------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: syz.4.456/7367
WARNING: ./include/linux/ns_common.h:255 at put_user_ns include/linux/user_namespace.h:189 [inline], CPU#0: syz.4.456/7367
WARNING: ./include/linux/ns_common.h:255 at put_cred_rcu+0x2c5/0x340 kernel/cred.c:61, CPU#0: syz.4.456/7367
Modules linked in:
CPU: 0 UID: 0 PID: 7367 Comm: syz.4.456 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__ns_ref_put include/linux/ns_common.h:255 [inline]
RIP: 0010:put_user_ns include/linux/user_namespace.h:189 [inline]
RIP: 0010:put_cred_rcu+0x2c5/0x340 kernel/cred.c:61
Code: 5c 41 5d 41 5e 41 5f 5d e9 48 e1 8d 00 e8 03 8c 32 00 4c 89 e7 be 03 00 00 00 e8 d6 27 00 03 e9 b8 fe ff ff e8 ec 8b 32 00 90 <0f> 0b 90 eb 9f e8 e1 8b 32 00 4c 89 ff be 03 00 00 00 e8 b4 27 00
RSP: 0018:ffffc90000007ba8 EFLAGS: 00010246
RAX: ffffffff818e8124 RBX: ffff888032c10aa0 RCX: ffff88802c43db80
RDX: 0000000000000100 RSI: 0000000000000004 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff88805797c193 R09: 1ffff1100af2f832
R10: dffffc0000000000 R11: ffffed100af2f833 R12: dffffc0000000000
R13: ffff888032c10a00 R14: ffff88805797c000 R15: ffff88805797c190
FS: 00007f70a16a86c0(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f33e2888f98 CR3: 0000000075590000 CR4: 00000000003526f0
Call Trace:
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
handle_softirqs+0x286/0x870 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727
irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1055 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1055
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 4b 39 d7 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003eff558 EFLAGS: 00000206
RAX: 3fb441f179f1cb00 RBX: 0000000000000206 RCX: 3fb441f179f1cb00
RDX: 0000000000000003 RSI: ffffffff8d96f159 RDI: ffffffff8bbf40e0
RBP: ffff88802c43e728 R08: ffff888032a41903 R09: 1ffff11006548320
R10: dffffc0000000000 R11: ffffed1006548321 R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8df3d860 R15: ffff88802c43db80
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
pte_unmap include/linux/pgtable.h:136 [inline]
filemap_map_pages+0x18cf/0x1e20 mm/filemap.c:3930
do_fault_around mm/memory.c:5721 [inline]
do_read_fault mm/memory.c:5754 [inline]
do_fault mm/memory.c:5897 [inline]
do_pte_missing+0x20db/0x3340 mm/memory.c:4409
handle_pte_fault mm/memory.c:6242 [inline]
__handle_mm_fault mm/memory.c:6389 [inline]
handle_mm_fault+0x1999/0x32a0 mm/memory.c:6558
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x1650/0x29f0 mm/gup.c:1428
populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1860
__mm_populate+0x24c/0x380 mm/gup.c:1963
mm_populate include/linux/mm.h:3524 [inline]
vm_mmap_pgoff+0x387/0x4d0 mm/util.c:586
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f70a078f6c9
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:00007f70a16a8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f70a09e5fa0 RCX: 00007f70a078f6c9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f70a0811f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70a09e6038 R14: 00007f70a09e5fa0 R15: 00007ffd311dd4e8
----------------
Code disassembly (best guess):
0: 51 push %rcx
1: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
8: 00 00
a: 9c pushf
b: 8f 44 24 20 pop 0x20(%rsp)
f: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp)
16: 00
17: 75 56 jne 0x6f
19: f7 c3 00 02 00 00 test $0x200,%ebx
1f: 74 01 je 0x22
21: fb sti
22: 65 48 8b 05 4b 39 d7 mov %gs:0x10d7394b(%rip),%rax # 0x10d73975
29: 10
* 2a: 48 3b 44 24 28 cmp 0x28(%rsp),%rax <-- trapping instruction
2f: 0f 85 8b 00 00 00 jne 0xc0
35: 48 83 c4 30 add $0x30,%rsp
39: 5b pop %rbx
3a: 41 5c pop %r12
3c: 41 5d pop %r13
3e: 41 5e pop %r14