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From:   Uladzislau Rezki <urezki@gmail.com>
Date:   Fri, 26 May 2023 14:24:56 +0200
To:     Forza <forza@tnonline.net>, Bagas Sanjaya <bagasdotme@gmail.com>
Cc:     Forza <forza@tnonline.net>, Uladzislau Rezki <urezki@gmail.com>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
        Linux btrfs <linux-btrfs@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Stable <stable@vger.kernel.org>,
        Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>,
        David Sterba <dsterba@suse.com>, a1bert@atlas.cz
Subject: Re: Fwd: vmalloc error: btrfs-delalloc btrfs_work_helper [btrfs] in
 kernel 6.3.x
Message-ID: <ZHClGA9szxSqzDf8@pc636>
References: <efa04d56-cd7f-6620-bca7-1df89f49bf4b@gmail.com>
 <fcf1d04.faed4a1a.18844d8e78f@tnonline.net>
 <ZGwcVTpQNBoJHBB+@debian.me>
 <ZGyVVQxnw6Tn7Xb8@pc636>
 <c9db92d.faed4a1c.1884c5550fb@tnonline.net>
 <20230524091357.GH32559@suse.cz>
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In-Reply-To: <20230524091357.GH32559@suse.cz>
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On Wed, May 24, 2023 at 11:13:57AM +0200, David Sterba wrote:
> This looks like a different set of problems, though all of them seem to
> start on the compression write path in btrfs.
> 
> On Wed, May 24, 2023 at 07:57:19AM +0200, Forza wrote:
> > [   8.641506] 8021q: adding VLAN 0 to HW filter on device enp4s0
> > [   13.841691] wireguard: WireGuard 1.0.0 loaded. See www.wireguard.com for information.
> > [   13.841705] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
> > [13917.280527] ------------[ cut here ]------------
> > [13917.280753] default_enter_idle leaked IRQ state
> > [13917.281004] WARNING: CPU: 3 PID: 0 at drivers/cpuidle/cpuidle.c:269 cpuidle_enter_state+0x3bb/0x430
> 
> Warning in cpuilde
> 
> > [13917.281046] Modules linked in: wireguard curve25519_x86_64 libcurve25519_generic ip6_udp_tunnel udp_tunnel cfg80211 rfkill 8021q garp mrp stp llc binfmt_misc intel_rapl_msr intel_rapl_common kvm_amd iTCO_wdt ccp intel_pmc_bxt iTCO_vendor_support kvm i2c_i801 virtio_gpu irqbypass pcspkr virtio_dma_buf joydev i2c_smbus drm_shmem_helper lpc_ich virtio_balloon drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic ghash_clmulni_intel sha512_ssse3 virtio_console virtio_net net_failover virtio_scsi failover serio_raw virtio_blk qemu_fw_cfg
> > [13917.281140] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.3.1-gentoo-mm-patched #4
> > [13917.281150] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-20220807_005459-localhost 04/01/2014
> > [13917.281154] RIP: 0010:cpuidle_enter_state+0x3bb/0x430
> > [13917.281176] RSP: 0018:ffffa153c00b7ea0 EFLAGS: 00010286
> > [13917.281182] RAX: ffff8c15ebfafa28 RBX: ffffc153bfd80900 RCX: 000000000000083f
> > [13917.281186] RDX: 000000000118feed RSI: 00000000000000f6 RDI: 000000000000083f
> > [13917.281189] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffa153c00b7d60
> > [13917.281193] R10: 0000000000000003 R11: ffffffffacb399e8 R12: ffffffffacc2e320
> > [13917.281196] R13: ffffffffacc2e3a0 R14: 0000000000000001 R15: 0000000000000000
> > [13917.281202] FS:  0000000000000000(0000) GS:ffff8c15ebf80000(0000) knlGS:0000000000000000
> > [13917.281206] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [13917.281210] CR2: 00007f71840b39c8 CR3: 0000000102998000 CR4: 00000000003506e0
> > [13917.281217] Call Trace:
> > [13917.281221]  <TASK>
> > [13917.281228]  cpuidle_enter+0x29/0x40
> > [13917.281244]  do_idle+0x19b/0x200
> > [13917.281292]  cpu_startup_entry+0x19/0x20
> > [13917.281297]  start_secondary+0x101/0x120
> > [13917.281324]  secondary_startup_64_no_verify+0xe5/0xeb
> > [13917.281343]  </TASK>
> > [13917.281346] ---[ end trace 0000000000000000 ]---
> > [17206.750165] BTRFS info (device vdb): using xxhash64 (xxhash64-generic) checksum algorithm
> > [17206.750190] BTRFS info (device vdb): using free space tree
> > [17206.904010] BTRFS info (device vdb): auto enabling async discard
> > [17206.933302] BTRFS info (device vdb): checking UUID tree
> > [17344.541839] sched: RT throttling activated
> > [18284.216538] hrtimer: interrupt took 23434934 ns
