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Date: Thu, 18 Mar 2021 14:31:10 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Joe Jin <joe.jin@...cle.com>
Cc: Dongli Zhang <dongli.zhang@...cle.com>,
"Michael S. Tsirkin" <mst@...hat.com>, Eli Cohen <elic@...dia.com>,
Jason Wang <jasowang@...hat.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com, virtualization@...ts.linux-foundation.org,
kvm@...r.kernel.org, netdev@...r.kernel.org, pbonzini@...hat.com,
stefanha@...hat.com, aruna.ramakrishna@...cle.com
Subject: Re: [vdpa_sim_net] 79991caf52:
net/ipv4/ipmr.c:#RCU-list_traversed_in_non-reader_section
Hi Joe and Dongli,
On Mon, Feb 08, 2021 at 08:10:21AM -0800, Joe Jin wrote:
> On 2/7/21 12:15 PM, Dongli Zhang wrote:
> > Is it possible that the issue is not due to this change?
>
> Looks this issue does not related your change, from dmesg output, when issue occurred, virtio was not loaded:
>
> [ 502.508450] ------------[ cut here ]------------
> [ 502.511859] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x22a/0x240
> [ 502.524018] Modules linked in:
> [ 502.539642] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc4-00008-g79991caf5202 #1
>
thanks for explanation and sorry for false positive.
we will investigate further to avoid such kind of false positive in the future.
> >
> > This change is just to call different API to allocate memory, which is
> > equivalent to kzalloc()+vzalloc().
> >
> > Before the change:
> >
> > try kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
> >
> > ... and then below if the former is failed.
> >
> > vzalloc(sizeof(*vs));
> >
> >
> > After the change:
> >
> > try kmalloc_node(size, FP_KERNEL|GFP_ZERO|__GFP_NOWARN|__GFP_NORETRY, node);
> >
> > ... and then below if the former is failed
> >
> > __vmalloc_node(size, 1, GFP_KERNEL|GFP_ZERO, node, __builtin_return_address(0));
> >
> >
> > The below is the first WARNING in uploaded dmesg. I assume it was called before
> > to open /dev/vhost-scsi.
> >
> > Will this test try to open /dev/vhost-scsi?
> >
> > [ 5.095515] =============================
> > [ 5.095515] WARNING: suspicious RCU usage
> > [ 5.095515] 5.11.0-rc4-00008-g79991caf5202 #1 Not tainted
> > [ 5.095534] -----------------------------
> > [ 5.096041] security/smack/smack_lsm.c:351 RCU-list traversed in non-reader
> > section!!
> > [ 5.096982]
> > [ 5.096982] other info that might help us debug this:
> > [ 5.096982]
> > [ 5.097953]
> > [ 5.097953] rcu_scheduler_active = 1, debug_locks = 1
> > [ 5.098739] no locks held by kthreadd/2.
> > [ 5.099237]
> > [ 5.099237] stack backtrace:
> > [ 5.099537] CPU: 0 PID: 2 Comm: kthreadd Not tainted
> > 5.11.0-rc4-00008-g79991caf5202 #1
> > [ 5.100470] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > 1.12.0-1 04/01/2014
> > [ 5.101442] Call Trace:
> > [ 5.101807] dump_stack+0x15f/0x1bf
> > [ 5.102298] smack_cred_prepare+0x400/0x420
> > [ 5.102840] ? security_prepare_creds+0xd4/0x120
> > [ 5.103441] security_prepare_creds+0x84/0x120
> > [ 5.103515] prepare_creds+0x3f1/0x580
> > [ 5.103515] copy_creds+0x65/0x480
> > [ 5.103515] copy_process+0x7b4/0x3600
> > [ 5.103515] ? check_prev_add+0xa40/0xa40
> > [ 5.103515] ? lockdep_enabled+0xd/0x60
> > [ 5.103515] ? lock_is_held_type+0x1a/0x100
> > [ 5.103515] ? __cleanup_sighand+0xc0/0xc0
> > [ 5.103515] ? lockdep_unlock+0x39/0x160
> > [ 5.103515] kernel_clone+0x165/0xd20
> > [ 5.103515] ? copy_init_mm+0x20/0x20
> > [ 5.103515] ? pvclock_clocksource_read+0xd9/0x1a0
> > [ 5.103515] ? sched_clock_local+0x99/0xc0
> > [ 5.103515] ? kthread_insert_work_sanity_check+0xc0/0xc0
> > [ 5.103515] kernel_thread+0xba/0x100
> > [ 5.103515] ? __ia32_sys_clone3+0x40/0x40
> > [ 5.103515] ? kthread_insert_work_sanity_check+0xc0/0xc0
> > [ 5.103515] ? do_raw_spin_unlock+0xa9/0x160
> > [ 5.103515] kthreadd+0x68f/0x7a0
> > [ 5.103515] ? kthread_create_on_cpu+0x160/0x160
> > [ 5.103515] ? lockdep_hardirqs_on+0x77/0x100
> > [ 5.103515] ? _raw_spin_unlock_irq+0x24/0x60
> > [ 5.103515] ? kthread_create_on_cpu+0x160/0x160
> > [ 5.103515] ret_from_fork+0x22/0x30
> >
> > Thank you very much!
