bisecting fixing commit since cb1f9a169a0e197f93816ace48a6520e8640809d
building syzkaller on 4c04afaa19a16e90d8b495cc3795fd4ed21df4df
testing commit cb1f9a169a0e197f93816ace48a6520e8640809d with gcc (GCC) 8.1.0
kernel signature: 4c9760a75f2a9331a09faf87287e3220f8a960f2be82f62e801c8a3ddbb4b74f
run #0: crashed: WARNING in ovl_real_fdget_meta
run #1: crashed: WARNING in corrupted
run #2: crashed: WARNING in corrupted
run #3: crashed: WARNING in corrupted
run #4: crashed: WARNING in ovl_real_fdget_meta
run #5: crashed: WARNING in ovl_real_fdget_meta
run #6: crashed: WARNING in ovl_real_fdget_meta
run #7: crashed: WARNING in ovl_real_fdget_meta
run #8: crashed: WARNING in ovl_real_fdget_meta
run #9: crashed: WARNING in ovl_real_fdget_meta
testing current HEAD 20b3a3dfdf6c55b50bbdc8e231a3dbf6bf965dc7
testing commit 20b3a3dfdf6c55b50bbdc8e231a3dbf6bf965dc7 with gcc (GCC) 8.1.0
kernel signature: 7e73cbe71f68495893bc1fb809a7bd8de5cb995567da21ef869f047a63e51880
run #0: crashed: WARNING in ovl_real_fdget_meta
run #1: crashed: WARNING in ovl_real_fdget_meta
run #2: crashed: WARNING in ovl_real_fdget_meta
run #3: crashed: WARNING in ovl_real_fdget_meta
run #4: crashed: WARNING in corrupted
run #5: crashed: WARNING in ovl_real_fdget_meta
run #6: crashed: WARNING in ovl_real_fdget_meta
run #7: crashed: WARNING in ovl_real_fdget_meta
run #8: crashed: WARNING in ovl_real_fdget_meta
run #9: crashed: WARNING in ovl_real_fdget_meta
revisions tested: 2, total time: 28m8.353481909s (build: 19m52.832671872s, test: 6m50.334210671s)
the crash still happens on HEAD
commit msg: Linux 4.19.134
crash: WARNING in ovl_real_fdget_meta
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7628 at fs/overlayfs/file.c:60 ovl_change_flags fs/overlayfs/file.c:60 [inline]
WARNING: CPU: 1 PID: 7628 at fs/overlayfs/file.c:60 ovl_real_fdget_meta.cold.10+0xc/0x18 fs/overlayfs/file.c:111
IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7628 Comm: syz-executor.0 Not tainted 4.19.134-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
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:ovl_change_flags fs/overlayfs/file.c:60 [inline]
RIP: 0010:ovl_real_fdget_meta.cold.10+0xc/0x18 fs/overlayfs/file.c:111
Code: ff e9 87 fe ff ff 4c 89 8d 70 ff ff ff e8 39 b6 50 ff 4c 8b 8d 70 ff ff ff e9 93 fe ff ff 48 c7 c7 60 e9 52 87 e8 d1 d3 0c ff <0f> 0b b8 fb ff ff ff e9 42 cd ff ff 48 c7 c7 60 e9 52 87 e8 b9 d3
RSP: 0018:ffff888085acfba0 EFLAGS: 00010286
RAX: 0000000000000024 RBX: ffff888085acfc10 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8767c340 RDI: ffffffff8a1a8aa0
RBP: ffff888085acfbd0 R08: ffffed1015d65079 R09: ffffed1015d65078
R10: ffffed1015d65078 R11: ffff8880aeb283c7 R12: 000000000000a000
R13: ffff8880a11dd800 R14: ffff8880a11dd878 R15: ffff888073c8b630
 ovl_real_fdget fs/overlayfs/file.c:118 [inline]
 ovl_read_iter+0xf4/0x2b3 fs/overlayfs/file.c:243
 call_read_iter include/linux/fs.h:1815 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x440/0x880 fs/read_write.c:418
 vfs_read+0xf5/0x2f0 fs/read_write.c:452
IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready
 ksys_read+0x103/0x260 fs/read_write.c:579
 __do_sys_read fs/read_write.c:589 [inline]
 __se_sys_read fs/read_write.c:587 [inline]
 __x64_sys_read+0x6e/0xb0 fs/read_write.c:587
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45afc9
Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fac21f30c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045afc9
RDX: 0000000000001000 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac21f316d4
IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready
R13: 00000000004c96cf R14: 00000000004e2260 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..