Date:   Mon, 13 Feb 2017 00:06:49 +0200
From:   Sami Farin <hvtaifwkbgefbaei@...il.com>
To:     Linux kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] 4.9.9 shrink_slab prune_icache_sb crash

4.4 kernel had working [non-crashing] shrink_slab and friends...
x86_64 arch , Core i5 2500K, 16 GiB.

kernel: BUG: unable to handle kernel paging request at 0000000200000157
kernel: IP: [<ffffffff9510a45a>] __lock_acquire.isra.15+0x39a/0x930
kernel: PGD 0 
kernel: 
kernel: Oops: 0000 [#1] PREEMPT SMP
kernel: Modules linked in: ip6t_REJECT nf_reject_ipv6 tun nfnetlink_queue nfnetlink_log snd_seq_dummy nls_utf8 nls_iso8859_1 nls_cp437 vfat fat uas usb_storage sctp_diag sctp dccp_diag dccp tcp_cdg tcp_cubic fuse nf_conntrack_netlink nfnetlink_acct ip6table_mangle nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6t_rt ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat iptable_raw xt_mark xt_connmark iptable_mangle ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_length xt_limit xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_connlimit xt_owner xt_hashlimit xt_multiport xt_conntrack nf_conntrack xt_set iptable_filter ip_set_hash_net ip_set nfnetlink cls_fw sch_pie sch_htb arptable_filter arp_tables cfg80211 w83627ehf hwmon_vid coretemp hwmon
kernel: kvm_intel iTCO_wdt iTCO_vendor_support btusb kvm btrtl btbcm mxm_wmi btintel bluetooth irqbypass rfkill snd_hda_codec_hdmi i2c_i801 snd_hda_codec_realtek i2c_smbus snd_hda_codec_generic lpc_ich snd_hda_intel snd_hda_codec snd_hda_core battery rtc_cmos acpi_cpufreq sch_fq_codel tcp_bbr binfmt_misc snd_pcm_oss snd_seq snd_seq_device snd_pcm snd_timer ip_tables x_tables algif_skcipher af_alg usbhid r8169 mii xhci_pci xhci_hcd i915 e1000e ehci_pci ptp ehci_hcd usbcore pps_core usb_common video fjes wmi button 8021q mrp scsi_transport_iscsi sunrpc snd_mixer_oss snd soundcore analog gameport joydev i2c_dev ecryptfs autofs4 [last unloaded: pcspkr]
kernel: CPU: 3 PID: 6444 Comm: pulseaudio Not tainted 4.9.9+ #88
kernel: Hardware name: System manufacturer System Product Name/P8Z68-V PRO GEN3, BIOS 3402 05/07/2012
kernel: task: ffff9319c2526900 task.stack: ffffb31700eac000
kernel: RIP: 0010:[<ffffffff9510a45a>]  [<ffffffff9510a45a>] __lock_acquire.isra.15+0x39a/0x930
kernel: RSP: 0000:ffffb31700eaf4e8  EFLAGS: 00010097
kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000020000014f
kernel: RBP: ffffb31700eaf528 R08: 0000000000000000 R09: 0000000000000000
kernel: R10: 0000000000000000 R11: 0000000000000001 R12: 000000020000014f
kernel: R13: ffff9319c2526900 R14: 0000000000000000 R15: 0000000000000000
kernel: FS:  00007f320f39f940(0000) GS:ffff931a1f180000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 0000000200000157 CR3: 00000003c27c7000 CR4: 00000000000406e0
kernel: Stack:
kernel: 0000000000000000 ffffb31700eaf558 0000000000000286 0000000000000282
kernel: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
kernel: ffffb31700eaf590 ffffffff9510ae16 ffffffff95244efa 0000000000000000
kernel: Call Trace:
kernel: [<ffffffff9510ae16>] lock_acquire+0xd6/0x180
