bisecting fixing commit since 775d01b65b5daa002a9ba60f2d2bb3b1a6ce12fb
building syzkaller on cdac920beb540736200639a6254e6dc01422e705
testing commit 775d01b65b5daa002a9ba60f2d2bb3b1a6ce12fb with gcc (GCC) 8.1.0
kernel signature: 8c8ad93594f59fbe30d6321f491c0d420ae0d22f
all runs: crashed: WARNING in reconnect_path
testing current HEAD a844dc4c544291470aa69edbe2434b040794e269
testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0
kernel signature: c7b2e316a1031c004b34e48b355ae6075076bc38
all runs: crashed: WARNING in reconnect_path
revisions tested: 2, total time: 22m56.843648989s (build: 16m0.897360625s, test: 6m18.012961413s)
the crash still happens on HEAD
commit msg: Linux 4.14.158
crash: WARNING in reconnect_path
kobject: 'veth1_to_hsr' (ffff88809fcd4ff0): kobject_add_internal: parent: 'net', set: 'devices'
R13: 00000000004c731d R14: 00000000004dcd30 R15: 0000000000000003
kobject: 'veth1_to_hsr' (ffff88809fcd4ff0): kobject_uevent_env
------------[ cut here ]------------
kobject: 'veth1_to_hsr' (ffff88809fcd4ff0): fill_kobj_path: path = '/devices/virtual/net/veth1_to_hsr'
WARNING: CPU: 0 PID: 6805 at fs/exportfs/expfs.c:96 dget include/linux/dcache.h:325 [inline]
WARNING: CPU: 0 PID: 6805 at fs/exportfs/expfs.c:96 clear_disconnected fs/exportfs/expfs.c:92 [inline]
WARNING: CPU: 0 PID: 6805 at fs/exportfs/expfs.c:96 reconnect_path+0x3d2/0x570 fs/exportfs/expfs.c:232
kobject: 'queues' (ffff88808fdb6648): kobject_add_internal: parent: 'veth1_to_hsr', set: '<NULL>'
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6805 Comm: syz-executor.1 Not tainted 4.14.158-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: 'queues' (ffff88808fdb6648): kobject_uevent_env
 __warn.cold.8+0x25/0x2c kernel/panic.c:547
 report_bug+0x1a4/0x1f3 lib/bug.c:186
kobject: 'queues' (ffff88808fdb6648): kobject_uevent_env: filter function caused the event to drop!
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
kobject: 'rx-0' (ffff8880a9766250): 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
RIP: 0010:clear_disconnected fs/exportfs/expfs.c:96 [inline]
RIP: 0010:reconnect_path+0x3d2/0x570 fs/exportfs/expfs.c:232
RSP: 0018:ffff88807e7cfbf8 EFLAGS: 00010246
RAX: 1ffff1101548c710 RBX: ffff8880aa463840 RCX: 1ffff110151e6d4e
RDX: 1ffff1101548c710 RSI: 0000000000000001 RDI: ffff8880aa463880
RBP: ffff88807e7cfc48 R08: 0000000000000001 R09: 0000000000000000
kobject: 'rx-0' (ffff8880a9766250): kobject_uevent_env
R10: 0000000000000028 R11: ffff8880a8f36200 R12: ffff8880aa463840
R13: dffffc0000000000 R14: ffffed1014233005 R15: ffff8880aa463840
 exportfs_decode_fh+0x1d5/0x619 fs/exportfs/expfs.c:448
kobject: 'rx-0' (ffff8880a9766250): fill_kobj_path: path = '/devices/virtual/net/veth1_to_hsr/queues/rx-0'
kobject: 'tx-0' (ffff88808f56dcd8): kobject_add_internal: parent: 'queues', set: 'queues'
 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: 'tx-0' (ffff88808f56dcd8): kobject_uevent_env
kobject: 'tx-0' (ffff88808f56dcd8): fill_kobj_path: path = '/devices/virtual/net/veth1_to_hsr/queues/tx-0'
kobject: 'batman_adv' (ffff88808e1ddc00): kobject_add_internal: parent: 'veth1_to_hsr', set: '<NULL>'
kobject: 'hsr_slave_1' (ffff888082c20c70): kobject_add_internal: parent: 'net', set: 'devices'
 SYSC_open_by_handle_at fs/fhandle.c:266 [inline]
 SyS_open_by_handle_at+0xc/0x10 fs/fhandle.c:257
kobject: 'hsr_slave_1' (ffff888082c20c70): kobject_uevent_env
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a669
RSP: 002b:00007fe68a3a6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007fe68a3a6c90 RCX: 000000000045a669
kobject: 'hsr_slave_1' (ffff888082c20c70): fill_kobj_path: path = '/devices/virtual/net/hsr_slave_1'
RDX: 0000000000400000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe68a3a76d4
R13: 00000000004c731d R14: 00000000004dcd30 R15: 0000000000000003
Kernel Offset: disabled
Rebooting in 86400 seconds..