Message-ID: <ZQZJtHHPZwCeQH9v@debian.me>
Date:   Sun, 17 Sep 2023 07:35:00 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Yi Zhang <yi.zhang@...hat.com>, Ming Lei <ming.lei@...hat.com>
Cc:     Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Changhui Zhong <czhong@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra (Intel) <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: Re: [czhong@...hat.com: [bug report] WARNING: CPU: 121 PID: 93233 at
 fs/dcache.c:365 __dentry_kill+0x214/0x278]

On Wed, Sep 13, 2023 at 04:59:31PM +0800, Yi Zhang wrote:
> The issue still can be reproduced on the latest linux tree[2].
> To reproduce I need to run about 1000 times blktests block/001, and
> bisect shows it was introduced with commit[1], as it was not 100%
> reproduced, not sure if it's the culprit?
> 
> 
> [1] 9257959a6e5b locking/atomic: scripts: restructure fallback ifdeffery
> [2]
> [ 2304.536339] scsi 48:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2304.540805] sr 50:0:0:0: Attached scsi CD-ROM sr3
> [ 2304.544574] scsi 48:0:0:0: Power-on or device reset occurred
> [ 2304.600645] sr 48:0:0:0: [sr1] scsi-1 drive
> [ 2304.616364] scsi 51:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2304.624639] scsi 51:0:0:0: Power-on or device reset occurred
> [ 2304.626634] sr 48:0:0:0: Attached scsi CD-ROM sr1
> [ 2304.680537] sr 51:0:0:0: [sr2] scsi-1 drive
> [ 2304.706394] sr 51:0:0:0: Attached scsi CD-ROM sr2
> [ 2304.746329] scsi 49:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2304.754569] scsi 49:0:0:0: Power-on or device reset occurred
> [ 2304.756302] scsi 50:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2304.768483] scsi 50:0:0:0: Power-on or device reset occurred
> [ 2304.806321] scsi 48:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2304.810587] sr 49:0:0:0: [sr0] scsi-1 drive
> [ 2304.814561] scsi 48:0:0:0: Power-on or device reset occurred
> [ 2304.824475] sr 50:0:0:0: [sr3] scsi-1 drive
> [ 2304.836384] scsi 51:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2304.840364] sr 49:0:0:0: Attached scsi CD-ROM sr0
> [ 2304.844619] scsi 51:0:0:0: Power-on or device reset occurred
> [ 2304.850444] sr 50:0:0:0: Attached scsi CD-ROM sr3
> [ 2304.874563] sr 48:0:0:0: [sr1] scsi-1 drive
> [ 2304.900660] sr 51:0:0:0: [sr2] scsi-1 drive
> [ 2304.901506] sr 48:0:0:0: Attached scsi CD-ROM sr1
> [ 2304.926306] sr 51:0:0:0: Attached scsi CD-ROM sr2
> [ 2305.056432] scsi 50:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2305.056572] scsi 49:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2305.064635] scsi 50:0:0:0: Power-on or device reset occurred
> [ 2305.072821] scsi 49:0:0:0: Power-on or device reset occurred
> [ 2305.086286] scsi 51:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2305.086357] scsi 48:0:0:0: CD-ROM            Linux    scsi_debug
>    0191 PQ: 0 ANSI: 7
> [ 2305.094521] scsi 51:0:0:0: Power-on or device reset occurred
> [ 2305.102693] scsi 48:0:0:0: Power-on or device reset occurred
> [ 2305.128785] sr 50:0:0:0: [sr0] scsi-1 drive
> [ 2305.134445] sr 49:0:0:0: [sr1] scsi-1 drive
> [ 2305.154728] sr 50:0:0:0: Attached scsi CD-ROM sr0
> [ 2305.158607] sr 51:0:0:0: [sr2] scsi-1 drive
> [ 2305.160392] sr 49:0:0:0: Attached scsi CD-ROM sr1
> [ 2305.164254] sr 48:0:0:0: [sr3] scsi-1 drive
> [ 2305.184185] sr 51:0:0:0: Attached scsi CD-ROM sr2
> [ 2305.190086] sr 48:0:0:0: Attached scsi CD-ROM sr3
> [ 2305.555658] Unable to handle kernel execute from non-executable
> memory at virtual address ffffc61b656052e8
> [ 2305.565301] Mem abort info:
> [ 2305.568086]   ESR = 0x000000008600000e
> [ 2305.571822]   EC = 0x21: IABT (current EL), IL = 32 bits
> [ 2305.577123]   SET = 0, FnV = 0
> [ 2305.580164]   EA = 0, S1PTW = 0
