bisecting fixing commit since b19ffe6e7205c0b0d26b750673873f3f9f61da35
building syzkaller on aff9e255cd708709adef545d1f932020ee5c0978
testing commit b19ffe6e7205c0b0d26b750673873f3f9f61da35 with gcc (GCC) 8.1.0
kernel signature: 0619bc49f4ded20bb30b1e3fcf60fbbe0347792782e69a94692385a65107e568
all runs: crashed: general protection fault in rose_send_frame
testing current HEAD 050272a0423e68207fd2367831ae610680129062
testing commit 050272a0423e68207fd2367831ae610680129062 with gcc (GCC) 8.1.0
kernel signature: 53f01acc3431299961a0f3ab1e285c8d9198cf8b46d66f769171f019ff86d158
all runs: crashed: general protection fault in rose_send_frame
revisions tested: 2, total time: 24m10.093617291s (build: 17m22.211470501s, test: 6m0.551037364s)
the crash still happens on HEAD
commit msg: Linux 4.14.177
crash: general protection fault in rose_send_frame
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
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
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff87876240 task.stack: ffffffff87800000
RIP: 0010:rose_send_frame+0x140/0x240 net/rose/rose_link.c:104
RSP: 0018:ffff8880aee07b40 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809b72b800 RCX: 0000000000000006
RDX: 000000000000006b RSI: ffffffff87191cc0 RDI: 0000000000000358
RBP: ffff8880aee07b70 R08: ffffed10119f2765 R09: 0000000000000000
R10: ffffed10119f2764 R11: ffff88808cf93b23 R12: ffff88809b72b800
R13: 0000000000000078 R14: ffff888090511e40 R15: ffff888090511e40
FS:  0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056253bf2f480 CR3: 0000000097881000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rose_transmit_clear_request+0x1d0/0x290 net/rose/rose_link.c:258
 rose_rx_call_request+0x395/0x1d4b net/rose/af_rose.c:1000
 rose_loopback_timer+0x11f/0x430 net/rose/rose_loopback.c:103
 call_timer_fn+0x142/0x570 kernel/time/timer.c:1279
 expire_timers kernel/time/timer.c:1318 [inline]
 __run_timers kernel/time/timer.c:1636 [inline]
 run_timer_softirq+0xc99/0x1210 kernel/time/timer.c:1649
 __do_softirq+0x246/0x9b0 kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x15f/0x1a0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x149/0x5d0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffffffff87807db8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: ffffffff87876240 RCX: 0000000000000000
RDX: 1ffffffff0f22d34 RSI: 0000000000000001 RDI: ffffffff879169a0
RBP: ffffffff87807db8 R08: 1ffffffff108ac01 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87916990
R13: ffffffff88457f60 R14: 0000000000000000 R15: ffffffff87916980
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 default_idle+0x4f/0x370 arch/x86/kernel/process.c:566
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:557
 default_idle_call+0x6d/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x311/0x3d0 kernel/sched/idle.c:246
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
 rest_init+0x193/0x199 init/main.c:434
 start_kernel+0x61d/0x642 init/main.c:708
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399
 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:380
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
Code: 5d 41 5e 5d c3 80 3c 02 00 0f 85 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 4b 20 49 8d b9 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d1 00 00 00 49 8b 91 58 03 00 00 e9 04 ff ff 
RIP: rose_send_frame+0x140/0x240 net/rose/rose_link.c:104 RSP: ffff8880aee07b40
---[ end trace 3d0afc3f7aa33ae8 ]---