general protection fault in drm_dp_aux_dev_get_by_minor
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syzbot
Jun 8, 2020, 1:41:15 AM6/8/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: c6db52a8 Linux 4.14.183
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1523d27a100000
kernel config: https://syzkaller.appspot.com/x/.config?x=98bbe4d18401ff4
dashboard link: https://syzkaller.appspot.com/bug?extid=67a5a7057e7c42180d38
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+67a5a7...@syzkaller.appspotmail.com
audit: type=1800 audit(1591594809.219:360): pid=25627 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=18011 res=0
MINIX-fs: mounting unchecked file system, running fsck is recommended
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: 1 PID: 25627 Comm: syz-executor.5 Not tainted 4.14.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88801f39e380 task.stack: ffff888212980000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline]
RIP: 0010:refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline]
RIP: 0010:kref_get_unless_zero include/linux/kref.h:116 [inline]
RIP: 0010:drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63
RSP: 0018:ffff8882129879d8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 00000000000000b1 RCX: ffffc90009740000
RDX: 0000000000000003 RSI: ffffffff8639084f RDI: ffffffff8801b5c0
RBP: 0000000000000018 R08: ffffffff8a380bc0 R09: 0000000000000002
R10: ffff8882129879d8 R11: ffff88801f39e380 R12: 0000000000000000
R13: ffff88809502ed40 R14: ffffffff8353b400 R15: ffff88809502ed68
FS: 00007fc724329700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000020e8c0000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
auxdev_open+0x47/0xa0 drivers/gpu/drm/drm_dp_aux_dev.c:131
chrdev_open+0x1fc/0x540 fs/char_dev.c:423
do_dentry_open+0x44b/0xec0 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0xb68/0x2aa0 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
file_open_name+0x206/0x260 fs/open.c:1008
acct_on kernel/acct.c:207 [inline]
SYSC_acct kernel/acct.c:286 [inline]
SyS_acct+0xcb/0x850 kernel/acct.c:273
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45ca69
RSP: 002b:00007fc724328c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3
RAX: ffffffffffffffda RBX: 00000000004d9580 RCX: 000000000045ca69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000480
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000001c R14: 00000000004c2e08 R15: 00007fc7243296d4
Code: e8 15 eb e9 02 89 de 48 c7 c7 c0 b5 01 88 e8 c7 56 e5 02 48 8d 68 18 49 89 c4 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <0f> b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 66
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8882129879d8
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff8882129879d8
RIP: refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline] RSP: ffff8882129879d8
RIP: refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline] RSP: ffff8882129879d8
RIP: kref_get_unless_zero include/linux/kref.h:116 [inline] RSP: ffff8882129879d8
RIP: drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63 RSP: ffff8882129879d8
print_req_error: I/O error, dev loop1, sector 0
sctp: [Deprecated]: syz-executor.2 (pid 25643) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
---[ end trace 26ffae5e6b9ad1ab ]---
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: c6db52a8 Linux 4.14.183
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1523d27a100000
kernel config: https://syzkaller.appspot.com/x/.config?x=98bbe4d18401ff4
dashboard link: https://syzkaller.appspot.com/bug?extid=67a5a7057e7c42180d38
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+67a5a7...@syzkaller.appspotmail.com
audit: type=1800 audit(1591594809.219:360): pid=25627 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=18011 res=0
MINIX-fs: mounting unchecked file system, running fsck is recommended
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: 1 PID: 25627 Comm: syz-executor.5 Not tainted 4.14.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88801f39e380 task.stack: ffff888212980000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline]
RIP: 0010:refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline]
RIP: 0010:kref_get_unless_zero include/linux/kref.h:116 [inline]
RIP: 0010:drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63
RSP: 0018:ffff8882129879d8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 00000000000000b1 RCX: ffffc90009740000
RDX: 0000000000000003 RSI: ffffffff8639084f RDI: ffffffff8801b5c0
RBP: 0000000000000018 R08: ffffffff8a380bc0 R09: 0000000000000002
R10: ffff8882129879d8 R11: ffff88801f39e380 R12: 0000000000000000
R13: ffff88809502ed40 R14: ffffffff8353b400 R15: ffff88809502ed68
FS: 00007fc724329700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000020e8c0000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
auxdev_open+0x47/0xa0 drivers/gpu/drm/drm_dp_aux_dev.c:131
chrdev_open+0x1fc/0x540 fs/char_dev.c:423
do_dentry_open+0x44b/0xec0 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0xb68/0x2aa0 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
file_open_name+0x206/0x260 fs/open.c:1008
acct_on kernel/acct.c:207 [inline]
SYSC_acct kernel/acct.c:286 [inline]
SyS_acct+0xcb/0x850 kernel/acct.c:273
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45ca69
RSP: 002b:00007fc724328c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3
RAX: ffffffffffffffda RBX: 00000000004d9580 RCX: 000000000045ca69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000480
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000001c R14: 00000000004c2e08 R15: 00007fc7243296d4
Code: e8 15 eb e9 02 89 de 48 c7 c7 c0 b5 01 88 e8 c7 56 e5 02 48 8d 68 18 49 89 c4 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <0f> b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 66
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8882129879d8
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff8882129879d8
RIP: refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline] RSP: ffff8882129879d8