> >
> > Dongli Zhang
> >
> >
> > On 2/6/21 7:03 PM, kernel test robot wrote:
> >> Greeting,
> >>
> >> FYI, we noticed the following commit (built with gcc-9):
> >>
> >> commit: 79991caf5202c7989928be534727805f8f68bb8d ("vdpa_sim_net: Add support for user supported devices")
> >> https://urldefense.com/v3/__https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git__;!!GqivPVa7Brio!LfgrgVVtPAjwjqTZX8yANgsix4f3cJmAA_CcMeCVymh5XYcamWdR9dnbIQA-p61PJtI$ Dongli-Zhang/vhost-scsi-alloc-vhost_scsi-with-kvzalloc-to-avoid-delay/20210129-191605
> >>
> >>
> >> in testcase: trinity
> >> version: trinity-static-x86_64-x86_64-f93256fb_2019-08-28
> >> with following parameters:
> >>
> >> runtime: 300s
> >>
> >> test-description: Trinity is a linux system call fuzz tester.
> >> test-url: https://urldefense.com/v3/__http://codemonkey.org.uk/projects/trinity/__;!!GqivPVa7Brio!LfgrgVVtPAjwjqTZX8yANgsix4f3cJmAA_CcMeCVymh5XYcamWdR9dnbIQA-6Y4x88c$
> >>
> >>
> >> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
> >>
> >> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> >>
> >>
> >> +-------------------------------------------------------------------------+------------+------------+
> >> | | 39502d042a | 79991caf52 |
> >> +-------------------------------------------------------------------------+------------+------------+
> >> | boot_successes | 0 | 0 |
> >> | boot_failures | 62 | 57 |
> >> | WARNING:suspicious_RCU_usage | 62 | 57 |
> >> | security/smack/smack_lsm.c:#RCU-list_traversed_in_non-reader_section | 62 | 57 |
> >> | security/smack/smack_access.c:#RCU-list_traversed_in_non-reader_section | 62 | 57 |
> >> | BUG:workqueue_lockup-pool | 33 | 40 |
> >> | BUG:kernel_hang_in_boot_stage | 6 | 2 |
> >> | net/mac80211/util.c:#RCU-list_traversed_in_non-reader_section | 23 | 15 |
> >> | WARNING:SOFTIRQ-safe->SOFTIRQ-unsafe_lock_order_detected | 18 | |
> >> | WARNING:inconsistent_lock_state | 5 | |
> >> | inconsistent{SOFTIRQ-ON-W}->{IN-SOFTIRQ-W}usage | 5 | |
> >> | calltrace:asm_call_irq_on_stack | 2 | |
> >> | RIP:lock_acquire | 2 | |
> >> | RIP:check_kcov_mode | 1 | |
> >> | RIP:native_safe_halt | 2 | |
> >> | INFO:rcu_sched_self-detected_stall_on_CPU | 2 | |
> >> | RIP:clear_page_rep | 1 | |
> >> | WARNING:at_drivers/gpu/drm/vkms/vkms_crtc.c:#vkms_vblank_simulate | 9 | 7 |
> >> | RIP:vkms_vblank_simulate | 9 | 7 |
> >> | RIP:__slab_alloc | 3 | 3 |
> >> | RIP:__do_softirq | 2 | |
> >> | RIP:console_unlock | 6 | 3 |
> >> | invoked_oom-killer:gfp_mask=0x | 1 | |
> >> | Mem-Info | 1 | |
> >> | RIP:vprintk_emit | 1 | |
> >> | RIP:__asan_load4 | 1 | |
> >> | kernel_BUG_at_kernel/sched/core.c | 0 | 1 |
> >> | invalid_opcode:#[##] | 0 | 1 |
> >> | RIP:sched_cpu_dying | 0 | 1 |
> >> | WARNING:possible_circular_locking_dependency_detected | 0 | 1 |
> >> | Kernel_panic-not_syncing:Fatal_exception | 0 | 1 |
> >> | net/ipv4/ipmr.c:#RCU-list_traversed_in_non-reader_section | 0 | 8 |
> >> | RIP:arch_local_irq_restore | 0 | 1 |
> >> | RIP:idr_get_free | 0 | 1 |
> >> | net/ipv6/ip6mr.c:#RCU-list_traversed_in_non-reader_section | 0 | 2 |
> >> +-------------------------------------------------------------------------+------------+------------+
> >>
> >>
> >> If you fix the issue, kindly add following tag
> >> Reported-by: kernel test robot <oliver.sang@...el.com>
> >>
> >>
> >> [ 890.196279] =============================
> >> [ 890.212608] WARNING: suspicious RCU usage
> >> [ 890.228281] 5.11.0-rc4-00008-g79991caf5202 #1 Tainted: G W
> >> [ 890.244087] -----------------------------
> >> [ 890.259417] net/ipv4/ipmr.c:138 RCU-list traversed in non-reader section!!
