Hello, syzbot found the following issue on: HEAD commit: 3800a713b607 Merge tag 'mm-hotfixes-stable-2022-09-26' of .. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12704b40880000 kernel config: https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5 dashboard link: https://syzkaller.appspot.com/bug?extid=2b32eb36c1a825b7a74c compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e930c0880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157ce604880000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2b32eb36c1a825b7a74c@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 264192 NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 0 PID: 3614 Comm: syz-executor231 Not tainted 6.0.0-rc7-syzkaller-00029-g3800a713b607 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 assign_lock_key+0x212/0x220 kernel/locking/lockdep.c:979 register_lock_class+0x18d/0x930 kernel/locking/lockdep.c:1292 __lock_acquire+0xe4/0x1f60 kernel/locking/lockdep.c:4932 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5666 down_read+0x39/0x50 kernel/locking/rwsem.c:1499 nilfs_bmap_lookup_at_level+0x88/0x350 fs/nilfs2/bmap.c:68 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: 0033:0x7efd97e9462a Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc213b3aa8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc213b3b00 RCX: 00007efd97e9462a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc213b3ac0 RBP: 00007ffc213b3ac0 R08: 00007ffc213b3b00 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020000788 R13: 0000000000000003 R14: 0000000000000004 R15: 000000000000003b </TASK> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 3614 Comm: syz-executor231 Not tainted 6.0.0-rc7-syzkaller-00029-g3800a713b607 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 RIP: 0010:nilfs_bmap_lookup_at_level+0xb9/0x350 fs/nilfs2/bmap.c:69 Code: 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 4b 9b 94 fe 4c 8b 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 29 9b 94 fe 4c 89 ff 4c 89 ee 44 89 RSP: 0018:ffffc9000385f440 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888074ff2760 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888074ff26c8 RBP: ffffc9000385f4f0 R08: dffffc0000000000 R09: ffffed100e9fe4da R10: ffffed100e9fe4da R11: 1ffff1100e9fe4d9 R12: 0000000000000001 R13: 0000000000000002 R14: 0000000000000000 R15: ffff888074ff2688 FS: 0000555555be2300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc213b4000 CR3: 00000000725e8000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> 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: 0033:0x7efd97e9462a Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc213b3aa8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc213b3b00 RCX: 00007efd97e9462a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc213b3ac0 RBP: 00007ffc213b3ac0 R08: 00007ffc213b3b00 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020000788 R13: 0000000000000003 R14: 0000000000000004 R15: 000000000000003b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nilfs_bmap_lookup_at_level+0xb9/0x350 fs/nilfs2/bmap.c:69 Code: 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 4b 9b 94 fe 4c 8b 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 29 9b 94 fe 4c 89 ff 4c 89 ee 44 89 RSP: 0018:ffffc9000385f440 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888074ff2760 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888074ff26c8 RBP: ffffc9000385f4f0 R08: dffffc0000000000 R09: ffffed100e9fe4da R10: ffffed100e9fe4da R11: 1ffff1100e9fe4d9 R12: 0000000000000001 R13: 0000000000000002 R14: 0000000000000000 R15: ffff888074ff2688 FS: 0000555555be2300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560cba9be408 CR3: 00000000725e8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 89 d8 mov %rbx,%rax 3: 48 c1 e8 03 shr $0x3,%rax 7: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) c: 74 08 je 0x16 e: 48 89 df mov %rbx,%rdi 11: e8 4b 9b 94 fe callq 0xfe949b61 16: 4c 8b 33 mov (%rbx),%r14 19: 4c 89 f0 mov %r14,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 29 9b 94 fe callq 0xfe949b61 38: 4c 89 ff mov %r15,%rdi 3b: 4c 89 ee mov %r13,%rsi 3e: 44 rex.R 3f: 89 .byte 0x89 --- 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