Re: BUG: KASAN: use-after-free in __list_add_valid+0x81/0xa0 (5.11-rc4)

[Mikhail Gavrilov]

On Tue, 26 Jan 2021 at 13:28, Hillf Danton <hdanton@xxxxxxxx> wrote:
>
>
> BTW better run the reproducer again with KASAN enabled.
>

It happened today again with kernel 5.11 rc7 (e0756cfc7d7c)
Why not try your patch?

list_del corruption, ffffdef70143e848->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
invalid opcode: 0000 [#1] SMP NOPTI
CPU: 13 PID: 263 Comm: kswapd0 Tainted: G        W        ---------
---  5.11.0-0.rc7.20210210gite0756cfc7d7c.150.fc35.x86_64 #1
Hardware name: System manufacturer System Product Name/ROG STRIX
X570-I GAMING, BIOS 3402 01/13/2021
RIP: 0010:__list_del_entry_valid.cold+0xf/0x47
Code: fe ff 0f 0b 48 89 d1 4c 89 c6 4c 89 ca 48 c7 c7 e0 26 64 9e e8
1b 12 fe ff 0f 0b 48 89 fe 48 c7 c7 70 27 64 9e e8 0a 12 fe ff <0f> 0b
48 c7 c7 20 28 64 9e e8 fc 11 fe ff 0f 0b 48 89 f2 48 89 fe
RSP: 0018:ffff9f2180863908 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff8f74d0fa1000 RCX: 0000000000000000
RDX: ffff8f7c885e9f60 RSI: ffff8f7c885db2a0 RDI: ffff8f7c885db2a0
RBP: ffff8f74d0fa1000 R08: 0000000000000000 R09: ffff9f2180863748
R10: ffff9f2180863740 R11: 0000000000000000 R12: ffff8f758edd8e00
R13: 0000000000012800 R14: ffffdef70143e840 R15: ffff8f758edd8e08
FS:  0000000000000000(0000) GS:ffff8f7c88400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000037203acb1000 CR3: 00000001d5c28000 CR4: 0000000000350ee0
Call Trace:
 z3fold_zpool_malloc+0x3e3/0x780
 ? _raw_spin_unlock+0x1f/0x30
 zswap_frontswap_store+0x43e/0x890
 __frontswap_store+0xc8/0x170
 swap_writepage+0x39/0x70
 pageout+0x125/0x540
 shrink_page_list+0x1329/0x1bc0
 shrink_inactive_list+0x12a/0x440
 shrink_lruvec+0x4a9/0x6d0
 ? super_cache_count+0x79/0xf0
 shrink_node+0x2d1/0x700
 balance_pgdat+0x2f5/0x650
 kswapd+0x21d/0x4d0
 ? do_wait_intr_irq+0xd0/0xd0
 ? balance_pgdat+0x650/0x650
 kthread+0x13a/0x150
 ? __kthread_bind_mask+0x60/0x60
 ret_from_fork+0x22/0x30
Modules linked in: tun snd_seq_dummy snd_hrtimer uinput rfcomm
nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet
nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4
nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat
ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw
iptable_security ip_set nf_tables nfnetlink ip6table_filter ip6_tables
iptable_filter cmac bnep zstd sunrpc vfat fat hid_logitech_hidpp
hid_logitech_dj snd_hda_codec_realtek snd_hda_codec_generic
ledtrig_audio snd_hda_codec_hdmi snd_hda_intel mt76x2u
snd_intel_dspcfg soundwire_intel mt76x2_common mt76x02_usb
soundwire_generic_allocation mt76_usb intel_rapl_msr iwlmvm
snd_soc_core snd_usb_audio intel_rapl_common mt76x02_lib mt76
snd_compress snd_pcm_dmaengine snd_usbmidi_lib soundwire_cadence
snd_rawmidi mac80211 snd_hda_codec joydev snd_hda_core uvcvideo
ac97_bus snd_hwdep btusb snd_seq
 videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 snd_seq_device
btrtl edac_mce_amd btbcm iwlwifi snd_pcm videobuf2_common btintel
kvm_amd eeepc_wmi snd_timer bluetooth kvm videodev asus_wmi snd
ecdh_generic sparse_keymap irqbypass xpad mc libarc4 sp5100_tco rapl
ff_memless cfg80211 wmi_bmof ecc video pcspkr soundcore k10temp
i2c_piix4 rfkill acpi_cpufreq binfmt_misc ip_tables amdgpu
drm_ttm_helper ttm iommu_v2 gpu_sched drm_kms_helper crct10dif_pclmul
crc32_pclmul crc32c_intel cec drm ghash_clmulni_intel igb ccp nvme dca
nvme_core i2c_algo_bit wmi pinctrl_amd fuse
---[ end trace a0c35e2a81af0791 ]---
RIP: 0010:__list_del_entry_valid.cold+0xf/0x47
Code: fe ff 0f 0b 48 89 d1 4c 89 c6 4c 89 ca 48 c7 c7 e0 26 64 9e e8
1b 12 fe ff 0f 0b 48 89 fe 48 c7 c7 70 27 64 9e e8 0a 12 fe ff <0f> 0b
48 c7 c7 20 28 64 9e e8 fc 11 fe ff 0f 0b 48 89 f2 48 89 fe
RSP: 0018:ffff9f2180863908 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff8f74d0fa1000 RCX: 0000000000000000
RDX: ffff8f7c885e9f60 RSI: ffff8f7c885db2a0 RDI: ffff8f7c885db2a0
RBP: ffff8f74d0fa1000 R08: 0000000000000000 R09: ffff9f2180863748
R10: ffff9f2180863740 R11: 0000000000000000 R12: ffff8f758edd8e00
R13: 0000000000012800 R14: ffffdef70143e840 R15: ffff8f758edd8e08
FS:  0000000000000000(0000) GS:ffff8f7c88400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000037203acb1000 CR3: 00000001d5c28000 CR4: 0000000000350ee0
note: kswapd0[263] exited with preempt_count 2


full kernel log: https://pastebin.com/FL1fZLJ0

-- 
Best Regards,
Mike Gavrilov.