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Sender: Guenter Roeck <groeck7@gmail.com>
Date:   Sat, 13 Aug 2022 08:58:51 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Cc:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Anup Patel <apatel@ventanamicro.com>,
        Atish Patra <atishp@rivosinc.com>, Guo Ren <guoren@kernel.org>,
        Mayuresh Chitale <mchitale@ventanamicro.com>,
        Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] riscv: enable Docker requirements in defconfig
Message-ID: <20220813155851.GA187510@roeck-us.net>
References: <20220608000251.55271-1-heinrich.schuchardt@canonical.com>
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In-Reply-To: <20220608000251.55271-1-heinrich.schuchardt@canonical.com>
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On Wed, Jun 08, 2022 at 02:02:51AM +0200, Heinrich Schuchardt wrote:
> The defconfig kernel should be able to run Docker.
> 
> Enable the missing settings according to [1].
> make savedefconfig eliminates CONFIG_STACKTRACE
> which is enabled by default.
> 
> Many of the settings are also needed to run a defconfig kernel
> on default distro installations or to run snaps.
> 
> [1] https://github.com/moby/moby/blob/master/contrib/check-config.sh
> 
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

This patch results in (or exposes) the following boot warning with all
riscv32 and riscv64 qemu boots.

[   12.278014] DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled())
[   12.278218] WARNING: CPU: 0 PID: 140 at kernel/locking/lockdep.c:5510 check_flags+0xe2/0x1c2
[   12.278446] Modules linked in:
[   12.278623] CPU: 0 PID: 140 Comm: S01syslogd Tainted: G                 N 5.19.0-14184-g69dac8e431af #1
[   12.278791] Hardware name: riscv-virtio,qemu (DT)
[   12.278931] epc : check_flags+0xe2/0x1c2
[   12.279024]  ra : check_flags+0xe2/0x1c2
[   12.279092] epc : ffffffff80a8ea50 ra : ffffffff80a8ea50 sp : ff200000107f3cb0
[   12.279180]  gp : ffffffff819fec50 tp : ff600000049895c0 t0 : ffffffff81833520
[   12.279287]  t1 : 0000000000000001 t2 : 2d2d2d2d2d2d2d2d s0 : ff200000107f3cd0
[   12.279395]  s1 : ffffffff81a00130 a0 : 0000000000000030 a1 : ffffffff818925e8
[   12.279502]  a2 : 0000000000000010 a3 : fffffffffffffffe a4 : 0000000000000000
[   12.279608]  a5 : 0000000000000000 a6 : ffffffff80066d80 a7 : 0000000000000038
[   12.279714]  s2 : ffffffff81a024e0 s3 : ffffffff818935b0 s4 : ff200000107f3e28
[   12.279825]  s5 : ffffffff80e27708 s6 : 0000000200000022 s7 : ffffffffffffffff
[   12.279932]  s8 : ffffffff8249da18 s9 : 0000000000001000 s10: 0000000000000001
[   12.280037]  s11: 0000000000000001 t3 : ffffffff824740af t4 : ffffffff824740af
[   12.280142]  t5 : ffffffff824740b0 t6 : ff200000107f3aa8
[   12.280227] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003
[   12.280382] [<ffffffff80a8eba8>] lock_is_held_type+0x78/0x14a
[   12.280505] [<ffffffff8003d648>] __might_resched+0x26/0x232
[   12.280608] [<ffffffff8003d892>] __might_sleep+0x3e/0x66
[   12.280690] [<ffffffff8002262c>] get_signal+0xa6/0x8f6
[   12.280771] [<ffffffff800051da>] do_notify_resume+0x68/0x418
[   12.280863] [<ffffffff80003af4>] ret_from_exception+0x0/0x10
[   12.280978] irq event stamp: 2900
[   12.281041] hardirqs last  enabled at (2899): [<ffffffff80a9761c>] _raw_spin_unlock_irqrestore+0x54/0x62
[   12.281176] hardirqs last disabled at (2900): [<ffffffff8000812c>] __trace_hardirqs_off+0xc/0x14
[   12.281303] softirqs last  enabled at (1860): [<ffffffff80a98092>] __do_softirq+0x3e2/0x51c
[   12.281435] softirqs last disabled at (1843): [<ffffffff80016fc8>] __irq_exit_rcu+0xb4/0xdc
[   12.281564] ---[ end trace 0000000000000000 ]---
[   12.281735] possible reason: unannotated irqs-on.
[   12.281815] irq event stamp: 2900
[   12.281875] hardirqs last  enabled at (2899): [<ffffffff80a9761c>] _raw_spin_unlock_irqrestore+0x54/0x62
[   12.282004] hardirqs last disabled at (2900): [<ffffffff8000812c>] __trace_hardirqs_off+0xc/0x14
[   12.282125] softirqs last  enabled at (1860): [<ffffffff80a98092>] __do_softirq+0x3e2/0x51c
[   12.282242] softirqs last disabled at (1843): [<ffffffff80016fc8>] __irq_exit_rcu+0xb4/0xdc

