general protection fault, probably for non-canonical address 0xdffffc000000002a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000150-0x0000000000000157] CPU: 0 PID: 4433 Comm: syz.0.47 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__lock_acquire+0xf8/0x7b50 kernel/locking/lockdep.c:4882 Code: 42 0f b6 04 00 84 c0 0f 85 2d 64 00 00 83 3d 02 55 2e 0c 00 0f 84 ee 26 00 00 83 3d d1 f0 c1 0a 00 74 2a 4c 89 e8 48 c1 e8 03 <42> 80 3c 00 00 74 12 4c 89 ef e8 89 4c 61 00 49 b8 00 00 00 00 00 RSP: 0018:ffffc9000306f460 EFLAGS: 00010002 RAX: 000000000000002a RBX: 0000000000000000 RCX: 1ffff9200060deac RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000150 RBP: ffffc9000306f690 R08: dffffc0000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1b16246 R12: 0000000000000001 R13: 0000000000000150 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fd33207a6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faff57a2d58 CR3: 000000001f3cf000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:793 [inline] start_creating+0x129/0x310 fs/debugfs/inode.c:350 __debugfs_create_file+0x6f/0x500 fs/debugfs/inode.c:399 debugfs_create_files block/blk-mq-debugfs.c:821 [inline] blk_mq_debugfs_register_hctx+0x3ae/0x7b0 block/blk-mq-debugfs.c:888 blk_mq_debugfs_register+0x4a5/0x7e0 block/blk-mq-debugfs.c:843 blk_register_queue+0x204/0x3a0 block/blk-sysfs.c:878 device_add_disk+0x589/0xd00 block/genhd.c:490 null_add_dev+0xe81/0x1630 drivers/block/null_blk/main.c:1913 nullb_device_power_store+0x241/0x370 drivers/block/null_blk/main.c:390 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd333e43159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd33207a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd3340cb090 RCX: 00007fd333e43159 RDX: 0000000000000001 RSI: 0000200000000200 RDI: 000000000000000b RBP: 00007fd333eda03b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd3340cb128 R14: 00007fd3340cb090 R15: 00007ffe6c57f2f8 Modules linked in: ---[ end trace e9b0134450cfb667 ]--- RIP: 0010:__lock_acquire+0xf8/0x7b50 kernel/locking/lockdep.c:4882 Code: 42 0f b6 04 00 84 c0 0f 85 2d 64 00 00 83 3d 02 55 2e 0c 00 0f 84 ee 26 00 00 83 3d d1 f0 c1 0a 00 74 2a 4c 89 e8 48 c1 e8 03 <42> 80 3c 00 00 74 12 4c 89 ef e8 89 4c 61 00 49 b8 00 00 00 00 00 RSP: 0018:ffffc9000306f460 EFLAGS: 00010002 RAX: 000000000000002a RBX: 0000000000000000 RCX: 1ffff9200060deac RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000150 RBP: ffffc9000306f690 R08: dffffc0000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1b16246 R12: 0000000000000001 R13: 0000000000000150 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fd33207a6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faff57a2d58 CR3: 000000001f3cf000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 42 0f b6 04 00 movzbl (%rax,%r8,1),%eax 5: 84 c0 test %al,%al 7: 0f 85 2d 64 00 00 jne 0x643a d: 83 3d 02 55 2e 0c 00 cmpl $0x0,0xc2e5502(%rip) # 0xc2e5516 14: 0f 84 ee 26 00 00 je 0x2708 1a: 83 3d d1 f0 c1 0a 00 cmpl $0x0,0xac1f0d1(%rip) # 0xac1f0f2 21: 74 2a je 0x4d 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 00 00 cmpb $0x0,(%rax,%r8,1) <-- trapping instruction 2f: 74 12 je 0x43 31: 4c 89 ef mov %r13,%rdi 34: e8 89 4c 61 00 call 0x614cc2 39: 49 rex.WB 3a: b8 00 00 00 00 mov $0x0,%eax