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AJvYcCWAGo/ugjLTYU8vi1wEHKeKjgFPQIRT3Nlm3eqFHTMlB6aL8JX0cibGqgTsEQrJQmtIY6Yci/Do3s3JJFs=@vger.kernel.org X-Gm-Message-State: AOJu0YyCj1nqoEPBAetvfbm3t8SsEMoh9lNR+4bLM1IVLp/eyNY79yKZ qvRgAckBBRymKZ97/z2rHNU7ivdmqvVd+4mI8KTyC6ReX5xIep7otgGfqPjCnzqGFgkByuGdd+s HjHLze2nOKgIttu2L9kJUxMp+G1q1AP7qln2CIFYn6rVgUhfVFNoORSo= X-Google-Smtp-Source: AGHT+IHFSkC4mJvRLd1l6cWmhVvnv9f3tn2kYer9lnjWnNOXP7XH2ec45RZ5H7pHdpM/vuVPBqj+KPMYEJC0l9kiHWl4qQen32YZ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1d01:b0:3a3:b240:ff71 with SMTP id e9e14a558f8ab-3a4d5938519mr103662995ab.4.1729867022836; Fri, 25 Oct 2024 07:37:02 -0700 (PDT) Date: Fri, 25 Oct 2024 07:37:02 -0700 In-Reply-To: <8f093f2e-04ff-497d-b857-c328e4e6746a@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <671bad0e.050a0220.2e773.0006.GAE@google.com> Subject: Re: [syzbot] [erofs?] BUG: unable to handle kernel NULL pointer dereference in read_cache_folio From: syzbot To: gianf.trad@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: unable to handle kernel NULL pointer dereference in read_cache_folio Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000006 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault user pgtable: 4k pages, 52-bit VAs, pgdp=0000000045e33a80 [0000000000000000] pgd=080000004bfb6003, p4d=080000004bd49003, pud=080000004bde6003, pmd=0000000000000000 Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 UID: 0 PID: 3935 Comm: syz.0.15 Tainted: G B 6.12.0-rc4-syzkaller-gae90f6a6170d #0 Tainted: [B]=BAD_PAGE Hardware name: linux,dummy-virt (DT) pstate: 61400809 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=-c) pc : 0x0 lr : filemap_read_folio+0x44/0xf4 mm/filemap.c:2367 sp : ffff8000897b3ac0 x29: ffff8000897b3ac0 x28: fdf0000003bf9180 x27: 0000000020ffd000 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000002100cca x23: f6f0000003c63780 x22: 0000000000000000 x21: f6f0000003c63780 x20: 0000000000000000 x19: ffffc1ffc0354cc0 x18: ffff8000897b3c20 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000001 x14: 0000000000000000 x13: 0000000000000003 x12: 000000000006b8f7 x11: 0000000000000001 x10: ffff800081f1ae18 x9 : 0000000000000000 x8 : fff07ffffd1ef000 x7 : fff000007f8e9d58 x6 : 0000000000000001 x5 : ffffc1ffc0354cc0 x4 : 0000000000000000 x3 : fbf0000004756d80 x2 : 0000000000000000 x1 : ffffc1ffc0354cc0 x0 : f6f0000003c63780 Call trace: 0x0 do_read_cache_folio+0x18c/0x29c mm/filemap.c:3825 read_cache_folio+0x14/0x20 mm/filemap.c:3857 freader_get_folio+0x1bc/0x214 lib/buildid.c:77 freader_fetch+0x44/0x164 lib/buildid.c:120 __build_id_parse.isra.0+0x98/0x2a8 lib/buildid.c:305 build_id_parse+0x18/0x24 lib/buildid.c:359 do_procmap_query+0x670/0x7a0 fs/proc/task_mmu.c:534 procfs_procmap_ioctl+0x2c/0x44 fs/proc/task_mmu.c:613 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0xac/0xf0 fs/ioctl.c:893 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 Code: ???????? ???????? ???????? ???????? (????????) ---[ end trace 0000000000000000 ]--- Tested on: commit: ae90f6a6 Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d3de40580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed4ea7a5e1330003 dashboard link: https://syzkaller.appspot.com/bug?extid=4089e577072948ac5531 compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Note: no patches were applied.