IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 hfs: unable to locate alternate MDB hfs: continuing without an alternate MDB BUG: kernel NULL pointer dereference, address: 0000000000000040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 2099b8067 P4D 2099b8067 PUD 2099b9067 PMD 0 Oops: 0000 [#1] SMP CPU: 1 PID: 3669 Comm: syz-executor4 Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hfs_find_init+0x19/0x60 fs/hfs/bfind.c:21 Code: fe ff ff ff eb 8d cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 41 54 49 89 f4 53 48 89 fb 48 89 7e 10 48 c7 46 18 00 00 00 00 <8b> 47 40 be c0 0c 00 00 8d 7c 00 04 e8 a6 fe e0 ff 48 85 c0 74 23 RSP: 0018:ffffc900003839d8 EFLAGS: 00010246 RAX: ffff888209a89c00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffc900003839f8 RDI: 0000000000000000 RBP: ffffc900003839e8 R08: ffffffff848ffd10 R09: ffffffff848ffd40 R10: ffffc90000383a50 R11: 6d177db777aa3959 R12: ffffc900003839f8 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8882084f90a8 FS: 00007f660f533700(0000) GS:ffff888218500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000040 CR3: 00000002099b7000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hfs_ext_read_extent+0x53/0x1a0 fs/hfs/extent.c:200 hfs_get_block+0x162/0x220 fs/hfs/extent.c:366 block_read_full_page+0x10b/0x3c0 fs/buffer.c:2289 hfs_readpage+0x13/0x20 fs/hfs/inode.c:38 do_read_cache_page+0x591/0x6e0 mm/filemap.c:2784 read_cache_page+0xd/0x10 mm/filemap.c:2883 read_mapping_page include/linux/pagemap.h:437 [inline] hfs_btree_open+0x136/0x340 fs/hfs/btree.c:78 hfs_mdb_get+0x4ee/0x60c fs/hfs/mdb.c:199 hfs_fill_super+0x361/0x630 fs/hfs/super.c:407 mount_bdev+0x18c/0x1c0 fs/super.c:1417 hfs_mount+0x10/0x20 fs/hfs/super.c:457 legacy_get_tree+0x2f/0x50 fs/fs_context.c:592 vfs_get_tree+0x28/0xc0 fs/super.c:1547 do_new_mount fs/namespace.c:2875 [inline] do_mount+0x892/0xab0 fs/namespace.c:3200 __do_sys_mount fs/namespace.c:3410 [inline] __se_sys_mount fs/namespace.c:3387 [inline] __x64_sys_mount+0xc0/0xe0 fs/namespace.c:3387 do_syscall_64+0x6e/0xf0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x457a7a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 5d 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 3a 8f fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f660f532bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000457a7a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f660f532c00 RBP: 0000000000000003 R08: 00000000200001c0 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000666 R14: 00000000006fba30 R15: 0000000000000000 Modules linked in: CR2: 0000000000000040 ---[ end trace 9c0d1201dbacc396 ]--- hfs: unable to locate alternate MDB RIP: 0010:hfs_find_init+0x19/0x60 fs/hfs/bfind.c:21 Code: fe ff ff ff eb 8d cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 41 54 49 89 f4 53 48 89 fb 48 89 7e 10 48 c7 46 18 00 00 00 00 <8b> 47 40 be c0 0c 00 00 8d 7c 00 04 e8 a6 fe e0 ff 48 85 c0 74 23 hfs: continuing without an alternate MDB RSP: 0018:ffffc900003839d8 EFLAGS: 00010246 RAX: ffff888209a89c00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffc900003839f8 RDI: 0000000000000000 BUG: kernel NULL pointer dereference, address: 0000000000000040 RBP: ffffc900003839e8 R08: ffffffff848ffd10 R09: ffffffff848ffd40 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 20992c067 P4D 20992c067 PUD 20992d067 PMD 0 Oops: 0000 [#2] SMP CPU: 0 PID: 3677 Comm: syz-executor3 Tainted: G D 5.8.0-rc6-syzkaller #0 R10: ffffc90000383a50 R11: 6d177db777aa3959 R12: ffffc900003839f8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hfs_find_init+0x19/0x60 fs/hfs/bfind.c:21 Code: fe ff ff ff eb 8d cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 41 54 49 89 f4 53 48 89 fb 48 89 7e 10 48 c7 46 18 00 00 00 00 <8b> 47 40 be c0 0c 00 00 8d 7c 00 04 e8 a6 fe e0 ff 48 85 c0 74 23 RSP: 0018:ffffc900003079d8 EFLAGS: 00010246 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8882084f90a8 RAX: ffff888207a0f000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffc900003079f8 RDI: 0000000000000000 RBP: ffffc900003079e8 R08: 0000000000000001 R09: 0000000000000000 R10: ffffc90000307a50 R11: 0000000000000800 R12: ffffc900003079f8 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8882084da150 FS: 00007f6992a9f700(0000) GS:ffff888218400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 FS: 00007f660f533700(0000) GS:ffff888218500000(0000) knlGS:0000000000000000 CR2: 0000000000000040 CR3: 000000020992b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hfs_ext_read_extent+0x53/0x1a0 fs/hfs/extent.c:200 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 hfs_get_block+0x162/0x220 fs/hfs/extent.c:366 block_read_full_page+0x10b/0x3c0 fs/buffer.c:2289 CR2: 0000000000000040 CR3: 00000002099b7000 CR4: 00000000001406e0 hfs_readpage+0x13/0x20 fs/hfs/inode.c:38 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 do_read_cache_page+0x591/0x6e0 mm/filemap.c:2784 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 read_cache_page+0xd/0x10 mm/filemap.c:2883 read_mapping_page include/linux/pagemap.h:437 [inline] hfs_btree_open+0x136/0x340 fs/hfs/btree.c:78 hfs_mdb_get+0x4ee/0x60c fs/hfs/mdb.c:199