RIP: refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline] RSP: ffff8882129879d8
RIP: kref_get_unless_zero include/linux/kref.h:116 [inline] RSP: ffff8882129879d8
RIP: drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63 RSP: ffff8882129879d8
print_req_error: I/O error, dev loop1, sector 0
sctp: [Deprecated]: syz-executor.2 (pid 25643) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
---[ end trace 26ffae5e6b9ad1ab ]---
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jun 8, 2020, 2:06:14 AM6/8/20
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: c6db52a8 Linux 4.14.183
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11384e1e100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=126bda96100000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+67a5a7...@syzkaller.appspotmail.com
RAX: dffffc0000000000 RBX: 00000000000000b1 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 00000000000000b1 RDI: ffffffff8801b5c0
R13: ffff8880a97e7d40 R14: ffffffff8353b400 R15: ffff8880a97e7d68
FS: 00000000024c7940(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
RSP: 002b:00007ffc3e098d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3
RAX: ffffffffffffffda RBX: 00007ffc3e098d20 RCX: 0000000000444ac9
RDX: 0000000000401470 RSI: 76a48c1cd11c080b RDI: 0000000020000480
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400eb0
R10: 00007ffc3e098bf0 R11: 0000000000000246 R12: 0000000000402730
R13: 00000000004027c0 R14: 0000000000000000 R15: 0000000000000000
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff8880888879d8
RIP: refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline] RSP: ffff8880888879d8
RIP: refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline] RSP: ffff8880888879d8
RIP: kref_get_unless_zero include/linux/kref.h:116 [inline] RSP: ffff8880888879d8
RIP: drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63 RSP: ffff8880888879d8
---[ end trace 3645b4fd0cf0886f ]---
HEAD commit: c6db52a8 Linux 4.14.183
git tree: linux-4.14.y
kernel config: https://syzkaller.appspot.com/x/.config?x=98bbe4d18401ff4
dashboard link: https://syzkaller.appspot.com/bug?extid=67a5a7057e7c42180d38
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1336c246100000
dashboard link: https://syzkaller.appspot.com/bug?extid=67a5a7057e7c42180d38
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=126bda96100000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+67a5a7...@syzkaller.appspotmail.com
MINIX-fs: mounting unchecked file system, running fsck is recommended
audit: type=1800 audit(1591596169.797:9): pid=6334 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor608" name="file0" dev="sda1" ino=15705 res=0
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: 1 PID: 6334 Comm: syz-executor608 Not tainted 4.14.183-syzkaller #0
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880978ba080 task.stack: ffff888088880000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline]
RIP: 0010:refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline]
RIP: 0010:kref_get_unless_zero include/linux/kref.h:116 [inline]
RIP: 0010:drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63
RSP: 0018:ffff8880888879d8 EFLAGS: 00010206
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline]
RIP: 0010:refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline]
RIP: 0010:kref_get_unless_zero include/linux/kref.h:116 [inline]
RIP: 0010:drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63
RAX: dffffc0000000000 RBX: 00000000000000b1 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 00000000000000b1 RDI: ffffffff8801b5c0
RBP: 0000000000000018 R08: ffffffff8a380bc0 R09: 0000000000000002
R10: ffff8880888879d8 R11: ffff8880978ba080 R12: 0000000000000000
R13: ffff8880a97e7d40 R14: ffffffff8353b400 R15: ffff8880a97e7d68
FS: 00000000024c7940(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555568613b88 CR3: 00000000a8bf4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
auxdev_open+0x47/0xa0 drivers/gpu/drm/drm_dp_aux_dev.c:131
chrdev_open+0x1fc/0x540 fs/char_dev.c:423
do_dentry_open+0x44b/0xec0 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0xb68/0x2aa0 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
file_open_name+0x206/0x260 fs/open.c:1008
acct_on kernel/acct.c:207 [inline]
SYSC_acct kernel/acct.c:286 [inline]
SyS_acct+0xcb/0x850 kernel/acct.c:273
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x444ac9
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
auxdev_open+0x47/0xa0 drivers/gpu/drm/drm_dp_aux_dev.c:131
chrdev_open+0x1fc/0x540 fs/char_dev.c:423
do_dentry_open+0x44b/0xec0 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0xb68/0x2aa0 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
file_open_name+0x206/0x260 fs/open.c:1008
acct_on kernel/acct.c:207 [inline]
SYSC_acct kernel/acct.c:286 [inline]
SyS_acct+0xcb/0x850 kernel/acct.c:273
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RSP: 002b:00007ffc3e098d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3
RAX: ffffffffffffffda RBX: 00007ffc3e098d20 RCX: 0000000000444ac9
RDX: 0000000000401470 RSI: 76a48c1cd11c080b RDI: 0000000020000480
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400eb0
R10: 00007ffc3e098bf0 R11: 0000000000000246 R12: 0000000000402730
R13: 00000000004027c0 R14: 0000000000000000 R15: 0000000000000000
Code: e8 15 eb e9 02 89 de 48 c7 c7 c0 b5 01 88 e8 c7 56 e5 02 48 8d 68 18 49 89 c4 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <0f> b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 66
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8880888879d8
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff8880888879d8
RIP: refcount_add_not_zero arch/x86/include/asm/refcount.h:84 [inline] RSP: ffff8880888879d8
RIP: refcount_inc_not_zero arch/x86/include/asm/refcount.h:106 [inline] RSP: ffff8880888879d8
RIP: kref_get_unless_zero include/linux/kref.h:116 [inline] RSP: ffff8880888879d8
RIP: drm_dp_aux_dev_get_by_minor+0x41/0xd0 drivers/gpu/drm/drm_dp_aux_dev.c:63 RSP: ffff8880888879d8
---[ end trace 3645b4fd0cf0886f ]---
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