> >> [ 890.275043]
> >> [ 890.275043] other info that might help us debug this:
> >> [ 890.275043]
> >> [ 890.318497]
> >> [ 890.318497] rcu_scheduler_active = 2, debug_locks = 1
> >> [ 890.346089] 2 locks held by trinity-c1/2476:
> >> [ 890.360897] #0: ffff888149d6f400 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xc0/0xe0
> >> [ 890.375165] #1: ffff8881cabfd5c8 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xa0/0x9c0
> >> [ 890.389706]
> >> [ 890.389706] stack backtrace:
> >> [ 890.416375] CPU: 1 PID: 2476 Comm: trinity-c1 Tainted: G W 5.11.0-rc4-00008-g79991caf5202 #1
> >> [ 890.430706] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> >> [ 890.444971] Call Trace:
> >> [ 890.458554] dump_stack+0x15f/0x1bf
> >> [ 890.471996] ipmr_get_table+0x140/0x160
> >> [ 890.485328] ipmr_vif_seq_start+0x4d/0xe0
> >> [ 890.498620] seq_read_iter+0x1b2/0x9c0
> >> [ 890.511469] ? kvm_sched_clock_read+0x14/0x40
> >> [ 890.524008] ? sched_clock+0x1b/0x40
> >> [ 890.536095] ? iov_iter_init+0x7c/0xa0
> >> [ 890.548028] seq_read+0x2fd/0x3e0
> >> [ 890.559948] ? seq_hlist_next_percpu+0x140/0x140
> >> [ 890.572204] ? should_fail+0x78/0x2a0
> >> [ 890.584189] ? write_comp_data+0x2a/0xa0
> >> [ 890.596235] ? __sanitizer_cov_trace_pc+0x1d/0x60
> >> [ 890.608134] ? seq_hlist_next_percpu+0x140/0x140
> >> [ 890.620042] proc_reg_read+0x14e/0x180
> >> [ 890.631585] do_iter_read+0x397/0x420
> >> [ 890.642843] vfs_readv+0xf5/0x160
> >> [ 890.653833] ? vfs_iter_read+0x80/0x80
> >> [ 890.664229] ? __fdget_pos+0xc0/0xe0
> >> [ 890.674236] ? pvclock_clocksource_read+0xd9/0x1a0
> >> [ 890.684259] ? kvm_sched_clock_read+0x14/0x40
> >> [ 890.693852] ? sched_clock+0x1b/0x40
> >> [ 890.702898] ? sched_clock_cpu+0x18/0x120
> >> [ 890.711648] ? write_comp_data+0x2a/0xa0
> >> [ 890.720243] ? __sanitizer_cov_trace_pc+0x1d/0x60
> >> [ 890.729290] do_readv+0x111/0x260
> >> [ 890.738205] ? vfs_readv+0x160/0x160
> >> [ 890.747154] ? lockdep_hardirqs_on+0x77/0x100
> >> [ 890.756100] ? syscall_enter_from_user_mode+0x8a/0x100
> >> [ 890.765126] do_syscall_64+0x34/0x80
> >> [ 890.773795] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> >> [ 890.782630] RIP: 0033:0x453b29
> >> [ 890.791189] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 3b 84 00 00 c3 66 2e 0f 1f 84 00 00 00 00
> >> [ 890.810866] RSP: 002b:00007ffcda44fb18 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
> >> [ 890.820764] RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000453b29
> >> [ 890.830792] RDX: 000000000000009a RSI: 0000000001de1c00 RDI: 00000000000000b9
> >> [ 890.840626] RBP: 00007ffcda44fbc0 R08: 722c279d69ffc468 R09: 0000000000000400
> >> [ 890.850366] R10: 0098d82a42c63c22 R11: 0000000000000246 R12: 0000000000000002
> >> [ 890.860001] R13: 00007f042ae6f058 R14: 00000000010a2830 R15: 00007f042ae6f000
> >>
> >>
> >>
> >> To reproduce:
> >>
> >> # build kernel
> >> cd linux
> >> cp config-5.11.0-rc4-00008-g79991caf5202 .config
> >> make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
> >>
> >> git clone https://urldefense.com/v3/__https://github.com/intel/lkp-tests.git__;!!GqivPVa7Brio!LfgrgVVtPAjwjqTZX8yANgsix4f3cJmAA_CcMeCVymh5XYcamWdR9dnbIQA-Qkr9TyI$
> >> cd lkp-tests
> >> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
> >>
> >>
> >>
> >> Thanks,
> >> Oliver Sang
> >>
>
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