Hello, syzbot found the following issue on: HEAD commit: 8883957b3c9d Merge tag 'fsnotify_hsm_for_v6.14-rc1' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13862564580000 kernel config: https://syzkaller.appspot.com/x/.config?x=77593a73383cac88 dashboard link: https://syzkaller.appspot.com/bug?extid=fe280ff30bb95df1577c compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-8883957b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/df6d282e0e7d/vmlinux-8883957b.xz kernel image: https://storage.googleapis.com/syzbot-assets/9a6f61832d52/bzImage-8883957b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fe280ff30bb95df1577c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== 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:1699 Write of size 8 at addr 0000000000000568 by task kworker/u33:4/5957 CPU: 3 UID: 0 PID: 5957 Comm: kworker/u33:4 Not tainted 6.13.0-syzkaller-05154-g8883957b3c9d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci3 hci_rx_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 kasan_report+0xd9/0x110 mm/kasan/report.c:602 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:1699 l2cap_security_cfm+0x795/0x11d0 net/bluetooth/l2cap_core.c:7346 hci_security_cfm include/net/bluetooth/hci_core.h:2088 [inline] hci_encrypt_cfm+0x1f2/0x7d0 include/net/bluetooth/hci_core.h:2136 hci_encrypt_change_evt+0x3f3/0x1130 net/bluetooth/hci_event.c:3655 hci_event_func net/bluetooth/hci_event.c:7473 [inline] hci_event_packet+0x9eb/0x1190 net/bluetooth/hci_event.c:7525 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015 process_one_work+0x958/0x1b30 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 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
