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Message-ID: <67f88734.050a0220.355867.001b.GAE@google.com> Date: Thu, 10 Apr 2025 20:06:28 -0700 From: syzbot <syzbot+5bb5f06f99924ea0cf86@...kaller.appspotmail.com> To: johannes@...solutions.net, 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 (2) Hello, syzbot found the following issue on: HEAD commit: 16cd1c265776 Merge tag 'timers-cleanups-2025-04-06' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14b1bd98580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f2054704dd53fb80 dashboard link: https://syzkaller.appspot.com/bug?extid=5bb5f06f99924ea0cf86 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/20e7988b77fa/disk-16cd1c26.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aca60f83d6d9/vmlinux-16cd1c26.xz kernel image: https://storage.googleapis.com/syzbot-assets/b56870bab231/bzImage-16cd1c26.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5bb5f06f99924ea0cf86@...kaller.appspotmail.com Oops: divide error: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted 6.14.0-syzkaller-13546-g16cd1c265776 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:mac80211_hwsim_link_info_changed+0x42a/0xf10 drivers/net/wireless/virtual/mac80211_hwsim.c:2549 Code: 00 49 89 c5 74 08 4c 89 ff e8 22 25 cf fa 49 8b 0f 89 ce 48 89 d8 48 c1 e8 20 4c 8b 74 24 10 0f 84 18 01 00 00 48 89 d8 31 d2 <48> f7 f6 e9 11 01 00 00 e8 89 fb 64 fa eb 05 e8 82 fb 64 fa 4c 8d RSP: 0018:ffffc90000117700 EFLAGS: 00010246 RAX: 000632276c5d693b RBX: 000632276c5d693b RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040 RBP: ffffc900001177f0 R08: ffffffff81b0eef1 R09: 1ffffffff20bfbee R10: dffffc0000000000 R11: ffffffff81624770 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff92000022eec R15: ffff88807a30f040 FS: 0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000008000579c CR3: 0000000068a92000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> drv_link_info_changed+0x53d/0x8b0 net/mac80211/driver-ops.c:-1 ieee80211_offchannel_return+0x3a4/0x530 net/mac80211/offchannel.c:160 __ieee80211_scan_completed+0x77f/0xb60 net/mac80211/scan.c:495 ieee80211_scan_work+0x1d6/0x1dd0 net/mac80211/scan.c:1162 cfg80211_wiphy_work+0x2f0/0x490 net/wireless/core.c:435 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mac80211_hwsim_link_info_changed+0x42a/0xf10 drivers/net/wireless/virtual/mac80211_hwsim.c:2549 Code: 00 49 89 c5 74 08 4c 89 ff e8 22 25 cf fa 49 8b 0f 89 ce 48 89 d8 48 c1 e8 20 4c 8b 74 24 10 0f 84 18 01 00 00 48 89 d8 31 d2 <48> f7 f6 e9 11 01 00 00 e8 89 fb 64 fa eb 05 e8 82 fb 64 fa 4c 8d RSP: 0018:ffffc90000117700 EFLAGS: 00010246 RAX: 000632276c5d693b RBX: 000632276c5d693b RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040 RBP: ffffc900001177f0 R08: ffffffff81b0eef1 R09: 1ffffffff20bfbee R10: dffffc0000000000 R11: ffffffff81624770 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff92000022eec R15: ffff88807a30f040 FS: 0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000080065018 CR3: 000000005144e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 49 89 c5 mov %rax,%r13 3: 74 08 je 0xd 5: 4c 89 ff mov %r15,%rdi 8: e8 22 25 cf fa call 0xfacf252f d: 49 8b 0f mov (%r15),%rcx 10: 89 ce mov %ecx,%esi 12: 48 89 d8 mov %rbx,%rax 15: 48 c1 e8 20 shr $0x20,%rax 19: 4c 8b 74 24 10 mov 0x10(%rsp),%r14 1e: 0f 84 18 01 00 00 je 0x13c 24: 48 89 d8 mov %rbx,%rax 27: 31 d2 xor %edx,%edx * 29: 48 f7 f6 div %rsi <-- trapping instruction 2c: e9 11 01 00 00 jmp 0x142 31: e8 89 fb 64 fa call 0xfa64fbbf 36: eb 05 jmp 0x3d 38: e8 82 fb 64 fa call 0xfa64fbbf 3d: 4c rex.WR 3e: 8d .byte 0x8d --- 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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