Warning: Permanently added '10.128.0.64' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 90.144102][ T25] audit: type=1400 audit(1634993906.006:8): avc: denied { execmem } for pid=6540 comm="syz-executor161" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 90.146573][ T6540] ------------[ cut here ]------------ [ 90.172091][ T6540] refcount_t: addition on 0; use-after-free. [ 90.178798][ T6540] WARNING: CPU: 0 PID: 6540 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 [ 90.188343][ T6540] Modules linked in: [ 90.192280][ T6540] CPU: 0 PID: 6540 Comm: syz-executor161 Not tainted 5.15.0-rc6-syzkaller #0 [ 90.201168][ T6540] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.211469][ T6540] RIP: 0010:refcount_warn_saturate+0x169/0x1e0 [ 90.217710][ T6540] Code: 09 31 ff 89 de e8 87 b4 9b fd 84 db 0f 85 36 ff ff ff e8 ca ac 9b fd 48 c7 c7 c0 65 e3 89 c6 05 ff 56 7f 09 01 e8 0d 45 19 05 <0f> 0b e9 17 ff ff ff e8 ab ac 9b fd 0f b6 1d e4 56 7f 09 31 ff 89 [ 90.237430][ T6540] RSP: 0018:ffffc9000c7a7f10 EFLAGS: 00010286 [ 90.243496][ T6540] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 90.251513][ T6540] RDX: ffff888073be0300 RSI: ffffffff815dcf58 RDI: fffff520018f4fd4 [ 90.259570][ T6540] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 90.267606][ T6540] R10: ffffffff815d6cce R11: 0000000000000000 R12: 0000000000000000 [ 90.275595][ T6540] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 90.283632][ T6540] FS: 0000555556a3f300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 90.292659][ T6540] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 90.299342][ T6540] CR2: 00007f1bacc3b6c0 CR3: 00000000214ae000 CR4: 00000000003506f0 [ 90.307462][ T6540] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 90.315443][ T6540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 90.323509][ T6540] Call Trace: [ 90.326862][ T6540] __x64_sys_memfd_secret+0x182/0x1e0 [ 90.332246][ T6540] do_syscall_64+0x35/0xb0 [ 90.336736][ T6540] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 90.342641][ T6540] RIP: 0033:0x7fc28a0a4f79 [ 90.347123][ T6540] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 90.366874][ T6540] RSP: 002b:00007ffd689c4668 EFLAGS: 00000246 ORIG_RAX: 00000000000001bf [ 90.375307][ T6540] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc28a0a4f79 [ 90.383323][ T6540] RDX: 00007fc28a067e83 RSI: 0000000000000012 RDI: 0000000000000000 [ 90.391384][ T6540] RBP: 00007fc28a068f60 R08: 0000000000000000 R09: 0000000000000000 [ 90.399422][ T6540] R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fc28a068ff0 [ 90.407488][ T6540] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 90.415465][ T6540] Kernel panic - not syncing: panic_on_warn set ... [ 90.422032][ T6540] CPU: 0 PID: 6540 Comm: syz-executor161 Not tainted 5.15.0-rc6-syzkaller #0 [ 90.430775][ T6540] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.440824][ T6540] Call Trace: [ 90.444102][ T6540] dump_stack_lvl+0xcd/0x134 [ 90.448697][ T6540] panic+0x2b0/0x6dd [ 90.452591][ T6540] ? __warn_printk+0xf3/0xf3 [ 90.457194][ T6540] ? __warn.cold+0x1a/0x44 [ 90.461622][ T6540] ? refcount_warn_saturate+0x169/0x1e0 [ 90.467168][ T6540] __warn.cold+0x35/0x44 [ 90.471406][ T6540] ? wake_up_klogd.part.0+0x8e/0xd0 [ 90.476603][ T6540] ? refcount_warn_saturate+0x169/0x1e0 [ 90.482156][ T6540] report_bug+0x1bd/0x210 [ 90.486498][ T6540] handle_bug+0x3c/0x60 [ 90.490650][ T6540] exc_invalid_op+0x14/0x40 [ 90.495149][ T6540] asm_exc_invalid_op+0x12/0x20 [ 90.500034][ T6540] RIP: 0010:refcount_warn_saturate+0x169/0x1e0 [ 90.506197][ T6540] Code: 09 31 ff 89 de e8 87 b4 9b fd 84 db 0f 85 36 ff ff ff e8 ca ac 9b fd 48 c7 c7 c0 65 e3 89 c6 05 ff 56 7f 09 01 e8 0d 45 19 05 <0f> 0b e9 17 ff ff ff e8 ab ac 9b fd 0f b6 1d e4 56 7f 09 31 ff 89 [ 90.525829][ T6540] RSP: 0018:ffffc9000c7a7f10 EFLAGS: 00010286 [ 90.531906][ T6540] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 90.539875][ T6540] RDX: ffff888073be0300 RSI: ffffffff815dcf58 RDI: fffff520018f4fd4 [ 90.547853][ T6540] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 90.555833][ T6540] R10: ffffffff815d6cce R11: 0000000000000000 R12: 0000000000000000 [ 90.563811][ T6540] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 90.571778][ T6540] ? wake_up_klogd.part.0+0x8e/0xd0 [ 90.576976][ T6540] ? vprintk+0x88/0x90 [ 90.581042][ T6540] __x64_sys_memfd_secret+0x182/0x1e0 [ 90.586427][ T6540] do_syscall_64+0x35/0xb0 [ 90.590840][ T6540] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 90.596741][ T6540] RIP: 0033:0x7fc28a0a4f79 [ 90.601151][ T6540] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 90.620985][ T6540] RSP: 002b:00007ffd689c4668 EFLAGS: 00000246 ORIG_RAX: 00000000000001bf [ 90.629422][ T6540] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc28a0a4f79 [ 90.637430][ T6540] RDX: 00007fc28a067e83 RSI: 0000000000000012 RDI: 0000000000000000 [ 90.645421][ T6540] RBP: 00007fc28a068f60 R08: 0000000000000000 R09: 0000000000000000 [ 90.653502][ T6540] R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fc28a068ff0 [ 90.661480][ T6540] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 90.669890][ T6540] Kernel Offset: disabled [ 90.674279][ T6540] Rebooting in 86400 seconds..