[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.229' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.158470] audit: type=1400 audit(1597268735.201:8): avc: denied { execmem } for pid=6450 comm="syz-executor965" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 40.160433] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1355 [ 40.187079] in_atomic(): 0, irqs_disabled(): 0, pid: 6450, name: syz-executor965 [ 40.194773] 3 locks held by syz-executor965/6450: [ 40.199602] #0: 00000000609f222e (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0x98d/0xf60 [ 40.208242] #1: 0000000094084125 (rcu_read_lock){....}, at: ctnetlink_create_conntrack+0x199/0x12c0 [ 40.217605] #2: 0000000067cf2982 (&mm->mmap_sem){++++}, at: __do_page_fault+0x3e2/0xde0 [ 40.225895] Preemption disabled at: [ 40.225913] [] rcu_lockdep_current_cpu_online+0x32/0x1b0 [ 40.236596] CPU: 1 PID: 6450 Comm: syz-executor965 Not tainted 4.19.139-syzkaller #0 [ 40.244456] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.253787] Call Trace: [ 40.256363] dump_stack+0x1fc/0x2fe [ 40.259975] ? rcu_lockdep_current_cpu_online+0x32/0x1b0 [ 40.265406] ___might_sleep.cold+0x235/0x250 [ 40.269798] __do_page_fault+0x40d/0xde0 [ 40.273843] ? trace_hardirqs_off_caller+0x69/0x210 [ 40.278925] ? spurious_fault+0x840/0x840 [ 40.283060] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.287889] page_fault+0x1e/0x30 [ 40.291322] RIP: 0010: (null) [ 40.295200] Code: Bad RIP value. [ 40.298542] RSP: 0018:ffff888089a97190 EFLAGS: 00010246 [ 40.303884] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85ee5a6b [ 40.311134] RDX: 1ffffffff135eabe RSI: ffff888089a97210 RDI: ffff888089a97260 [ 40.318385] RBP: ffff888099edadc0 R08: 0000000000000001 R09: 0000000000000000 [ 40.325634] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 40.332908] R13: 0000000000000001 R14: ffffffff89af55b8 R15: ffff888089a97210 [ 40.340173] ? nfnetlink_parse_nat_setup+0x20b/0x640 [ 40.345265] ? nfnetlink_parse_nat_setup+0x243/0x640 [ 40.350347] ? nf_nat_inet_fn+0xb00/0xb00 [ 40.354479] ? lock_downgrade+0x720/0x720 [ 40.358610] ? do_raw_spin_lock+0xcb/0x220 [ 40.362835] ? ctnetlink_parse_nat_setup+0xb6/0x640 [ 40.367831] ? ctnetlink_create_conntrack+0x4bb/0x12c0 [ 40.373092] ? ctnetlink_change_synproxy.isra.0+0x380/0x380 [ 40.378785] ? hash_conntrack_raw+0x2d6/0x460 [ 40.383263] ? nf_ct_get_tuplepr+0x310/0x310 [ 40.387679] ? nf_ct_gc_expired+0x300/0x300 [ 40.391981] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 40.396375] ? ctnetlink_new_conntrack+0x4f3/0xde0 [ 40.401286] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 40.406628] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 40.411021] ? nfnetlink_rcv_msg+0x95a/0xf60 [ 40.415433] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 40.420788] ? nfnetlink_rcv_msg+0xc4f/0xf60 [ 40.425192] ? nfnetlink_net_exit_batch+0x150/0x150 [ 40.430207] ? __lock_acquire+0x6de/0x3ff0 [ 40.434432] ? cred_has_capability.isra.0+0x139/0x2b0 [ 40.439602] ? cred_has_capability.isra.0+0x1b0/0x2b0 [ 40.444775] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 40.449718] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 40.454641] ? netlink_rcv_skb+0x160/0x440 [ 40.458916] ? nfnetlink_net_exit_batch+0x150/0x150 [ 40.463928] ? netlink_ack+0xae0/0xae0 [ 40.467811] ? ns_capable+0xde/0x100 [ 40.471512] ? nfnetlink_rcv+0x1b2/0x41b [ 40.475560] ? nfnetlink_rcv_batch+0x1df0/0x1df0 [ 40.480305] ? netlink_unicast+0x4d5/0x690 [ 40.484526] ? netlink_sendskb+0x110/0x110 [ 40.488747] ? netlink_sendmsg+0x6bb/0xc40 [ 40.492967] ? nlmsg_notify+0x1a0/0x1a0 [ 40.496922] ? kernel_recvmsg+0x220/0x220 [ 40.501053] ? nlmsg_notify+0x1a0/0x1a0 [ 40.505008] ? sock_sendmsg+0xc3/0x120 [ 40.508879] ? ___sys_sendmsg+0x7bb/0x8e0 [ 40.513028] ? copy_msghdr_from_user+0x440/0x440 [ 40.517783] ? do_huge_pmd_anonymous_page+0x939/0x1cc0 [ 40.523057] ? prep_transhuge_page+0xa0/0xa0 [ 40.527506] ? check_preemption_disabled+0x41/0x280 [ 40.532512] ? mark_held_locks+0xf0/0xf0 [ 40.536563] ? __handle_mm_fault+0xf34/0x41c0 [ 40.541048] ? errseq_sample+0x56/0x70 [ 40.544942] ? vm_insert_page+0x9c0/0x9c0 [ 40.549076] ? __do_page_fault+0x71b/0xde0 [ 40.553300] ? __fdget+0x1a0/0x230 [ 40.556823] ? __x64_sys_sendmsg+0x132/0x220 [ 40.561294] ? __sys_sendmsg+0x1b0/0x1b0 [ 40.565345] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 40.570102] ? trace_hardirqs_off_caller+0x69/0x210 [ 40.575109] ? do_syscall_64+0x21/0x620 [ 40.579066] ? do_syscall_64+0xf9/0x620 [ 40.583029] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.588581] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 40.596550] PGD a57c0067 P4D a57c0067 PUD 9535b067 PMD 0 [ 40.602101] Oops: 0010 [#1] PREEMPT SMP KASAN [ 40.606600] CPU: 1 PID: 6450 Comm: syz-executor965 Tainted: G W 4.19.139-syzkaller #0 [ 40.615859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.625247] RIP: 0010: (null) [ 40.629128] Code: Bad RIP value. [ 40.632474] RSP: 0018:ffff888089a97190 EFLAGS: 00010246 [ 40.637825] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85ee5a6b [ 40.645075] RDX: 1ffffffff135eabe RSI: ffff888089a97210 RDI: ffff888089a97260 [ 40.652331] RBP: ffff888099edadc0 R08: 0000000000000001 R09: 0000000000000000 [ 40.659585] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 40.666835] R13: 0000000000000001 R14: ffffffff89af55b8 R15: ffff888089a97210 [ 40.674086] FS: 000000000233a880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 40.682286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.688145] CR2: ffffffffffffffd6 CR3: 000000008b676000 CR4: 00000000001406e0 [ 40.695545] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.703189] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.710438] Call Trace: [ 40.713023] nfnetlink_parse_nat_setup+0x243/0x640 [ 40.717941] ? nf_nat_inet_fn+0xb00/0xb00 [ 40.722067] ? lock_downgrade+0x720/0x720 [ 40.726379] ? do_raw_spin_lock+0xcb/0x220 [ 40.730599] ctnetlink_parse_nat_setup+0xb6/0x640 [ 40.735428] ctnetlink_create_conntrack+0x4bb/0x12c0 [ 40.740512] ? ctnetlink_change_synproxy.isra.0+0x380/0x380 [ 40.746614] ? hash_conntrack_raw+0x2d6/0x460 [ 40.751092] ? nf_ct_get_tuplepr+0x310/0x310 [ 40.755482] ? nf_ct_gc_expired+0x300/0x300 [ 40.759785] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 40.764188] ctnetlink_new_conntrack+0x4f3/0xde0 [ 40.768927] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 40.774271] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 40.778658] ? nfnetlink_rcv_msg+0x95a/0xf60 [ 40.783049] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 40.788392] nfnetlink_rcv_msg+0xc4f/0xf60 [ 40.792718] ? nfnetlink_net_exit_batch+0x150/0x150 [ 40.797720] ? __lock_acquire+0x6de/0x3ff0 [ 40.801938] ? cred_has_capability.isra.0+0x139/0x2b0 [ 40.807113] ? cred_has_capability.isra.0+0x1b0/0x2b0 [ 40.812278] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 40.817187] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 40.822096] netlink_rcv_skb+0x160/0x440 [ 40.826136] ? nfnetlink_net_exit_batch+0x150/0x150 [ 40.831131] ? netlink_ack+0xae0/0xae0 [ 40.835001] ? ns_capable+0xde/0x100 [ 40.838695] nfnetlink_rcv+0x1b2/0x41b [ 40.842661] ? nfnetlink_rcv_batch+0x1df0/0x1df0 [ 40.847396] netlink_unicast+0x4d5/0x690 [ 40.851436] ? netlink_sendskb+0x110/0x110 [ 40.855652] netlink_sendmsg+0x6bb/0xc40 [ 40.859692] ? nlmsg_notify+0x1a0/0x1a0 [ 40.863647] ? kernel_recvmsg+0x220/0x220 [ 40.867775] ? nlmsg_notify+0x1a0/0x1a0 [ 40.871725] sock_sendmsg+0xc3/0x120 [ 40.875419] ___sys_sendmsg+0x7bb/0x8e0 [ 40.879372] ? copy_msghdr_from_user+0x440/0x440 [ 40.884107] ? do_huge_pmd_anonymous_page+0x939/0x1cc0 [ 40.889364] ? prep_transhuge_page+0xa0/0xa0 [ 40.893752] ? check_preemption_disabled+0x41/0x280 [ 40.898750] ? mark_held_locks+0xf0/0xf0 [ 40.902791] ? __handle_mm_fault+0xf34/0x41c0 [ 40.907268] ? errseq_sample+0x56/0x70 [ 40.911132] ? vm_insert_page+0x9c0/0x9c0 [ 40.915263] ? __do_page_fault+0x71b/0xde0 [ 40.919484] ? __fdget+0x1a0/0x230 [ 40.923003] __x64_sys_sendmsg+0x132/0x220 [ 40.927214] ? __sys_sendmsg+0x1b0/0x1b0 [ 40.931256] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 40.935992] ? trace_hardirqs_off_caller+0x69/0x210 [ 40.940986] ? do_syscall_64+0x21/0x620 [ 40.944956] do_syscall_64+0xf9/0x620 [ 40.948737] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.953906] RIP: 0033:0x440679 [ 40.957096] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 40.975975] RSP: 002b:00007ffebde623d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 40.983682] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440679 [ 40.990943] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 40.998192] RBP: 00000000006ca018 R08: 0000000000000001 R09: 00000000004002c8 [ 41.005439] R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000401e80 [ 41.012686] R13: 0000000000401f10 R14: 0000000000000000 R15: 0000000000000000 [ 41.019956] Modules linked in: [ 41.023128] CR2: 0000000000000000 [ 41.026831] ---[ end trace 554925b4799703e8 ]--- [ 41.031591] RIP: 0010: (null) [ 41.035744] Code: Bad RIP value. [ 41.039116] RSP: 0018:ffff888089a97190 EFLAGS: 00010246 [ 41.044529] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85ee5a6b [ 41.051898] RDX: 1ffffffff135eabe RSI: ffff888089a97210 RDI: ffff888089a97260 [ 41.059258] RBP: ffff888099edadc0 R08: 0000000000000001 R09: 0000000000000000 [ 41.066583] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 41.073885] R13: 0000000000000001 R14: ffffffff89af55b8 R15: ffff888089a97210 [ 41.081148] FS: 000000000233a880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 41.089406] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.095562] CR2: ffffffffffffffd6 CR3: 000000008b676000 CR4: 00000000001406e0 [ 41.102859] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.110119] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.117411] Kernel panic - not syncing: Fatal exception [ 41.124160] Kernel Offset: disabled [ 41.127788] Rebooting in 86400 seconds..