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Message-ID: <000000000000152438061d819d0b@google.com> Date: Thu, 18 Jul 2024 01:46:23 -0700 From: syzbot <syzbot+c6f3c081bf956c97e4de@...kaller.appspotmail.com> To: johannes@...solutions.net, kvalo@...nel.org, linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [wireless?] divide error in mac80211_hwsim_link_info_changed Hello, syzbot found the following issue on: HEAD commit: 51835949dda3 Merge tag 'net-next-6.11' of git://git.kernel.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=15f207a5980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d3bdd09ea2371c89 dashboard link: https://syzkaller.appspot.com/bug?extid=c6f3c081bf956c97e4de compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9690deac1819/disk-51835949.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/54d261dbb3f0/vmlinux-51835949.xz kernel image: https://storage.googleapis.com/syzbot-assets/e61465cd524f/bzImage-51835949.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c6f3c081bf956c97e4de@...kaller.appspotmail.com Oops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.10.0-syzkaller-04472-g51835949dda3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:mac80211_hwsim_link_info_changed+0x409/0xf00 drivers/net/wireless/virtual/mac80211_hwsim.c:2547 Code: 00 fc ff df 43 80 7c 3d 00 00 48 8b 44 24 20 74 0f 48 8b 7c 24 20 e8 a6 ff 0d fb 48 8b 44 24 20 48 8b 08 89 ce 48 89 d8 31 d2 <48> f7 f6 29 d1 48 69 f1 e8 03 00 00 4c 89 f7 31 d2 b9 05 00 00 00 RSP: 0018:ffffc900001077a0 EFLAGS: 00010246 RAX: 00061d780b08a1f3 RBX: 00061d780b08a1f3 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040 RBP: ffffc90000107890 R08: ffffffff8183f431 R09: 1ffffffff25f9ec5 R10: dffffc0000000000 R11: ffffffff813597f0 R12: 0000000000000200 R13: 1ffff1100c778e08 R14: ffff888063bc7048 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c34d35b CR3: 000000006a936000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> drv_link_info_changed+0x53d/0x8b0 ieee80211_offchannel_return+0x3a4/0x530 net/mac80211/offchannel.c:160 __ieee80211_scan_completed+0x77f/0xb60 net/mac80211/scan.c:495 ieee80211_scan_work+0x1cc/0x1da0 net/mac80211/scan.c:1162 cfg80211_wiphy_work+0x2db/0x490 net/wireless/core.c:440 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mac80211_hwsim_link_info_changed+0x409/0xf00 drivers/net/wireless/virtual/mac80211_hwsim.c:2547 Code: 00 fc ff df 43 80 7c 3d 00 00 48 8b 44 24 20 74 0f 48 8b 7c 24 20 e8 a6 ff 0d fb 48 8b 44 24 20 48 8b 08 89 ce 48 89 d8 31 d2 <48> f7 f6 29 d1 48 69 f1 e8 03 00 00 4c 89 f7 31 d2 b9 05 00 00 00 RSP: 0018:ffffc900001077a0 EFLAGS: 00010246 RAX: 00061d780b08a1f3 RBX: 00061d780b08a1f3 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040 RBP: ffffc90000107890 R08: ffffffff8183f431 R09: 1ffffffff25f9ec5 R10: dffffc0000000000 R11: ffffffff813597f0 R12: 0000000000000200 R13: 1ffff1100c778e08 R14: ffff888063bc7048 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37c5e6dfc8 CR3: 000000001f47a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 43 80 filds -0x80(%rbx) 3: 7c 3d jl 0x42 5: 00 00 add %al,(%rax) 7: 48 8b 44 24 20 mov 0x20(%rsp),%rax c: 74 0f je 0x1d e: 48 8b 7c 24 20 mov 0x20(%rsp),%rdi 13: e8 a6 ff 0d fb call 0xfb0dffbe 18: 48 8b 44 24 20 mov 0x20(%rsp),%rax 1d: 48 8b 08 mov (%rax),%rcx 20: 89 ce mov %ecx,%esi 22: 48 89 d8 mov %rbx,%rax 25: 31 d2 xor %edx,%edx * 27: 48 f7 f6 div %rsi <-- trapping instruction 2a: 29 d1 sub %edx,%ecx 2c: 48 69 f1 e8 03 00 00 imul $0x3e8,%rcx,%rsi 33: 4c 89 f7 mov %r14,%rdi 36: 31 d2 xor %edx,%edx 38: b9 05 00 00 00 mov $0x5,%ecx --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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