Re: [vdpa_sim_net] 79991caf52: net/ipv4/ipmr.c:#RCU-list_traversed_in_non-reader_section

From: Dongli Zhang
Date: Sun Feb 07 2021 - 15:19:38 EST

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Is it possible that the issue is not due to this change?

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@xxxxxxxxx>
>
>
> [ 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
>

Next message: Rikard Falkeborn: "[PATCH] staging: fieldbus: arcx-anybus: constify static structs"
Previous message: Phillip Potter: "[PATCH] staging: rtl8192e: replace spaces with tab for a closing if brace"
In reply to: kernel test robot: "[vdpa_sim_net] 79991caf52: net/ipv4/ipmr.c:#RCU-list_traversed_in_non-reader_section"
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