> [ 2305.583292]   FSC = 0x0e: level 2 permission fault
> [ 2305.588074] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000080731fa0000
> [ 2305.594761] [ffffc61b656052e8] pgd=1000080ffffff003,
> p4d=1000080ffffff003, pud=1000080fffffe003, pmd=0068080732e00f01
> [ 2305.605362] Internal error: Oops: 000000008600000e [#1] SMP
> [ 2305.610922] Modules linked in: scsi_debug sr_mod pktcdvd cdrom
> rfkill sunrpc vfat fat acpi_ipmi arm_spe_pmu ipmi_ssif ipmi_devintf
> ipmi_msghandler arm_cmn arm_dmc620_pmu arm_dsu_pmu cppc_cpufreq loop
> fuse zram xfs crct10dif_ce ghash_ce nvme sha2_ce nvme_core
> sha256_arm64 igb sha1_ce ast sbsa_gwdt nvme_common
> i2c_designware_platform i2c_algo_bit i2c_designware_core xgene_hwmon
> dm_mod [last unloaded: scsi_debug]
> [ 2305.647236] CPU: 85 PID: 1 Comm: systemd Kdump: loaded Not tainted
> 6.6.0-rc1+ #13
> [ 2305.654706] Hardware name: GIGABYTE R152-P31-00/MP32-AR1-00, BIOS
> F31n (SCP: 2.10.20220810) 09/30/2022
> [ 2305.663997] pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [ 2305.670946] pc : in_lookup_hashtable+0x1138/0x2000
> [ 2305.675728] lr : rcu_do_batch+0x194/0x488
> [ 2305.679727] sp : ffff8000802abe60
> [ 2305.683029] x29: ffff8000802abe60 x28: ffffc61b6524c7c0 x27: ffffc61b63452f40
> [ 2305.690152] x26: ffff080f37ab6438 x25: 000000000000000a x24: 0000000000000000
> [ 2305.697274] x23: 0000000000000002 x22: ffff8000802abec0 x21: ffff080f37ab63c0
> [ 2305.704396] x20: ffff07ff8136a580 x19: 0000000000000003 x18: 0000000000000000
> [ 2305.711519] x17: ffff41f3d3161000 x16: ffff8000802a8000 x15: 0000000000000000
> [ 2305.718641] x14: 0000000000000000 x13: ffff07ffa131802d x12: ffff80008041bb94
> [ 2305.725764] x11: 0000000000000040 x10: ffff07ff802622e8 x9 : ffffc61b63452e30
> [ 2305.732887] x8 : 000002189dce1780 x7 : ffff07ff8d5c1000 x6 : ffff41f3d3161000
> [ 2305.740009] x5 : ffff07ff8136a580 x4 : ffff080f37aba960 x3 : 000000001550a055
> [ 2305.747131] x2 : 0000000000000000 x1 : ffffc61b656052e8 x0 : ffff080184c565f0
> [ 2305.754254] Call trace:
> [ 2305.756687]  in_lookup_hashtable+0x1138/0x2000
> [ 2305.761119]  rcu_core+0x268/0x350
> [ 2305.764422]  rcu_core_si+0x18/0x30
> [ 2305.767812]  __do_softirq+0x120/0x3d4
> [ 2305.771462]  ____do_softirq+0x18/0x30
> [ 2305.775112]  call_on_irq_stack+0x24/0x30
> [ 2305.779022]  do_softirq_own_stack+0x24/0x38
> [ 2305.783192]  __irq_exit_rcu+0xfc/0x130
> [ 2305.786929]  irq_exit_rcu+0x18/0x30
> [ 2305.790404]  el1_interrupt+0x4c/0xe8
> [ 2305.793969]  el1h_64_irq_handler+0x18/0x28
> [ 2305.798052]  el1h_64_irq+0x78/0x80
> [ 2305.801441]  d_same_name+0x50/0xd0
> [ 2305.804832]  __lookup_slow+0x64/0x158
> [ 2305.808482]  walk_component+0xe0/0x1a0
> [ 2305.812219]  path_lookupat+0x7c/0x1b8
> [ 2305.815869]  filename_lookup+0xb4/0x1b8
> [ 2305.819692]  vfs_statx+0x94/0x1a8
> [ 2305.822995]  vfs_fstatat+0xd4/0x110
> [ 2305.826471]  __do_sys_newfstatat+0x58/0xa8
> [ 2305.830556]  __arm64_sys_newfstatat+0x28/0x40
> [ 2305.834901]  invoke_syscall.constprop.0+0x80/0xd8
> [ 2305.839592]  do_el0_svc+0x48/0xd0
> [ 2305.842894]  el0_svc+0x4c/0x1c0
> [ 2305.846023]  el0t_64_sync_handler+0x120/0x130
> [ 2305.850367]  el0t_64_sync+0x1a4/0x1a8
> [ 2305.854017] Code: 00000000 00000000 00000000 00000000 (84c565f1)
> [ 2305.860098] SMP: stopping secondary CPUs
> [ 2305.865048] Starting crashdump kernel...
> [ 2305.868958] Bye!
> 
> 

Please don't top-post; reply inline with appropriate context instead.

Anyway, thanks for bisecting this regression. I'm adding it to regzbot:

#regzbot ^introduced: 9257959a6e5b4f
#regzbot title: restructuring atomic locking conditionals causes vfs dentry lock protection failure

-- 
An old man doll... just what I always wanted! - Clara

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