syzbot


UBSAN: undefined-behaviour in maybe_deliver

Status: upstream: reported C repro on 2020/09/24 09:55
Reported-by: syzbot+8ee42b5f2c98ccd97a25@syzkaller.appspotmail.com
First crash: 1540d, last: 1524d
Fix bisection: failed (error log, bisect log)
  

Sample crash report:
================================================================================
UBSAN: Undefined behaviour in net/bridge/br_private.h:586:29
load of value 5 is not a valid value for type '_Bool'
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
 __ubsan_handle_load_invalid_value.cold+0x63/0x6f lib/ubsan.c:454
 br_skb_isolated net/bridge/br_private.h:586 [inline]
 should_deliver net/bridge/br_forward.c:34 [inline]
 maybe_deliver.cold+0x15/0x34 net/bridge/br_forward.c:178
 br_flood+0x180/0x4f0 net/bridge/br_forward.c:226
 br_dev_xmit+0xdd0/0x1510 net/bridge/br_device.c:103
 __netdev_start_xmit include/linux/netdevice.h:4333 [inline]
 netdev_start_xmit include/linux/netdevice.h:4347 [inline]
 xmit_one net/core/dev.c:3256 [inline]
 dev_hard_start_xmit+0x1a8/0x960 net/core/dev.c:3272
 __dev_queue_xmit+0x276a/0x2ec0 net/core/dev.c:3838
 mrp_queue_xmit net/802/mrp.c:354 [inline]
 mrp_join_timer+0x8a/0xc0 net/802/mrp.c:598
 call_timer_fn+0x177/0x760 kernel/time/timer.c:1338
 expire_timers+0x243/0x500 kernel/time/timer.c:1375
 __run_timers kernel/time/timer.c:1703 [inline]
 run_timer_softirq+0x259/0x730 kernel/time/timer.c:1716
 __do_softirq+0x27d/0xad2 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x22d/0x270 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:544 [inline]
 smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: e9 73 fd ff ff 48 89 df e8 1f 82 fc f9 e9 59 ff ff ff 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d a4 d8 59 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 94 d8 59 00 f4 c3 90 90 41 56 41 55
RSP: 0018:ffffffff89407d40 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c7138 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff89481284
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff896389b0
R13: 1ffffffff1280fb2 R14: 0000000000000000 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 default_idle+0x49/0x320 arch/x86/kernel/process.c:557
 cpuidle_idle_call kernel/sched/idle.c:153 [inline]
 do_idle+0x2f8/0x500 kernel/sched/idle.c:263
 cpu_startup_entry+0xc5/0xd6 kernel/sched/idle.c:369
 start_kernel+0x93d/0x978 init/main.c:736
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
================================================================================
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
8021q: VLANs not supported on ipvlan0
8021q: VLANs not supported on ipvlan0
8021q: VLANs not supported on ipvlan0
8021q: VLANs not supported on ipvlan0
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!
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!
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!
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!
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!
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!
8021q: VLANs not supported on ipvlan1
8021q: VLANs not supported on ipvlan1
8021q: VLANs not supported on ipvlan0
8021q: VLANs not supported on ipvlan0
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!
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!
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!
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!
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!
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!
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!
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!
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!
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!
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!
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!

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/24 09:54 linux-4.19.y d09b80172c22 54289b08 .config console log report syz C ci2-linux-4-19
2020/10/10 17:14 linux-4.19.y a1b977b49b66 b74c49a6 .config console log report info ci2-linux-4-19
2020/10/04 15:05 linux-4.19.y b09c34517e1a 5ef9c291 .config console log report info ci2-linux-4-19
2020/10/02 19:22 linux-4.19.y b09c34517e1a 062c9832 .config console log report info ci2-linux-4-19
2020/10/01 04:16 linux-4.19.y 10ad6cfd5736 a9767fb2 .config console log report info ci2-linux-4-19
2020/09/29 06:38 linux-4.19.y 10ad6cfd5736 1b88c6d5 .config console log report info ci2-linux-4-19
2020/09/28 13:39 linux-4.19.y 10ad6cfd5736 6bfdbe89 .config console log report info ci2-linux-4-19
2020/09/28 03:39 linux-4.19.y 10ad6cfd5736 5dd8aee8 .config console log report info ci2-linux-4-19
2020/09/26 19:33 linux-4.19.y 10ad6cfd5736 2d5ea0cb .config console log report info ci2-linux-4-19
2020/09/26 18:07 linux-4.19.y 10ad6cfd5736 2d5ea0cb .config console log report info ci2-linux-4-19
* Struck through repros no longer work on HEAD.