Hello, syzbot found the following issue on: HEAD commit: fac3cb82a54a net: bridge: mcast: use multicast_membership_.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=144efe78b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=bab9d35f204746a7 dashboard link: https://syzkaller.appspot.com/bug?extid=5f110beab9fb01e48be5 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5f110beab9fb01e48be5@xxxxxxxxxxxxxxxxxxxxxxxxx divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1140 Comm: kworker/u4:4 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy9 ieee80211_roc_work RIP: 0010:mac80211_hwsim_bss_info_changed+0xd37/0xf10 drivers/net/wireless/mac80211_hwsim.c:2033 Code: 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 0f 85 96 01 00 00 49 8b b6 a0 3c 00 00 49 8d be 40 3d 00 00 31 d2 89 f1 <48> f7 f1 29 d6 b9 05 00 00 00 31 d2 48 69 f6 e8 03 00 00 e8 d1 1f RSP: 0018:ffffc9000550fb70 EFLAGS: 00010246 RAX: 0005ce87f3fb02a5 RBX: 0000000000000200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807783efe0 RBP: ffff88801af8e088 R08: 000000000000f8c6 R09: ffffffff8fcffa47 R10: ffffffff8167242f R11: 0000000000000000 R12: ffff888077838d60 R13: ffff88807783ef40 R14: ffff88807783b2a0 R15: ffff88807783b2a0 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffee3e2afcc CR3: 000000004efc2000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drv_bss_info_changed+0x2c6/0x5f0 net/mac80211/driver-ops.h:177 ieee80211_bss_info_change_notify+0x9a/0xc0 net/mac80211/main.c:210 ieee80211_offchannel_return+0x330/0x4a0 net/mac80211/offchannel.c:158 __ieee80211_roc_work+0x35a/0x3d0 net/mac80211/offchannel.c:444 ieee80211_roc_work+0x2b/0x40 net/mac80211/offchannel.c:458 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace ff9a982d4a81be98 ]--- RIP: 0010:mac80211_hwsim_bss_info_changed+0xd37/0xf10 drivers/net/wireless/mac80211_hwsim.c:2033 Code: 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 0f 85 96 01 00 00 49 8b b6 a0 3c 00 00 49 8d be 40 3d 00 00 31 d2 89 f1 <48> f7 f1 29 d6 b9 05 00 00 00 31 d2 48 69 f6 e8 03 00 00 e8 d1 1f RSP: 0018:ffffc9000550fb70 EFLAGS: 00010246 RAX: 0005ce87f3fb02a5 RBX: 0000000000000200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807783efe0 RBP: ffff88801af8e088 R08: 000000000000f8c6 R09: ffffffff8fcffa47 R10: ffffffff8167242f R11: 0000000000000000 R12: ffff888077838d60 R13: ffff88807783ef40 R14: ffff88807783b2a0 R15: ffff88807783b2a0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1b6573a218 CR3: 00000000271f2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 7: fc ff df a: 48 c1 e9 03 shr $0x3,%rcx e: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) 12: 0f 85 96 01 00 00 jne 0x1ae 18: 49 8b b6 a0 3c 00 00 mov 0x3ca0(%r14),%rsi 1f: 49 8d be 40 3d 00 00 lea 0x3d40(%r14),%rdi 26: 31 d2 xor %edx,%edx 28: 89 f1 mov %esi,%ecx * 2a: 48 f7 f1 div %rcx <-- trapping instruction 2d: 29 d6 sub %edx,%esi 2f: b9 05 00 00 00 mov $0x5,%ecx 34: 31 d2 xor %edx,%edx 36: 48 69 f6 e8 03 00 00 imul $0x3e8,%rsi,%rsi 3d: e8 .byte 0xe8 3e: d1 1f rcrl (%rdi) --- 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.
