linux-ext4 - [Bug 216529] [fstests generic/048] BUG: Kernel NULL pointer dereference at 0x00000069, filemap_release

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Date:   Tue, 27 Sep 2022 00:47:02 +0000
From:   bugzilla-daemon@...nel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 216529] [fstests generic/048] BUG: Kernel NULL pointer
 dereference at 0x00000069, filemap_release_folio+0x88/0xb0

https://bugzilla.kernel.org/show_bug.cgi?id=216529

--- Comment #2 from Zorro Lang (zlang@...hat.com) ---
(In reply to Theodore Tso from comment #1)
> On Sun, Sep 25, 2022 at 11:55:29AM +0000, bugzilla-daemon@...nel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=216529
> > 
> > 
> > Hit a panic on ppc64le, by running generic/048 with 1k block size:
> 
> Hmm, does this reproduce reliably for you?  I test with a 1k block
> size on x86_64 as a proxy 4k block sizes on PPC64, where the blocksize
> < pagesize... and this isn't reproducing for me on x86, and I don't
> have access to a PPC64LE system.

Hi Ted,

Yes, it's reproducible for me, I just reproduced it again on another ppc64le
(P8) machine [1]. But it's not easy to reproduce by running generic/048 (maybe
there's a better way to reproduce it).

And this time the call trace is a little different, it might be a folio [mm]
related bug? Maybe I should cc linux-mm list to get more checking?

