[syzbot] [bluetooth?] KMSAN: uninit-value in hci_cmd_complete_evt
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syzbot
Nov 16, 2024, 8:13:26 AM11/16/24
to johan....@gmail.com, linux-b...@vger.kernel.org, linux-...@vger.kernel.org, luiz....@gmail.com, mar...@holtmann.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2d5404caa8c7 Linux 6.12-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1357fe30580000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcca673786a14715
dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a2910755fac8/disk-2d5404ca.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a135257837ee/vmlinux-2d5404ca.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3f8930906164/bzImage-2d5404ca.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a9a4be...@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4221
hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4221
hci_event_func net/bluetooth/hci_event.c:7440 [inline]
hci_event_packet+0x11df/0x1c20 net/bluetooth/hci_event.c:7495
hci_rx_work+0x9d1/0x11f0 net/bluetooth/hci_core.c:4031
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was stored to memory at:
hci_cmd_complete_evt+0xaf4/0xeb0
hci_event_func net/bluetooth/hci_event.c:7440 [inline]
hci_event_packet+0x11df/0x1c20 net/bluetooth/hci_event.c:7495
hci_rx_work+0x9d1/0x11f0 net/bluetooth/hci_core.c:4031
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4091 [inline]
slab_alloc_node mm/slub.c:4134 [inline]
kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
__alloc_skb+0x363/0x7b0 net/core/skbuff.c:678
alloc_skb include/linux/skbuff.h:1322 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:494 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:487 [inline]
vhci_write+0x127/0x900 drivers/bluetooth/hci_vhci.c:607
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xb2b/0x1540 fs/read_write.c:683
ksys_write+0x24f/0x4c0 fs/read_write.c:736
__do_sys_write fs/read_write.c:748 [inline]
__se_sys_write fs/read_write.c:745 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:745
x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 5791 Comm: kworker/u9:2 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: hci1 hci_rx_work
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 2d5404caa8c7 Linux 6.12-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1357fe30580000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcca673786a14715
dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a2910755fac8/disk-2d5404ca.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a135257837ee/vmlinux-2d5404ca.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3f8930906164/bzImage-2d5404ca.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a9a4be...@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4221
hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4221
hci_event_func net/bluetooth/hci_event.c:7440 [inline]
hci_event_packet+0x11df/0x1c20 net/bluetooth/hci_event.c:7495
hci_rx_work+0x9d1/0x11f0 net/bluetooth/hci_core.c:4031
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was stored to memory at:
hci_cmd_complete_evt+0xaf4/0xeb0
hci_event_func net/bluetooth/hci_event.c:7440 [inline]
hci_event_packet+0x11df/0x1c20 net/bluetooth/hci_event.c:7495
hci_rx_work+0x9d1/0x11f0 net/bluetooth/hci_core.c:4031
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4091 [inline]
slab_alloc_node mm/slub.c:4134 [inline]
kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
__alloc_skb+0x363/0x7b0 net/core/skbuff.c:678
alloc_skb include/linux/skbuff.h:1322 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:494 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:487 [inline]
vhci_write+0x127/0x900 drivers/bluetooth/hci_vhci.c:607
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xb2b/0x1540 fs/read_write.c:683
ksys_write+0x24f/0x4c0 fs/read_write.c:736
__do_sys_write fs/read_write.c:748 [inline]
__se_sys_write fs/read_write.c:745 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:745
x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 5791 Comm: kworker/u9:2 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: hci1 hci_rx_work
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Feb 24, 2025, 2:19:25 AMFeb 24
to johan....@gmail.com, linux-b...@vger.kernel.org, linux-...@vger.kernel.org, luiz....@gmail.com, mar...@holtmann.org, syzkall...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: d082ecbc71e9 Linux 6.14-rc4
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13492db0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d66f6f82ee090382
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10023fdf980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a9f22e75faf0/disk-d082ecbc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/336a72a11410/vmlinux-d082ecbc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7180e4935c41/bzImage-d082ecbc.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a9a4be...@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4226
hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4226
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x11c8/0x1ca0 net/bluetooth/hci_event.c:7525
hci_rx_work+0x699/0x1260 net/bluetooth/hci_core.c:4015
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
kthread+0x6b9/0xef0 kernel/kthread.c:464
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
hci_event_packet+0x11c8/0x1ca0 net/bluetooth/hci_event.c:7525
hci_rx_work+0x699/0x1260 net/bluetooth/hci_core.c:4015
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
kthread+0x6b9/0xef0 kernel/kthread.c:464
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
slab_alloc_node mm/slub.c:4164 [inline]
kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:515
__alloc_skb+0x363/0x7b0 net/core/skbuff.c:606
alloc_skb include/linux/skbuff.h:1331 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:495 [inline]
vfs_write+0xb34/0x1540 fs/read_write.c:679
ksys_write+0x240/0x4b0 fs/read_write.c:731
__do_sys_write fs/read_write.c:742 [inline]
__se_sys_write fs/read_write.c:739 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:739
x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci0 hci_rx_work
=====================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: d082ecbc71e9 Linux 6.14-rc4
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13492db0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d66f6f82ee090382
dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122c37f8580000
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10023fdf980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a9f22e75faf0/disk-d082ecbc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/336a72a11410/vmlinux-d082ecbc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7180e4935c41/bzImage-d082ecbc.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a9a4be...@syzkaller.appspotmail.com
=====================================================
hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4226
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x11c8/0x1ca0 net/bluetooth/hci_event.c:7525
hci_rx_work+0x699/0x1260 net/bluetooth/hci_core.c:4015
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
kthread+0x6b9/0xef0 kernel/kthread.c:464
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was stored to memory at:
hci_cmd_complete_evt+0xaf4/0xeb0
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
Uninit was stored to memory at:
hci_cmd_complete_evt+0xaf4/0xeb0
hci_event_packet+0x11c8/0x1ca0 net/bluetooth/hci_event.c:7525
hci_rx_work+0x699/0x1260 net/bluetooth/hci_core.c:4015
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
kthread+0x6b9/0xef0 kernel/kthread.c:464
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4121 [inline]
Uninit was created at:
slab_alloc_node mm/slub.c:4164 [inline]
kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:515
__alloc_skb+0x363/0x7b0 net/core/skbuff.c:606
alloc_skb include/linux/skbuff.h:1331 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:495 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:487 [inline]
vhci_write+0x127/0x900 drivers/bluetooth/hci_vhci.c:607
new_sync_write fs/read_write.c:586 [inline]
vhci_write+0x127/0x900 drivers/bluetooth/hci_vhci.c:607
vfs_write+0xb34/0x1540 fs/read_write.c:679
ksys_write+0x240/0x4b0 fs/read_write.c:731
__do_sys_write fs/read_write.c:742 [inline]
__se_sys_write fs/read_write.c:739 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:739
x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 5777 Comm: kworker/u9:2 Not tainted 6.14.0-rc4-syzkaller #0
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci0 hci_rx_work
=====================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
Ivan Pravdin
Jul 21, 2025, 10:15:25 PMJul 21
to syzbot+a9a4be...@syzkaller.appspotmail.com, syzkall...@googlegroups.com
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
Ivan Pravdin
Ivan Pravdin
syzbot
Jul 22, 2025, 2:03:06 AMJul 22
to ipravdin...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in hci_cmd_complete_evt
=====================================================
BUG: KMSAN: uninit-value in hci_cmd_complete_evt+0xca3/0xe90 net/bluetooth/hci_event.c:4210
hci_cmd_complete_evt+0xca3/0xe90 net/bluetooth/hci_event.c:4210
hci_event_func net/bluetooth/hci_event.c:7515 [inline]
hci_event_packet+0xce2/0x1e40 net/bluetooth/hci_event.c:7572
hci_rx_work+0x9a8/0x12b0 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
kthread+0xd59/0xf00 kernel/kthread.c:464
ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Uninit was stored to memory at:
hci_cmd_complete_evt+0xc9c/0xe90 net/bluetooth/hci_event.c:4210
hci_event_func net/bluetooth/hci_event.c:7515 [inline]
