syzbot


WARNING in drm_modeset_lock_all

Status: fixed on 2018/02/13 04:59
Subsystems: dri
[Documentation on labels]
Reported-by: syzbot+8de19a03d6fdf256eb2b90ec48916b6f47b9b5a3@syzkaller.appspotmail.com
Fix commit: d18d1a5ac811 drm: Require __GFP_NOFAIL for the legacy drm_modeset_lock_all
First crash: 2503d, last: 2421d

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 2 PID: 5687 at drivers/gpu/drm/drm_modeset_lock.c:97 drm_modeset_lock_all+0x1fa/0x2d0 drivers/gpu/drm/drm_modeset_lock.c:97
Kernel panic - not syncing: panic_on_warn set ...

CPU: 2 PID: 5687 Comm: syz-executor0 Not tainted 4.14.0-rc7-next-20171102+ #9
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:drm_modeset_lock_all+0x1fa/0x2d0 drivers/gpu/drm/drm_modeset_lock.c:97
RSP: 0018:ffff88002e03f8d8 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffffffff85656640 RCX: ffffffff829de69a
RDX: 000000000000cd6c RSI: ffffc90000ec2000 RDI: 0000000000000286
RBP: ffff88002e03f8f0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88003c2d88c0 R14: ffff88002e03f9e8 R15: ffff88003c2d88c0
 dpms_legacy drivers/gpu/drm/drm_fb_helper.c:615 [inline]
 drm_fb_helper_dpms.isra.13+0x122/0x4c0 drivers/gpu/drm/drm_fb_helper.c:649
 drm_fb_helper_blank+0x16e/0x1c0 drivers/gpu/drm/drm_fb_helper.c:682
 fb_blank+0x148/0x1f0 drivers/video/fbdev/core/fbmem.c:1072
 do_fb_ioctl+0x72c/0xc80 drivers/video/fbdev/core/fbmem.c:1211
 fb_ioctl+0xdd/0x120 drivers/video/fbdev/core/fbmem.c:1235
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x447c89
RSP: 002b:00007f6b038a5bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6b038a66cc RCX: 0000000000447c89
RDX: 0000000020fb5000 RSI: 0000000000004611 RDI: 0000000000000013
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a96f0
R13: 0000000000000000 R14: 00007f6b038a59c8 R15: 00007f6b038a5b38
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (35):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/11/03 03:13 linux-next fa8785e862ef 02b8363d .config console log report skylake-linux-next-kasan-qemu
2017/11/01 08:16 linux-next 36ef71cae353 e511d9f8 .config console log report ci-upstream-next-kasan-gce
2017/10/30 14:59 linux-next 36ef71cae353 e511d9f8 .config console log report ci-upstream-next-kasan-gce
2017/10/27 20:21 linux-next 36ef71cae353 e511d9f8 .config console log report skylake-linux-next-kasan-qemu
2017/10/27 08:26 linux-next 36ef71cae353 e511d9f8 .config console log report skylake-linux-next-kasan-qemu
2017/10/27 08:13 linux-next 36ef71cae353 e511d9f8 .config console log report skylake-linux-next-kasan-qemu
2017/10/26 09:01 linux-next 36ef71cae353 e511d9f8 .config console log report skylake-linux-next-kasan-qemu
2017/10/26 08:23 linux-next 36ef71cae353 e511d9f8 .config console log report skylake-linux-next-kasan-qemu
2017/10/25 07:14 linux-next 36ef71cae353 e511d9f8 .config console log report skylake-linux-next-kasan-qemu
2017/10/25 00:28 linux-next 36ef71cae353 e511d9f8 .config console log report ci-upstream-next-kasan-gce
2017/10/24 14:41 linux-next 36ef71cae353 e511d9f8 .config console log report ci-upstream-next-kasan-gce
2017/09/14 03:57 linux-next 31fc38c47623 96b8e399 .config console log report skylake-linux-next-kasan-qemu
2017/09/13 04:56 linux-next 6f20b7a58cb9 96b8e399 .config console log report skylake-linux-next-kasan-qemu
2017/09/02 20:19 linux-next 1d53d908b79d a54dce00 .config console log report ci-upstream-next-kasan-gce
2017/09/02 13:00 linux-next 1d53d908b79d a54dce00 .config console log report ci-upstream-next-kasan-gce
2017/08/25 09:31 linux-next 7159188b70e3 4074aed7 .config console log report skylake-linux-next-kasan-qemu
2017/08/19 23:52 linux-next bb70832dd42b f238fbd4 .config console log report ci-upstream-next-kasan-gce
2017/08/17 08:26 linux-next bb70832dd42b f238fbd4 .config console log report skylake-linux-next-kasan-qemu
2017/08/13 04:31 linux-next 91dfed74eabc 6a0246bf .config console log report skylake-linux-next-kasan-qemu
2017/08/13 01:58 linux-next 91dfed74eabc 6a0246bf .config console log report skylake-linux-next-kasan-qemu
* Struck through repros no longer work on HEAD.