================================================================== BUG: KASAN: user-memory-access in fib6_drop_pcpu_from net/ipv6/ip6_fib.c:925 [inline] BUG: KASAN: user-memory-access in fib6_purge_rt+0x1b3/0x5e0 net/ipv6/ip6_fib.c:937 Write of size 8 at addr 0000000000007c78 by task syz-executor.3/30135 CPU: 0 PID: 30135 Comm: syz-executor.3 Not tainted 5.2.0-rc2+ #36 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+0x172/0x1f0 lib/dump_stack.c:113 __kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 kasan_report+0x12/0x20 mm/kasan/common.c:614 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_write+0x14/0x20 mm/kasan/common.c:100 fib6_drop_pcpu_from net/ipv6/ip6_fib.c:925 [inline] fib6_purge_rt+0x1b3/0x5e0 net/ipv6/ip6_fib.c:937 fib6_del_route net/ipv6/ip6_fib.c:1812 [inline] fib6_del+0xac2/0x10a0 net/ipv6/ip6_fib.c:1843 fib6_clean_node+0x3a5/0x590 net/ipv6/ip6_fib.c:2005 fib6_walk_continue+0x4a9/0x8e0 net/ipv6/ip6_fib.c:1927 fib6_walk+0x9d/0x100 net/ipv6/ip6_fib.c:1975 fib6_clean_tree+0xe0/0x120 net/ipv6/ip6_fib.c:2054 __fib6_clean_all+0x118/0x2a0 net/ipv6/ip6_fib.c:2070 fib6_clean_all+0x2b/0x40 net/ipv6/ip6_fib.c:2081 rt6_sync_down_dev+0x134/0x150 net/ipv6/route.c:4169 rt6_disable_ip+0x27/0x5f0 net/ipv6/route.c:4174 addrconf_ifdown+0xa2/0x1220 net/ipv6/addrconf.c:3709 addrconf_notify+0x5db/0x2270 net/ipv6/addrconf.c:3634 notifier_call_chain+0xc2/0x230 kernel/notifier.c:95 __raw_notifier_call_chain kernel/notifier.c:396 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:403 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1753 call_netdevice_notifiers_extack net/core/dev.c:1765 [inline] call_netdevice_notifiers net/core/dev.c:1779 [inline] __dev_notify_flags+0x1e9/0x2c0 net/core/dev.c:7594 dev_change_flags+0x10d/0x170 net/core/dev.c:7630 devinet_ioctl+0x138a/0x1c50 net/ipv4/devinet.c:1104 inet_ioctl+0x1f4/0x340 net/ipv4/af_inet.c:952 sock_do_ioctl+0xd8/0x2f0 net/socket.c:1049 sock_ioctl+0x3ed/0x780 net/socket.c:1200 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f71129a0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 0000000020000040 RSI: 0000000000008914 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f71129a16d4 R13: 00000000004c4c76 R14: 00000000004d89b8 R15: 00000000ffffffff ==================================================================