped during an early abort.

To fix this and properly balance the allocation and teardown paths:

1. Move cleanup_srcu_struct() into hci_release_dev() so it directly
mirrors the allocation in hci_alloc_dev().
2. Unconditionally call hci_release_dev() from bt_host_release() by
dropping the HCI_UNREGISTER check. This is safe for unregistered
devices since it only cleans up resources initialized early on in
hci_alloc_dev().

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com

Signed-off-by: Bharath Reddy <kbredd...@gmail.com>
---
net/bluetooth/hci_core.c | 3 ++-
net/bluetooth/hci_sysfs.c | 6 ++----
2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index c46c1236ebfa..f6bc7cb3e55c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2701,7 +2701,6 @@ void hci_unregister_dev(struct hci_dev *hdev)

write_unlock(&hci_dev_list_lock);

synchronize_srcu(&hdev->srcu);
- cleanup_srcu_struct(&hdev->srcu);

disable_work_sync(&hdev->rx_work);
disable_work_sync(&hdev->cmd_work);

@@ -2774,6 +2773,8 @@ void hci_release_dev(struct hci_dev *hdev)

kfree_skb(hdev->sent_cmd);
kfree_skb(hdev->req_skb);
kfree_skb(hdev->recv_event);
+
+ cleanup_srcu_struct(&hdev->srcu);
kfree(hdev);
}
EXPORT_SYMBOL(hci_release_dev);

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 041ce9adc378..261b28a25b02 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -83,10 +83,8 @@ static void bt_host_release(struct device *dev)
{
struct hci_dev *hdev = to_hci_dev(dev);

- if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
- hci_release_dev(hdev);
- else
- kfree(hdev);
+ hci_release_dev(hdev);
+
module_put(THIS_MODULE);
}

--
2.34.1

[Bharath Reddy]

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f377d0025eb0

Early failures in Bluetooth HCI UART configuration leak SRCU percpu
memory.

When device initialization fails before hci_register_dev() completes,
the HCI_UNREGISTER flag is never set. As a result, when the device
reference count reaches zero, bt_host_release() evaluates this flag as
false and falls back to a direct kfree(hdev).

Because hci_release_dev() is bypassed, the SRCU struct initialized
early in hci_alloc_dev() is never cleaned up, resulting in a leak of
percpu memory.

Fix the leak by explicitly calling cleanup_srcu_struct() in the
fallback (unregistered) branch of bt_host_release() before freeing
the device.

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com

Signed-off-by: Bharath Reddy <kbredd...@gmail.com>
---

net/bluetooth/hci_sysfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 041ce9adc378..74131f2c3be6 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -85,8 +85,10 @@ static void bt_host_release(struct device *dev)

if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
hci_release_dev(hdev);
- else
+ else {
+ cleanup_srcu_struct(&hdev->srcu);
kfree(hdev);
+ }
module_put(THIS_MODULE);
}

--
2.34.1

[Bharath Reddy]

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f377d0025eb0

Syzbot caught a percpu memory leak in the SRCU struct when Bluetooth
HCI UART configuration fails early.

The problem boils down to a bypassed destructor. If device setup fails

before hci_register_dev() completes, the HCI_UNREGISTER flag is never

set. Later, when the device is freed, bt_host_release() sees this flag
is missing, skips hci_release_dev(), and jumps straight to kfree(hdev).
This leaks the SRCU memory, which was also incorrectly being cleaned up
in hci_unregister_dev() which is also skipped during an early abort.

To fix this and properly balance the allocation and teardown paths:

1. Move cleanup_srcu_struct() into hci_release_dev() so it directly
mirrors the allocation in hci_alloc_dev().
2. Unconditionally call hci_release_dev() from bt_host_release() by
dropping the HCI_UNREGISTER check. This is safe for unregistered
devices since it only cleans up resources initialized early on in
hci_alloc_dev().

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com

Signed-off-by: Bharath Reddy <kbredd...@gmail.com>
---

net/bluetooth/hci_core.c | 3 ++-
net/bluetooth/hci_sysfs.c | 6 ++----
2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index c46c1236ebfa..f6bc7cb3e55c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2701,7 +2701,6 @@ void hci_unregister_dev(struct hci_dev *hdev)
write_unlock(&hci_dev_list_lock);

synchronize_srcu(&hdev->srcu);
- cleanup_srcu_struct(&hdev->srcu);

disable_work_sync(&hdev->rx_work);
disable_work_sync(&hdev->cmd_work);
@@ -2774,6 +2773,8 @@ void hci_release_dev(struct hci_dev *hdev)
kfree_skb(hdev->sent_cmd);
kfree_skb(hdev->req_skb);
kfree_skb(hdev->recv_event);
+
+ cleanup_srcu_struct(&hdev->srcu);
kfree(hdev);
}
EXPORT_SYMBOL(hci_release_dev);

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 041ce9adc378..261b28a25b02 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c

[Bharath Reddy]

Early failures in Bluetooth HCI UART configuration leak SRCU percpu
memory.