kernel: [<ffffffff95244efa>] ? remove_inode_buffers+0x3a/0x90
kernel: [<ffffffff9594b053>] _raw_spin_lock+0x33/0x50
kernel: [<ffffffff95244efa>] ? remove_inode_buffers+0x3a/0x90
kernel: [<ffffffff95244efa>] remove_inode_buffers+0x3a/0x90
kernel: [<ffffffff95228e3e>] inode_lru_isolate+0xde/0x1b0
kernel: [<ffffffff951c8e49>] __list_lru_walk_one.isra.2+0x99/0x160
kernel: [<ffffffff95228d60>] ? iput+0x290/0x290
kernel: [<ffffffff951c8f2e>] list_lru_walk_one+0x1e/0x20
kernel: [<ffffffff95229c8b>] prune_icache_sb+0x3b/0x60
kernel: [<ffffffff9520fdc9>] super_cache_scan+0x149/0x1a0
kernel: [<ffffffff951af2ce>] shrink_slab.part.15+0x22e/0x4b0
kernel: [<ffffffff951af57f>] shrink_slab+0x2f/0x40
kernel: [<ffffffff951b30ab>] shrink_node+0xeb/0x2e0
kernel: [<ffffffff951b3367>] do_try_to_free_pages+0xc7/0x2d0
kernel: [<ffffffff951b363e>] try_to_free_pages+0xce/0x210
kernel: [<ffffffff951a357f>] __alloc_pages_nodemask+0x59f/0xde0
kernel: [<ffffffff9522aeb0>] ? expand_files+0x1e0/0x1e0
kernel: [<ffffffff951a3dd2>] __get_free_pages+0x12/0x40
kernel: [<ffffffff952204c4>] __pollwait+0x94/0xe0
kernel: [<ffffffffc03a2cf4>] snd_ctl_poll+0x34/0x60 [snd]
kernel: [<ffffffff95221a1e>] do_sys_poll+0x26e/0x520
kernel: [<ffffffff950f9f84>] ? check_preempt_wakeup+0x144/0x240
kernel: [<ffffffff95220430>] ? poll_initwait+0x40/0x40
kernel: [<ffffffff95220740>] ? poll_select_copy_remaining+0x120/0x120
kernel: message repeated 8 times: [ [<ffffffff95220740>] ? poll_select_copy_remaining+0x120/0x120]
kernel: [<ffffffff95221fa3>] SyS_ppoll+0x163/0x190
kernel: [<ffffffff95002e36>] ? lockdep_sys_exit_thunk+0x16/0x18
kernel: [<ffffffff9594b9b7>] entry_SYSCALL_64_fastpath+0x1a/0xae
kernel: Code: 8b 3c 25 00 d4 00 00 e8 75 f7 ff ff e8 b0 f9 ff ff e8 f8 8c 35 00 31 db 48 83 c4 18 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 f0 <49> 8b 44 c4 08 48 85 c0 0f 85 c9 fc ff ff e9 9b fc ff ff e8 3e 
kernel: RIP  [<ffffffff9510a45a>] __lock_acquire.isra.15+0x39a/0x930
kernel: RSP <ffffb31700eaf4e8>
kernel: CR2: 0000000200000157
kernel: ---[ end trace b8fb7bade0b2bc45 ]---
kernel: note: pulseaudio[6444] exited with preempt_count 1
kernel: kernel tried to execute NX-protected page - exploit attempt? (uid: 500)
kernel: BUG: unable to handle kernel paging request at ffffb31700eafd68
kernel: IP: [<ffffb31700eafd68>] 0xffffb31700eafd68
kernel: PGD 40cc39067 
kernel: PUD 40cc3c067 
kernel: PMD 40c5c6067 
kernel: PTE 80000003c27c6163
kernel: 
kernel: Oops: 0011 [#2] PREEMPT SMP
kernel: Modules linked in: ip6t_REJECT nf_reject_ipv6 tun nfnetlink_queue nfnetlink_log snd_seq_dummy nls_utf8 nls_iso8859_1 nls_cp437 vfat fat uas usb_storage sctp_diag sctp dccp_diag dccp tcp_cdg tcp_cubic fuse nf_conntrack_netlink nfnetlink_acct ip6table_mangle nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6t_rt ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat iptable_raw xt_mark xt_connmark iptable_mangle ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_length xt_limit xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_connlimit xt_owner xt_hashlimit xt_multiport xt_conntrack nf_conntrack xt_set iptable_filter ip_set_hash_net ip_set nfnetlink cls_fw sch_pie sch_htb arptable_filter arp_tables cfg80211 w83627ehf hwmon_vid coretemp hwmon
