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BUG: KASAN: user-memory-access in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
BUG: KASAN: user-memory-access in atomic_fetch_add_unless include/linux/atomic.h:575 [inline]
BUG: KASAN: user-memory-access in atomic_add_unless include/linux/atomic.h:597 [inline]
BUG: KASAN: user-memory-access in dst_hold_safe include/net/dst.h:308 [inline]
BUG: KASAN: user-memory-access in ip6_hold_safe+0xa7/0x3a0 net/ipv6/route.c:1023
Read of size 4 at addr 00000000000016e4 by task syz-executor.5/3023

CPU: 1 PID: 3023 Comm: syz-executor.5 Not tainted 5.0.0+ #7
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
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x123/0x190 mm/kasan/generic.c:191
 kasan_check_read+0x11/0x20 mm/kasan/common.c:100
 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
 atomic_fetch_add_unless include/linux/atomic.h:575 [inline]
 atomic_add_unless include/linux/atomic.h:597 [inline]
 dst_hold_safe include/net/dst.h:308 [inline]
 ip6_hold_safe+0xa7/0x3a0 net/ipv6/route.c:1023
 rt6_get_pcpu_route net/ipv6/route.c:1243 [inline]
 ip6_pol_route+0x33d/0xf00 net/ipv6/route.c:1904
 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2080
 fib6_rule_lookup+0x128/0x560 net/ipv6/fib6_rules.c:118
 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2109
 ip6_dst_lookup_tail+0x1124/0x1b30 net/ipv6/ip6_output.c:991
 ip6_dst_lookup+0x4d/0x70 net/ipv6/ip6_output.c:1071
 addr6_resolve+0x22f/0x470 drivers/infiniband/core/addr.c:430
 addr_resolve+0x2ce/0x1730 drivers/infiniband/core/addr.c:588
 rdma_resolve_ip+0x400/0x6a0 drivers/infiniband/core/addr.c:697
 rdma_resolve_addr+0x24c/0x2200 drivers/infiniband/core/cma.c:3104
 ucma_resolve_ip+0x153/0x210 drivers/infiniband/core/ucma.c:715
 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689
 __vfs_write+0x116/0x8e0 fs/read_write.c:485
 vfs_write+0x20c/0x580 fs/read_write.c:549
 ksys_write+0xea/0x1f0 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __ia32_sys_write+0x71/0xb0 fs/read_write.c:607
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fef869
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5deb0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00000000200002c0
RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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