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jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com X-Headers-End: 1oitDt-001yGC-UU Subject: [f2fs-dev] [syzbot] BUG: unable to handle kernel NULL pointer dereference in f2fs_stop_discard_thread X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hello, syzbot found the following issue on: HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=13615406880000 kernel config: https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e dashboard link: https://syzkaller.appspot.com/bug?extid=035a381ea1afb63f098d compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15281162880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=137aa942880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/eb56ba4877e7/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+035a381ea1afb63f098d@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 264192 F2FS-fs (loop0): invalid crc_offset: 0 F2FS-fs (loop0): Found nat_bits in checkpoint F2FS-fs (loop0): Mounted with checkpoint version = 3651456e Unable to handle kernel NULL pointer dereference at virtual address 000000000000001c Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010899a000 [000000000000001c] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3029 Comm: syz-executor654 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __lse_atomic_fetch_add_relaxed arch/arm64/include/asm/atomic_lse.h:62 [inline] pc : arch_atomic_fetch_add_relaxed arch/arm64/include/asm/atomic.h:49 [inline] pc : atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:117 [inline] pc : __refcount_add include/linux/refcount.h:193 [inline] pc : __refcount_inc include/linux/refcount.h:250 [inline] pc : refcount_inc include/linux/refcount.h:267 [inline] pc : get_task_struct include/linux/sched/task.h:110 [inline] pc : kthread_stop+0x34/0x1c0 kernel/kthread.c:703 lr : __refcount_add include/linux/refcount.h:193 [inline] lr : __refcount_inc include/linux/refcount.h:250 [inline] lr : refcount_inc include/linux/refcount.h:267 [inline] lr : get_task_struct include/linux/sched/task.h:110 [inline] lr : kthread_stop+0x30/0x1c0 kernel/kthread.c:703 sp : ffff8000128abb60 x29: ffff8000128abb60 x28: 0000000000000000 x27: 000000000000007e x26: ffff80000d30cf28 x25: ffff80000d309000 x24: 0000000000000008 x23: ffffffffffffffff x22: 0000000000000000 x21: 0000000000000000 x20: fffffffffffffff4 x19: 000000000000001c x18: 00000000000000c0 x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c665cf80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c665cf80 x11: ff808000081403c0 x10: 0000000000000000 x9 : ffff8000081403c0 x8 : 0000000000000001 x7 : ffff8000095d331c x6 : 0000000000000000 x5 : 000000008010000f x4 : fffffc00032f6a20 x3 : 000000008010000f x2 : ffff0000cbda8100 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_task_struct include/linux/sched/task.h:110 [inline] kthread_stop+0x34/0x1c0 kernel/kthread.c:703 f2fs_stop_discard_thread+0x3c/0x5c fs/f2fs/segment.c:1638 kill_f2fs_super+0x5c/0x194 fs/f2fs/super.c:4522 deactivate_locked_super+0x70/0xe8 fs/super.c:332 deactivate_super+0xd0/0xd4 fs/super.c:363 cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0xc4/0x14c kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x26c/0xbe0 kernel/exit.c:795 do_group_exit+0x60/0xe8 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __wake_up_parent+0x0/0x40 kernel/exit.c:934 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 9100a293 d503201f 94057e16 52800028 (b8280275) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9100a293 add x19, x20, #0x28 4: d503201f nop 8: 94057e16 bl 0x15f860 c: 52800028 mov w8, #0x1 // #1 * 10: b8280275 ldadd w8, w21, [x19] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0135EC433FE for ; Thu, 13 Oct 2022 08:06:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229629AbiJMIGB (ORCPT ); Thu, 13 Oct 2022 04:06:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229678AbiJMIF4 (ORCPT ); Thu, 13 Oct 2022 04:05:56 -0400 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE6C7146392 for ; Thu, 13 Oct 2022 01:05:51 -0700 (PDT) Received: by mail-io1-f69.google.com with SMTP id z6-20020a6be206000000b006bbebf8f872so634573ioc.2 for ; Thu, 13 Oct 2022 01:05:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=I51KfTKbgk4rY8YSX6F/YmYNBXk8I8h6VSzhs8RfJc4=; b=aS/5SJATF7AKq5ypaTJprNmgBAUlWyHDlU3/psrpTmmbaFY86+yeHtHwg3r7MtVYbc