kernel: kvm_intel iTCO_wdt iTCO_vendor_support btusb kvm btrtl btbcm mxm_wmi btintel bluetooth irqbypass rfkill snd_hda_codec_hdmi i2c_i801 snd_hda_codec_realtek i2c_smbus snd_hda_codec_generic lpc_ich snd_hda_intel snd_hda_codec snd_hda_core battery rtc_cmos acpi_cpufreq sch_fq_codel tcp_bbr binfmt_misc snd_pcm_oss snd_seq snd_seq_device snd_pcm snd_timer ip_tables x_tables algif_skcipher af_alg usbhid r8169 mii xhci_pci xhci_hcd i915 e1000e ehci_pci ptp ehci_hcd usbcore pps_core usb_common video fjes wmi button 8021q mrp scsi_transport_iscsi sunrpc snd_mixer_oss snd soundcore analog gameport joydev i2c_dev ecryptfs autofs4 [last unloaded: pcspkr]
kernel: CPU: 3 PID: 25837 Comm: threaded-ml Tainted: G      D         4.9.9+ #88
kernel: Hardware name: System manufacturer System Product Name/P8Z68-V PRO GEN3, BIOS 3402 05/07/2012
kernel: task: ffff9316664fbf00 task.stack: ffffb3170cbb0000
kernel: RIP: 0010:[<ffffb31700eafd68>]  [<ffffb31700eafd68>] 0xffffb31700eafd68
kernel: RSP: 0018:ffffb3170cbb3d90  EFLAGS: 00010097
kernel: RAX: ffffb31700eafd00 RBX: 00000000bd1f0000 RCX: 0000000000000001
kernel: RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffb31700eafd00
kernel: RBP: ffffb3170cbb3dd0 R08: 0000000000000001 R09: 0000000000000000
kernel: R10: ffff9316664fbf00 R11: 0000000000000000 R12: ffff931759f2df40
kernel: R13: ffffffff950ed43a R14: 0000000000000000 R15: 0000000000000003
kernel: FS:  00007f17b10fb700(0000) GS:ffff931a1f180000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: ffffb31700eafd68 CR3: 00000003bae33000 CR4: 00000000000406e0
kernel: Stack:
kernel: ffffffff95104a98 0000000159f2df08 0000000000000001 ffff9316664fbf00
kernel: ffff931759f2df08 ffff931759f2df40 ffff931759f2df00 0000000000000008
kernel: ffffb3170cbb3de0 ffffffff95104b43 ffffb3170cbb3e50 ffffffff9525908f
kernel: Call Trace:
kernel: [<ffffffff95104a98>] ? __wake_up_common+0x48/0x80
kernel: [<ffffffff95104b43>] __wake_up_locked_key+0x13/0x20
kernel: [<ffffffff9525908f>] eventfd_write+0xbf/0x220
kernel: [<ffffffff950ed750>] ? wake_up_q+0x80/0x80
kernel: [<ffffffff9520b523>] __vfs_write+0x23/0x120
kernel: [<ffffffff9520c261>] vfs_write+0xb1/0x1a0
kernel: [<ffffffff9520d584>] SyS_write+0x44/0xb0
kernel: [<ffffffff9594b9b7>] entry_SYSCALL_64_fastpath+0x1a/0xae
kernel: Code: 93 ff ff 18 94 19 1f 1a 93 ff ff 18 94 19 1f 1a 93 ff ff 18 94 19 1f 1a 93 ff ff 80 69 52 c2 19 93 ff ff d0 fd ea 00 17 b3 ff ff <78> 8b 0f 95 ff ff ff ff ab dd 0e 95 ff ff ff ff 90 fd ea 00 17 
kernel: RIP  [<ffffb31700eafd68>] 0xffffb31700eafd68
kernel: RSP <ffffb3170cbb3d90>
kernel: CR2: ffffb31700eafd68
kernel: ---[ end trace b8fb7bade0b2bc46 ]---
kernel: note: threaded-ml[25837] exited with preempt_count 1

5 min later I did kill -9 for quodlibet and pulseaudio

systemd: systemd-udevd.service: Watchdog timeout (limit 3min)!
systemd: systemd-udevd.service: State 'stop-sigabrt' timed out. Terminating.
