syzbot

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WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.1.669/8491
WARNING: ./include/linux/ns_common.h:255 at put_uts_ns include/linux/uts_namespace.h:37 [inline], CPU#1: syz.1.669/8491
WARNING: ./include/linux/ns_common.h:255 at free_nsproxy+0x415/0x560 kernel/nsproxy.c:193, CPU#1: syz.1.669/8491
Modules linked in:
CPU: 1 UID: 0 PID: 8491 Comm: syz.1.669 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__ns_ref_put include/linux/ns_common.h:255 [inline]
RIP: 0010:put_uts_ns include/linux/uts_namespace.h:37 [inline]
RIP: 0010:free_nsproxy+0x415/0x560 kernel/nsproxy.c:193
Code: 85 ed 0f 8e be 00 00 00 e8 b8 33 33 00 48 8b 3d 91 38 32 11 48 89 de 5b 41 5c 41 5e 41 5f 5d e9 81 34 8e 00 e8 9c 33 33 00 90 <0f> 0b 90 e9 ba fc ff ff e8 8e 33 33 00 4c 89 ff be 03 00 00 00 e8
RSP: 0018:ffffc9000383fa90 EFLAGS: 00010293
RAX: ffffffff818e2be4 RBX: ffff88801d2a32d8 RCX: ffff8880257ddb80
RDX: 0000000000000000 RSI: 00000000fffffffd RDI: 0000000000000000
RBP: 00000000fffffffd R08: ffff8880263c4253 R09: 1ffff11004c7884a
R10: dffffc0000000000 R11: ffffed1004c7884b R12: dffffc0000000000
R13: 0000000000000009 R14: ffff8880263c4000 R15: ffff8880263c4250
FS:  0000000000000000(0000) GS:ffff888125b82000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557ac4c5c8 CR3: 000000007f4a6000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_exit+0x6b8/0x2300 kernel/exit.c:969
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9f851c1f85
Code: Unable to access opcode bytes at 0x7f9f851c1f5b.
RSP: 002b:00007f9f85f7bf80 EFLAGS: 00000293
 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f9f853e6090 RCX: 00007f9f851c1f85
RDX: 00007f9f85f7bfc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9f85211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000