bisecting fixing commit since dafd634415a7f9892a6fcc99c540fe567ab42c92 building syzkaller on 426631ddb41a12ad156d0254fea375a9dfa607fc testing commit dafd634415a7f9892a6fcc99c540fe567ab42c92 with gcc (GCC) 8.1.0 kernel signature: fb7290e2820bb2ba5ff98f28344bf44513ab25d7 all runs: crashed: WARNING in xfrm_policy_insert testing current HEAD 7d120bf21c05cbe30a679f0feeca884eeaceb069 testing commit 7d120bf21c05cbe30a679f0feeca884eeaceb069 with gcc (GCC) 8.1.0 kernel signature: 3b8b02903a22ea51fc37bc4240b00e5a9d93e061 all runs: crashed: WARNING in xfrm_policy_insert revisions tested: 2, total time: 30m47.545448992s (build: 16m59.865947891s, test: 13m13.518501597s) the crash still happens on HEAD commit msg: Linux 4.19.90 crash: WARNING in xfrm_policy_insert netlink: 88 bytes leftover after parsing attributes in process `syz-executor.3'. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 21466 at net/xfrm/xfrm_policy.c:761 xfrm_policy_insert.cold.57+0x18/0xb4 net/xfrm/xfrm_policy.c:761 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 21466 Comm: syz-executor.3 Not tainted 4.19.90-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+0x123/0x177 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e kernel/panic.c:541 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 kobject: 'loop1' (00000000ef09707d): kobject_uevent_env do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:xfrm_policy_insert.cold.57+0x18/0xb4 net/xfrm/xfrm_policy.c:761 Code: 8b 75 d0 eb a9 48 89 df e8 8d 12 ff fb 8b 75 d0 eb de 48 c7 c7 20 30 5e 87 4c 89 45 88 48 89 4d 90 4c 89 4d 98 e8 cf 6b bc fb <0f> 0b 4c 8b 45 88 4c 89 f0 83 e0 07 4c 8b 4d 98 83 c0 03 48 8b 4d RSP: 0018:ffff88808117f478 EFLAGS: 00010286 RAX: 0000000000000024 RBX: ffff88807aaa5200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff86ff2260 RDI: ffffffff89a866a0 RBP: ffff88808117f510 R08: ffffed1015d45079 R09: ffffed1015d45078 R10: ffffed1015d45078 R11: ffff8880aea283c7 R12: dffffc0000000000 R13: ffff88808f17a000 R14: ffff88808f17a0b4 R15: ffff8880a1734d80 xfrm_add_policy+0x22f/0x520 net/xfrm/xfrm_user.c:1669 xfrm_user_rcv_msg+0x34c/0x710 net/xfrm/xfrm_user.c:2677 kobject: 'loop1' (00000000ef09707d): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000ce6feb45): kobject_uevent_env netlink_rcv_skb+0x142/0x390 net/netlink/af_netlink.c:2454 xfrm_netlink_rcv+0x69/0x90 net/xfrm/xfrm_user.c:2685 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x445/0x640 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1908 kobject: 'loop2' (00000000ce6feb45): fill_kobj_path: path = '/devices/virtual/block/loop2' sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 kobject: 'loop4' (00000000d09ee0a4): kobject_uevent_env __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 kobject: 'loop4' (00000000d09ee0a4): fill_kobj_path: path = '/devices/virtual/block/loop4' entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2acf280c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2acf2816d4 R13: 00000000004c7bff R14: 00000000004dd998 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..