kernel: BUG: unable to handle kernel paging request at ffffb31700eafcd8
kernel: IP: [<ffffffff95104a76>] __wake_up_common+0x26/0x80
kernel: PGD 40cc39067 
kernel: PUD 40cc3c067 
kernel: PMD 40c5c6067 
kernel: PTE 0
kernel: 
kernel: Oops: 0000 [#3] PREEMPT SMP
kernel: Modules linked in: ip6t_REJECT nf_reject_ipv6 tun nfnetlink_queue nfnetlink_log snd_seq_dummy nls_utf8 nls_iso8859_1 nls_cp437 vfat fat uas usb_storage sctp_diag sctp dccp_diag dccp tcp_cdg tcp_cubic fuse nf_conntrack_netlink nfnetlink_acct ip6table_mangle nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6t_rt ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat iptable_raw xt_mark xt_connmark iptable_mangle ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_length xt_limit xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_connlimit xt_owner xt_hashlimit xt_multiport xt_conntrack nf_conntrack xt_set iptable_filter ip_set_hash_net ip_set nfnetlink cls_fw sch_pie sch_htb arptable_filter arp_tables cfg80211 w83627ehf hwmon_vid coretemp hwmon
kernel: kvm_intel iTCO_wdt iTCO_vendor_support btusb kvm btrtl btbcm mxm_wmi btintel bluetooth irqbypass rfkill snd_hda_codec_hdmi i2c_i801 snd_hda_codec_realtek i2c_smbus snd_hda_codec_generic lpc_ich snd_hda_intel snd_hda_codec snd_hda_core battery rtc_cmos acpi_cpufreq sch_fq_codel tcp_bbr binfmt_misc snd_pcm_oss snd_seq snd_seq_device snd_pcm snd_timer ip_tables x_tables algif_skcipher af_alg usbhid r8169 mii xhci_pci xhci_hcd i915 e1000e ehci_pci ptp ehci_hcd usbcore pps_core usb_common video fjes wmi button 8021q mrp scsi_transport_iscsi sunrpc snd_mixer_oss snd soundcore analog gameport joydev i2c_dev ecryptfs autofs4 [last unloaded: pcspkr]
kernel: CPU: 2 PID: 25840 Comm: aqueue:src Tainted: G      D         4.9.9+ #88
kernel: Hardware name: System manufacturer System Product Name/P8Z68-V PRO GEN3, BIOS 3402 05/07/2012
kernel: task: ffff93180682d400 task.stack: ffffb3170a3b4000
kernel: RIP: 0010:[<ffffffff95104a76>]  [<ffffffff95104a76>] __wake_up_common+0x26/0x80
kernel: RSP: 0018:ffffb3170a3b7ae8  EFLAGS: 00010083
kernel: RAX: 0000000000000292 RBX: ffff9319013c5780 RCX: 0000000000000000
kernel: RDX: ffffb31700eafcd8 RSI: 0000000000000001 RDI: ffff9319013c5780
kernel: RBP: ffffb3170a3b7b20 R08: 0000000000000000 R09: 0000000000000000
kernel: R10: ffff93180682d400 R11: 0000000000000000 R12: ffff9319013c57b8
kernel: R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
kernel: FS:  00007f17a3df9700(0000) GS:ffff931a1f100000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: ffffb31700eafcd8 CR3: 00000004060d3000 CR4: 00000000000406e0
kernel: Stack:
kernel: 0000000000000001 0000000000000000 ffff9319013c5780 0000000000000292
kernel: 0000000000000001 0000000000000000 0000000000000000 ffffb3170a3b7b58
kernel: ffffffff95104b04 ffff93173f1d8680 ffff93173f1dbbb0 0000000000000001
kernel: Call Trace:
kernel: [<ffffffff95104b04>] __wake_up+0x34/0x50
kernel: [<ffffffff957fa48e>] sock_def_wakeup+0x5e/0x90
kernel: [<ffffffff957fa430>] ? sock_def_error_report+0xf0/0xf0
kernel: [<ffffffff958cb08a>] unix_release_sock+0x21a/0x290
kernel: [<ffffffff958cb118>] unix_release+0x18/0x30
kernel: [<ffffffff957f5f5a>] sock_release+0x1a/0x70
kernel: [<ffffffff957f5fbd>] sock_close+0xd/0x20
kernel: [<ffffffff9520de9d>] __fput+0x9d/0x1e0
kernel: [<ffffffff9520e019>] ____fput+0x9/0x10
kernel: [<ffffffff950e0ddb>] task_work_run+0x7b/0xa0
kernel: [<ffffffff950c72f9>] do_exit+0x2e9/0xb30
kernel: [<ffffffff950d2779>] ? get_signal+0xa9/0x720
kernel: [<ffffffff950c7bc0>] do_group_exit+0x40/0xc0
kernel: [<ffffffff950d298b>] get_signal+0x2bb/0x720
kernel: [<ffffffff9502ce23>] do_signal+0x23/0x620
kernel: [<ffffffff950033d5>] exit_to_usermode_loop+0x75/0x90
kernel: [<ffffffff95003962>] syscall_return_slowpath+0x62/0x70
kernel: [<ffffffff9594ba49>] entry_SYSCALL_64_fastpath+0xac/0xae
kernel: Code: 5d c3 0f 1f 00 55 48 89 e5 41 57 41 89 f7 41 56 41 55 41 54 4c 8d 67 38 53 48 83 ec 10 89 55 cc 48 8b 57 38 4c 89 45 d0 49 39 d4 <48> 8b 32 74 40 48 8d 42 e8 41 89 ce 4c 8d 6e e8 8b 18 44 89 f2 
kernel: RIP  [<ffffffff95104a76>] __wake_up_common+0x26/0x80
kernel: RSP <ffffb3170a3b7ae8>
kernel: CR2: ffffb31700eafcd8
kernel: ---[ end trace b8fb7bade0b2bc47 ]---
kernel: Fixing recursive fault but reboot is needed!
kernel: BUG: scheduling while atomic: aqueue:src/25840/0x00000002
kernel: INFO: lockdep is turned off.
kernel: Modules linked in: ip6t_REJECT nf_reject_ipv6 tun nfnetlink_queue nfnetlink_log snd_seq_dummy nls_utf8 nls_iso8859_1 nls_cp437 vfat fat uas usb_storage sctp_diag sctp dccp_diag dccp tcp_cdg tcp_cubic fuse nf_conntrack_netlink nfnetlink_acct ip6table_mangle nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6t_rt ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat iptable_raw xt_mark xt_connmark iptable_mangle ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_length xt_limit xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_connlimit xt_owner xt_hashlimit xt_multiport xt_conntrack nf_conntrack xt_set iptable_filter ip_set_hash_net ip_set nfnetlink cls_fw sch_pie sch_htb arptable_filter arp_tables cfg80211 w83627ehf hwmon_vid coretemp hwmon
kernel: kvm_intel iTCO_wdt iTCO_vendor_support btusb kvm btrtl btbcm mxm_wmi btintel bluetooth irqbypass rfkill snd_hda_codec_hdmi i2c_i801 snd_hda_codec_realtek i2c_smbus snd_hda_codec_generic lpc_ich snd_hda_intel snd_hda_codec snd_hda_core battery rtc_cmos acpi_cpufreq sch_fq_codel tcp_bbr binfmt_misc snd_pcm_oss snd_seq snd_seq_device snd_pcm snd_timer ip_tables x_tables algif_skcipher af_alg usbhid r8169 mii xhci_pci xhci_hcd i915 e1000e ehci_pci ptp ehci_hcd usbcore pps_core usb_common video fjes wmi button 8021q mrp scsi_transport_iscsi sunrpc snd_mixer_oss snd soundcore analog gameport joydev i2c_dev ecryptfs autofs4 [last unloaded: pcspkr]
kernel: CPU: 2 PID: 25840 Comm: aqueue:src Tainted: G      D         4.9.9+ #88
kernel: Hardware name: System manufacturer System Product Name/P8Z68-V PRO GEN3, BIOS 3402 05/07/2012
kernel: ffffb3170a3b7e50 ffffffff954631a0 ffff93180682d400 0000000000000000
kernel: ffffb3170a3b7e68 ffffffff950e9f6b ffff93180682d400 ffffb3170a3b7ec0
kernel: ffffffff95945ef3 ffffb3170a3b7ed8 00ffffff951992b1 0000000000000008
kernel: Call Trace:
kernel: [<ffffffff954631a0>] dump_stack+0x63/0x83
kernel: [<ffffffff950e9f6b>] __schedule_bug+0x5b/0x80
kernel: [<ffffffff95945ef3>] __schedule+0x593/0x8f0
kernel: [<ffffffff95946288>] schedule+0x38/0x90
kernel: [<ffffffff950c7930>] do_exit+0x920/0xb30
kernel: [<ffffffff9594dd07>] rewind_stack_do_exit+0x17/0x20
systemd: systemd-udevd.service: State 'stop-sigterm' timed out. Killing.

