======================================
| xx__-> [ 1455.263644][T19412] ==================================================================
| [ 1455.263900][T19412] BUG: KASAN: slab-out-of-bounds in tcp_v6_send_response (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/net/inet_sock.h:411 net/ipv6/tcp_ipv6.c:983)
| [ 1455.264105][T19412] Read of size 8 at addr ff11000009764a50 by task packetdrill/19412
| [ 1455.264296][T19412]
[ 1455.264367][T19412] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1455.264369][T19412] Call Trace:
[ 1455.264371][T19412]  <TASK>
[ 1455.264372][T19412]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 1455.264377][T19412]  print_address_description.constprop.0 (mm/kasan/report.c:378)
[ 1455.264381][T19412]  print_report (mm/kasan/report.c:482)
[ 1455.264383][T19412]  ? __virt_addr_valid (./include/linux/rcupdate.h:948 ./include/linux/mmzone.h:2276 arch/x86/mm/physaddr.c:54)
[ 1455.264385][T19412]  ? __virt_addr_valid (./include/linux/rcupdate.h:974 (discriminator 1) ./include/linux/mmzone.h:2286 (discriminator 1) arch/x86/mm/physaddr.c:54 (discriminator 1))
[ 1455.264387][T19412]  kasan_report (mm/kasan/report.c:595)
[ 1455.264390][T19412]  ? tcp_v6_send_response (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/net/inet_sock.h:411 net/ipv6/tcp_ipv6.c:983)
[ 1455.264392][T19412]  ? tcp_v6_send_response (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/net/inet_sock.h:411 net/ipv6/tcp_ipv6.c:983)
[ 1455.264394][T19412]  kasan_check_range (mm/kasan/generic.c:186 mm/kasan/generic.c:200)
[ 1455.264396][T19412]  tcp_v6_send_response (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/net/inet_sock.h:411 net/ipv6/tcp_ipv6.c:983)
[ 1455.264397][T19412]  ? __mod_timer (kernel/time/timer.c:803 kernel/time/timer.c:848 kernel/time/timer.c:1025)
[ 1455.264401][T19412]  ? __xfrm_policy_check2.constprop.0 (net/ipv4/ip_input.c:414 (discriminator 5))
[ 1455.264403][T19412]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[ 1455.264407][T19412]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[ 1455.264408][T19412]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[ 1455.264412][T19412]  tcp_v6_rcv (net/ipv6/tcp_ipv6.c:1149 net/ipv6/tcp_ipv6.c:1201 net/ipv6/tcp_ipv6.c:1993)
[ 1455.264415][T19412]  ? tcp_v6_syn_recv_sock (./include/linux/skbuff.h:1141 ./include/net/sock.h:1602 ./include/net/sock.h:2498 net/ipv6/tcp_ipv6.c:1526)
[ 1455.264417][T19412]  ? mark_usage (kernel/locking/lockdep.c:4690)
[ 1455.264420][T19412]  ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479)
[ 1455.264424][T19412]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[ 1455.264426][T19412]  ip6_input (net/ipv6/ip6_input.c:534 ./include/linux/netfilter.h:429 net/ipv6/ip6_input.c:545)
[ 1455.264427][T19412]  __netif_receive_skb_one_core (net/core/dev.c:6264)
[ 1455.264431][T19412]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[ 1455.264433][T19412]  ? netif_receive_skb_internal (./include/linux/rcupdate.h:309 (discriminator 2) ./include/linux/rcupdate.h:849 (discriminator 2) net/core/dev.c:6450 (discriminator 2))
[ 1455.264435][T19412]  ? __netif_receive_skb_list_core (net/core/dev.c:6310)
[ 1455.264437][T19412]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[ 1455.264438][T19412]  ? ktime_get_with_offset (./include/linux/seqlock.h:75 (discriminator 6) kernel/time/timekeeping.c:1046 (discriminator 6))
[ 1455.264441][T19412]  netif_receive_skb_internal (net/core/dev.c:6463)
[ 1455.264443][T19412]  ? __netif_receive_skb (./include/linux/skbuff.h:1141)
[ 1455.264444][T19412]  ? __might_fault (mm/memory.c:7482 (discriminator 5))
[ 1455.264448][T19412]  ? _copy_from_iter (./include/linux/instrumented.h:146 lib/iov_iter.c:66 ./include/linux/iov_iter.h:52 ./include/linux/iov_iter.h:304 ./include/linux/iov_iter.h:330 lib/iov_iter.c:261 lib/iov_iter.c:272)
[ 1455.264452][T19412]  netif_receive_skb (net/core/dev.c:6522)
[ 1455.264454][T19412]  ? __local_bh_disable_ip (./include/linux/ftrace.h:1177 kernel/softirq.c:418)
[ 1455.264456][T19412]  tun_rx_batched.isra.0 (drivers/net/tun.c:1595)
[ 1455.264459][T19412]  ? mark_usage (kernel/locking/lockdep.c:4690)
[ 1455.264461][T19412]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[ 1455.264463][T19412]  ? tun_setup (drivers/net/tun.c:2410)
[ 1455.264465][T19412]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[ 1455.264466][T19412]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[ 1455.264468][T19412]  tun_get_user (drivers/net/tun.c:2045)
[ 1455.264471][T19412]  ? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
