==================================================================
BUG: KCSAN: data-race in sctp_assoc_migrate / sctp_hash_obj

read to 0xffff8880a5999020 of 8 bytes by task 8135 on cpu 1:
 sctp_hash_obj+0x4f/0x2e0 net/sctp/input.c:900
 rht_key_get_hash include/linux/rhashtable.h:133 [inline]
 rht_key_hashfn include/linux/rhashtable.h:159 [inline]
 rht_head_hashfn include/linux/rhashtable.h:174 [inline]
 head_hashfn lib/rhashtable.c:41 [inline]
 rhashtable_rehash_one lib/rhashtable.c:245 [inline]
 rhashtable_rehash_chain lib/rhashtable.c:276 [inline]
 rhashtable_rehash_table lib/rhashtable.c:316 [inline]
 rht_deferred_worker+0x468/0xab0 lib/rhashtable.c:420
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff8880a5999020 of 8 bytes by task 19142 on cpu 0:
 sctp_assoc_migrate+0x1a6/0x290 net/sctp/associola.c:1091
 sctp_sock_migrate+0x959/0xa60 net/sctp/socket.c:9465
 sctp_accept+0x3c8/0x470 net/sctp/socket.c:4916
 inet_accept+0x7f/0x360 net/ipv4/af_inet.c:734
 __sys_accept4+0x224/0x430 net/socket.c:1754
 __do_sys_accept4 net/socket.c:1789 [inline]
 __se_sys_accept4 net/socket.c:1786 [inline]
 __x64_sys_accept4+0x5e/0x80 net/socket.c:1786
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19142 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 19142 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #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+0xf5/0x159 lib/dump_stack.c:113
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xe kernel/kcsan/report.c:302
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:357
 check_access kernel/kcsan/core.c:409 [inline]
 __tsan_unaligned_write8+0x143/0x1f0 kernel/kcsan/core.c:530
 sctp_assoc_migrate+0x1a6/0x290 net/sctp/associola.c:1091
 sctp_sock_migrate+0x959/0xa60 net/sctp/socket.c:9465
 sctp_accept+0x3c8/0x470 net/sctp/socket.c:4916
 inet_accept+0x7f/0x360 net/ipv4/af_inet.c:734
 __sys_accept4+0x224/0x430 net/socket.c:1754
 __do_sys_accept4 net/socket.c:1789 [inline]
 __se_sys_accept4 net/socket.c:1786 [inline]
 __x64_sys_accept4+0x5e/0x80 net/socket.c:1786
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45a219
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbd2c302c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd2c3036d4
R13: 00000000004c035c R14: 00000000004d28f0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..