Hello,
syzbot found the following issue on:
HEAD commit:1639fae5132b Merge tag 'drm-fixes-2023-06-17' of git://ano..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=153ae86b28
kernel config: https://syzkaller.appspot.com/x/.config?x=ac246111fb601aec
dashboard link: https://syzkaller.appspot.com/bug?extid=622bba18029bcde672e1
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for
Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12fcd51728
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15de513728
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/ddaf9fb256b7/disk-1639fae5.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/82b7be81b931/vmlinux-1639fae5.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/926a973a103a/bzImage-1639fae5.xz
The issue was bisected to:
commit 565b4824c39fa335cba2028a09d7beb7112f3c9a
Author: Jiri Pirko
Date: Mon Feb 6 09:41:51 2023 +
devlink: change port event netdev notifier from per-net to global
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1010a33728
final oops: https://syzkaller.appspot.com/x/report.txt?x=1210a33728
console output: https://syzkaller.appspot.com/x/log.txt?x=1410a33728
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+622bba18029bcde67...@syzkaller.appspotmail.com
Fixes: 565b4824c39f ("devlink: change port event netdev notifier from per-net
to global")
divide error: [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5003 Comm: syz-executor375 Not tainted
6.4.0-rc6-syzkaller-00242-g1639fae5132b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google
05/27/2023
RIP: 0010:drm_mode_vrefresh+0x19d/0x1f0 drivers/gpu/drm/drm_modes.c:1303
Code: e8 58 3c e3 fc 66 83 fb 01 76 09 e8 4d 40 e3 fc 44 0f af e3 e8 44 40 e3
fc 48 69 ed e8 03 00 00 44 89 e0 31 d2 d1 e8 48 01 e8 <49> f7 f4 49 89 c4 eb 03
45 31 e4 e8 23 40 e3 fc 44 89 e0 5b 5d 41
RSP: 0018:c90003bdfa00 EFLAGS: 00010206
RAX: 0001f400 RBX: 0400 RCX:
RDX: RSI: 84a1069c RDI: 0003
RBP: 0001f400 R08: 0003 R09: 0001
R10: 0400 R11: 81d6ebf5 R12:
R13: R14: R15: 0008
FS: 561e3300() GS:8880b990() knlGS:
CS: 0010 DS: ES: CR0: 80050033
CR2: 005fdeb8 CR3: 7b315000 CR4: 003506e0
DR0: DR1: DR2:
DR3: DR6: fffe0ff0 DR7: 0400
Call Trace:
drm_mode_debug_printmodeline+0x22c/0x2f0 drivers/gpu/drm/drm_modes.c:60
drm_mode_setcrtc+0x116b/0x1650 drivers/gpu/drm/drm_crtc.c:794
drm_ioctl_kernel+0x281/0x4e0 drivers/gpu/drm/drm_ioctl.c:788
drm_ioctl+0x577/0xb30 drivers/gpu/drm/drm_ioctl.c:891
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fca321fac59
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01
c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:7fff9cb913d8 EFLAGS: 0246 ORIG_RAX: 0010
RAX: ffda RBX: RCX: 7fca321fac59
RDX: 2180 RSI: c06864a2 RDI: 0003
RBP: 7fca321ba4d0 R08: f4e6 R09:
R10: 0003 R11: 0246 R12: 7fca321ba560
R13: R14: R15:
Modules linked in:
---[ end trace ]---
RIP: 0010:drm_mode_vrefresh+0x19d/0x1f0 drivers/gpu/drm/drm_modes.c:1303
Code: e8 58 3c e3 fc 66 83 fb 01 76 09 e8 4d 40 e3 fc 44 0f af e3 e8 44 40 e3
fc 48 69 ed e8 03 00 00 44 89 e0 31 d2 d1 e8 48 01 e8 <49> f7 f4 49 89 c4 eb 03
45 31 e4 e8 23 40 e3 fc 44 89 e0 5b 5d 41
RSP: 0018:c90003bdfa00 EFLAGS: 00010206
RAX: 0001f400 RBX: 0400 RCX:
RDX: RSI: 84a1069c RDI: 0003
RBP: 0001f400 R08: 0003 R09: 0001
R10: 0400 R11: 81d6ebf5 R12:
R13: R14: R15: 0008
FS: 561e3300() GS:8880b990() knlGS:
CS: 0010 DS: ES: CR0: 80050033
CR2: 005fdeb8 CR3: 7b315000 CR4: 003506e0
DR0: DR1: DR2:
DR3: DR6: fffe0ff0 DR7:
