Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 UID: 0 PID: 5994 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:folio_test_anon include/linux/page-flags.h:718 [inline]
RIP: 0010:zap_huge_pmd+0x7b1/0x1030 mm/huge_memory.c:2463
Code: 08 00 00 e8 11 e0 92 ff 48 c7 44 24 10 00 00 00 00 4c 8b 3c 24 4c 8d 75 18 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 f1 43 fc ff 49 8b 1e 48 89 de 48 83
RSP: 0018:ffffc90003bb7550 EFLAGS: 00010206
RAX: 0000000000000003 RBX: f000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffff88807cc9802f R09: 1ffff1100f993005
R10: dffffc0000000000 R11: ffffed100f993006 R12: ffff88807cc98028
R13: fffffffffffffa00 R14: 0000000000000018 R15: ffffc90003bb7ac0
FS: 0000000000000000(0000) GS:ffff888124ee0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 000000000e94a000 CR4: 00000000003526f0
Call Trace:
<TASK>
zap_pmd_range mm/memory.c:1990 [inline]
zap_pud_range mm/memory.c:2032 [inline]
zap_p4d_range mm/memory.c:2053 [inline]
__zap_vma_range+0xa82/0x4bd0 mm/memory.c:2093
unmap_vmas+0x379/0x530 mm/memory.c:2162
exit_mmap+0x280/0xa10 mm/mmap.c:1302
__mmput+0x118/0x430 kernel/fork.c:1180
exit_mm+0x18e/0x250 kernel/exit.c:581
do_exit+0x8b9/0x2490 kernel/exit.c:962
do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
__do_sys_exit_group kernel/exit.c:1127 [inline]
__se_sys_exit_group kernel/exit.c:1125 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1125
x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd0b39c799
Code: Unable to access opcode bytes at 0x7fdd0b39c76f.
RSP: 002b:00007fff630f1d78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdd0b39c799
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000000 R09: 00007fdd0b5e63e0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd0b5e63e0 R14: 0000000000000003 R15: 00007fff630f1e30
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_test_anon include/linux/page-flags.h:718 [inline]
RIP: 0010:zap_huge_pmd+0x7b1/0x1030 mm/huge_memory.c:2463
Code: 08 00 00 e8 11 e0 92 ff 48 c7 44 24 10 00 00 00 00 4c 8b 3c 24 4c 8d 75 18 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 f1 43 fc ff 49 8b 1e 48 89 de 48 83
RSP: 0018:ffffc90003bb7550 EFLAGS: 00010206
RAX: 0000000000000003 RBX: f000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffff88807cc9802f R09: 1ffff1100f993005
R10: dffffc0000000000 R11: ffffed100f993006 R12: ffff88807cc98028
R13: fffffffffffffa00 R14: 0000000000000018 R15: ffffc90003bb7ac0
FS: 0000000000000000(0000) GS:ffff888124ee0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 000000000e94a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 08 00 or %al,(%rax)
2: 00 e8 add %ch,%al
4: 11 e0 adc %esp,%eax
6: 92 xchg %eax,%edx
7: ff 48 c7 decl -0x39(%rax)
a: 44 24 10 rex.R and $0x10,%al
d: 00 00 add %al,(%rax)
f: 00 00 add %al,(%rax)
11: 4c 8b 3c 24 mov (%rsp),%r15
15: 4c 8d 75 18 lea 0x18(%rbp),%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 f1 43 fc ff call 0xfffc4429
38: 49 8b 1e mov (%r14),%rbx
3b: 48 89 de mov %rbx,%rsi
3e: 48 rex.W
3f: 83 .byte 0x83