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SubjectRe: [refcount] d2d337b185: WARNING:at_lib/refcount.c:#refcount_warn_saturate
On Sun, 1 Dec 2019 at 16:49, kernel test robot <rong.a.chen@intel.com> wrote:
>
> FYI, we noticed the following commit (built with gcc-7):
>
> commit: d2d337b185bd2abff262f3cf7de0080b3888e41c ("[RESEND PATCH v4 08/10] refcount: Consolidate implementations of refcount_t")
> url: https://github.com/0day-ci/linux/commits/Will-Deacon/Rework-REFCOUNT_FULL-using-atomic_fetch_-operations/20191124-052413
>
>
> in testcase: ocfs2test
> with following parameters:
>
> disk: 1SSD
> test: test-mkfs
>
>
>
> 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):
>
>
> +-----------------------------------------------------------------------------+------------+------------+
> | | 2ab80bd4ae | d2d337b185 |
> +-----------------------------------------------------------------------------+------------+------------+
> | boot_successes | 0 | 0 |
> | boot_failures | 24 | 24 |

So we went from a success rate of 0 out of 24 to 0 out of 24 by
applying that patch. How on earth is that a result that justifies
spamming everybody?


> | BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c | 24 | 24 |
> | stack_segment:#[##] | 6 | 6 |
> | RIP:__kmalloc | 8 | 6 |
> | Kernel_panic-not_syncing:Fatal_exception | 14 | 11 |
> | kernel_BUG_at_mm/slub.c | 9 | 4 |
> | invalid_opcode:#[##] | 9 | 4 |
> | RIP:kfree | 9 | 4 |
> | RIP:native_safe_halt | 4 | 1 |
> | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 6 | 2 |
> | BUG:unable_to_handle_page_fault_for_address | 5 | 1 |
> | Oops:#[##] | 5 | 1 |
> | RIP:kmem_cache_alloc_trace | 3 | 3 |
> | RIP:idr_get_free | 1 | |
> | RIP:console_unlock | 1 | |
> | WARNING:at_lib/refcount.c:#refcount_warn_saturate | 0 | 9 |
> | RIP:refcount_warn_saturate | 0 | 9 |
> | general_protection_fault:#[##] | 0 | 2 |
> | RIP:lru_cache_add_active_or_unevictable | 0 | 1 |
> +-----------------------------------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@intel.com>
>
>
> [ 93.421220] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1533
> [ 93.423478] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2464, name: mount.ocfs2
> [ 93.425258] CPU: 1 PID: 2464 Comm: mount.ocfs2 Not tainted 5.4.0-rc3-00012-gd2d337b185bd2 #1
> [ 93.428185] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [ 93.430982] Call Trace:
> [ 93.432691] dump_stack+0x5c/0x7b
> [ 93.434089] ___might_sleep+0x102/0x120
> [ 93.435629] down_write+0x1c/0x50
> [ 93.436962] configfs_depend_item+0x3a/0xb0
> [ 93.438580] o2hb_region_pin+0xf9/0x180 [ocfs2_nodemanager]
> [ 93.440630] ? inode_doinit_with_dentry+0x250/0x4e0
> [ 93.441860] o2hb_register_callback+0xc6/0x2a0 [ocfs2_nodemanager]
> [ 93.443298] dlm_join_domain+0xbd/0x790 [ocfs2_dlm]
> [ 93.444491] ? debugfs_create_dir+0xc4/0x100
> [ 93.445635] ? dlm_alloc_ctxt+0x42f/0x560 [ocfs2_dlm]
> [ 93.446905] dlm_register_domain+0x31f/0x440 [ocfs2_dlm]
> [ 93.448188] ? _cond_resched+0x19/0x30
> [ 93.449248] o2cb_cluster_connect+0x132/0x2c0 [ocfs2_stack_o2cb]
> [ 93.450701] ocfs2_cluster_connect+0x14b/0x220 [ocfs2_stackglue]
> [ 93.452151] ocfs2_dlm_init+0x2e9/0x4b0 [ocfs2]
> [ 93.453379] ? ocfs2_init_node_maps+0x50/0x50 [ocfs2]
> [ 93.454700] ocfs2_fill_super+0xcf4/0x12a0 [ocfs2]
> [ 93.455952] ? ocfs2_initialize_super+0x1030/0x1030 [ocfs2]
> [ 93.457484] mount_bdev+0x173/0x1b0
> [ 93.458543] legacy_get_tree+0x27/0x40
> [ 93.459615] vfs_get_tree+0x25/0xc0
> [ 93.460650] do_mount+0x715/0x9a0
> [ 93.461697] ksys_mount+0x80/0xd0
> [ 93.462728] __x64_sys_mount+0x21/0x30
> [ 93.463802] do_syscall_64+0x5b/0x1d0
> [ 93.464867] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 93.466224] RIP: 0033:0x7feaa42ee48a
> [ 93.467282] Code: 48 8b 0d 11 fa 2a 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d de f9 2a 00 f7 d8 64 89 01 48
> [ 93.472861] RSP: 002b:00007ffec903d4e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
> [ 93.475973] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feaa42ee48a
> [ 93.479041] RDX: 0000562b43aae3ee RSI: 0000562b444af0b0 RDI: 0000562b444af310
> [ 93.481956] RBP: 00007ffec903d690 R08: 0000562b444af2b0 R09: 0000000000000020
> [ 93.485084] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffec903d580