VVJ9ZOpDp7kqiietdiQNWzmeDYHLmfm0ioqxvNmVUck2WNx5lho9fn1oSGXGbg9LXJC7 oYQfNMnNWGT4brvpiSO8S+2svv8F27WNYfJ6Vnd+KGKqW5YuNAUKl9ciMp6WW5nKH5no /EBt/ErXFHp5abMkeM+of+liznUnGG/z+KKw6kDJrIoUIO9dVc9hqKUqZyZ9Lukz+bsT vSBpF4pSDLWwDggtr5OTALcObi+6JoclHcKF7rqE++xJlxeMkDsvQ0milYzQCv9KKg+E Vbiw== X-Gm-Message-State: ACrzQf0L87DXWfSoOL3QTBbsAYn5LWB9N/nMvgnMO8PEdNdXP579N0xk h54bqdc1tmwPvRi+GPgk+XCkNNZUaAZVcBI5OWLWJAC48K75 X-Google-Smtp-Source: AMsMyM4vvevbmpgx/vNPnuT2rCItgWUCeOmv/TzQnNComfB1jafI5+1ktBpXRHXqCZBD7PV4djBa1yzqvOHy6XMCJdN4qdlnCj5y MIME-Version: 1.0 X-Received: by 2002:a05:6638:2103:b0:35a:75b6:9992 with SMTP id n3-20020a056638210300b0035a75b69992mr16913367jaj.244.1665648340435; Thu, 13 Oct 2022 01:05:40 -0700 (PDT) Date: Thu, 13 Oct 2022 01:05:40 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a7077705eae5f90c@google.com> Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in f2fs_stop_discard_thread From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=13615406880000 kernel config: https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e dashboard link: https://syzkaller.appspot.com/bug?extid=035a381ea1afb63f098d compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15281162880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=137aa942880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/eb56ba4877e7/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+035a381ea1afb63f098d@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 264192 F2FS-fs (loop0): invalid crc_offset: 0 F2FS-fs (loop0): Found nat_bits in checkpoint F2FS-fs (loop0): Mounted with checkpoint version = 3651456e Unable to handle kernel NULL pointer dereference at virtual address 000000000000001c Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010899a000 [000000000000001c] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3029 Comm: syz-executor654 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __lse_atomic_fetch_add_relaxed arch/arm64/include/asm/atomic_lse.h:62 [inline] pc : arch_atomic_fetch_add_relaxed arch/arm64/include/asm/atomic.h:49 [inline] pc : atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:117 [inline] pc : __refcount_add include/linux/refcount.h:193 [inline] pc : __refcount_inc include/linux/refcount.h:250 [inline] pc : refcount_inc include/linux/refcount.h:267 [inline] pc : get_task_struct include/linux/sched/task.h:110 [inline] pc : kthread_stop+0x34/0x1c0 kernel/kthread.c:703 lr : __refcount_add include/linux/refcount.h:193 [inline] lr : __refcount_inc include/linux/refcount.h:250 [inline] lr : refcount_inc include/linux/refcount.h:267 [inline] lr : get_task_struct include/linux/sched/task.h:110 [inline] lr : kthread_stop+0x30/0x1c0 kernel/kthread.c:703 sp : ffff8000128abb60 x29: ffff8000128abb60 x28: 0000000000000000 x27: 000000000000007e x26: ffff80000d30cf28 x25: ffff80000d309000 x24: 0000000000000008 x23: ffffffffffffffff x22: 0000000000000000 x21: 0000000000000000 x20: fffffffffffffff4 x19: 000000000000001c x18: 00000000000000c0 x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c665cf80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c665cf80 x11: ff808000081403c0 x10: 0000000000000000 x9 : ffff8000081403c0 x8 : 0000000000000001 x7 : ffff8000095d331c x6 : 0000000000000000 x5 : 000000008010000f x4 : fffffc00032f6a20 x3 : 000000008010000f x2 : ffff0000cbda8100 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_task_struct include/linux/sched/task.h:110 [inline] kthread_stop+0x34/0x1c0 kernel/kthread.c:703 f2fs_stop_discard_thread+0x3c/0x5c fs/f2fs/segment.c:1638 kill_f2fs_super+0x5c/0x194 fs/f2fs/super.c:4522 deactivate_locked_super+0x70/0xe8 fs/super.c:332 deactivate_super+0xd0/0xd4 fs/super.c:363 cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0xc4/0x14c kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x26c/0xbe0 kernel/exit.c:795 do_group_exit+0x60/0xe8 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __wake_up_parent+0x0/0x40 kernel/exit.c:934 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 9100a293 d503201f 94057e16 52800028 (b8280275) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9100a293 add x19, x20, #0x28 4: d503201f nop 8: 94057e16 bl 0x15f860 c: 52800028 mov w8, #0x1 // #1 * 10: b8280275 ldadd w8, w21, [x19] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches