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WARNING: suspicious RCU usage in rds_loop_conn_alloc

Status: fixed on 2018/06/12 15:59
Subsystems: rds
[Documentation on labels]
Reported-by: syzbot+da36cb8a23beedb61503@syzkaller.appspotmail.com
Fix commit: d4014d8cc6df rds: do not call ->conn_alloc with GFP_KERNEL
First crash: 2407d, last: 2398d
▶ ▼ Duplicate bugs (2)
duplicates (2):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
WARNING: suspicious RCU usage in rds_tcp_conn_alloc rds C 6485 2398d 2406d 22/28 closed as dup on 2018/02/12 16:15
BUG: sleeping function called from invalid context at mm/slab.h:LINE (3) kernel 339 2321d 2406d 0/28 closed as dup on 2018/02/12 16:15
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
WARNING: suspicious RCU usage in rds_loop_conn_alloc 1 (2) 2018/02/12 16:09

Sample crash report:
audit: type=1400 audit(1519040816.897:7): avc:  denied  { map } for  pid=4186 comm="syzkaller908289" path="/root/syzkaller908289817" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1

=============================
WARNING: suspicious RCU usage
4.16.0-rc2+ #320 Not tainted
-----------------------------
./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syzkaller908289/4186:
 #0:  (rcu_read_lock){....}, at: [<00000000a16f96b6>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218

stack backtrace:
CPU: 1 PID: 4186 Comm: syzkaller908289 Not tainted 4.16.0-rc2+ #320
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4592
 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline]
 ___might_sleep+0x385/0x470 kernel/sched/core.c:6098
 __might_sleep+0x95/0x190 kernel/sched/core.c:6086
 slab_pre_alloc_hook mm/slab.h:420 [inline]
 slab_alloc mm/slab.c:3365 [inline]
 kmem_cache_alloc_trace+0x299/0x740 mm/slab.c:3605
 kmalloc include/linux/slab.h:512 [inline]
 kzalloc include/linux/slab.h:701 [inline]
 rds_loop_conn_alloc+0xc8/0x380 net/rds/loop.c:126
 __rds_conn_create+0x112f/0x1b50 net/rds/connection.c:227
 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:309
 rds_sendmsg+0xda3/0x2390 net/rds/send.c:1126
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046
 __sys_sendmsg+0xe5/0x210 net/socket.c:2080
 SYSC_sendmsg net/socket.c:2091 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2087
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x43fe79
RSP: 002b:00007ffeef355d98 EFLAGS: 00000217 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe79
RDX: 0000000000000000 RSI: 000000002000dfc8 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004017a0
R13: 0000000000401830 R14: 0000000000000000 R15: 0000000000000000
BUG: sleeping function called from invalid context at mm/slab.h:420
in_atomic(): 1, irqs_disabled(): 0, pid: 4186, name: syzkaller908289
1 lock held by syzkaller908289/4186:
 #0:  (rcu_read_lock){....}, at: [<00000000a16f96b6>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218
CPU: 1 PID: 4186 Comm: syzkaller908289 Not tainted 4.16.0-rc2+ #320
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6133
 __might_sleep+0x95/0x190 kernel/sched/core.c:6086
 slab_pre_alloc_hook mm/slab.h:420 [inline]
 slab_alloc mm/slab.c:3365 [inline]
 kmem_cache_alloc_trace+0x299/0x740 mm/slab.c:3605
 kmalloc include/linux/slab.h:512 [inline]
 kzalloc include/linux/slab.h:701 [inline]
 rds_loop_conn_alloc+0xc8/0x380 net/rds/loop.c:126
 __rds_conn_create+0x112f/0x1b50 net/rds/connection.c:227
 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:309
 rds_sendmsg+0xda3/0x2390 net/rds/send.c:1126
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046
 __sys_sendmsg+0xe5/0x210 net/socket.c:2080
 SYSC_sendmsg net/socket.c:2091 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2087
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x43fe79
RSP: 002b:00007ffeef355d98 EFLAGS: 00000217 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe79
RDX: 0000000000000000 RSI: 000000002000dfc8 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0

Crashes (34303):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/02/19 11:49 upstream 91ab883eb213 833f78c7 .config console log report syz C ci-upstream-kasan-gce
2018/02/17 12:42 upstream 1e3510b2b053 c8b3f7c1 .config console log report syz C ci-upstream-kasan-gce
2018/02/17 10:01 upstream 1e3510b2b053 c8b3f7c1 .config console log report syz C ci-upstream-kasan-gce
2018/02/12 11:32 upstream 7928b2cbe55b 88bc17df .config console log report syz C ci-upstream-kasan-gce
2018/02/12 11:29 upstream 7928b2cbe55b 88bc17df .config console log report syz C ci-upstream-kasan-gce
2018/02/12 09:49 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 09:36 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 08:07 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 07:53 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 07:39 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 07:24 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 06:39 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 06:15 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 05:55 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 05:14 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 03:23 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/12 01:02 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 23:25 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 22:12 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 21:58 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 20:37 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 19:37 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 17:37 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 15:07 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 12:48 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 12:09 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/11 00:35 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce
2018/02/17 12:56 upstream 1e3510b2b053 c8b3f7c1 .config console log report syz C ci-upstream-kasan-gce-386
2018/02/17 09:47 upstream 1e3510b2b053 c8b3f7c1 .config console log report syz C ci-upstream-kasan-gce-386
2018/02/14 23:56 upstream 6556677a8040 17061fc0 .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 11:46 upstream 7928b2cbe55b 88bc17df .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 11:28 upstream 7928b2cbe55b 88bc17df .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 07:40 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 06:44 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 06:29 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 06:15 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 03:38 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 01:22 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/12 01:08 upstream 7928b2cbe55b 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 21:25 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 20:41 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 19:13 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 18:27 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 15:21 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 14:48 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 13:34 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 12:07 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 05:53 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 05:04 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 04:48 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 04:11 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 03:17 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 02:04 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/11 01:10 upstream d48fcbd864a0 4e9b726d .config console log report syz C ci-upstream-kasan-gce-386
2018/02/19 12:03 net-next-old 1ec010e70593 833f78c7 .config console log report syz C ci-upstream-net-kasan-gce
2018/02/17 12:56 net-next-old 1ec010e70593 c8b3f7c1 .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 11:47 net-next-old 9a61df9e5f74 88bc17df .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 11:15 net-next-old 9a61df9e5f74 88bc17df .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 10:13 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 09:11 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 08:58 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 08:45 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 08:30 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 07:42 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 07:29 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 07:16 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 06:28 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 06:04 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 02:20 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 00:46 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/12 00:00 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 22:57 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 18:58 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 18:13 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 17:48 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 16:04 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 14:59 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 10:24 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 06:56 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 00:01 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/10 23:45 net-next-old 9a61df9e5f74 4e9b726d .config console log report syz C ci-upstream-net-kasan-gce
2018/02/11 12:38 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:36 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:33 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:30 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:27 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:27 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:26 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:24 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:21 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:21 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:18 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:17 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:15 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:15 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:15 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:13 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:09 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:09 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:08 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:07 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:07 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:06 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:04 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:03 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:03 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:01 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:01 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:00 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 12:00 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:56 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:55 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:51 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:50 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:49 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:48 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:47 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:46 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:46 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:46 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/11 11:45 upstream d48fcbd864a0 4e9b726d .config console log report ci-upstream-kasan-gce
2018/02/10 23:27 net-next-old 9a61df9e5f74 4e9b726d .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.