When device initialization fails before hci_register_dev() completes,
the HCI_UNREGISTER flag is never set. As a result, when the device
reference count reaches zero, bt_host_release() evaluates this flag as
false and falls back to a direct kfree(hdev).

Because hci_release_dev() is bypassed, the SRCU struct initialized
early in hci_alloc_dev() is never cleaned up, resulting in a leak of
percpu memory.

Fix the leak by explicitly calling cleanup_srcu_struct() in the
fallback (unregistered) branch of bt_host_release() before freeing
the device.

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com

Closes: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
Tested-by: syzbot+535ecc...@syzkaller.appspotmail.com
Fixes: 1d6123102e9f ("Bluetooth: hci_core: Fix use-after-free in vhci_flush()")

Signed-off-by: Bharath Reddy <kbredd...@gmail.com>
---

net/bluetooth/hci_sysfs.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 041ce9adc378..8957ce7c21b7 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -83,10 +83,12 @@ static void bt_host_release(struct device *dev)

{
struct hci_dev *hdev = to_hci_dev(dev);

- if (hci_dev_test_flag(hdev, HCI_UNREGISTER))

+ if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) {

[Bharath Reddy]

Early failures in Bluetooth HCI UART configuration leak SRCU percpu
memory.

When device initialization fails before hci_register_dev() completes,
the HCI_UNREGISTER flag is never set. As a result, when the device
reference count reaches zero, bt_host_release() evaluates this flag as
false and falls back to a direct kfree(hdev).

Because hci_release_dev() is bypassed, the SRCU struct initialized
early in hci_alloc_dev() is never cleaned up, resulting in a leak of
percpu memory.

Fix the leak by explicitly calling cleanup_srcu_struct() in the
fallback (unregistered) branch of bt_host_release() before freeing
the device.

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
Tested-by: syzbot+535ecc...@syzkaller.appspotmail.com
Fixes: 1d6123102e9f ("Bluetooth: hci_core: Fix use-after-free in vhci_flush()")
Signed-off-by: Bharath Reddy <kbredd...@gmail.com>
---

Changes in v4:
- Include patch version history.

Changes in v3:
- Added missing curly braces to the if/else block in bt_host_release()
to resolve a checkpatch.pl warning.
- Added Fixes and Closes tags.

Changes in v2:
- Fixed a NULL pointer dereference caused by v1.
- Moved cleanup_srcu_struct() to the fallback (unregistered) branch
of bt_host_release() instead of unconditionally calling hci_release_dev().

Changes in v1:
- Initial patch (failed because it bypassed the HCI_UNREGISTER check).

[Bharath Reddy]

Early failures in Bluetooth HCI UART configuration leak SRCU percpu
memory.

When device initialization fails before hci_register_dev() completes,
the HCI_UNREGISTER flag is never set. As a result, when the device
reference count reaches zero, bt_host_release() evaluates this flag as
false and falls back to a direct kfree(hdev).

Because hci_release_dev() is bypassed, the SRCU struct initialized
early in hci_alloc_dev() is never cleaned up, resulting in a leak of
percpu memory.

Fix the leak by explicitly calling cleanup_srcu_struct() in the
fallback (unregistered) branch of bt_host_release() before freeing
the device.

Reported-by: syzbot+535ecc...@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=535ecc844591e50588a5
Tested-by: syzbot+535ecc...@syzkaller.appspotmail.com
Fixes: 1d6123102e9f ("Bluetooth: hci_core: Fix use-after-free in vhci_flush()")
Signed-off-by: Bharath Reddy <kbredd...@gmail.com>
---

Changes in v5:
- Removed trailing whitespace in the version history to fix GitLint error

Changes in v4:
- Included patch version history

Changes in v3:
- Added missing curly braces to the if/else block in bt_host_release()
to resolve a checkpatch.pl warning

- Added Fixes and Closes tags

Changes in v2:
- Fixed a NULL pointer dereference caused by v1

- Moved cleanup_srcu_struct() to the fallback (unregistered) branch
of bt_host_release() instead of unconditionally calling hci_release_dev()

Changes in v1:
- Initial patch (failed because it bypassed the HCI_UNREGISTER check)

[patchwork-b...@kernel.org]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.vo...@intel.com>:

On Mon, 1 Jun 2026 08:54:26 +0530 you wrote:
> Early failures in Bluetooth HCI UART configuration leak SRCU percpu
> memory.
>
> When device initialization fails before hci_register_dev() completes,
> the HCI_UNREGISTER flag is never set. As a result, when the device
> reference count reaches zero, bt_host_release() evaluates this flag as
> false and falls back to a direct kfree(hdev).
>

> [...]

Here is the summary with links:
- [v5] Bluetooth: fix memory leak in error path of hci_alloc_dev()
https://git.kernel.org/bluetooth/bluetooth-next/c/cf767a2d88f7

You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html