Hello, syzbot found the following issue on: HEAD commit: fe15c26ee26e Linux 6.3-rc1 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=111b3ca4c80000 kernel config: https://syzkaller.appspot.com/x/.config?x=7573cbcd881a88c9 dashboard link: https://syzkaller.appspot.com/bug?extid=e8a22d28d4527d9d6148 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160ec3dcc80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=103d9d42c80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/89d41abd07bd/disk-fe15c26e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fa75f5030ade/vmlinux-fe15c26e.xz kernel image: https://storage.googleapis.com/syzbot-assets/590d0f5903ee/Image-fe15c26e.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e8a22d28d4527d9d6148@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 9 at lib/refcount.c:25 refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 Modules linked in: CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.3.0-rc1-syzkaller-gfe15c26ee26e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: qrtr_ns_handler qrtr_ns_worker pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 lr : refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 sp : ffff80001a3a6da0 x29: ffff80001a3a6da0 x28: dfff800000000000 x27: ffff700003474dc8 x26: ffff80001a3a6e60 x25: 0000000000000000 x24: 00000000003a6056 x23: ffff0000d22173f0 x22: 0000000000000000 x21: 0000000000000002 x20: ffff0000d751c098 x19: ffff8000186ee000 x18: ffff80001a3a62a0 x17: 0000000000000000 x16: ffff80001246250c x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: ff808000081bd230 x10: 0000000000000000 x9 : 04bb8433d1680a00 x8 : 04bb8433d1680a00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001a3a6698 x4 : ffff800015dc52c0 x3 : ffff80000859c514 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] kref_get include/linux/kref.h:45 [inline] qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline] qrtr_node_lookup+0xdc/0x100 net/qrtr/af_qrtr.c:398 qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline] qrtr_recvmsg+0x3dc/0x954 net/qrtr/af_qrtr.c:1070 sock_recvmsg_nosec net/socket.c:1015 [inline] sock_recvmsg net/socket.c:1036 [inline] kernel_recvmsg+0x124/0x18c net/socket.c:1061 qrtr_ns_worker+0x294/0x513c net/qrtr/ns.c:688 process_one_work+0x868/0x16f4 kernel/workqueue.c:2390 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2537 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 irq event stamp: 766220 hardirqs last enabled at (766219): [<ffff800012543b48>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (766219): [<ffff800012543b48>] _raw_spin_unlock_irqrestore+0x44/0xa4 kernel/locking/spinlock.c:194 hardirqs last disabled at (766220): [<ffff80001254393c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (766220): [<ffff80001254393c>] _raw_spin_lock_irqsave+0x2c/0x88 kernel/locking/spinlock.c:162 softirqs last enabled at (766216): [<ffff80001066ca80>] spin_unlock_bh include/linux/spinlock.h:395 [inline] softirqs last enabled at (766216): [<ffff80001066ca80>] lock_sock_nested+0xe8/0x138 net/core/sock.c:3480 softirqs last disabled at (766214): [<ffff80001066ca28>] spin_lock_bh include/linux/spinlock.h:355 [inline] softirqs last disabled at (766214): [<ffff80001066ca28>] lock_sock_nested+0x90/0x138 net/core/sock.c:3476 ---[ end trace 0000000000000000 ]--- --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