Reverting this patch fixes the problem. Bisect log attached.

Guenter

---
# bad: [69dac8e431af26173ca0a1ebc87054e01c585bcc] Merge tag 'riscv-for-linus-5.20-mw2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
# good: [6614a3c3164a5df2b54abb0b3559f51041cf705b] Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
git bisect start 'HEAD' '6614a3c3164a'
# bad: [24cb958695724ffb4488ef4f65892c0767bcd2f2] Merge tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
git bisect bad 24cb958695724ffb4488ef4f65892c0767bcd2f2
# good: [a3b5d4715fd5a839857f8b7be78dff258a8d5a47] Merge tag 'asoc-v5.20-2' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
git bisect good a3b5d4715fd5a839857f8b7be78dff258a8d5a47
# good: [1d239c1eb873c7d6c6cbc80d68330c939fd86136] Merge tag 'iommu-updates-v5.20-or-v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
git bisect good 1d239c1eb873c7d6c6cbc80d68330c939fd86136
# good: [4cfa6ff24a9744ba484521c38bea613134fbfcb3] powerpc/64e: Fix kexec build error
git bisect good 4cfa6ff24a9744ba484521c38bea613134fbfcb3
# good: [ea0c39260d0c1d8e11d89c9d42ca48e172d1c868] Merge tag '9p-for-5.20' of https://github.com/martinetd/linux
git bisect good ea0c39260d0c1d8e11d89c9d42ca48e172d1c868
# bad: [d77771c926671e0362af3fe792391be66072b242] Merge tag 'mips_6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
git bisect bad d77771c926671e0362af3fe792391be66072b242
# good: [3f1901110a89b0e2e13adb2ac8d1a7102879ea98] RISC-V: Add fast call path of crash_kexec()
git bisect good 3f1901110a89b0e2e13adb2ac8d1a7102879ea98
# good: [d3164e2f3b0ac003c401d419cda2da0571724352] MIPS: Remove VR41xx support
git bisect good d3164e2f3b0ac003c401d419cda2da0571724352
# good: [534ea58b3ceb41d668adf18c4e68a846e770a6c8] Revert "MIPS: octeon: Remove vestiges of CONFIG_CAVIUM_RESERVE32"
git bisect good 534ea58b3ceb41d668adf18c4e68a846e770a6c8
# bad: [ba6cfef057e1c594c456627aad81c2343fdb5d13] riscv: enable Docker requirements in defconfig
git bisect bad ba6cfef057e1c594c456627aad81c2343fdb5d13
# good: [9c2ea4a36364bfb5cf068c6fbea5c40292b119a5] riscv: convert the t-head pbmt errata to use the __nops macro
git bisect good 9c2ea4a36364bfb5cf068c6fbea5c40292b119a5
# good: [f4361718f7654f31fee6bf323147e7062d825599] riscv: Add macro for multiple nop instructions
git bisect good f4361718f7654f31fee6bf323147e7062d825599
# first bad commit: [ba6cfef057e1c594c456627aad81c2343fdb5d13] riscv: enable Docker requirements in defconfig