+Hridya Valsaraju On Fri, Apr 3, 2020 at 5:35 AM syzbot <syzbot+71f39766a98dddab97b5@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 245a4300 Merge branch 'rcu/kcsan' into tip/locking/kcsan > git tree: https://github.com/google/ktsan.git kcsan > console output: https://syzkaller.appspot.com/x/log.txt?x=106b67f1e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a4b9db179318d21f > dashboard link: https://syzkaller.appspot.com/bug?extid=71f39766a98dddab97b5 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > 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+71f39766a98dddab97b5@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KCSAN: data-race in binder_dec_node_nilocked / binder_state_show > > write to 0xffff88809f276954 of 4 bytes by task 1408 on cpu 0: > binder_state_show+0xd8/0x260 drivers/android/binder.c:5938 > seq_read+0x350/0x9d0 fs/seq_file.c:229 > full_proxy_read+0xbd/0x100 fs/debugfs/file.c:220 > do_loop_readv_writev fs/read_write.c:714 [inline] > do_loop_readv_writev fs/read_write.c:701 [inline] > do_iter_read+0x357/0x3d0 fs/read_write.c:935 > vfs_readv+0x9c/0xf0 fs/read_write.c:997 > do_preadv+0x131/0x1d0 fs/read_write.c:1089 > __do_sys_preadv fs/read_write.c:1139 [inline] > __se_sys_preadv fs/read_write.c:1134 [inline] > __x64_sys_preadv+0x61/0x80 fs/read_write.c:1134 > do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > read to 0xffff88809f276954 of 4 bytes by task 1416 on cpu 1: > binder_dec_node_nilocked+0x382/0x610 drivers/android/binder.c:1261 > binder_dec_node_tmpref+0xa3/0x120 drivers/android/binder.c:1379 > binder_put_node drivers/android/binder.c:1387 [inline] > binder_state_show+0x1aa/0x260 drivers/android/binder.c:5950 > seq_read+0x350/0x9d0 fs/seq_file.c:229 > full_proxy_read+0xbd/0x100 fs/debugfs/file.c:220 > do_loop_readv_writev fs/read_write.c:714 [inline] > do_loop_readv_writev fs/read_write.c:701 [inline] > do_iter_read+0x357/0x3d0 fs/read_write.c:935 > vfs_readv+0x9c/0xf0 fs/read_write.c:997 > do_preadv+0x131/0x1d0 fs/read_write.c:1089 > __do_sys_preadv fs/read_write.c:1139 [inline] > __se_sys_preadv fs/read_write.c:1134 [inline] > __x64_sys_preadv+0x61/0x80 fs/read_write.c:1134 > do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > Reported by Kernel Concurrency Sanitizer on: > CPU: 1 PID: 1416 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > ================================================================== > > > --- > 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#status for how to communicate with syzbot. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
