bisecting fixing commit since e0f8b8a65a473a8baa439cf865a694bbeb83fe90
building syzkaller on 4d1ab643be2091f794ec55d83ec8acf7b0a60be3
testing commit e0f8b8a65a473a8baa439cf865a694bbeb83fe90 with gcc (GCC) 8.1.0
kernel signature: a4812e0888dbb2355be1351bf35aefc2fcac3e353cc47751f11828d328bf6122
all runs: crashed: general protection fault in fbcon_cursor
testing current HEAD a41ba30d9df20fe141c92aacbb56b6b077f19716
testing commit a41ba30d9df20fe141c92aacbb56b6b077f19716 with gcc (GCC) 8.1.0
kernel signature: a5ed91463d310a34f09a15e2e95e6d22282dab5a544d001a7a042dc910e27b49
all runs: crashed: general protection fault in fbcon_cursor
revisions tested: 2, total time: 24m37.326379593s (build: 16m15.595992425s, test: 7m15.204805221s)
the crash still happens on HEAD
commit msg: Linux 4.14.181
crash: general protection fault in fbcon_cursor
batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7497 Comm: kworker/0:3 Not tainted 4.14.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
task: ffff88808d860340 task.stack: ffff88808f698000
RIP: 0010:fbcon_cursor+0x10f/0x6b0 drivers/video/fbdev/core/fbcon.c:1328
RSP: 0018:ffff88808f69fb30 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff8880a4b4ac00 RCX: 0000000000000002
RDX: 0000000020000001 RSI: 0000000000000001 RDI: ffff8880a4b4afa0
RBP: ffff88808f69fb70 R08: 0000000000000000 R09: 000000000000001f
R10: ffffed1014bd56bb R11: ffff8880a5eab5df R12: ffff8880a678e200
R13: ffff8880a5ea6000 R14: 000000010000000c R15: ffff8880a678e670
FS:  0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc9edc6cc0 CR3: 00000000a38a1000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_cursor+0x160/0x1b0 drivers/tty/vt/vt.c:603
 redraw_screen+0x516/0x7f0 drivers/tty/vt/vt.c:707
 complete_change_console+0xfd/0x300 drivers/tty/vt/vt_ioctl.c:1284
 change_console+0x141/0x240 drivers/tty/vt/vt_ioctl.c:1409
 console_callback+0x2f4/0x360 drivers/tty/vt/vt.c:2473
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 3c 05 00 00 4c 8b b3 a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 14 02 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 
RIP: fbcon_cursor+0x10f/0x6b0 drivers/video/fbdev/core/fbcon.c:1328 RSP: ffff88808f69fb30
---[ end trace 226607e1bdd2f3e6 ]---