failed to isolate pfn 48ba2 page:ffffea000122e880 refcount:2 mapcount:0 mapping:ffff888110813018 index:0x763 pfn:0x48ba2 memcg:ffff88810d74e780 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: 2541 Comm: syz.0.523 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:dentry_name+0x40e/0x970 lib/vsprintf.c:954 Code: 0f 84 3d 01 00 00 48 ff c0 48 89 44 24 10 e8 59 ff f6 fe 49 ff c6 41 ff c7 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 c6 00 00 00 44 0f b6 23 31 ff 44 89 e6 e8 RSP: 0018:ffffc9000b85ef00 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffffffffffffffff RDI: 0000000000000000 RBP: ffffc9000b85eff0 R08: ffffc9000b85ef7f R09: ffffc9000b85ef60 R10: dffffc0000000000 R11: fffff5200170bdf0 R12: 1ffff9200170bde8 R13: 0000000000000000 R14: ffffc9000b85f2f7 R15: 0000000000000000 FS: 00007f763da696c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f763da26ff8 CR3: 0000000138f1f000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pointer+0x61c/0xc60 lib/vsprintf.c:2458 vsnprintf+0xbb0/0x1990 lib/vsprintf.c:2815 vprintk_store+0x37f/0x13e0 kernel/printk/printk.c:2182 vprintk_emit+0xeb/0x320 kernel/printk/printk.c:2278 vprintk_default+0x26/0x30 kernel/printk/printk.c:2309 vprintk+0x7a/0x80 kernel/printk/printk_safe.c:45 _printk+0xda/0x130 kernel/printk/printk.c:2319 __dump_page mm/debug.c:-1 [inline] dump_page+0xc8f/0xe60 mm/debug.c:181 do_migrate_range mm/memory_hotplug.c:1802 [inline] offline_pages+0x12d0/0x18b0 mm/memory_hotplug.c:2023 memory_block_offline drivers/base/memory.c:236 [inline] memory_block_action drivers/base/memory.c:266 [inline] memory_block_change_state+0x318/0x500 drivers/base/memory.c:288 memory_subsys_offline+0x6c/0x80 drivers/base/memory.c:323 device_offline+0x25a/0x3a0 drivers/base/core.c:3943 state_store+0x9c/0x180 drivers/base/memory.c:349 dev_attr_store+0x5e/0x80 drivers/base/core.c:2136 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:143 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2218 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0033:0x7f763f010199 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:00007f763da69028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f763f297fa0 RCX: 00007f763f010199 RDX: 0000000000000007 RSI: 0000200000000200 RDI: 0000000000000007 RBP: 00007f763f0a78e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f763f298038 R14: 00007f763f297fa0 R15: 00007ffdd5a12588 Modules linked in: ---[ end trace 0e60f87e872a76b2 ]--- RIP: 0010:dentry_name+0x40e/0x970 lib/vsprintf.c:954 Code: 0f 84 3d 01 00 00 48 ff c0 48 89 44 24 10 e8 59 ff f6 fe 49 ff c6 41 ff c7 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 c6 00 00 00 44 0f b6 23 31 ff 44 89 e6 e8 RSP: 0018:ffffc9000b85ef00 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffffffffffffffff RDI: 0000000000000000 RBP: ffffc9000b85eff0 R08: ffffc9000b85ef7f R09: ffffc9000b85ef60 R10: dffffc0000000000 R11: fffff5200170bdf0 R12: 1ffff9200170bde8 R13: 0000000000000000 R14: ffffc9000b85f2f7 R15: 0000000000000000 FS: 00007f763da696c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f763da26ff8 CR3: 0000000138f1f000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 0f 84 3d 01 00 00 je 0x143 6: 48 ff c0 inc %rax 9: 48 89 44 24 10 mov %rax,0x10(%rsp) e: e8 59 ff f6 fe call 0xfef6ff6c 13: 49 ff c6 inc %r14 16: 41 ff c7 inc %r15d 19: 48 89 d8 mov %rbx,%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: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 c6 00 00 00 jne 0xfc 36: 44 0f b6 23 movzbl (%rbx),%r12d 3a: 31 ff xor %edi,%edi 3c: 44 89 e6 mov %r12d,%esi 3f: e8 .byte 0xe8