Thanks,
Zorro

[ 1254.857035] run fstests generic/048 at 2022-09-26 12:12:26 
[ 1257.651002] EXT4-fs (sda3): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1257.666754] EXT4-fs (sda3): shut down requested (1) 
[ 1257.666773] Aborting journal on device sda3-8. 
[ 1257.696046] EXT4-fs (sda3): unmounting filesystem. 
[ 1259.216580] EXT4-fs (sda3): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1273.042962] restraintd[2251]: *** Current Time: Mon Sep 26 12:12:45 2022 
Localwatchdog at: Wed Sep 28 11:54:44 2022 
[ 1333.319238] restraintd[2251]: *** Current Time: Mon Sep 26 12:13:45 2022 
Localwatchdog at: Wed Sep 28 11:54:44 2022 
[ 1394.828503] restraintd[2251]: *** Current Time: Mon Sep 26 12:14:47 2022 
Localwatchdog at: Wed Sep 28 11:54:44 2022 
[ 1403.799008] BUG: Kernel NULL pointer dereference at 0x00000062 
[ 1403.799218] Faulting instruction address: 0xc00000000068edfc 
[ 1403.799228] Oops: Kernel access of bad area, sig: 11 [#1] 
[ 1403.799233] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries 
[ 1403.799241] Modules linked in: ext4 mbcache jbd2 bonding tls rfkill sunrpc
pseries_rng drm fuse drm_panel_orientation_quirks xfs libcrc32c sd_mod t10_pi
sg ibmvscsi ibmveth scsi_transport_srp vmx_crypto 
[ 1403.799280] CPU: 4 PID: 82 Comm: kswapd0 Kdump: loaded Not tainted 6.0.0-rc7
#1 
[ 1403.799293] NIP:  c00000000068edfc LR: c00000000068f2a8 CTR:
0000000000000000 
[ 1403.799300] REGS: c00000000a44b560 TRAP: 0380   Not tainted  (6.0.0-rc7) 
[ 1403.799308] MSR:  800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR:
28028244  XER: 00000001 
[ 1403.799327] CFAR: c00000000068ede4 IRQMASK: 0  
[ 1403.799327] GPR00: c00000000068f2a8 c00000000a44b800 c000000002cf1700
c00c0000001c0bc0  
[ 1403.799327] GPR04: c00000000a44b860 0000000000000002 00000003fb290000
c000000002de7dc8  
[ 1403.799327] GPR08: 0000000ae4f08f42 0000000000000000 c00c0000001c0bc0
0000000000008000  
[ 1403.799327] GPR12: 00000003fb290000 c00000000ffcc080 c000000000194288
c0000003fff9c480  
[ 1403.799327] GPR16: c000000069d30050 0000000000000007 0000000000000000
0000000000000000  
[ 1403.799327] GPR20: 0000000000000001 c00000000a44b8f8 c00000000146bad8
5deadbeef0000100  
[ 1403.799327] GPR24: 5deadbeef0000122 c000000069d30000 c00000000a44bc00
c00000000a44b8e8  
[ 1403.799327] GPR28: c00000000a44b860 c00c0000001c0bc0 0000000000000002
0000000000000002  
[ 1403.799413] NIP [c00000000068edfc] drop_buffers.constprop.0+0x4c/0x1c0 
[ 1403.799423] LR [c00000000068f2a8] try_to_free_buffers+0x128/0x150 
[ 1403.799431] Call Trace: 
[ 1403.799434] [c00000000a44b840] [c00000000a44bc00] 0xc00000000a44bc00 
[ 1403.799443] [c00000000a44b890] [c0000000004986f8]
filemap_release_folio+0x88/0xb0 
[ 1403.799452] [c00000000a44b8b0] [c0000000004c51b0]
shrink_active_list+0x490/0x750 
[ 1403.799462] [c00000000a44b9b0] [c0000000004c9f78] shrink_lruvec+0x3f8/0x430 
[ 1403.799470] [c00000000a44baa0] [c0000000004ca1e4]
shrink_node_memcgs+0x234/0x290 
[ 1403.799478] [c00000000a44bb10] [c0000000004ca3b4] shrink_node+0x174/0x6b0 
[ 1403.799486] [c00000000a44bbc0] [c0000000004cace0] balance_pgdat+0x3f0/0x970 
[ 1403.799494] [c00000000a44bd20] [c0000000004cb430] kswapd+0x1d0/0x450 
[ 1403.799501] [c00000000a44bdc0] [c0000000001943c8] kthread+0x148/0x150 
[ 1403.799510] [c00000000a44be10] [c00000000000cbe4]
ret_from_kernel_thread+0x5c/0x64 
[ 1403.799520] Instruction dump: 
[ 1403.799525] fbc1fff0 f821ffc1 7c7d1b78 7c9c2378 ebc30028 7fdff378 48000018
60000000  
[ 1403.799540] 60000000 ebff0008 7c3ef840 41820048 <815f0060> e93f0000 5529077c
7d295378  
[ 1403.799554] ---[ end trace 0000000000000000 ]--- 
[ 1403.806330]  
[-- MARK -- Mon Sep 26 16:15:00 2022] 
[ 1415.093395] EXT4-fs (sda3): shut down requested (2) 
[ 1415.093410] Aborting journal on device sda3-8. 
[ 1429.107188] EXT4-fs (sda3): unmounting filesystem. 
[ 1429.926262] EXT4-fs (sda3): recovery complete 
[ 1429.983938] EXT4-fs (sda3): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1429.988189] EXT4-fs (sda3): unmounting filesystem. 
[ 1430.166549] EXT4-fs (sda3): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1453.015796] restraintd[2251]: *** Current Time: Mon Sep 26 12:15:45 2022 
Localwatchdog at: Wed Sep 28 11:54:44 2022 
[ 1454.708150] EXT4-fs (sda5): unmounting filesystem. 
[ 1455.225112] EXT4-fs (sda3): unmounting filesystem. 
[ 1456.128026] EXT4-fs (sda3): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1456.139102] EXT4-fs (sda3): unmounting filesystem. 
[ 1456.396367] EXT4-fs (sda5): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1462.317449] EXT4-fs (sda3): mounted filesystem with ordered data mode. Quota
mode: none. 
[ 1462.326680] EXT4-fs (sda3): unmounting filesystem. 
[ 1462.427320] EXT4-fs (sda5): unmounting filesystem. 
[ 1463.259690] EXT4-fs (sda5): mounted filesystem with ordered data mode. Quota
mode: none. 


> 
> Ritesh, is this something you can take a look at it?  Thanks!
> 
>                                      - Ted

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