RBP: 00007f84af1e6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f84ae5b5fa0 R15: 00007ffdea0b2408 BUG: unable to handle page fault for address: fffffffffffffffc #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 72ae067 P4D 72ae067 PUD 72b0067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 4042 Comm: syz.1.1263 Not tainted 6.12.23-syzkaller-g6c1c18fcb8b7 #0 ba78288b1e32eb9f88d3f8d8da6b79a037cd8362 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:can_vma_merge_left+0x6c/0x4c0 mm/vma.c:296 Code: ff 0f 84 2b 01 00 00 4d 8d 67 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d4 28 08 00 <4d> 8b 24 24 4c 89 6d d0 49 83 c5 30 4c 89 e8 48 c1 e8 03 48 b9 00 RSP: 0018:ffffc9000f5478f8 EFLAGS: 00010246 RAX: 1fffffffffffffff RBX: ffffc9000f547a38 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000f547a20 RBP: ffffc9000f547938 R08: ffff88810bf2d49f R09: 1ffff110217e5a93 R10: dffffc0000000000 R11: ffffed10217e5a94 R12: fffffffffffffffc R13: ffffc9000f547a20 R14: 1ffff92001ea8f47 R15: fffffffffffffff4 FS: 00007f84af1e66c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffc CR3: 000000013b0ec000 CR4: 00000000003526b0 DR0: 00000000000004d8 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: vma_merge_existing_range mm/vma.c:703 [inline] vma_modify+0x250/0x1430 mm/vma.c:1427 vma_modify_flags_uffd+0x15a/0x190 mm/vma.c:1508 userfaultfd_clear_vma+0x1e8/0x260 mm/userfaultfd.c:1894 userfaultfd_release_all+0x280/0x490 mm/userfaultfd.c:2012 userfaultfd_release+0xe2/0x1a0 fs/userfaultfd.c:866 __fput+0x1fb/0xa00 fs/file_table.c:431 __fput_sync+0x4a/0x70 fs/file_table.c:516 __do_sys_close fs/open.c:1590 [inline] __se_sys_close+0x17b/0x240 fs/open.c:1575 __x64_sys_close+0x3c/0x60 fs/open.c:1575 x64_sys_call+0x2560/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:4 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f84ae38e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f84af1e6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007f84ae5b5fa0 RCX: 00007f84ae38e929 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f84af1e6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f84ae5b5fa0 R15: 00007ffdea0b2408 Modules linked in: CR2: fffffffffffffffc ---[ end trace 0000000000000000 ]--- RIP: 0010:can_vma_merge_left+0x6c/0x4c0 mm/vma.c:296 Code: ff 0f 84 2b 01 00 00 4d 8d 67 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d4 28 08 00 <4d> 8b 24 24 4c 89 6d d0 49 83 c5 30 4c 89 e8 48 c1 e8 03 48 b9 00 RSP: 0018:ffffc9000f5478f8 EFLAGS: 00010246 RAX: 1fffffffffffffff RBX: ffffc9000f547a38 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000f547a20 RBP: ffffc9000f547938 R08: ffff88810bf2d49f R09: 1ffff110217e5a93 R10: dffffc0000000000 R11: ffffed10217e5a94 R12: fffffffffffffffc R13: ffffc9000f547a20 R14: 1ffff92001ea8f47 R15: fffffffffffffff4 FS: 00007f84af1e66c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffc CR3: 000000013b0ec000 CR4: 00000000003526b0 DR0: 00000000000004d8 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: ff 0f decl (%rdi) 2: 84 2b test %ch,(%rbx) 4: 01 00 add %eax,(%rax) 6: 00 4d 8d add %cl,-0x73(%rbp) 9: 67 08 4c 89 e0 or %cl,-0x20(%ecx,%ecx,4) e: 48 c1 e8 03 shr $0x3,%rax 12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 19: fc ff df 1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 20: 74 08 je 0x2a 22: 4c 89 e7 mov %r12,%rdi 25: e8 d4 28 08 00 call 0x828fe * 2a: 4d 8b 24 24 mov (%r12),%r12 <-- trapping instruction 2e: 4c 89 6d d0 mov %r13,-0x30(%rbp) 32: 49 83 c5 30 add $0x30,%r13 36: 4c 89 e8 mov %r13,%rax 39: 48 c1 e8 03 shr $0x3,%rax 3d: 48 rex.W 3e: b9 .byte 0xb9