On Wed, Jun 13, 2018 at 9:51 AM, syzbot <syzbot+287843ad8a4d2870e538@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 0adb32858b0b Linux 4.16 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=138f2d0b800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=df0c336cc3b55d45 > dashboard link: https://syzkaller.appspot.com/bug?extid=287843ad8a4d2870e538 > compiler: gcc (GCC) 7.1.1 20170620 > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+287843ad8a4d2870e538@xxxxxxxxxxxxxxxxxxxxxxxxx I think this is: #syz dup: KASAN: use-after-free Read in rds_cong_queue_updates > ================================================================== > BUG: KASAN: out-of-bounds in __read_once_size include/linux/compiler.h:188 > [inline] > BUG: KASAN: out-of-bounds in atomic_read arch/x86/include/asm/atomic.h:27 > [inline] > BUG: KASAN: out-of-bounds in refcount_read include/linux/refcount.h:42 > [inline] > BUG: KASAN: out-of-bounds in check_net include/net/net_namespace.h:228 > [inline] > BUG: KASAN: out-of-bounds in rds_destroy_pending net/rds/rds.h:868 [inline] > BUG: KASAN: out-of-bounds in rds_cong_queue_updates+0x4d3/0x4f0 > net/rds/cong.c:226 > Read of size 4 at addr ffff88018d7f2204 by task kworker/u4:6/10561 > > CPU: 1 PID: 10561 Comm: kworker/u4:6 Not tainted 4.16.0+ #10 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: krdsd rds_send_worker > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x24d lib/dump_stack.c:53 > kernel msg: ebtables bug: please report to author: Wrong len argument > print_address_description+0x73/0x250 mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report+0x23c/0x360 mm/kasan/report.c:412 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 > __read_once_size include/linux/compiler.h:188 [inline] > atomic_read arch/x86/include/asm/atomic.h:27 [inline] > refcount_read include/linux/refcount.h:42 [inline] > check_net include/net/net_namespace.h:228 [inline] > rds_destroy_pending net/rds/rds.h:868 [inline] > rds_cong_queue_updates+0x4d3/0x4f0 net/rds/cong.c:226 > rds_recv_rcvbuf_delta.part.2+0x289/0x320 net/rds/recv.c:118 > rds_recv_rcvbuf_delta net/rds/recv.c:377 [inline] > rds_recv_incoming+0xeb4/0x11d0 net/rds/recv.c:377 > rds_loop_xmit+0x149/0x320 net/rds/loop.c:82 > rds_send_xmit+0xbcd/0x26b0 net/rds/send.c:355 > rds_send_worker+0x115/0x2a0 net/rds/threads.c:199 > process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 > worker_thread+0x223/0x1990 kernel/workqueue.c:2247 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 > > The buggy address belongs to the page: > page:ffffea000635fc80 count:3 mapcount:2 mapping:0000000000000000 index:0x0 > flags: 0x2fffc0000000000() > raw: 02fffc0000000000 0000000000000000 0000000000000000 0000000300000001 > raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff88018d7f2100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88018d7f2180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ^ > ffff88018d7f2280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88018d7f2300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ================================================================== > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 1 PID: 10561 Comm: kworker/u4:6 Tainted: G B 4.16.0+ #10 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: krdsd rds_send_worker > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x24d lib/dump_stack.c:53 > panic+0x1e4/0x41c kernel/panic.c:183 > kasan_end_report+0x50/0x50 mm/kasan/report.c:180 > kasan_report_error mm/kasan/report.c:359 [inline] > kasan_report+0x149/0x360 mm/kasan/report.c:412 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 > __read_once_size include/linux/compiler.h:188 [inline] > atomic_read arch/x86/include/asm/atomic.h:27 [inline] > refcount_read include/linux/refcount.h:42 [inline] > check_net include/net/net_namespace.h:228 [inline] > rds_destroy_pending net/rds/rds.h:868 [inline] > rds_cong_queue_updates+0x4d3/0x4f0 net/rds/cong.c:226 > rds_recv_rcvbuf_delta.part.2+0x289/0x320 net/rds/recv.c:118 > rds_recv_rcvbuf_delta net/rds/recv.c:377 [inline] > rds_recv_incoming+0xeb4/0x11d0 net/rds/recv.c:377 > rds_loop_xmit+0x149/0x320 net/rds/loop.c:82 > rds_send_xmit+0xbcd/0x26b0 net/rds/send.c:355 > rds_send_worker+0x115/0x2a0 net/rds/threads.c:199 > process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 > worker_thread+0x223/0x1990 kernel/workqueue.c:2247 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug 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 bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/00000000000081bd9d056e813e48%40google.com. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
