syzbot has found a reproducer for the following crash on: HEAD commit: 4f8a3cc1 Merge tag 'x86-urgent-2020-04-12' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=110243b3e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=3bfbde87e8e65624 dashboard link: https://syzkaller.appspot.com/bug?extid=a4aee3f42d7584d76761 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=100825afe00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10df613fe00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a4aee3f42d7584d76761@xxxxxxxxxxxxxxxxxxxxxxxxx netlink: 98586 bytes leftover after parsing attributes in process `syz-executor425'. ------------[ cut here ]------------ precision 33020 too large WARNING: CPU: 1 PID: 6998 at lib/vsprintf.c:2471 set_precision lib/vsprintf.c:2471 [inline] WARNING: CPU: 1 PID: 6998 at lib/vsprintf.c:2471 vsnprintf+0x1467/0x1aa0 lib/vsprintf.c:2547 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6998 Comm: syz-executor425 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1e9/0x30e lib/dump_stack.c:118 panic+0x264/0x7a0 kernel/panic.c:221 __warn+0x209/0x210 kernel/panic.c:582 report_bug+0x1ac/0x2d0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:set_precision lib/vsprintf.c:2471 [inline] RIP: 0010:vsnprintf+0x1467/0x1aa0 lib/vsprintf.c:2547 Code: a6 bb fd 48 8d 5c 24 48 e9 8e fc ff ff e8 01 a6 bb fd c6 05 bf 06 b0 05 01 48 c7 c7 c1 d3 f2 88 44 89 fe 31 c0 e8 29 ba 8d fd <0f> 0b e9 b7 f6 ff ff e8 dd a5 bb fd c6 05 9a 06 b0 05 01 48 c7 c7 RSP: 0018:ffffc90001647780 EFLAGS: 00010246 RAX: 2f9f2ace1f35b900 RBX: ffffc900016477c8 RCX: ffff88809d86c2c0 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: 80fc0000ffffff02 R08: dffffc0000000000 R09: fffffbfff1628ea5 R10: fffffbfff1628ea5 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: ffffffff88ea3058 R15: 00000000000080fc kvasprintf+0x59/0xf0 lib/kasprintf.c:22 kasprintf+0x6a/0x90 lib/kasprintf.c:59 hwsim_new_radio_nl+0x95c/0xf30 drivers/net/wireless/mac80211_hwsim.c:3672 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x1054/0x1530 net/netlink/genetlink.c:735 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1329 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x4f9/0x7c0 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmsg+0x2a6/0x360 net/socket.c:2449 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x4401f9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffecc373af8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80 R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..