hci_event_packet+0xce2/0x1e40 net/bluetooth/hci_event.c:7572
hci_rx_work+0x9a8/0x12b0 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
kthread+0xd59/0xf00 kernel/kthread.c:464
ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Uninit was stored to memory at:
hci_cmd_complete_evt+0x775/0xe90 net/bluetooth/hci_event.c:-1
hci_event_func net/bluetooth/hci_event.c:7515 [inline]
hci_event_packet+0xce2/0x1e40 net/bluetooth/hci_event.c:7572
hci_rx_work+0x9a8/0x12b0 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
kthread+0xd59/0xf00 kernel/kthread.c:464
ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4153 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4248
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:578
__alloc_skb+0x347/0x7d0 net/core/skbuff.c:669
alloc_skb include/linux/skbuff.h:1337 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:509 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:488 [inline]
vhci_write+0x125/0x960 drivers/bluetooth/hci_vhci.c:608
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0xb34/0x1560 fs/read_write.c:684
ksys_write fs/read_write.c:736 [inline]
__do_sys_write fs/read_write.c:747 [inline]
__se_sys_write fs/read_write.c:744 [inline]
__x64_sys_write+0x1fb/0x4d0 fs/read_write.c:744
x64_sys_call+0x38c3/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x1c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 53 Comm: kworker/u9:0 Not tainted 6.15.0-rc6-syzkaller-01366-g0ba714749722 #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci0 hci_rx_work
=====================================================
Tested on:
commit: 0ba71474 Bluetooth: hci_event: Mask data status from L..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=13122f22580000
kernel config: https://syzkaller.appspot.com/x/.config?x=38456bfd5c806d6d
dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Note: no patches were applied.
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in hci_cmd_complete_evt
=====================================================
BUG: KMSAN: uninit-value in hci_cmd_complete_evt+0xca3/0xe90 net/bluetooth/hci_event.c:4210
hci_cmd_complete_evt+0xca3/0xe90 net/bluetooth/hci_event.c:4210
hci_event_func net/bluetooth/hci_event.c:7515 [inline]
hci_event_packet+0xce2/0x1e40 net/bluetooth/hci_event.c:7572
hci_rx_work+0x9a8/0x12b0 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
kthread+0xd59/0xf00 kernel/kthread.c:464
ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Uninit was stored to memory at:
hci_event_func net/bluetooth/hci_event.c:7515 [inline]
hci_event_packet+0xce2/0x1e40 net/bluetooth/hci_event.c:7572
hci_rx_work+0x9a8/0x12b0 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
kthread+0xd59/0xf00 kernel/kthread.c:464
ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Uninit was stored to memory at:
hci_event_func net/bluetooth/hci_event.c:7515 [inline]
hci_event_packet+0xce2/0x1e40 net/bluetooth/hci_event.c:7572
hci_rx_work+0x9a8/0x12b0 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
kthread+0xd59/0xf00 kernel/kthread.c:464
ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4153 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4248
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:578
__alloc_skb+0x347/0x7d0 net/core/skbuff.c:669
alloc_skb include/linux/skbuff.h:1337 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:509 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:488 [inline]
vhci_write+0x125/0x960 drivers/bluetooth/hci_vhci.c:608
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0xb34/0x1560 fs/read_write.c:684
ksys_write fs/read_write.c:736 [inline]
__do_sys_write fs/read_write.c:747 [inline]
__se_sys_write fs/read_write.c:744 [inline]
__x64_sys_write+0x1fb/0x4d0 fs/read_write.c:744
x64_sys_call+0x38c3/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x1c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 53 Comm: kworker/u9:0 Not tainted 6.15.0-rc6-syzkaller-01366-g0ba714749722 #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci0 hci_rx_work
=====================================================
Tested on:
commit: 0ba71474 Bluetooth: hci_event: Mask data status from L..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=13122f22580000
kernel config: https://syzkaller.appspot.com/x/.config?x=38456bfd5c806d6d
dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Note: no patches were applied.
syzbot
Oct 2, 2025, 1:04:34 PM (yesterday) Oct 2
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
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***
Subject: KMSAN: uninit-value in hci_cmd_complete_evt
Author: chelsyrat...@gmail.com
#syz test
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: KMSAN: uninit-value in hci_cmd_complete_evt
Author: chelsyrat...@gmail.com
#syz test
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