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Message-ID: <20200923084648.GD28663@shao2-debian>
Date: Wed, 23 Sep 2020 16:46:48 +0800
From: kernel test robot <lkp@...el.com>
To: "Ahmed S. Darwish" <a.darwish@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
Subject: [seqlock] 1909760f5f: WARNING:inconsistent_lock_state
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: 1909760f5fc3f123e47b4e24e0ccdc0fc8f3f106 ("seqlock: PREEMPT_RT: Do not starve seqlock_t writers")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: kernel-selftests
version: kernel-selftests-x86_64-e8e8f16e-1_20200807
with following parameters:
group: kselftests-net
ucode: 0x21
test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 8G memory
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+---------------------------------------+------------+------------+
| | 8117ab508f | 1909760f5f |
+---------------------------------------+------------+------------+
| boot_successes | 0 | 0 |
| boot_failures | 0 | 27 |
| dmesg.WARNING:inconsistent_lock_state | 0 | 27 |
+---------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>
kern :warn : [ 309.808218] WARNING: inconsistent lock state
kern :warn : [ 309.813923] 5.9.0-rc2-00048-g1909760f5fc3f #1 Not tainted
kern :warn : [ 309.820815] --------------------------------
kern :warn : [ 309.826576] inconsistent {IN-SOFTIRQ-R} -> {SOFTIRQ-ON-W} usage.
kern :warn : [ 309.834089] ip/16990 [HC0[0]:SC0[0]:HE1:SE1] takes:
kern :warn : [ 309.840492] ffff88803171b290 (&s->seqcount#10){+.+-}-{0:0}, at: xfrm_user_rcv_msg+0x135/0x1e0
kern :warn : [ 309.850616] {IN-SOFTIRQ-R} state was registered at:
kern :warn : [ 309.857021] lock_acquire+0xaf/0x380
kern :warn : [ 309.862214] xfrm_policy_lookup_inexact_addr+0x101/0x120
kern :warn : [ 309.869157] xfrm_policy_find_inexact_candidates+0x50/0xc0
kern :warn : [ 309.876895] xfrm_policy_lookup_bytype+0x48a/0x760
kern :warn : [ 309.883326] xfrm_lookup_with_ifid+0x212/0xc20
kern :warn : [ 309.889390] mld_sendpack+0x187/0x3a0
kern :warn : [ 309.894657] mld_ifc_timer_expire+0x1bb/0x360
kern :warn : [ 309.900603] call_timer_fn+0xa6/0x2e0
kern :warn : [ 309.905848] run_timer_softirq+0x40c/0x5c0
kern :warn : [ 309.911556] __do_softirq+0xea/0x4eb
kern :warn : [ 309.916720] asm_call_on_stack+0x12/0x20
kern :warn : [ 309.922222] do_softirq_own_stack+0x78/0xa0
kern :warn : [ 309.927976] irq_exit_rcu+0xcf/0x120
kern :warn : [ 309.933110] sysvec_apic_timer_interrupt+0x58/0xe0
kern :warn : [ 309.939505] asm_sysvec_apic_timer_interrupt+0x12/0x20
kern :warn : [ 309.946271] cpuidle_enter_state+0x110/0x4e0
kern :warn : [ 309.952154] cpuidle_enter+0x29/0x40
kern :warn : [ 309.957344] do_idle+0x201/0x280
kern :warn : [ 309.962181] cpu_startup_entry+0x19/0x20
kern :warn : [ 309.967725] start_secondary+0x120/0x160
kern :warn : [ 309.973257] secondary_startup_64+0xb6/0xc0
kern :warn : [ 309.979048] irq event stamp: 5701
kern :warn : [ 309.983904] hardirqs last enabled at (5701): [<ffffffff81d96b8a>] syscall_enter_from_user_mode+0x2a/0x2a0
kern :warn : [ 309.995231] hardirqs last disabled at (5700): [<ffffffff81d916cf>] do_syscall_64+0xf/0x40
kern :warn : [ 310.005065] softirqs last enabled at (5688): [<ffffffff81b8b030>] netlink_insert+0x50/0x120
kern :warn : [ 310.015146] softirqs last disabled at (5686): [<ffffffff81ae0cd9>] release_sock+0x19/0xa0
kern :warn : [ 310.024945]
other info that might help us debug this:
kern :warn : [ 310.034639] Possible unsafe locking scenario:
kern :warn : [ 310.043674] CPU0
kern :warn : [ 310.047673] ----
kern :warn : [ 310.051631] lock(&s->seqcount#10);
kern :warn : [ 310.056738] <Interrupt>
kern :warn : [ 310.060875] lock(&s->seqcount#10);
kern :warn : [ 310.066130]
*** DEADLOCK ***
kern :warn : [ 310.076439] 2 locks held by ip/16990:
kern :warn : [ 310.081591] #0: ffff88803171b628 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{3:3}, at: xfrm_netlink_rcv+0x24/0x40