kernel: sysrq: SysRq : Show Blocked State
kernel:  task                        PC stack   pid father
kernel: systemd-udevd   D    0 14385      1 0x00000004
kernel: ffff931964620500 ffff931a1f119398 ffff931a1f119380 ffff9316b40baa00
kernel: ffff931901152a00 ffffb317005339f8 ffffffff95945b87 ffffffff9594af6e
kernel: 00ff931901152a00 ffff931a1f119398 ffff931a066eee00 ffff931901152a00
kernel: Call Trace:
kernel: [<ffffffff95945b87>] ? __schedule+0x227/0x8f0
kernel: [<ffffffff9594af6e>] ? _raw_spin_lock_irqsave+0x4e/0x60
kernel: [<ffffffff95946288>] schedule+0x38/0x90
kernel: [<ffffffff9594a24c>] schedule_timeout+0x1cc/0x400
kernel: [<ffffffff95128250>] ? del_timer_sync+0xb0/0xb0
kernel: [<ffffffff9594a4da>] schedule_timeout_uninterruptible+0x1a/0x20
kernel: [<ffffffff95397bac>] xfs_iget+0x1ac/0xbb0
kernel: [<ffffffff95397bac>] ? xfs_iget+0x1ac/0xbb0
kernel: [<ffffffff953a1bd2>] xfs_lookup+0x92/0x170
kernel: [<ffffffff9539e097>] xfs_vn_lookup+0x47/0x80
kernel: [<ffffffff952169bf>] lookup_slow+0xff/0x1e0
kernel: [<ffffffff9521a5b8>] walk_component+0x1b8/0x270
kernel: [<ffffffff9521ad72>] path_lookupat+0x62/0x120
kernel: [<ffffffff9521c4e9>] filename_lookup+0x99/0x150
kernel: [<ffffffff95208daf>] ? __check_object_size+0x4f/0x1e0
kernel: [<ffffffff954989bd>] ? strncpy_from_user+0x4d/0x160
kernel: [<ffffffff9521c641>] user_path_at_empty+0x31/0x40
kernel: [<ffffffff9521137e>] vfs_fstatat+0x4e/0xa0
kernel: [<ffffffff952117ff>] SyS_newstat+0x1f/0x40
kernel: [<ffffffff95002e36>] ? lockdep_sys_exit_thunk+0x16/0x18
kernel: [<ffffffff9594b9b7>] entry_SYSCALL_64_fastpath+0x1a/0xae
kernel: aqueue:src      D    0 25840   6450 0x00000006
kernel: 0000000000000000 ffff931a1f119398 ffff931a1f119380 ffff931902401500
kernel: ffff93180682d400 ffffb3170a3b7ec0 ffffffff95945b87 ffffb3170a3b7ed8
kernel: 00ffffff951992b1 ffff931a1f119398 ffff931a060bf300 ffff93180682d400
kernel: Call Trace:
kernel: [<ffffffff95945b87>] ? __schedule+0x227/0x8f0
kernel: [<ffffffff95946288>] schedule+0x38/0x90
kernel: [<ffffffff950c7930>] do_exit+0x920/0xb30
kernel: [<ffffffff9594dd07>] rewind_stack_do_exit+0x17/0x20

kernel: INFO: rcu_preempt detected stalls on CPUs/tasks:
kernel: #011Tasks blocked on level-0 rcu_node (CPUs 0-3): P25840
kernel: #011(detected by 1, t=240007 jiffies, g=7792028, c=7792027, q=14237)
kernel: aqueue:src      D    0 25840   6450 0x00000006
kernel: 0000000000000000 ffff931a1f119398 ffff931a1f119380 ffff931902401500
kernel: ffff93180682d400 ffffb3170a3b7ec0 ffffffff95945b87 ffffb3170a3b7ed8
kernel: 00ffffff951992b1 ffff931a1f119398 ffff931a060bf300 ffff93180682d400
kernel: Call Trace:
kernel: [<ffffffff95945b87>] ? __schedule+0x227/0x8f0
kernel: [<ffffffff95946288>] schedule+0x38/0x90
kernel: [<ffffffff950c7930>] do_exit+0x920/0xb30
kernel: [<ffffffff9594dd07>] rewind_stack_do_exit+0x17/0x20
kernel: aqueue:src      D    0 25840   6450 0x00000006
kernel: 0000000000000000 ffff931a1f119398 ffff931a1f119380 ffff931902401500
kernel: ffff93180682d400 ffffb3170a3b7ec0 ffffffff95945b87 ffffb3170a3b7ed8