> [ 93.488128] R13: 0000000000000000 R14: 0000562b444b0000 R15: 00007ffec903d500
> [ 93.494821] o2dlm: Joining domain 58A89FF3B793441A83C86B6A7816B4AF
> [ 93.494822] (
> [ 93.499229] 1
> [ 93.501238] ) 1 nodes
> [ 93.509977] JBD2: Ignoring recovery information on journal
> [ 93.518913] ocfs2: Mounting device (8,0) on (node 1, slot 0) with ordered data mode.
> [ 94.541086] mount /dev/sda /mnt/ocfs2 /dev/sda 16515072 243712 16271360 2% /mnt/ocfs2
> [ 94.541090]
> [ 94.546474] OK
> [ 94.546476]
> [ 94.550726] create testdir /mnt/ocfs2/20191130_125727
> [ 94.550729]
> [ 94.713069] create 15890 files .
> [ 94.713072]
> [ 94.717547]
> [ 98.760820] o2dlm: Leaving domain 58A89FF3B793441A83C86B6A7816B4AF
> [ 98.828610] blk_update_request: I/O error, dev fd0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
> [ 98.830929] floppy: error 10 while reading block 0
> [ 99.561301] ocfs2: Unmounting device (8,0) on (node 1)
> [ 99.563700] ------------[ cut here ]------------
> [ 99.566425] refcount_t: underflow; use-after-free.
> [ 99.569213] WARNING: CPU: 1 PID: 2531 at lib/refcount.c:28 refcount_warn_saturate+0x8d/0xf0
> [ 99.574231] Modules linked in: ocfs2_stack_o2cb ocfs2_dlm ocfs2 ocfs2_nodemanager ocfs2_stackglue jbd2 sr_mod intel_rapl_msr cdrom ata_generic pata_acpi intel_rapl_common crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel sd_mod sg bochs_drm ppdev drm_vram_helper ttm drm_kms_helper snd_pcm syscopyarea ata_piix sysfillrect aesni_intel sysimgblt snd_timer fb_sys_fops crypto_simd libata drm cryptd glue_helper snd soundcore pcspkr joydev serio_raw virtio_scsi i2c_piix4 floppy parport_pc parport ip_tables
> [ 99.593419] CPU: 1 PID: 2531 Comm: umount Tainted: G W 5.4.0-rc3-00012-gd2d337b185bd2 #1
> [ 99.597311] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [ 99.604305] RIP: 0010:refcount_warn_saturate+0x8d/0xf0
> [ 99.607073] Code: 05 ce 6f 37 01 01 e8 32 a0 c1 ff 0f 0b c3 80 3d c1 6f 37 01 00 75 ad 48 c7 c7 e0 9f 73 a5 c6 05 b1 6f 37 01 01 e8 13 a0 c1 ff <0f> 0b c3 80 3d a5 6f 37 01 00 75 8e 48 c7 c7 60 9f 73 a5 c6 05 95
> [ 99.612363] RSP: 0018:ffffa895c0457e20 EFLAGS: 00010282
> [ 99.613931] RAX: 0000000000000000 RBX: ffff8d07e654e000 RCX: 0000000000000000
> [ 99.615800] RDX: ffff8d083fd27640 RSI: ffff8d083fd17778 RDI: ffff8d083fd17778
> [ 99.617687] RBP: ffff8d07db479000 R08: 000000000000050a R09: 0000000000aaaaaa
> [ 99.619574] R10: ffffa895c0457c48 R11: ffff8d0817a4cf20 R12: ffffa895c0457e34
> [ 99.621486] R13: ffff8d07e654e240 R14: ffff8d07e654e0c8 R15: 0000000000000000
> [ 99.623382] FS: 00007f39e9509e40(0000) GS:ffff8d083fd00000(0000) knlGS:0000000000000000
> [ 99.625452] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 99.627106] CR2: 00000000004216d0 CR3: 00000001d2bfe000 CR4: 00000000000406e0
> [ 99.628995] Call Trace:
> [ 99.630127] ocfs2_dismount_volume+0x32a/0x3e0 [ocfs2]
> [ 99.631667] generic_shutdown_super+0x6c/0x120
> [ 99.633102] kill_block_super+0x21/0x50
> [ 99.634424] deactivate_locked_super+0x3f/0x70
> [ 99.635843] cleanup_mnt+0xb8/0x150
> [ 99.637130] task_work_run+0xa3/0xe0
> [ 99.638407] exit_to_usermode_loop+0xeb/0xf0
> [ 99.639827] do_syscall_64+0x1a7/0x1d0
> [ 99.641185] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 99.643068] RIP: 0033:0x7f39e8dedd77
> [ 99.644352] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48
> [ 99.649122] RSP: 002b:00007fffc63b9bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> [ 99.651318] RAX: 0000000000000000 RBX: 0000557e0db2e080 RCX: 00007f39e8dedd77
> [ 99.653282] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000557e0db2e260
> [ 99.655401] RBP: 0000557e0db2e260 R08: 0000557e0db2f600 R09: 0000000000000015
> [ 99.657366] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007f39e92efe64
> [ 99.659581] R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffc63b9e80
> [ 99.661503] ---[ end trace eed33931ffa30ed0 ]---
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.4.0-rc3-00012-gd2d337b185bd2 .config
> make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
> cd <mod-install-dir>
> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
>
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
>
>
>
> Thanks,
> Rong Chen
>

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