Hello, syzbot found the following issue on: HEAD commit: 41c03ba9beea Merge tag 'for_linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16aa7006480000 kernel config: https://syzkaller.appspot.com/x/.config?x=9babfdc3dd4772d0 dashboard link: https://syzkaller.appspot.com/bug?extid=ebfdcf89bfa9a9a37e0c compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/041403c21ee3/disk-41c03ba9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/579dec11b65a/vmlinux-41c03ba9.xz kernel image: https://storage.googleapis.com/syzbot-assets/dcb6cfc03c78/bzImage-41c03ba9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ebfdcf89bfa9a9a37e0c@xxxxxxxxxxxxxxxxxxxxxxxxx REISERFS (device loop5): Created .reiserfs_priv - reserved for xattr storage. overlayfs: upper fs needs to support d_type. overlayfs: upper fs does not support tmpfile. overlayfs: upper fs does not support RENAME_WHITEOUT. general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 14704 Comm: syz-executor.5 Not tainted 6.2.0-rc2-syzkaller-00057-g41c03ba9beea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:reiserfs_get_block+0x1afe/0x5180 fs/reiserfs/inode.c:1052 Code: 00 00 00 fc ff df 48 8b 44 24 58 42 0f b6 04 38 84 c0 0f 85 74 11 00 00 8b 94 24 20 04 00 00 4b 8d 1c ae 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 7d 11 00 00 4c 89 74 24 28 48 89 54 24 RSP: 0018:ffffc9000a966c20 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000c RCX: ffffc9000a967003 RDX: 0000000000000217 RSI: 00000000000003f4 RDI: 0000000000000000 RBP: ffffc9000a967270 R08: ffffffff822832cb R09: ffffed100565982c R10: ffffed100565982c R11: 1ffff1100565982b R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000010 R15: dffffc0000000000 FS: 00007f1f6b9fe700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c017dafef7 CR3: 000000002bab4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991 __reiserfs_write_begin+0x21a/0x460 fs/reiserfs/inode.c:2835 reiserfs_xattr_set_handle+0x394/0xec0 fs/reiserfs/xattr.c:571 reiserfs_xattr_set+0x417/0x530 fs/reiserfs/xattr.c:633 __vfs_setxattr+0x485/0x4c0 fs/xattr.c:202 __vfs_setxattr_noperm+0x128/0x5d0 fs/xattr.c:236 vfs_setxattr+0x228/0x450 fs/xattr.c:323 ovl_do_setxattr fs/overlayfs/overlayfs.h:254 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:266 [inline] ovl_verify_set_fh+0x1c7/0x430 fs/overlayfs/namei.c:473 ovl_verify_upper fs/overlayfs/overlayfs.h:565 [inline] ovl_get_indexdir+0x519/0x680 fs/overlayfs/super.c:1503 ovl_fill_super+0x195b/0x2790 fs/overlayfs/super.c:2025 mount_nodev+0x52/0xe0 fs/super.c:1405 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f1f6ce8c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1f6b9fe168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f1f6cfabf80 RCX: 00007f1f6ce8c0c9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f1f6cee7ae9 R08: 0000000020000280 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd914fe18f R14: 00007f1f6b9fe300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reiserfs_get_block+0x1afe/0x5180 fs/reiserfs/inode.c:1052 Code: 00 00 00 fc ff df 48 8b 44 24 58 42 0f b6 04 38 84 c0 0f 85 74 11 00 00 8b 94 24 20 04 00 00 4b 8d 1c ae 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 7d 11 00 00 4c 89 74 24 28 48 89 54 24 RSP: 0018:ffffc9000a966c20 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000c RCX: ffffc9000a967003 RDX: 0000000000000217 RSI: 00000000000003f4 RDI: 0000000000000000 RBP: ffffc9000a967270 R08: ffffffff822832cb R09: ffffed100565982c R10: ffffed100565982c R11: 1ffff1100565982b R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000010 R15: dffffc0000000000 FS: 00007f1f6b9fe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00fba6000 CR3: 000000002bab4000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 5 bytes skipped: 0: df 48 8b fisttps -0x75(%rax) 3: 44 24 58 rex.R and $0x58,%al 6: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax b: 84 c0 test %al,%al d: 0f 85 74 11 00 00 jne 0x1187 13: 8b 94 24 20 04 00 00 mov 0x420(%rsp),%edx 1a: 4b 8d 1c ae lea (%r14,%r13,4),%rbx 1e: 48 89 d8 mov %rbx,%rax 21: 48 c1 e8 03 shr $0x3,%rax * 25: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2a: 84 c0 test %al,%al 2c: 0f 85 7d 11 00 00 jne 0x11af 32: 4c 89 74 24 28 mov %r14,0x28(%rsp) 37: 48 rex.W 38: 89 .byte 0x89 39: 54 push %rsp 3a: 24 .byte 0x24 --- This report is generated by a bot. 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