audit: type=1326 audit(1763100182.290:15): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4413 comm="syz-executor.7" exe="/syz-executor.7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5004a70b19 code=0x0 ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: lib/refcount.c:28 at refcount_warn_saturate+0x10d/0x210, CPU#0: syz-executor.3/4408 Modules linked in: CPU: 0 UID: 0 PID: 4408 Comm: syz-executor.3 Not tainted 6.18.0-rc5-next-20251113 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x10d/0x210 Code: 9b 0c 04 31 ff 89 de e8 31 8b 1f ff 84 db 75 9f e8 58 90 1f ff c6 05 5e 9b 0c 04 01 90 48 c7 c7 80 07 03 85 e8 54 bc e4 fe 90 <0f> 0b 90 90 e9 7c ff ff ff e8 35 90 1f ff 0f b6 1d 39 9b 0c 04 31 RSP: 0018:ffff88801a8bf9e0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90007c1f000 RDX: 0000000000040000 RSI: ffffffff813a403e RDI: 0000000000000001 RBP: ffffffff885b1e0c R08: 0000000000000001 R09: ffffed1003517ef3 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff885b1de0 R13: ffffffff885b1e0c R14: ffff88801e505040 R15: ffff8880166cbff8 FS: 00007f03d9061700(0000) GS:ffff8880e5394000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564ff27749a0 CR3: 000000001f6e0000 CR4: 0000000000350ef0 Call Trace: nsproxy_free+0x4d3/0x5a0 create_new_namespaces+0x585/0x750 copy_namespaces+0x45c/0x580 copy_process+0x26e4/0x72a0 kernel_clone+0xea/0x7f0 __do_sys_clone3+0x1f5/0x280 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f03dbb2db19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f03d9061188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f03dbc410e0 RCX: 00007f03dbb2db19 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020005880 RBP: 00007f03dbb87f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe8ce7c71f R14: 00007f03d9061300 R15: 0000000000022000 irq event stamp: 6899 hardirqs last enabled at (6913): [] __up_console_sem+0x78/0x80 hardirqs last disabled at (6924): [] __up_console_sem+0x5d/0x80 softirqs last enabled at (6502): [] handle_softirqs+0x50c/0x770 softirqs last disabled at (6487): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- Oops: general protection fault, probably for non-canonical address 0xe029fc40e0000026: 0000 [#1] SMP KASAN NOPTI KASAN: maybe wild-memory-access in range [0x0150020700000130-0x0150020700000137] CPU: 0 UID: 0 PID: 4408 Comm: syz-executor.3 Tainted: G W 6.18.0-rc5-next-20251113 #1 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:nsproxy_free+0x1ab/0x5a0 Code: 0f 85 b4 03 00 00 4c 8b 65 38 4d 85 e4 74 41 e8 2b 48 30 00 49 8d 7c 24 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b8 03 00 00 49 8b 5c 24 30 bf 08 00 00 00 48 89 RSP: 0018:ffff88801a8bf9f8 EFLAGS: 00010213 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007c1f000 RDX: 002a0040e0000026 RSI: ffffffff8144ca85 RDI: 0150020700000134 RBP: ffff88800dbc95b0 R08: 0000000000000001 R09: ffffed1003517ef3 R10: 0000000000000001 R11: 0000000000000001 R12: 0150020700000104 R13: ffffffff885b1e0c R14: ffff88801e505040 R15: ffff8880166cbff8 FS: 00007f03d9061700(0000) GS:ffff8880e5394000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564ff27749a0 CR3: 000000001f6e0000 CR4: 0000000000350ef0 Call Trace: create_new_namespaces+0x585/0x750 copy_namespaces+0x45c/0x580 copy_process+0x26e4/0x72a0 kernel_clone+0xea/0x7f0 __do_sys_clone3+0x1f5/0x280 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f03dbb2db19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f03d9061188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f03dbc410e0 RCX: 00007f03dbb2db19 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020005880 RBP: 00007f03dbb87f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe8ce7c71f R14: 00007f03d9061300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nsproxy_free+0x1ab/0x5a0 Code: 0f 85 b4 03 00 00 4c 8b 65 38 4d 85 e4 74 41 e8 2b 48 30 00 49 8d 7c 24 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b8 03 00 00 49 8b 5c 24 30 bf 08 00 00 00 48 89 RSP: 0018:ffff88801a8bf9f8 EFLAGS: 00010213 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007c1f000 RDX: 002a0040e0000026 RSI: ffffffff8144ca85 RDI: 0150020700000134 RBP: ffff88800dbc95b0 R08: 0000000000000001 R09: ffffed1003517ef3 R10: 0000000000000001 R11: 0000000000000001 R12: 0150020700000104 R13: ffffffff885b1e0c R14: ffff88801e505040 R15: ffff8880166cbff8 FS: 00007f03d9061700(0000) GS:ffff8880e5394000(0000) knlGS:0000000000000000 loop2: detected capacity change from 0 to 136 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564ff27749a0 CR3: 000000001f6e0000 CR4: 0000000000350ef0 iso9660: Unknown parameter 'Bð™šNÌå—³Î™XðÅ¦ñás¨P%Ã×˜x«½¾Z$E@ž¥wpÞ0ÛÓŸWÙjµ¼Ü0t¶—ÃCºa†ú–ÔYˆÝu`@£4¾±3D€f6CgÜinˆK!‡Ú®¿³î?(Rúœ˜/é`Aáaö»>3îtMZéâÔ½¥ú<¼Õ}¿*XßP#£‰úñ}â?hˆO«ÿôØYÚ© Ì1TFç‚1õ†‹òUyJ'ì¤Ý}"~¡˜ê®M«Võùµ' loop2: detected capacity change from 0 to 136 iso9660: Unknown parameter 'Bð™šNÌå—³Î™XðÅ¦ñás¨P%Ã×˜x«½¾Z$E@ž¥wpÞ0ÛÓŸWÙjµ¼Ü0t¶—ÃCºa†ú–ÔYˆÝu`@£4¾±3D€f6CgÜinˆK!‡Ú®¿³î?(Rúœ˜/é`Aáaö»>3îtMZéâÔ½¥ú<¼Õ}¿*XßP#£‰úñ}â?hˆO«ÿôØYÚ© Ì1TFç‚1õ†‹òUyJ'ì¤Ý}"~¡˜ê®M«Võùµ' audit: type=1326 audit(1763100183.116:16): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4413 comm="syz-executor.7" exe="/syz-executor.7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5004a70b19 code=0x0 audit: type=1326 audit(1763100190.768:17): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4461 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0019fdb19 code=0x0 audit: type=1326 audit(1763100191.602:18): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4461 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0019fdb19 code=0x0 Bluetooth: hci6: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci3: command 0x0406 tx timeout ---------------- Code disassembly (best guess): 0: 0f 85 b4 03 00 00 jne 0x3ba 6: 4c 8b 65 38 mov 0x38(%rbp),%r12 a: 4d 85 e4 test %r12,%r12 d: 74 41 je 0x50 f: e8 2b 48 30 00 callq 0x30483f 14: 49 8d 7c 24 30 lea 0x30(%r12),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 b8 03 00 00 jne 0x3ec 34: 49 8b 5c 24 30 mov 0x30(%r12),%rbx 39: bf 08 00 00 00 mov $0x8,%edi 3e: 48 rex.W 3f: 89 .byte 0x89