[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.0.69' (ECDSA) to the list of known hosts. syzkaller login: [ 79.043130][ T34] audit: type=1400 audit(1607361867.894:8): avc: denied { execmem } for pid=8485 comm="syz-executor012" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 79.081251][ T8493] IPVS: ftp: loaded support on port[0] = 21 [ 79.101793][ T8492] IPVS: ftp: loaded support on port[0] = 21 [ 79.112127][ T8494] IPVS: ftp: loaded support on port[0] = 21 [ 79.116378][ T8497] IPVS: ftp: loaded support on port[0] = 21 [ 79.124564][ T8496] IPVS: ftp: loaded support on port[0] = 21 [ 79.131971][ T8495] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 79.970063][ T8784] page:0000000086575270 refcount:1 mapcount:-1024 mapping:0000000000000000 index:0x0 pfn:0x2773a [ 79.987483][ T8784] flags: 0xfff00000000000() [ 79.998084][ T8784] raw: 00fff00000000000 dead000000000100 ffffea0000993b40 0000000000000000 [ 80.011584][ T8784] raw: 0000000000000000 ffff88801f05ac00 00000001fffffbff 0000000000000000 executing program executing program executing program executing program [ 80.028660][ T8784] page dumped because: VM_BUG_ON_PAGE(page->pmd_huge_pte) [ 80.045581][ T8784] ------------[ cut here ]------------ [ 80.061930][ T8784] kernel BUG at include/linux/mm.h:2268! [ 80.067847][ T8784] invalid opcode: 0000 [#1] PREEMPT SMP KASAN executing program executing program executing program executing program [ 80.073929][ T8784] CPU: 1 PID: 8784 Comm: syz-executor012 Not tainted 5.10.0-rc7-syzkaller #0 [ 80.082687][ T8784] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.092791][ T8784] RIP: 0010:___pmd_free_tlb+0x128/0x170 [ 80.098340][ T8784] Code: 3f 00 48 89 df 48 89 ee e8 e5 d9 fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 27 61 3f 00 48 c7 c6 20 c1 48 89 48 89 ef e8 c8 44 6f 00 <0f> 0b e8 11 61 3f 00 48 c7 c6 80 c0 48 89 48 89 ef e8 b2 44 6f 00 [ 80.117951][ T8784] RSP: 0018:ffffc90001df7908 EFLAGS: 00010292 executing program executing program executing program executing program executing program [ 80.124024][ T8784] RAX: 0000000000000000 RBX: ffffc90001df7a60 RCX: ffffffff88ae76f2 [ 80.131995][ T8784] RDX: ffff8880145a4340 RSI: ffffffff88ae7741 RDI: ffffea00009dceb8 [ 80.140106][ T8784] RBP: ffffea00009dce80 R08: 0000000000000037 R09: ffff8880b9e30627 [ 80.148083][ T8784] R10: ffffffffffffffff R11: 0000000000000000 R12: ffff88802773a000 [ 80.156063][ T8784] R13: ffffc90001df7a60 R14: ffff88802773b000 R15: 00000000211fffff [ 80.164044][ T8784] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 80.172974][ T8784] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 executing program executing program executing program executing program [ 80.179559][ T8784] CR2: 00007faaaa271db8 CR3: 000000001c071000 CR4: 00000000001506e0 [ 80.187535][ T8784] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 80.195501][ T8784] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 80.203461][ T8784] Call Trace: [ 80.206769][ T8784] free_pgd_range+0x9c0/0xc00 [ 80.211457][ T8784] free_pgtables+0x230/0x2f0 [ 80.216047][ T8784] exit_mmap+0x2c0/0x530 [ 80.220307][ T8784] ? __ia32_sys_remap_file_pages+0x150/0x150 executing program executing program executing program executing program executing program [ 80.226300][ T8784] ? kmem_cache_free+0x164/0x190 [ 80.231239][ T8784] ? __khugepaged_exit+0x2d9/0x3f0 [ 80.236357][ T8784] __mmput+0x122/0x470 [ 80.240421][ T8784] mmput+0x53/0x60 [ 80.244151][ T8784] do_exit+0xa72/0x29b0 [ 80.248328][ T8784] ? find_held_lock+0x2d/0x110 [ 80.253096][ T8784] ? mm_update_next_owner+0x7a0/0x7a0 [ 80.258469][ T8784] ? get_signal+0x34f/0x1f10 [ 80.263067][ T8784] ? lock_downgrade+0x6d0/0x6d0 [ 80.267914][ T8784] do_group_exit+0x125/0x310 [ 80.272509][ T8784] get_signal+0x42a/0x1f10 executing program executing program executing program executing program executing program [ 80.276934][ T8784] arch_do_signal+0x82/0x2390 [ 80.281629][ T8784] ? __up_read+0x1a1/0x7b0 [ 80.286048][ T8784] ? copy_siginfo_to_user32+0xa0/0xa0 [ 80.291419][ T8784] ? __do_sys_futex+0x2a2/0x470 [ 80.296270][ T8784] ? do_futex+0x1a60/0x1a60 [ 80.300798][ T8784] exit_to_user_mode_prepare+0x100/0x1a0 [ 80.306451][ T8784] syscall_exit_to_user_mode+0x38/0x260 [ 80.312000][ T8784] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 80.317916][ T8784] RIP: 0033:0x447b99 [ 80.321924][ T8784] Code: Unable to access opcode bytes at RIP 0x447b6f. executing program executing program executing program executing program [ 80.328763][ T8784] RSP: 002b:00007faaaa292db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 80.337195][ T8784] RAX: fffffffffffffe00 RBX: 00000000006e39c8 RCX: 0000000000447b99 [ 80.345250][ T8784] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006e39c8 [ 80.353223][ T8784] RBP: 00000000006e39c0 R08: 0000000000000000 R09: 0000000000000000 [ 80.361195][ T8784] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e39cc [ 80.369166][ T8784] R13: 00007ffca9e785af R14: 00007faaaa2939c0 R15: 20c49ba5e353f7cf executing program executing program executing program executing program executing program [ 80.377132][ T8784] Modules linked in: [ 80.382102][ T8784] ---[ end trace 3adfc88612f04681 ]--- [ 80.387579][ T8784] RIP: 0010:___pmd_free_tlb+0x128/0x170 [ 80.393426][ T8784] Code: 3f 00 48 89 df 48 89 ee e8 e5 d9 fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 27 61 3f 00 48 c7 c6 20 c1 48 89 48 89 ef e8 c8 44 6f 00 <0f> 0b e8 11 61 3f 00 48 c7 c6 80 c0 48 89 48 89 ef e8 b2 44 6f 00 executing program executing program executing program executing program executing program executing program [ 80.426392][ T8784] RSP: 0018:ffffc90001df7908 EFLAGS: 00010292 [ 80.438658][ T8784] RAX: 0000000000000000 RBX: ffffc90001df7a60 RCX: ffffffff88ae76f2 [ 80.446901][ T8784] RDX: ffff8880145a4340 RSI: ffffffff88ae7741 RDI: ffffea00009dceb8 [ 80.460224][ T8784] RBP: ffffea00009dce80 R08: 0000000000000037 R09: ffff8880b9e30627 [ 80.468257][ T8784] R10: ffffffffffffffff R11: 0000000000000000 R12: ffff88802773a000 executing program executing program executing program executing program executing program executing program executing program executing program [ 80.494682][ T8784] R13: ffffc90001df7a60 R14: ffff88802773b000 R15: 00000000211fffff [ 80.526249][ T8784] FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 executing program executing program executing program executing program executing program executing program [ 80.545544][ T8784] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 80.559978][ T8784] CR2: 0000000020000180 CR3: 00000000132fa000 CR4: 00000000001506f0 [ 80.573088][ T8784] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 80.582677][ T8784] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 80.600842][ T8784] Kernel panic - not syncing: Fatal exception [ 80.607616][ T8784] Kernel Offset: disabled [ 80.611929][ T8784] Rebooting in 86400 seconds..