bisecting fixing commit since 0c88e405c97ed1828443b67891e6d4bb6e56cd4e
building syzkaller on e34b696c0d7c04dbc824dee8b5123969bbca19b7
testing commit 0c88e405c97ed1828443b67891e6d4bb6e56cd4e with gcc (GCC) 8.1.0
kernel signature: a778c547aa83922933cbb0c4570ac737d4d653eaef3031fe6a24666617d9eb75
run #0: crashed: WARNING in mutex_destroy
run #1: crashed: WARNING in mutex_destroy
run #2: crashed: general protection fault in vgem_fence_attach_ioctl
run #3: crashed: general protection fault in vgem_fence_attach_ioctl
run #4: crashed: WARNING in mutex_destroy
run #5: crashed: general protection fault in vgem_fence_attach_ioctl
run #6: crashed: WARNING in mutex_destroy
run #7: crashed: general protection fault in vgem_fence_attach_ioctl
run #8: crashed: general protection fault in vgem_fence_attach_ioctl
run #9: crashed: WARNING in mutex_destroy
testing current HEAD 13d2ce42de8cb98ff952f8de6307f896203854c2
testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0
kernel signature: f8e7c2cd0f2e29f9c48c7e29811d87d3063b5dd6aa7d3fafbe3ca91099381b02
run #0: crashed: general protection fault in vgem_fence_attach_ioctl
run #1: crashed: WARNING in mutex_destroy
run #2: crashed: WARNING in mutex_destroy
run #3: crashed: general protection fault in vgem_fence_attach_ioctl
run #4: crashed: general protection fault in vgem_fence_attach_ioctl
run #5: crashed: WARNING in mutex_destroy
run #6: crashed: general protection fault in vgem_fence_attach_ioctl
run #7: crashed: general protection fault in vgem_fence_attach_ioctl
run #8: crashed: WARNING in mutex_destroy
run #9: crashed: general protection fault in vgem_fence_attach_ioctl
revisions tested: 2, total time: 38m14.813372442s (build: 17m33.09625093s, test: 19m59.902847233s)
the crash still happens on HEAD
commit msg: Linux 4.19.163
crash: general protection fault in vgem_fence_attach_ioctl
bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
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
CPU: 0 PID: 2128 Comm: syz-executor659 Not tainted 4.19.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vgem_fence_attach_ioctl+0x24f/0x580 drivers/gpu/drm/vgem/vgem_fence.c:184
Code: 03 80 3c 02 00 0f 85 01 03 00 00 4d 8b bd 10 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bf e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ce 02 00 00 49 8b 87 e0 00 00 00 4c 89 f2 48 c1
RSP: 0018:ffff8881d675fa70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881cdeb9080 RCX: 0000000000000000
RDX: 000000000000001c RSI: 0000000000000001 RDI: 00000000000000e0
RBP: ffff8881d675fab0 R08: ffffed103ec84561 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d5577b80
R13: ffff8881d44a0a80 R14: ffff8881cdeb9084 R15: 0000000000000000
FS:  00007f7ebcf32700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7ebceefe78 CR3: 00000001c46a1006 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 drm_ioctl_kernel+0x1b7/0x240 drivers/gpu/drm/drm_ioctl.c:757
 drm_ioctl+0x6a9/0xae0 drivers/gpu/drm/drm_ioctl.c:857
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44a6c9
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 fb ca fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7ebcf31db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 000000000044a6c9
RDX: 0000000020000140 RSI: 00000000c10c5541 RDI: 0000000000000005
RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c
R13: 00007ffcf54d699f R14: 00007f7ebcf329c0 R15: 0000000000000000
Modules linked in:
---[ end trace 58bc4fcdb865ffe3 ]---
RIP: 0010:vgem_fence_attach_ioctl+0x24f/0x580 drivers/gpu/drm/vgem/vgem_fence.c:184
Code: 03 80 3c 02 00 0f 85 01 03 00 00 4d 8b bd 10 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bf e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ce 02 00 00 49 8b 87 e0 00 00 00 4c 89 f2 48 c1
RSP: 0018:ffff8881d675fa70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881cdeb9080 RCX: 0000000000000000
RDX: 000000000000001c RSI: 0000000000000001 RDI: 00000000000000e0
RBP: ffff8881d675fab0 R08: ffffed103ec84561 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d5577b80
R13: ffff8881d44a0a80 R14: ffff8881cdeb9084 R15: 0000000000000000
FS:  00007f7ebcf32700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7ebcf31e78 CR3: 00000001c46a1003 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400