================================================================================ UBSAN: Undefined behaviour in net/bridge/br_private.h:586:29 load of value 4 is not a valid value for type '_Bool' CPU: 0 PID: 13580 Comm: syz-executor.2 Not tainted 4.19.150-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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 RIP: 0010:__do_page_fault+0x7ec/0xe00 arch/x86/mm/fault.c:1311 Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 41 05 00 00 48 83 3d 1e 7f 2f 08 00 0f 84 90 04 00 00 e8 7b c7 3d 00 fb 66 0f 1f 44 00 00 <48> 83 cd 04 c7 44 24 14 54 00 00 00 e9 6a fb ff ff e8 5e c7 3d 00 RSP: 0000:ffff8880a5fa7e78 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff88804cec6240 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81340ae5 RDI: ffff88804cec6ac4 RBP: 0000000000000007 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000007624ac R13: ffff8880a5fa7f58 R14: ffff888049a80780 R15: 0000000000000000 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0033:0x412b20 Code: 83 c3 01 e8 72 0d ff ff 39 dd 77 ee 48 8b 44 24 08 89 28 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 84 00 00 00 00 00 <89> 3c b5 00 00 76 00 eb 87 0f 1f 80 00 00 00 00 b8 00 00 00 80 48 RSP: 002b:00007ffd5a46e2b0 EFLAGS: 00010246 RAX: 000000007ecce92b RBX: 00000000aec9ddf4 RCX: 0000001b34820000 RDX: 0000000000000000 RSI: 000000000000092b RDI: ffffffff7ecce92b RBP: 000000000000000b R08: 000000007ecce92b R09: 000000007ecce92f R10: 00007ffd5a46e440 R11: 0000000000000246 R12: 000000000118bfa8 R13: 00007fb6a85dc008 R14: 00007fb6a85dc000 R15: 000000000000000b ================================================================================ SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2305 sclass=netlink_route_socket pid=13713 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2305 sclass=netlink_route_socket pid=13713 comm=syz-executor.0 ptrace attach of "/root/syz-executor.0"[6521] was attempted by " J   0 p \x07 @ " ptrace attach of "/root/syz-executor.0"[6521] was attempted by " J   0 p \x07 @ " netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'.