[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 59.025219][ T6999] IPVS: ftp: loaded support on port[0] = 21
[ 59.156817][ C0] ------------[ cut here ]------------
[ 59.162354][ C0] kernel BUG at net/l2tp/l2tp_core.c:1572!
[ 59.168452][ C0] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 59.174519][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-syzkaller #0
[ 59.182047][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 59.192103][ C0] RIP: 0010:l2tp_session_free+0x218/0x250
[ 59.197798][ C0] Code: 89 ef e8 1b 04 5a fc e9 4b ff ff ff e8 51 94 33 fa 4c 89 e7 e8 b9 c8 e1 fe e9 39 ff ff ff e8 3f 94 33 fa 0f 0b e8 38 94 33 fa <0f> 0b 4c 89 e7 e8 7e a9 72 fa e9 48 fe ff ff 48 89 df e8 71 a9 72
[ 59.217421][ C0] RSP: 0018:ffffc90000007d28 EFLAGS: 00010246
[ 59.223487][ C0] RAX: ffffffff89886580 RBX: ffff8880a7533c00 RCX: ffffffff8740393d
[ 59.231445][ C0] RDX: 0000000000000000 RSI: ffffffff87403a88 RDI: 0000000000000005
[ 59.239404][ C0] RBP: ffff88809f334000 R08: ffffffff89886580 R09: ffffed1013e6681a
[ 59.247394][ C0] R10: ffff88809f3340cb R11: ffffed1013e66819 R12: 0000000000000000
[ 59.255381][ C0] R13: ffff88809f7774a8 R14: ffffc90000007e98 R15: ffffffff89886580
[ 59.272365][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[ 59.281274][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 59.287842][ C0] CR2: 000000000049f410 CR3: 0000000009879000 CR4: 00000000001406f0
[ 59.295901][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 59.303842][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 59.311786][ C0] Call Trace:
[ 59.315043][ C0]
[ 59.317883][ C0] pppol2tp_session_destruct+0x12e/0x180
[ 59.323483][ C0] ? pppol2tp_recvmsg+0x270/0x270
[ 59.328475][ C0] __sk_destruct+0x4b/0x7c0
[ 59.332973][ C0] sk_destruct+0xc6/0x100
[ 59.337279][ C0] __sk_free+0xef/0x3d0
[ 59.341415][ C0] sk_free+0x78/0xa0
[ 59.345277][ C0] pppol2tp_put_sk+0x9b/0xd0
[ 59.349848][ C0] rcu_core+0x59f/0x1370
[ 59.354058][ C0] ? __rcu_read_unlock+0x560/0x560
[ 59.359154][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 59.364682][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 59.370641][ C0] __do_softirq+0x26c/0x9f7
[ 59.375132][ C0] irq_exit+0x192/0x1d0
[ 59.379271][ C0] smp_apic_timer_interrupt+0x19e/0x600
[ 59.384782][ C0] apic_timer_interrupt+0xf/0x20
[ 59.389686][ C0]
[ 59.392597][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 59.397936][ C0] Code: cc cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 84 9c 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 74 9c 4a 00 fb f4 cc 41 56 41 55 41 54 55 53 e8 33 9c 83 f9 e8 be c8 bf fb 0f 1f
[ 59.417520][ C0] RSP: 0018:ffffffff89807c50 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
[ 59.425909][ C0] RAX: ffffffff89886580 RBX: 0000000000000000 RCX: 1ffffffff15173ba
[ 59.433897][ C0] RDX: 0000000000000000 RSI: ffffffff87de1248 RDI: ffffffff89886e00
[ 59.441841][ C0] RBP: ffff88821a882064 R08: 0000000000000000 R09: 0000000000000001
[ 59.449780][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88821a882064
[ 59.457735][ C0] R13: 1ffffffff1300f95 R14: ffff88821a882065 R15: 0000000000000001
[ 59.465699][ C0] ? acpi_safe_halt+0x88/0x110
[ 59.470432][ C0] acpi_safe_halt+0x8d/0x110
[ 59.475005][ C0] acpi_idle_do_entry+0xa9/0xe0
[ 59.479828][ C0] acpi_idle_enter+0x437/0xb20
[ 59.484589][ C0] ? acpi_idle_enter_bm+0x2d0/0x2d0
[ 59.489773][ C0] ? kvm_clock_read+0x14/0x30
[ 59.494444][ C0] ? kvm_sched_clock_read+0x5/0x10
[ 59.499541][ C0] ? sched_clock+0x2a/0x40
[ 59.503926][ C0] ? sched_clock_cpu+0x18/0x1b0
[ 59.508851][ C0] cpuidle_enter_state+0xdd/0xd60
[ 59.513861][ C0] ? assoc_array_gc+0x1200/0x1250
[ 59.518854][ C0] cpuidle_enter+0x4a/0xa0
[ 59.523610][ C0] do_idle+0x42f/0x690
[ 59.527650][ C0] ? arch_cpu_idle_exit+0x70/0x70
[ 59.532662][ C0] ? schedule+0xe7/0x2a0
[ 59.536889][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[ 59.543234][ C0] cpu_startup_entry+0x14/0x20
[ 59.547969][ C0] start_kernel+0x9be/0x9fb
[ 59.552458][ C0] ? mem_encrypt_init+0x5/0x5
[ 59.557137][ C0] ? x86_family+0x3d/0x50
[ 59.561439][ C0] ? load_ucode_bsp+0x23d/0x27d
[ 59.566280][ C0] secondary_startup_64+0xa4/0xb0
[ 59.571272][ C0] Modules linked in:
[ 59.575222][ C0] ---[ end trace 0a2a6f126636213c ]---
[ 59.580702][ C0] RIP: 0010:l2tp_session_free+0x218/0x250
[ 59.586453][ C0] Code: 89 ef e8 1b 04 5a fc e9 4b ff ff ff e8 51 94 33 fa 4c 89 e7 e8 b9 c8 e1 fe e9 39 ff ff ff e8 3f 94 33 fa 0f 0b e8 38 94 33 fa <0f> 0b 4c 89 e7 e8 7e a9 72 fa e9 48 fe ff ff 48 89 df e8 71 a9 72
[ 59.606221][ C0] RSP: 0018:ffffc90000007d28 EFLAGS: 00010246
[ 59.612305][ C0] RAX: ffffffff89886580 RBX: ffff8880a7533c00 RCX: ffffffff8740393d
[ 59.620280][ C0] RDX: 0000000000000000 RSI: ffffffff87403a88 RDI: 0000000000000005
[ 59.628276][ C0] RBP: ffff88809f334000 R08: ffffffff89886580 R09: ffffed1013e6681a
[ 59.636261][ C0] R10: ffff88809f3340cb R11: ffffed1013e66819 R12: 0000000000000000
[ 59.644211][ C0] R13: ffff88809f7774a8 R14: ffffc90000007e98 R15: ffffffff89886580
[ 59.652195][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[ 59.661168][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 59.667775][ C0] CR2: 000000000049f410 CR3: 0000000009879000 CR4: 00000000001406f0
[ 59.675729][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 59.683716][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 59.691723][ C0] Kernel panic - not syncing: Fatal exception in interrupt
[ 59.700354][ C0] Kernel Offset: disabled
[ 59.704689][ C0] Rebooting in 86400 seconds..