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From: Naresh Kamboju <naresh.kamboju@linaro.org>
Date: Wed, 28 Feb 2024 23:49:34 +0530
Message-ID: <CA+G9fYvnjDcmVBPwbPwhFDMewPiFj6z69iiPJrjjCP4Z7Q4AbQ@mail.gmail.com>
Subject: fs: ext4_mballoc_test: Internal error: Oops: map_id_range_down (kernel/user_namespace.c:318)
To: open list <linux-kernel@vger.kernel.org>, linux-ext4 <linux-ext4@vger.kernel.org>, 
	linux-fsdevel@vger.kernel.org, lkft-triage@lists.linaro.org
Cc: Jan Kara <jack@suse.cz>, Andreas Dilger <adilger.kernel@dilger.ca>, 
	"Theodore Ts'o" <tytso@mit.edu>, Christian Brauner <brauner@kernel.org>, Randy Dunlap <rdunlap@infradead.org>, 
	shikemeng@huaweicloud.com, Arnd Bergmann <arnd@arndb.de>, 
	Dan Carpenter <dan.carpenter@linaro.org>
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Kunit ext4_mballoc_test tests found following kernel oops on Linux next.
All ways reproducible on all the architectures and steps to reproduce shared
in the bottom of this email.

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

Test log:
---------
<6>[   14.297909]     KTAP version 1
<6>[   14.298306]     # Subtest: ext4_mballoc_test
<6>[   14.299114]     # module: ext4
<6>[   14.300048]     1..6
<6>[   14.301204]         KTAP version 1
<6>[   14.301853]         # Subtest: test_new_blocks_simple
<1>[   14.308203] Unable to handle kernel paging request at virtual
address dfff800000000000
<1>[   14.309700] KASAN: null-ptr-deref in range
[0x0000000000000000-0x0000000000000007]
<1>[   14.310671] Mem abort info:
<1>[   14.311141]   ESR = 0x0000000096000004
<1>[   14.312969]   EC = 0x25: DABT (current EL), IL = 32 bits
<1>[   14.313566]   SET = 0, FnV = 0
<1>[   14.314228]   EA = 0, S1PTW = 0
<1>[   14.314750]   FSC = 0x04: level 0 translation fault
<1>[   14.316382] Data abort info:
<1>[   14.316838]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
<1>[   14.317742]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
<1>[   14.318637]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
<1>[   14.319975] [dfff800000000000] address between user and kernel
address ranges
<0>[   14.322307] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
<4>[   14.324184] Modules linked in:
<4>[   14.326693] CPU: 1 PID: 104 Comm: kunit_try_catch Tainted: G
            N 6.8.0-rc6-next-20240228 #1
<4>[   14.327913] Hardware name: linux,dummy-virt (DT)
<4>[   14.329173] pstate: 11400009 (nzcV daif +PAN -UAO -TCO +DIT
-SSBS BTYPE=--)
<4>[ 14.330117] pc : map_id_range_down (kernel/user_namespace.c:318)
<4>[ 14.331618] lr : make_kuid (kernel/user_namespace.c:415)
<trim>
<4>[   14.344145] Call trace:
<4>[ 14.344565] map_id_range_down (kernel/user_namespace.c:318)
<4>[ 14.345378] make_kuid (kernel/user_namespace.c:415)
<4>[ 14.345998] inode_init_always (include/linux/fs.h:1375 fs/inode.c:174)
<4>[ 14.346696] alloc_inode (fs/inode.c:268)
<4>[ 14.347353] new_inode_pseudo (fs/inode.c:1007)
<4>[ 14.348016] new_inode (fs/inode.c:1033)
<4>[ 14.348644] ext4_mb_init (fs/ext4/mballoc.c:3404 fs/ext4/mballoc.c:3719)
<4>[ 14.349312] mbt_kunit_init (fs/ext4/mballoc-test.c:57
fs/ext4/mballoc-test.c:314)
<4>[ 14.349983] kunit_try_run_case (lib/kunit/test.c:388 lib/kunit/test.c:443)
<4>[ 14.350696] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
<4>[ 14.351530] kthread (kernel/kthread.c:388)
<4>[ 14.352168] ret_from_fork (arch/arm64/kernel/entry.S:861)
<0>[ 14.353385] Code: 52808004 b8236ae7 72be5e44 b90004c4 (38e368a1)
All code
========
   0: 52808004 mov w4, #0x400                  // #1024
   4: b8236ae7 str w7, [x23, x3]
   8: 72be5e44 movk w4, #0xf2f2, lsl #16
   c: b90004c4 str w4, [x6, #4]
  10:* 38e368a1 ldrsb w1, [x5, x3] <-- trapping instruction

Code starting with the faulting instruction
===========================================
   0: 38e368a1 ldrsb w1, [x5, x3]
<4>[   14.354545] ---[ end trace 0000000000000000 ]---

Links:
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240228/testrun/22877850/suite/log-parser-test/test/check-kernel-bug/log
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240228/testrun/22877850/suite/log-parser-test/tests/
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240228/testrun/22877850/suite/log-parser-test/test/check-kernel-bug-43e0665fdb2d5768ac093e1634e6d9a7c65ff1b6a66af7d0c12b3bce5ca7e717/details/

Steps to reproduce:
 - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2czN4PCDk4BIKg76qUnQE4WkNny/reproducer

--
Linaro LKFT
https://lkft.linaro.org