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AJvYcCU/AXeln+r6RLfQpPBxyrxtoYRKFZhieDGgEJ3b8LxBvkos95zVLM4wRI5xa5n0KSM6nPEQpCP9NwgWglpy52S926m9e2TOTbir5Csy X-Gm-Message-State: AOJu0Yx8644vL+Tf+7ct8Gjg4qlmpjyCu9org5H4wju7zug5NGp8Qf5b sIdsX4+ex3PvISRLqzAVqSGd3lPsgEVvli+LCMGu9kQJgYCAyV2+Jr90Rf7ON1KXNa46s69jza5 Kk9RjG2m4qZ1PAkzhY4KBf7lLSXz47Guq67w3SL0sSXTAWxDJjhMohdU= X-Google-Smtp-Source: AGHT+IHMxlg4LR0Y29EJqqi3eoweYexP6RgQEfebTgHVsVzOhdGsRLogeDIf/2LIdRIUaNyfpSp79eneZEQi7HCh5IBZ5muqC19g Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:2c03:b0:7da:19cb:1c7f with SMTP id w3-20020a0566022c0300b007da19cb1c7fmr108039iov.0.1714737503279; Fri, 03 May 2024 04:58:23 -0700 (PDT) Date: Fri, 03 May 2024 04:58:23 -0700 In-Reply-To: <0000000000009d99ed06178b29b5@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c4312c06178b6f62@google.com> Subject: Re: [syzbot] [bcachefs?] BUG: unable to handle kernel paging request in bch2_fs_btree_key_cache_exit From: syzbot To: bfoster@redhat.com, kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 6a71d2909427 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=157bb450980000 kernel config: https://syzkaller.appspot.com/x/.config?x=fca646cf17cc616b dashboard link: https://syzkaller.appspot.com/bug?extid=a35cdb62ec34d44fb062 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124d68a7180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c77d21fa1405/disk-6a71d290.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/429fcd369816/vmlinux-6a71d290.xz kernel image: https://storage.googleapis.com/syzbot-assets/d3d8a4b85112/Image-6a71d290.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5eb4d59a9b9e/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a35cdb62ec34d44fb062@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 workqueue: Failed to create a rescuer kthread for wq "bcachefs": -EINTR bcachefs (1e246536-b1b3-4f86-83c2-3dfcc2979a4c): shutdown complete Unable to handle kernel paging request at virtual address ffff7000249ff210 KASAN: probably wild-memory-access in range [0xffff800124ff9080-0xffff800124ff9087] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ad5bd000 [ffff7000249ff210] pgd=0000000000000000, p4d=000000023e882003, pud=000000023e880003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 6351 Comm: syz-executor.0 Not tainted 6.9.0-rc4-syzkaller-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 80401005 (Nzcv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--) pc : bch2_fs_btree_key_cache_exit+0x7ec/0xfcc fs/bcachefs/btree_key_cache.c:974 lr : bch2_fs_btree_key_cache_exit+0x78c/0xfcc fs/bcachefs/btree_key_cache.c:970 sp : ffff8000a19f6e80 x29: ffff8000a19f6f50 x28: 1fffe0001df60010 x27: ffff0000efb044b0 x26: 1ffff0001433ede0 x25: dfff800000000000 x24: 1ffff0001168e5d4 x23: 0000000000000000 x22: ffff800124ff9080 x21: ffff8000a19f6f00 x20: ffff80008ee81218 x19: dfff800000000000 x18: ffff8000a19f6960 x17: 0000000000017999 x16: ffff8000802896e4 x15: 0000000000000001 x14: 1fffe0001df60898 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001df60899 x10: 0000000000ff0100 x9 : 0000000000000003 x8 : 1ffff000249ff210 x7 : ffff80008275d4e8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008275d4f8 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000008 Call trace: bch2_fs_btree_key_cache_exit+0x7ec/0xfcc fs/bcachefs/btree_key_cache.c:974 __bch2_fs_free fs/bcachefs/super.c:562 [inline] bch2_fs_release+0x1e0/0x564 fs/bcachefs/super.c:609 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:737 bch2_fs_free+0x288/0x2f0 fs/bcachefs/super.c:674 bch2_fs_alloc+0xe4c/0x1c60 fs/bcachefs/super.c:965 bch2_fs_open+0x740/0xb64 fs/bcachefs/super.c:2080 bch2_mount+0x558/0xe10 fs/bcachefs/fs.c:1900 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x288 fs/super.c:1779 do_new_mount+0x278/0x900 fs/namespace.c:3352 path_mount+0x590/0xe04 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3875 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Code: f90027e8 d343fec8 11000d29 f9002be8 (38f36908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f90027e8 str x8, [sp, #72] 4: d343fec8 lsr x8, x22, #3 8: 11000d29 add w9, w9, #0x3 c: f9002be8 str x8, [sp, #80] * 10: 38f36908 ldrsb w8, [x8, x19] <-- trapping instruction --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.