Dear Linux Developer, Recently when using our tool to fuzz kernel, the following crash was triggered: HEAD commit: 64570fbc14f8 Linux 5.15-rc5 git tree: upstream compiler: gcc 8.0.1 console output: https://drive.google.com/file/d/1Cq7j7bFaFe65Xo9xiOwMHvi0CpnFxEBU/view?usp=share_link kernel config: https://drive.google.com/file/d/1uDOeEYgJDcLiSOrx9W8v2bqZ6uOA_55t/view?usp=share_link Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: Wei Chen <harperchen1110@xxxxxxxxx> REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 0, max trans age 30 REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using rupasov hash to sort names ================================================================== BUG: KFENCE: invalid write in __memmove+0x24/0x1a0 Invalid write at 0xffff88813da00000: __memmove+0x24/0x1a0 leaf_paste_entries+0x1b8/0x2c0 balance_leaf+0x46b3/0x4cd0 do_balance+0xc6/0x350 reiserfs_paste_into_item+0x2d6/0x320 reiserfs_add_entry+0x3dd/0x570 reiserfs_mkdir+0x2b6/0x3c0 reiserfs_xattr_init+0x1be/0x330 reiserfs_fill_super+0x110e/0x1620 mount_bdev+0x23d/0x280 legacy_get_tree+0x2e/0x90 vfs_get_tree+0x29/0x100 path_mount+0x58e/0x10a0 do_mount+0x9b/0xb0 __x64_sys_mount+0x13a/0x150 do_syscall_64+0x34/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae CPU: 0 PID: 5293 Comm: syz-executor.0 Not tainted 5.15.0-rc5 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014 RIP: 0010:__memmove+0x24/0x1a0 Code: ff cc cc cc cc cc 48 89 f8 48 39 fe 7d 0f 49 89 f0 49 01 d0 49 39 f8 0f 8f a9 00 00 00 48 83 fa 20 0f 82 f5 00 00 00 48 89 d1 <f3> a4 c3 48 81 fa a8 02 00 00 72 05 40 38 fe 74 3b 48 83 ea 20 48 RSP: 0018:ffffc90002493578 EFLAGS: 00010286 RAX: ffff888129298fb4 RBX: 0000000000000002 RCX: ffffffffeb898f94 RDX: ffffffffffffffe0 RSI: ffff88813d9ffff0 RDI: ffff88813da00000 RBP: ffff888129298fa4 R08: ffff888129298f84 R09: 0000000100000001 R10: 0004004800000002 R11: 0000000100000001 R12: 0000000000000000 R13: ffff888129298f84 R14: 0000000000000010 R15: 0000000000000001 FS: 00007f2f77e09700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88813da00000 CR3: 000000010b047000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: leaf_paste_entries+0x1b8/0x2c0 balance_leaf+0x46b3/0x4cd0 do_balance+0xc6/0x350 reiserfs_paste_into_item+0x2d6/0x320 reiserfs_add_entry+0x3dd/0x570 reiserfs_mkdir+0x2b6/0x3c0 reiserfs_xattr_init+0x1be/0x330 reiserfs_fill_super+0x110e/0x1620 mount_bdev+0x23d/0x280 legacy_get_tree+0x2e/0x90 vfs_get_tree+0x29/0x100 path_mount+0x58e/0x10a0 do_mount+0x9b/0xb0 __x64_sys_mount+0x13a/0x150 do_syscall_64+0x34/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46abda Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2f77e08a48 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2f77e08af0 RCX: 000000000046abda RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f2f77e08ab0 RBP: 0000000020000000 R08: 00007f2f77e08af0 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000100 R13: 00007f2f77e08ab0 R14: 0000000000000001 R15: 0000000020011500 ================================================================== ---------------- Code disassembly (best guess): 0: ff cc dec %esp 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: 48 89 f8 mov %rdi,%rax 9: 48 39 fe cmp %rdi,%rsi c: 7d 0f jge 0x1d e: 49 89 f0 mov %rsi,%r8 11: 49 01 d0 add %rdx,%r8 14: 49 39 f8 cmp %rdi,%r8 17: 0f 8f a9 00 00 00 jg 0xc6 1d: 48 83 fa 20 cmp $0x20,%rdx 21: 0f 82 f5 00 00 00 jb 0x11c 27: 48 89 d1 mov %rdx,%rcx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 retq 2d: 48 81 fa a8 02 00 00 cmp $0x2a8,%rdx 34: 72 05 jb 0x3b 36: 40 38 fe cmp %dil,%sil 39: 74 3b je 0x76 3b: 48 83 ea 20 sub $0x20,%rdx 3f: 48 rex.W Best, Wei