> > [18737.100477] BUG: unable to handle page fault for address: 0000000079e0afc0
> 
> BUG
> 
> > [18737.100883] #PF: supervisor read access in kernel mode
> > [18737.101155] #PF: error_code(0x0000) - not-present page
> > [18737.101462] PGD 0 P4D 0 
> > [18737.101715] Oops: 0000 [#1] PREEMPT SMP NOPTI
> > [18737.101968] CPU: 1 PID: 25287 Comm: kworker/u8:7 Tainted: G        W          6.3.1-gentoo-mm-patched #4
> > [18737.102391] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-20220807_005459-localhost 04/01/2014
> > [18737.102860] Workqueue: btrfs-delalloc btrfs_work_helper
> > [18737.103346] RIP: 0010:find_free_extent+0x20a/0x15c0
> > [18737.103900] Code: 4d 8d ba 10 ff ff ff 48 83 c0 0f 49 8d 97 f0 00 00 00 48 c1 e0 04 48 01 d8 48 39 c2 0f 84 c5 03 00 00 41 c6 85 84 00 00 00 00 <45> 8b 9f b0 00 00 00 45 85 db 0f 85 d8 0c 00 00 45 8b 75 28 4c 89
> > [18737.104851] RSP: 0018:ffffa153c0923bd0 EFLAGS: 00010203
> > [18737.105456] RAX: ffff8c14869240f0 RBX: ffff8c1486924000 RCX: 0000000000000001
> > [18737.106044] RDX: 0000000079e0b000 RSI: 0000000000000100 RDI: ffff8c14869bcc00
> > [18737.106519] RBP: ffff8c148b100000 R08: 0000000000000000 R09: 0000000000000000
> > [18737.107036] R10: 0000000079e0b000 R11: 000000000000151b R12: ffffa153c0923dd7
> > [18737.107363] R13: ffffa153c0923c90 R14: 0000000000000001 R15: 0000000079e0af10
> > [18737.107676] FS:  0000000000000000(0000) GS:ffff8c15ebe80000(0000) knlGS:0000000000000000
> > [18737.107971] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [18737.108260] CR2: 0000000079e0afc0 CR3: 00000001055e8000 CR4: 00000000003506e0
> > [18737.108606] Call Trace:
> > [18737.108964]  <TASK>
> > [18737.109273]  btrfs_reserve_extent+0x148/0x260
> > [18737.109601]  submit_compressed_extents+0x14f/0x490
> > [18737.109934]  async_cow_submit+0x37/0x90
> > [18737.110237]  btrfs_work_helper+0x13d/0x360
> > [18737.110542]  process_one_work+0x20f/0x410
> > [18737.110883]  worker_thread+0x4a/0x3b0
> > [18737.111185]  ? __pfx_worker_thread+0x10/0x10
> > [18737.111482]  kthread+0xda/0x100
> > [18737.111800]  ? __pfx_kthread+0x10/0x10
> > [18737.112097]  ret_from_fork+0x2c/0x50
> > [18737.112387]  </TASK>
> > [18737.112676] Modules linked in: wireguard curve25519_x86_64 libcurve25519_generic ip6_udp_tunnel udp_tunnel cfg80211 rfkill 8021q garp mrp stp llc binfmt_misc intel_rapl_msr intel_rapl_common kvm_amd iTCO_wdt ccp intel_pmc_bxt iTCO_vendor_support kvm i2c_i801 virtio_gpu irqbypass pcspkr virtio_dma_buf joydev i2c_smbus drm_shmem_helper lpc_ich virtio_balloon drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic ghash_clmulni_intel sha512_ssse3 virtio_console virtio_net net_failover virtio_scsi failover serio_raw virtio_blk qemu_fw_cfg
> > [18737.114021] CR2: 0000000079e0afc0
> > [18737.114366] ---[ end trace 0000000000000000 ]---
> > [18737.114712] RIP: 0010:find_free_extent+0x20a/0x15c0
> > [18737.115059] Code: 4d 8d ba 10 ff ff ff 48 83 c0 0f 49 8d 97 f0 00 00 00 48 c1 e0 04 48 01 d8 48 39 c2 0f 84 c5 03 00 00 41 c6 85 84 00 00 00 00 <45> 8b 9f b0 00 00 00 45 85 db 0f 85 d8 0c 00 00 45 8b 75 28 4c 89
> > [18737.115864] RSP: 0018:ffffa153c0923bd0 EFLAGS: 00010203
> > [18737.116415] RAX: ffff8c14869240f0 RBX: ffff8c1486924000 RCX: 0000000000000001
> > [18737.117090] RDX: 0000000079e0b000 RSI: 0000000000000100 RDI: ffff8c14869bcc00
> > [18737.117882] RBP: ffff8c148b100000 R08: 0000000000000000 R09: 0000000000000000
> > [18737.118611] R10: 0000000079e0b000 R11: 000000000000151b R12: ffffa153c0923dd7
> > [18737.119416] R13: ffffa153c0923c90 R14: 0000000000000001 R15: 0000000079e0af10
> > [18737.120221] FS:  0000000000000000(0000) GS:ffff8c15ebe80000(0000) knlGS:0000000000000000
> > [18737.120994] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [18737.121868] CR2: 0000000079e0afc0 CR3: 00000001055e8000 CR4: 00000000003506e0
> > [18737.122624] note: kworker/u8:7[25287] exited with irqs disabled
> > [19006.920558] BUG: unable to handle page fault for address: 0000000079e0afc0
> 
> And again, so something is going wrong
> 
Indeed.

I suggest you run your kernel with CONFIG_KASAN=y to see if there are
any use-after-free or out-of-bounds bugs.

--
Uladzislau Rezki