Hello, syzbot found the following issue on: HEAD commit: 2c9b3512402e Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13550ec3980000 kernel config: https://syzkaller.appspot.com/x/.config?x=be4129de17851dbe dashboard link: https://syzkaller.appspot.com/bug?extid=52115a16e7eac723d587 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2c9b3512.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/105004175f16/vmlinux-2c9b3512.xz kernel image: https://storage.googleapis.com/syzbot-assets/4d8a81aaa129/bzImage-2c9b3512.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+52115a16e7eac723d587@xxxxxxxxxxxxxxxxxxxxxxxxx Bluetooth: hci2: ISO packet for unknown connection handle 0 ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] BUG: KASAN: null-ptr-deref in l2cap_sock_resume_cb+0xd0/0x130 net/bluetooth/l2cap_sock.c:1697 Write of size 8 at addr 0000000000000518 by task kworker/u33:6/5222 CPU: 1 PID: 5222 Comm: kworker/u33:6 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci0 hci_rx_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 kasan_report+0xd9/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_write include/linux/instrumented.h:82 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] l2cap_sock_resume_cb+0xd0/0x130 net/bluetooth/l2cap_sock.c:1697 l2cap_security_cfm+0x78d/0x11d0 net/bluetooth/l2cap_core.c:7354 hci_encrypt_cfm+0x194/0x720 include/net/bluetooth/hci_core.h:2041 hci_encrypt_change_evt+0x554/0x10f0 net/bluetooth/hci_event.c:3649 hci_event_func net/bluetooth/hci_event.c:7445 [inline] hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7497 hci_rx_work+0x2c6/0x1610 net/bluetooth/hci_core.c:4029 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> ================================================================== --- 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 syzkaller@xxxxxxxxxxxxxxxx. 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
