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=153ae86b280000 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=12fcd517280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15de5137280000 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 <jiri@xxxxxxxxxx> Date: Mon Feb 6 09:41:51 2023 +0000 devlink: change port event netdev notifier from per-net to global bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1010a337280000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1210a337280000 console output: https://syzkaller.appspot.com/x/log.txt?x=1410a337280000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+622bba18029bcde672e1@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 565b4824c39f ("devlink: change port event netdev notifier from per-net to global") divide error: 0000 [#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:ffffc90003bdfa00 EFLAGS: 00010206 RAX: 000000000001f400 RBX: 0000000000000400 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff84a1069c RDI: 0000000000000003 RBP: 000000000001f400 R08: 0000000000000003 R09: 0000000000000001 R10: 0000000000000400 R11: ffffffff81d6ebf5 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000008 FS: 00005555561e3300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007b315000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> 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:00007fff9cb913d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fca321fac59 RDX: 0000000020000180 RSI: 00000000c06864a2 RDI: 0000000000000003 RBP: 00007fca321ba4d0 R08: 00000000fffff4e6 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007fca321ba560 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- 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:ffffc90003bdfa00 EFLAGS: 00010206 RAX: 000000000001f400 RBX: 0000000000000400 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff84a1069c RDI: 0000000000000003 RBP: 000000000001f400 R08: 0000000000000003 R09: 0000000000000001 R10: 0000000000000400 R11: ffffffff81d6ebf5 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000008 FS: 00005555561e3300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007b315000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e8 58 3c e3 fc callq 0xfce33c5d 5: 66 83 fb 01 cmp $0x1,%bx 9: 76 09 jbe 0x14 b: e8 4d 40 e3 fc callq 0xfce3405d 10: 44 0f af e3 imul %ebx,%r12d 14: e8 44 40 e3 fc callq 0xfce3405d 19: 48 69 ed e8 03 00 00 imul $0x3e8,%rbp,%rbp 20: 44 89 e0 mov %r12d,%eax 23: 31 d2 xor %edx,%edx 25: d1 e8 shr %eax 27: 48 01 e8 add %rbp,%rax * 2a: 49 f7 f4 div %r12 <-- trapping instruction 2d: 49 89 c4 mov %rax,%r12 30: eb 03 jmp 0x35 32: 45 31 e4 xor %r12d,%r12d 35: e8 23 40 e3 fc callq 0xfce3405d 3a: 44 89 e0 mov %r12d,%eax 3d: 5b pop %rbx 3e: 5d pop %rbp 3f: 41 rex.B --- This report 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 syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
