This is odd - it seems to be req->base.flags that's uninitialized, and I can't find the code that's supposed to be initializing it - but bcachefs usage seems to be the same as all the other uses I'm looking at; if it is req->base.flags then other code must be buggy as well? On Fri, May 03, 2024 at 02:34:30PM +0200, Aleksandr Nogikh wrote: > #syz set subsystems: bcachefs > > On Fri, May 3, 2024 at 2:24 PM syzbot > <syzbot+97b4444a5bd7bf30b3a8@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: f03359bca01b Merge tag 'for-6.9-rc6-tag' of git://git.kern.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=17c169df180000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=bbf567496022057b > > dashboard link: https://syzkaller.appspot.com/bug?extid=97b4444a5bd7bf30b3a8 > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > userspace arch: i386 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/b345b1c01095/disk-f03359bc.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/d59970ea319e/vmlinux-f03359bc.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/47407f406f40/bzImage-f03359bc.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+97b4444a5bd7bf30b3a8@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > loop3: detected capacity change from 0 to 32768 > > bcachefs (loop3): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,nojournal_transaction_names > > bcachefs (loop3): recovering from clean shutdown, journal seq 10 > > ===================================================== > > BUG: KMSAN: uninit-value in skcipher_walk_virt+0x91/0x1a0 crypto/skcipher.c:504 > > skcipher_walk_virt+0x91/0x1a0 crypto/skcipher.c:504 > > chacha_stream_xor+0x7c/0x710 crypto/chacha_generic.c:22 > > crypto_chacha_crypt+0x79/0xb0 crypto/chacha_generic.c:45 > > crypto_skcipher_encrypt+0x1a0/0x1e0 crypto/skcipher.c:671 > > do_encrypt_sg fs/bcachefs/checksum.c:107 [inline] > > do_encrypt+0x99c/0xc30 fs/bcachefs/checksum.c:127 > > gen_poly_key fs/bcachefs/checksum.c:190 [inline] > > bch2_checksum+0x21f/0x7c0 fs/bcachefs/checksum.c:226 > > bch2_btree_node_read_done+0x1898/0x75e0 fs/bcachefs/btree_io.c:1055 > > btree_node_read_work+0x8a5/0x1eb0 fs/bcachefs/btree_io.c:1324 > > bch2_btree_node_read+0x3d42/0x4b50 > > __bch2_btree_root_read fs/bcachefs/btree_io.c:1748 [inline] > > bch2_btree_root_read+0xa6c/0x13d0 fs/bcachefs/btree_io.c:1772 > > read_btree_roots+0x454/0xee0 fs/bcachefs/recovery.c:457 > > bch2_fs_recovery+0x7adb/0x9310 fs/bcachefs/recovery.c:785 > > bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043 > > bch2_fs_open+0x135f/0x1670 fs/bcachefs/super.c:2102 > > bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1903 > > legacy_get_tree+0x114/0x290 fs/fs_context.c:662 > > vfs_get_tree+0xa7/0x570 fs/super.c:1779 > > do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 > > path_mount+0x742/0x1f20 fs/namespace.c:3679 > > do_mount fs/namespace.c:3692 [inline] > > __do_sys_mount fs/namespace.c:3898 [inline] > > __se_sys_mount+0x725/0x810 fs/namespace.c:3875 > > __ia32_sys_mount+0xe3/0x150 fs/namespace.c:3875 > > ia32_sys_call+0x3a9a/0x40a0 arch/x86/include/generated/asm/syscalls_32.h:22 > > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] > > __do_fast_syscall_32+0xb4/0x120 arch/x86/entry/common.c:386 > > do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411 > > do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449 > > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > > > > Local variable __req_desc.i created at: > > do_encrypt_sg fs/bcachefs/checksum.c:101 [inline] > > do_encrypt+0x8f9/0xc30 fs/bcachefs/checksum.c:127 > > gen_poly_key fs/bcachefs/checksum.c:190 [inline] > > bch2_checksum+0x21f/0x7c0 fs/bcachefs/checksum.c:226 > > > > CPU: 1 PID: 15218 Comm: syz-executor.3 Not tainted 6.9.0-rc6-syzkaller-00131-gf03359bca01b #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > > ===================================================== > > > > > > --- > > 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@xxxxxxxxxxxxxxxx. > > > > syzbot will keep track of this issue. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > > > If the report is already addressed, let syzbot know by replying with: > > #syz fix: exact-commit-title > > > > If you want to overwrite report's subsystems, reply with: > > #syz set subsystems: new-subsystem > > (See the list of subsystem names on the web dashboard) > > > > If the report is a duplicate of another one, reply with: > > #syz dup: exact-subject-of-another-report > > > > If you want to undo deduplication, reply with: > > #syz undup > > > > -- > > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000dcd2ae06178bccb0%40google.com.
