On Sun, Mar 14, 2021 at 11:14 AM syzbot <[email protected]> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 0d7588ab riscv: process: Fix no prototype for arch_dup_tas.. > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git > fixes > console output: https://syzkaller.appspot.com/x/log.txt?x=15a35756d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=81c0b708b31626cc > dashboard link: https://syzkaller.appspot.com/bug?extid=005654dd9b8f26bd4c07 > userspace arch: riscv64 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: [email protected] > > ================================================================== > BUG: KASAN: slab-out-of-bounds in riscv_intc_irq+0x24/0xcc > drivers/irqchip/irq-riscv-intc.c:24 > Read of size 8 at addr ffffffe00c963bd0 by task kworker/1:1/4388 > > CPU: 1 PID: 4388 Comm: kworker/1:1 Not tainted > 5.12.0-rc2-syzkaller-00467-g0d7588ab9ef9 #0 > Hardware name: riscv-virtio,qemu (DT) > Workqueue: events nsim_dev_trap_report_work > Call Trace: > [<ffffffe0000096c0>] walk_stackframe+0x0/0x23c arch/riscv/kernel/traps.c:201 > > Allocated by task 76347056: > (stack is not available) > > Last potentially related work creation:
There seems to be some issue with riscv stack unwinder. This does not have stacks. "BUG: unable to handle kernel access to user memory in schedule_tail" does not have proper stacks: https://syzkaller.appspot.com/bug?id=9de8c24d24004fd5e482555f5ad8314da2fb1cee I also found 2 riscv reports in "KASAN: use-after-free Read in idr_for_each (2)": https://syzkaller.appspot.com/bug?id=7f84dfc3902878befc22e52eb5c7298d0ad70cf3 both don't have any stacks: ================================================================== BUG: KASAN: use-after-free in radix_tree_next_slot include/linux/radix-tree.h:422 [inline] BUG: KASAN: use-after-free in idr_for_each+0xf4/0x160 lib/idr.c:202 Read of size 8 at addr ffffffe010c00878 by task syz-executor.1/4828 CPU: 0 PID: 4828 Comm: syz-executor.1 Not tainted 5.12.0-rc2-syzkaller-00467-g0d7588ab9ef9 #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [<ffffffe0000096c0>] walk_stackframe+0x0/0x23c arch/riscv/kernel/traps.c:201 Allocated by task 4828: (stack is not available) Freed by task 4473: (stack is not available) > --- > 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 [email protected]. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
