bisecting fixing commit since 359c92c02bfae1a6f1e8e37c298e518fd256642c
building syzkaller on a75b198cd071926905c294db80393240f55a9a0f
testing commit 359c92c02bfae1a6f1e8e37c298e518fd256642c with gcc (GCC) 8.1.0
kernel signature: 037388e41c352396487bebf95269e06baae43125ee298f0f70d2b994dc9c3c7a
all runs: crashed: general protection fault in fbcon_cursor
testing current HEAD ae83d0b416db002fe95601e7f97f64b59514d936
testing commit ae83d0b416db002fe95601e7f97f64b59514d936 with gcc (GCC) 8.1.0
kernel signature: 123adf62433f3d5ac2905db07c9c095ee21a5e7816f9c4ab63054262cb9bf425
all runs: crashed: general protection fault in fbcon_cursor
revisions tested: 2, total time: 19m26.6702889s (build: 12m0.855082706s, test: 6m30.736071807s)
the crash still happens on HEAD
commit msg: Linux 5.7-rc2
crash: general protection fault in fbcon_cursor
general protection fault, probably for non-canonical address 0xdffffc0020000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000100000008-0x000000010000000f]
CPU: 1 PID: 2931 Comm: kworker/1:6 Not tainted 5.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
RIP: 0010:fbcon_cursor+0x10f/0x570 drivers/video/fbdev/core/fbcon.c:1389
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0b 04 00 00 4c 8b ab f0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 d9
RSP: 0018:ffffc90008f17b28 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff88809d60b000 RCX: 0000000000000002
RDX: 0000000020000001 RSI: 0000000000000001 RDI: ffff88809d60b3f0
RBP: ffffc90008f17b68 R08: 0000000000000000 R09: 000000000000001f
R10: ffff88821881cc1f R11: ffffed1043103983 R12: ffff888218894000
R13: 000000010000000c R14: ffff8882188944a0 R15: ffff8880a3b67c00
FS:  0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d5ca3006c CR3: 000000009a5a7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_cursor+0x169/0x1b0 drivers/tty/vt/vt.c:909
 redraw_screen+0x55b/0x730 drivers/tty/vt/vt.c:1025
 complete_change_console+0x103/0x310 drivers/tty/vt/vt_ioctl.c:1274
 change_console+0x147/0x240 drivers/tty/vt/vt_ioctl.c:1399
 console_callback+0x322/0x390 drivers/tty/vt/vt.c:2844
 process_one_work+0x893/0x1690 kernel/workqueue.c:2268
 worker_thread+0x85/0xb60 kernel/workqueue.c:2414
 kthread+0x354/0x420 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace a583c1688b9fed63 ]---
RIP: 0010:fbcon_cursor+0x10f/0x570 drivers/video/fbdev/core/fbcon.c:1389
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0b 04 00 00 4c 8b ab f0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 d9
RSP: 0018:ffffc90008f17b28 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff88809d60b000 RCX: 0000000000000002
RDX: 0000000020000001 RSI: 0000000000000001 RDI: ffff88809d60b3f0
RBP: ffffc90008f17b68 R08: 0000000000000000 R09: 000000000000001f
R10: ffff88821881cc1f R11: ffffed1043103983 R12: ffff888218894000
R13: 000000010000000c R14: ffff8882188944a0 R15: ffff8880a3b67c00
FS:  0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d5ca3006c CR3: 000000009a5a7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400