Hello, The following program causes a WARNING in idr_remove: ------------[ cut here ]------------ WARNING: CPU: 3 PID: 26766 at lib/idr.c:505 idr_remove called for id=1 which is not allocated. CPU: 3 PID: 26766 Comm: syz-executor Not tainted 4.8.0-rc3+ #33 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffffffff884b8280 ffff8800634878d8 ffffffff82d1b239 ffffffff01fc0000 fffffbfff1097050 ffffffff86e8eec0 ffff8800634879b0 ffffffff8723b400 dffffc0000000000 0000000000000009 ffff8800634879a0 ffffffff816ab4e3 Call Trace: [<ffffffff813809bc>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:532 [< inline >] idr_remove_warning lib/idr.c:505 [<ffffffff82d1e5c7>] idr_remove+0x617/0x830 lib/idr.c:559 [<ffffffff8340761d>] drm_legacy_ctxbitmap_free+0x9d/0xd0 drivers/gpu/drm/drm_context.c:61 [<ffffffff834090ae>] drm_legacy_rmctx+0x30e/0x410 drivers/gpu/drm/drm_context.c:496 [<ffffffff83410a5c>] drm_ioctl+0x7bc/0xc60 drivers/gpu/drm/drm_ioctl.c:724 [< inline >] vfs_ioctl fs/ioctl.c:43 [<ffffffff8186f1fc>] do_vfs_ioctl+0x18c/0x1080 fs/ioctl.c:675 [< inline >] SYSC_ioctl fs/ioctl.c:690 [<ffffffff8187017f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:681 [<ffffffff810088ff>] do_syscall_64+0x1df/0x640 arch/x86/entry/common.c:288 [<ffffffff86c25543>] entry_SYSCALL64_slow_path+0x25/0x25 arch/x86/entry/entry_64.S:248 // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <stdint.h> #include <stdio.h> #include <sys/syscall.h> #include <unistd.h> int main() { syscall(__NR_mmap, 0x20000000ul, 0xc000ul, 0x3ul, 0x32ul, -1, 0x0ul, 0, 0, 0); int fd = open("/dev/dri/card0", 0x101102ul, 0); *(uint32_t*)0x2000b000 = (uint32_t)0x2; *(uint64_t*)0x2000b008 = (uint64_t)0x2000b000; syscall(__NR_ioctl, fd, 0xc0106426ul, 0x2000b000ul); int res = *(uint32_t*)0x2000b000; *(uint32_t*)0x2000bff8 = res; *(uint32_t*)0x2000bffc = (uint32_t)0x2; syscall(__NR_ioctl, fd, 0xc0086421ul, 0x2000bff8ul); return 0; } On commit 61c04572de404e52a655a36752e696bbcb483cf5 (Aug 25). _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