kernel: 00ffffff951992b1 ffff931a1f119398 ffff931a060bf300 ffff93180682d400
kernel: Call Trace:
kernel: [<ffffffff95945b87>] ? __schedule+0x227/0x8f0
kernel: [<ffffffff95946288>] schedule+0x38/0x90
kernel: [<ffffffff950c7930>] do_exit+0x920/0xb30
kernel: [<ffffffff9594dd07>] rewind_stack_do_exit+0x17/0x20

kernel: sysrq: SysRq : Show Memory
kernel: Mem-Info:
kernel: active_anon:760546 inactive_anon:145296 isolated_anon:0#012 active_file:1493159 inactive_file:1426097 isolated_file:0#012 unevictable:16 dirty:10668 writeback:0 unstable:0#012 slab_reclaimable:81827 slab_unreclaimable:34166#012 mapped:164434 shmem:151481 pagetables:17515 bounce:0#012 free:72807 free_pcp:533 free_cma:0
kernel: Node 0 active_anon:3042184kB inactive_anon:581184kB active_file:5972636kB inactive_file:5704388kB unevictable:64kB isolated(anon):0kB isolated(file):0kB mapped:657736kB dirty:42672kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 741376kB anon_thp: 605924kB writeback_tmp:0kB unstable:0kB pages_scanned:0 all_unreclaimable? no
kernel: DMA free:15308kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15976kB managed:15360kB mlocked:0kB slab_reclaimable:0kB slab_unreclaimable:52kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
kernel: lowmem_reserve[]: 0 3036 15516 15516
kernel: DMA32 free:208104kB min:13208kB low:16508kB high:19808kB active_anon:818628kB inactive_anon:22124kB active_file:1107768kB inactive_file:1220324kB unevictable:0kB writepending:37504kB present:3558944kB managed:3493376kB mlocked:0kB slab_reclaimable:90628kB slab_unreclaimable:8416kB kernel_stack:944kB pagetables:3328kB bounce:0kB free_pcp:1156kB local_pcp:692kB free_cma:0kB
kernel: lowmem_reserve[]: 0 0 12480 12480
kernel: Normal free:67816kB min:54304kB low:67880kB high:81456kB active_anon:2223556kB inactive_anon:559060kB active_file:4864868kB inactive_file:4484064kB unevictable:64kB writepending:5168kB present:13096960kB managed:12781688kB mlocked:64kB slab_reclaimable:236680kB slab_unreclaimable:128196kB kernel_stack:12720kB pagetables:66732kB bounce:0kB free_pcp:976kB local_pcp:608kB free_cma:0kB
kernel: lowmem_reserve[]: 0 0 0 0
kernel: DMA: 1*4kB (U) 1*8kB (U) 0*16kB 0*32kB 1*64kB (U) 1*128kB (U) 1*256kB (U) 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 15308kB
kernel: DMA32: 1013*4kB (UE) 1185*8kB (UE) 1183*16kB (UME) 687*32kB (UE) 595*64kB (UME) 288*128kB (UE) 93*256kB (UME) 41*512kB (UME) 33*1024kB (U) 0*2048kB 0*4096kB = 207980kB
kernel: Normal: 2978*4kB (UEH) 4918*8kB (UMEH) 933*16kB (UMH) 27*32kB (UMEH) 12*64kB (MH) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 67816kB
kernel: Node 0 hugepages_total=32 hugepages_free=32 hugepages_surp=0 hugepages_size=2048kB
kernel: 3070742 total pagecache pages
kernel: 0 pages in swap cache
kernel: Swap cache stats: add 0, delete 0, find 0/0
kernel: Free swap  = 0kB
kernel: Total swap = 0kB
kernel: 4167970 pages RAM
kernel: 0 pages HighMem/MovableOnly
kernel: 95364 pages reserved


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