kern :warn : [ 310.092781] #1: ffff88803171b2d8 (&(&net->xfrm.policy_hthresh.lock)->lock){+.+.}-{2:2}, at: xfrm_set_spdinfo+0xab/0x160
kern :warn : [ 310.105327]
stack backtrace:
kern :warn : [ 310.112731] CPU: 2 PID: 16990 Comm: ip Not tainted 5.9.0-rc2-00048-g1909760f5fc3f #1
kern :warn : [ 310.122097] Hardware name: Hewlett-Packard HP Pro 3340 MT/17A1, BIOS 8.07 01/24/2013
kern :warn : [ 310.131472] Call Trace:
kern :warn : [ 310.135475] dump_stack+0x8d/0xc0
kern :warn : [ 310.140377] mark_lock_irq+0x4f2/0x500
kern :warn : [ 310.145730] ? stack_trace_save+0x4b/0x80
kern :warn : [ 310.151298] ? save_trace+0x42/0x360
kern :warn : [ 310.156420] mark_lock+0x1c1/0x500
kern :warn : [ 310.161338] __lock_acquire+0x393/0xb80
kern :warn : [ 310.166684] lock_acquire+0xaf/0x380
kern :warn : [ 310.171732] ? xfrm_user_rcv_msg+0x135/0x1e0
kern :warn : [ 310.177509] xfrm_set_spdinfo+0xd4/0x160
kern :warn : [ 310.182918] ? xfrm_user_rcv_msg+0x135/0x1e0
kern :warn : [ 310.188671] xfrm_user_rcv_msg+0x135/0x1e0
kern :warn : [ 310.194248] ? __mutex_lock+0x21d/0x9e0
kern :warn : [ 310.199553] ? preempt_count_sub+0xa1/0xe0
kern :warn : [ 310.205144] ? __mutex_lock+0x21d/0x9e0
kern :warn : [ 310.210457] ? lock_acquire+0xaf/0x380
kern :warn : [ 310.215655] ? netlink_deliver_tap+0x93/0x3e0
kern :warn : [ 310.221468] ? xfrm_netlink_rcv+0x24/0x40
kern :warn : [ 310.226901] ? xfrm_user_state_lookup+0xc0/0xc0
kern :warn : [ 310.233909] netlink_rcv_skb+0x49/0x120
kern :warn : [ 310.239169] xfrm_netlink_rcv+0x33/0x40
kern :warn : [ 310.244425] netlink_unicast+0x191/0x240
kern :warn : [ 310.249721] netlink_sendmsg+0x24f/0x480
kern :warn : [ 310.255048] sock_sendmsg+0x5e/0x60
kern :warn : [ 310.259910] ____sys_sendmsg+0x1f6/0x260
kern :warn : [ 310.265207] ? copy_msghdr_from_user+0x5c/0xa0
kern :warn : [ 310.271035] ___sys_sendmsg+0x81/0xc0
kern :warn : [ 310.276081] ? lock_acquire+0xaf/0x380
kern :warn : [ 310.281224] ? find_held_lock+0x2b/0x80
kern :warn : [ 310.286438] ? __might_fault+0x36/0x80
kern :warn : [ 310.291566] ? _copy_to_user+0x69/0x80
kern :warn : [ 310.296684] ? move_addr_to_user+0xc3/0x100
kern :warn : [ 310.302249] __sys_sendmsg+0x59/0xa0
kern :warn : [ 310.307188] ? lockdep_hardirqs_on+0x7d/0x100
kern :warn : [ 310.312911] do_syscall_64+0x33/0x40
kern :warn : [ 310.317857] entry_SYSCALL_64_after_hwframe+0x44/0xa9
kern :warn : [ 310.324292] RIP: 0033:0x7fc920c9e914
kern :warn : [ 310.329272] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53
kern :warn : [ 310.351209] RSP: 002b:00007fff0c088ff8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
kern :warn : [ 310.360381] RAX: ffffffffffffffda RBX: 000000005f6a1c6c RCX: 00007fc920c9e914
kern :warn : [ 310.369104] RDX: 0000000000000000 RSI: 00007fff0c089060 RDI: 0000000000000006
kern :warn : [ 310.377830] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000006
kern :warn : [ 310.386538] R10: fffffffffffff1f9 R11: 0000000000000246 R12: 0000000000000001
kern :warn : [ 310.395277] R13: 00007fff0c089140 R14: 00007fff0c08b436 R15: 00007fff0c08b445
user :notice: [ 332.480919] # PASS: ping to .254 bypassed ipsec tunnel (exceptions and block policies after hresh changes)
user :notice: [ 332.549293] # PASS: direct policy matches (exceptions and block policies after hresh changes)
user :notice: [ 332.617915] # PASS: policy matches (exceptions and block policies after hresh changes)
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
lkp
View attachment "config-5.9.0-rc2-00048-g1909760f5fc3f" of type "text/plain" (209866 bytes)
View attachment "job-script" of type "text/plain" (6596 bytes)
Download attachment "kmsg.xz" of type "application/x-xz" (67176 bytes)
View attachment "kernel-selftests" of type "text/plain" (196977 bytes)
View attachment "job.yaml" of type "text/plain" (5769 bytes)
View attachment "reproduce" of type "text/plain" (129 bytes)
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