bisecting fixing commit since 775d01b65b5daa002a9ba60f2d2bb3b1a6ce12fb
building syzkaller on cdac920beb540736200639a6254e6dc01422e705
testing commit 775d01b65b5daa002a9ba60f2d2bb3b1a6ce12fb with gcc (GCC) 8.1.0
kernel signature: 087859eccd65f4b8a1d17bf54aa2ab1a0da35fed
all runs: crashed: WARNING in reconnect_path
testing current HEAD c04fc6fa5c96ec57316527b2228fa31f26494abe
testing commit c04fc6fa5c96ec57316527b2228fa31f26494abe with gcc (GCC) 8.1.0
kernel signature: 39078e2a5a261587848e8ce680e5bc8e64e37957
all runs: crashed: WARNING in reconnect_path
revisions tested: 2, total time: 25m23.137767671s (build: 17m19.43048613s, test: 7m9.478281507s)
the crash still happens on HEAD
commit msg: Linux 4.14.165
crash: WARNING in reconnect_path
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5b196626d4
R13: 00000000004c731d R14: 00000000004dcd30 R15: 0000000000000003
------------[ cut here ]------------
kobject: 'queues' (ffff8880a88d6848): kobject_uevent_env: filter function caused the event to drop!
WARNING: CPU: 1 PID: 7042 at fs/exportfs/expfs.c:96 dget include/linux/dcache.h:325 [inline]
WARNING: CPU: 1 PID: 7042 at fs/exportfs/expfs.c:96 clear_disconnected fs/exportfs/expfs.c:92 [inline]
WARNING: CPU: 1 PID: 7042 at fs/exportfs/expfs.c:96 reconnect_path+0x3d2/0x570 fs/exportfs/expfs.c:232
kobject: 'rx-0' (ffff8880a8f0f6d0): kobject_add_internal: parent: 'queues', set: 'queues'
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7042 Comm: syz-executor.5 Not tainted 4.14.165-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
kobject: 'rx-0' (ffff8880a8f0f6d0): kobject_uevent_env
 __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
kobject: 'rx-0' (ffff8880a8f0f6d0): fill_kobj_path: path = '/devices/virtual/net/veth0_to_hsr/queues/rx-0'
kobject: 'tx-0' (ffff8880a9a315d8): kobject_add_internal: parent: 'queues', set: 'queues'
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
kobject: 'tx-0' (ffff8880a9a315d8): kobject_uevent_env
RIP: 0010:clear_disconnected fs/exportfs/expfs.c:96 [inline]
RIP: 0010:reconnect_path+0x3d2/0x570 fs/exportfs/expfs.c:232
kobject: 'tx-0' (ffff8880a9a315d8): fill_kobj_path: path = '/devices/virtual/net/veth0_to_hsr/queues/tx-0'
RSP: 0018:ffff888094bc7bf8 EFLAGS: 00010246
RAX: 1ffff110148a3870 RBX: ffff8880a451c340 RCX: 1ffff1101143958e
RDX: 1ffff110148a3870 RSI: 0000000000000001 RDI: ffff8880a451c380
RBP: ffff888094bc7c48 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000028 R11: ffff88808a1ca400 R12: ffff8880a451c340
R13: dffffc0000000000 R14: ffffed1012674345 R15: ffff8880a451c340
 exportfs_decode_fh+0x1d5/0x6e8 fs/exportfs/expfs.c:448
kobject: 'batman_adv' (ffff888092e0e280): kobject_add_internal: parent: 'veth0_to_hsr', set: '<NULL>'
kobject: 'hsr_slave_0' (ffff88808a82ca30): kobject_add_internal: parent: 'net', set: 'devices'
 do_handle_to_path fs/fhandle.c:153 [inline]
 handle_to_path fs/fhandle.c:208 [inline]
 do_handle_open+0x25e/0x5b0 fs/fhandle.c:224
kobject: 'hsr_slave_0' (ffff88808a82ca30): kobject_uevent_env
kobject: 'hsr_slave_0' (ffff88808a82ca30): fill_kobj_path: path = '/devices/virtual/net/hsr_slave_0'
 SYSC_open_by_handle_at fs/fhandle.c:266 [inline]
 SyS_open_by_handle_at+0xc/0x10 fs/fhandle.c:257
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a669
RSP: 002b:00007f5b19661c78 EFLAGS: 00000246
kobject: 'queues' (ffff8880a88d6448): kobject_add_internal: parent: 'hsr_slave_0', set: '<NULL>'
 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007f5b19661c90 RCX: 000000000045a669
RDX: 0000000000400000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5b196626d4
R13: 00000000004c731d R14: 00000000004dcd30 R15: 0000000000000003
Kernel Offset: disabled
Rebooting in 86400 seconds..