bisecting fixing commit since e3c1b27308ae0472f27e07903181d6abfe0cb1d7
building syzkaller on 55565fa0377f97cf09bfab365707e08b0156c11b
testing commit e3c1b27308ae0472f27e07903181d6abfe0cb1d7 with gcc (GCC) 8.1.0
kernel signature: 9d5e217d816f7d1fa456168525037b2d7cc06a70d26c147a6ea0e96a9d08a80b
all runs: crashed: WARNING in ovl_create_or_link
testing current HEAD 78d697fc93f98054e36a3ab76dca1a88802ba7be
testing commit 78d697fc93f98054e36a3ab76dca1a88802ba7be with gcc (GCC) 8.1.0
kernel signature: b005d6f59cf82d0ba351099a573fc749b493e80dab2ff658e15bacd8ec096da6
all runs: crashed: WARNING in ovl_create_or_link
revisions tested: 2, total time: 24m10.623335238s (build: 15m47.530068128s, test: 7m24.077766576s)
the crash still happens on HEAD
commit msg: Linux 4.14.172
crash: WARNING in ovl_create_or_link
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
bond0: Enslaving bond_slave_0 as an active interface with an up link
------------[ cut here ]------------
audit: type=1804 audit(1583035527.410:41): pid=6820 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir199142823/syzkaller.VL41tQ/0/file0/file0" dev="sda1" ino=16526 res=1
WARNING: CPU: 1 PID: 6820 at fs/overlayfs/dir.c:523 ovl_create_or_link+0x545/0x13b0 fs/overlayfs/dir.c:523
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6820 Comm: syz-executor.4 Not tainted 4.14.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.8+0x25/0x2c kernel/panic.c:547
 report_bug+0x1a4/0x1f3 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
bond0: Enslaving bond_slave_1 as an active interface with an up link
IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:ovl_create_or_link+0x545/0x13b0 fs/overlayfs/dir.c:523
RSP: 0018:ffff88808819fb00 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff888087aa53f0 RCX: ffff888087aab544
RDX: 1ffff11010f54a7f RSI: ffff888096b3cf20 RDI: ffff888087aa53f8
RBP: ffff88808819fcb8 R08: ffff888096b3cf40 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11011033f6e R15: ffff888095494350
team0: Port device team_slave_0 added
IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready
team0: Port device team_slave_1 added
 ovl_link+0x151/0x19d fs/overlayfs/dir.c:614
 vfs_link+0x646/0xa10 fs/namei.c:4264
 SYSC_linkat fs/namei.c:4332 [inline]
 SyS_linkat fs/namei.c:4288 [inline]
 SYSC_link fs/namei.c:4355 [inline]
 SyS_link+0x2f8/0x4b0 fs/namei.c:4353
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4597c9
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
RSP: 002b:00007f5c9e569c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004597c9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000140
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5c9e56a6d4
R13: 00000000004f53e2 R14: 00000000004d9f08 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..