kasan: GPF could be caused by NULL-ptr deref or user memory access
loop3: rw=12288, want=8200, limit=20
EXT4-fs (loop5): get root inode failed
F2FS-fs (loop3): Failed to get valid F2FS checkpoint
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10194 Comm: syz-executor.4 Not tainted 4.19.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vgem_fence_attach_ioctl+0x277/0x640 drivers/gpu/drm/vgem/vgem_fence.c:184
EXT4-fs (loop5): mount failed
Code: 03 80 3c 02 00 0f 85 77 03 00 00 4c 8b b5 10 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d be e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 03 00 00 4c 89 ea 4d 8b b6 e0 00 00 00 48 b8
RSP: 0018:ffff888045d5fae8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880914970c0 RCX: 1ffff11008babf4a
RDX: 000000000000001c RSI: ffffffff8161ec28 RDI: 00000000000000e0
RBP: ffff88809337a0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888096bc2bc0
R13: ffff8880914970c4 R14: 0000000000000000 R15: ffff888096bc2c58
FS:  00007f72814aa700(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30a28000 CR3: 000000009b395000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 drm_ioctl_kernel+0x208/0x2a0 drivers/gpu/drm/drm_ioctl.c:757
 drm_ioctl+0x515/0x9e0 drivers/gpu/drm/drm_ioctl.c:857
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45e179
Code: 3d b2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b b2 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f72814a9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000c540 RCX: 000000000045e179
RDX: 0000000020000140 RSI: 00000000c10c5541 RDI: 0000000000000004
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffd4c8544df R14: 00007f72814aa9c0 R15: 000000000118cf4c
Modules linked in:
---[ end trace de17cdda962244ca ]---
RIP: 0010:vgem_fence_attach_ioctl+0x277/0x640 drivers/gpu/drm/vgem/vgem_fence.c:184
Code: 03 80 3c 02 00 0f 85 77 03 00 00 4c 8b b5 10 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d be e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 03 00 00 4c 89 ea 4d 8b b6 e0 00 00 00 48 b8
RSP: 0018:ffff888045d5fae8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880914970c0 RCX: 1ffff11008babf4a
RDX: 000000000000001c RSI: ffffffff8161ec28 RDI: 00000000000000e0
RBP: ffff88809337a0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888096bc2bc0
R13: ffff8880914970c4 R14: 0000000000000000 R15: ffff888096bc2c58
FS:  00007f72814aa700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe510a28010 CR3: 000000009b395000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400