[ 1455.264474][T19412]  ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[ 1455.264476][T19412]  ? tun_build_skb (./arch/x86/include/asm/atomic.h:23)
[ 1455.264478][T19412]  ? mark_usage (kernel/locking/lockdep.c:4690)
[ 1455.264480][T19412]  ? ref_tracker_free (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:455 ./include/linux/refcount.h:476 lib/ref_tracker.c:298)
[ 1455.264482][T19412]  ? ref_tracker_dir_print (lib/ref_tracker.c:200)
[ 1455.264485][T19412]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[ 1455.264487][T19412]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[ 1455.264489][T19412]  ? tun_get (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) drivers/net/tun.c:831 (discriminator 2))
[ 1455.264491][T19412]  tun_chr_write_iter (drivers/net/tun.c:2091)
[ 1455.264493][T19412]  do_iter_readv_writev (fs/read_write.c:828)
[ 1455.264495][T19412]  ? kasan_quarantine_put (mm/kasan/quarantine.c:234 (discriminator 6))
[ 1455.264496][T19412]  ? fsnotify (fs/notify/fsnotify.c:548 (discriminator 3))
[ 1455.264499][T19412]  ? ref_tracker_free (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:455 ./include/linux/refcount.h:476 lib/ref_tracker.c:298)
[ 1455.264501][T19412]  ? new_sync_write (./include/linux/ioprio.h:41)
[ 1455.264504][T19412]  ? import_iovec (lib/iov_iter.c:1440 (discriminator 1))
[ 1455.264506][T19412]  vfs_writev (fs/read_write.c:1058)
[ 1455.264507][T19412]  ? tun_get (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) drivers/net/tun.c:831 (discriminator 2))
[ 1455.264509][T19412]  ? vfs_iocb_iter_write (fs/read_write.c:41)
[ 1455.264510][T19412]  ? tun_recvmsg (./include/linux/netdevice.h:4505 (discriminator 31))
[ 1455.264512][T19412]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[ 1455.264513][T19412]  ? new_sync_read (./include/linux/fs.h:2185 (discriminator 1) fs/read_write.c:489 (discriminator 1))
[ 1455.264516][T19412]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[ 1455.264517][T19412]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[ 1455.264520][T19412]  ? __fget_files (./include/linux/rcupdate.h:882 fs/file.c:1100)
[ 1455.264523][T19412]  ? do_writev (fs/read_write.c:1104)
[ 1455.264524][T19412]  do_writev (fs/read_write.c:1104)
[ 1455.264526][T19412]  ? vfs_writev (fs/read_write.c:41)
[ 1455.264527][T19412]  ? fput (./include/linux/preempt.h:500 ./include/linux/file_ref.h:150 fs/file_table.c:588)
[ 1455.264529][T19412]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[ 1455.264531][T19412]  do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
[ 1455.264532][T19412]  ? irq_exit_rcu (kernel/softirq.c:786)
[ 1455.264534][T19412]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[ 1455.264536][T19412] RIP: 0033:0x4c42a2
[ 1455.264538][T19412] Code: 08 0f 85 31 ea ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 55 48 89 e5
All code
========
   0:	08 0f                	or     %cl,(%rdi)
   2:	85 31                	test   %esi,(%rcx)
   4:	ea                   	(bad)
   5:	ff                   	(bad)
   6:	ff 49 89             	decl   -0x77(%rcx)
   9:	fb                   	sti
   a:	48 89 f0             	mov    %rsi,%rax
   d:	48 89 d7             	mov    %rdx,%rdi
  10:	48 89 ce             	mov    %rcx,%rsi
  13:	4c 89 c2             	mov    %r8,%rdx
  16:	4d 89 ca             	mov    %r9,%r10
  19:	4c 8b 44 24 08       	mov    0x8(%rsp),%r8
  1e:	4c 8b 4c 24 10       	mov    0x10(%rsp),%r9
  23:	4c 89 5c 24 08       	mov    %r11,0x8(%rsp)
  28:	0f 05                	syscall
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  32:	00 00 00 
  35:	0f 1f 00             	nopl   (%rax)
  38:	f3 0f 1e fa          	endbr64
  3c:	55                   	push   %rbp
  3d:	48 89 e5             	mov    %rsp,%rbp

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   8:	00 00 00 
   b:	0f 1f 00             	nopl   (%rax)
   e:	f3 0f 1e fa          	endbr64
  12:	55                   	push   %rbp
  13:	48 89 e5             	mov    %rsp,%rbp
[ 1455.264540][T19412] RSP: 002b:00007fff00dfba38 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
[ 1455.264544][T19412] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00000000004c42a2
[ 1455.264545][T19412] RDX: 0000000000000002 RSI: 00007fff00dfbac0 RDI: 0000000000000005
[ 1455.264546][T19412] RBP: 00007fff00dfba60 R08: 0000000000000000 R09: 0000000000000000
[ 1455.264547][T19412] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff00dfc098


Finger prints:
print_report:kasan_report:kasan_check_range:tcp_v6_send_response:tcp_v6_rcv