Hello, syzbot found the following issue on: HEAD commit: 987a926c1d8a Merge tag 'pull-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=111494b8880000 kernel config: https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5 dashboard link: https://syzkaller.appspot.com/bug?extid=3760ae4a4f4e0278a90f 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/3f613b00c57b/disk-987a926c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/92e205364bcf/vmlinux-987a926c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3760ae4a4f4e0278a90f@xxxxxxxxxxxxxxxxxxxxxxxxx loop2: detected capacity change from 0 to 4096 general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 12815 Comm: syz-executor.2 Not tainted 6.0.0-rc7-syzkaller-00132-g987a926c1d8a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:__nilfs_btree_get_block+0xc6/0x730 fs/nilfs2/btree.c:475 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 1d af 93 fe 4c 89 7c 24 20 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 fb ae 93 fe 4c 8d bc 24 80 00 00 RSP: 0018:ffffc9000e9c7140 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 0000000000040000 RDX: ffffc90013b88000 RSI: 000000000002c630 RDI: 000000000002c631 RBP: ffffc9000e9c7270 R08: ffffffff8346c1ec R09: 0000000000000000 R10: ffffed1009841a33 R11: 1ffff11009841a30 R12: 1ffff92001d38e34 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000025 FS: 00007f63dda66700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f63dda45718 CR3: 0000000020f0c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> nilfs_btree_do_lookup+0x558/0xc80 fs/nilfs2/btree.c:569 nilfs_btree_lookup+0x19d/0x1d0 fs/nilfs2/btree.c:686 nilfs_bmap_lookup_at_level+0xd8/0x350 fs/nilfs2/bmap.c:69 nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline] nilfs_mdt_submit_block+0x23d/0x520 fs/nilfs2/mdt.c:142 nilfs_mdt_read_block+0xa3/0x460 fs/nilfs2/mdt.c:176 nilfs_mdt_get_block+0x104/0x820 fs/nilfs2/mdt.c:251 nilfs_palloc_get_block+0x142/0x240 fs/nilfs2/alloc.c:216 nilfs_palloc_get_entry_block+0x1e8/0x2e0 fs/nilfs2/alloc.c:318 nilfs_ifile_get_inode_block+0xf0/0x1a0 fs/nilfs2/ifile.c:143 __nilfs_read_inode fs/nilfs2/inode.c:477 [inline] nilfs_iget+0x253/0x8b0 fs/nilfs2/inode.c:603 nilfs_get_root_dentry+0x28/0x230 fs/nilfs2/super.c:904 nilfs_fill_super+0x3dd/0x5d0 fs/nilfs2/super.c:1078 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 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: 0033:0x7f63dc88bada Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f63dda65f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f63dc88bada RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f63dda65fe0 RBP: 00007f63dda66020 R08: 00007f63dda66020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f63dda65fe0 R15: 00000000200162e0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__nilfs_btree_get_block+0xc6/0x730 fs/nilfs2/btree.c:475 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 1d af 93 fe 4c 89 7c 24 20 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 fb ae 93 fe 4c 8d bc 24 80 00 00 RSP: 0018:ffffc9000e9c7140 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 0000000000040000 RDX: ffffc90013b88000 RSI: 000000000002c630 RDI: 000000000002c631 RBP: ffffc9000e9c7270 R08: ffffffff8346c1ec R09: 0000000000000000 R10: ffffed1009841a33 R11: 1ffff11009841a30 R12: 1ffff92001d38e34 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000025 FS: 00007f63dda66700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c016f24f20 CR3: 0000000020f0c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: d8 48 c1 fmuls -0x3f(%rax) 6: e8 03 42 80 3c callq 0x3c80420e b: 30 00 xor %al,(%rax) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 1d af 93 fe callq 0xfe93af34 17: 4c 89 7c 24 20 mov %r15,0x20(%rsp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 30 add $0x30,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 fb ae 93 fe callq 0xfe93af34 39: 4c rex.WR 3a: 8d .byte 0x8d 3b: bc 24 80 00 00 mov $0x8024,%esp --- This report is generated by a bot. 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