bisecting fixing commit since 9fa690a2a016e1b55356835f047b952e67d3d73a
building syzkaller on 5ed23f9aa677d71bc60f61df8e05046151868541
testing commit 9fa690a2a016e1b55356835f047b952e67d3d73a with gcc (GCC) 8.1.0
kernel signature: 4173bb86bddb8efe5656b8d21e4494177d3779bc3783fca984ba69117debb36f
run #0: crashed: general protection fault in prepare_to_wait
run #1: crashed: general protection fault in prepare_to_wait
run #2: crashed: general protection fault in prepare_to_wait
run #3: crashed: general protection fault in prepare_to_wait
run #4: crashed: general protection fault in prepare_to_wait
run #5: crashed: general protection fault in prepare_to_wait
run #6: crashed: general protection fault in prepare_to_wait
run #7: OK
run #8: OK
run #9: OK
testing current HEAD 050272a0423e68207fd2367831ae610680129062
testing commit 050272a0423e68207fd2367831ae610680129062 with gcc (GCC) 8.1.0
kernel signature: e1930035aa3ad687be80d067d845c0acf7d3c01332a1748ab253eb1a19a23865
run #0: crashed: general protection fault in prepare_to_wait
run #1: crashed: general protection fault in prepare_to_wait
run #2: crashed: general protection fault in prepare_to_wait
run #3: crashed: general protection fault in prepare_to_wait
run #4: crashed: general protection fault in prepare_to_wait
run #5: crashed: general protection fault in prepare_to_wait
run #6: crashed: general protection fault in prepare_to_wait
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 38m34.626009766s (build: 17m32.650282687s, test: 20m1.897552892s)
the crash still happens on HEAD
commit msg: Linux 4.14.177
crash: general protection fault in prepare_to_wait
device veth1_vlan entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Modules linked in:
CPU: 0 PID: 7675 Comm: syz-executor.5 Not tainted 4.14.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
task: ffff88808a5780c0 task.stack: ffff88808abe0000
RIP: 0010:__lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3369
RSP: 0018:ffff88808abe78f0 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff87f16700
RBP: ffff88808abe7ac0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: ffff88808a5780c0 R12: 0000000000000018
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
FS:  00007f06514bc700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff21bc9d1c CR3: 000000008ae6b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
batman_adv: batadv0: Interface activated: batadv_slave_0
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 lock_acquire+0x173/0x400 kernel/locking/lockdep.c:3998
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:160
 prepare_to_wait+0x8a/0x3b0 kernel/sched/wait.c:234
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 nr_accept+0x1a8/0x670 net/netrom/af_netrom.c:796
 SYSC_accept4+0x306/0x5e0 net/socket.c:1587
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
 SyS_accept4 net/socket.c:1537 [inline]
 SYSC_accept net/socket.c:1621 [inline]
 SyS_accept+0xb/0x10 net/socket.c:1618
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b349
IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready
RSP: 002b:00007f06514bbc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: ffffffffffffffda RBX: 00007f06514bc6d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000000 R14: 00000000004c1558 R15: 000000000075bfd4
Code: 00 00 00 00 8b 84 24 98 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d 
IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready
c3 48 b8 00 00 00 00 00 fc ff 
device veth0_macvtap entered promiscuous mode
df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 30 00 00 49 81 3c 24 e0 e4 e7 88 0f 84 30 
RIP: __lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3369 RSP: ffff88808abe78f0
---[ end trace d3a00c82cf488902 ]---
IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready