[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.165934][ T25] audit: type=1800 audit(1575508264.490:25): pid=9022 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.186613][ T25] audit: type=1800 audit(1575508264.490:26): pid=9022 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.223911][ T25] audit: type=1800 audit(1575508264.490:27): pid=9022 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.711525][ T9175] IPVS: ftp: loaded support on port[0] = 21 [ 74.746500][ T3672] BUG: unable to handle page fault for address: fffff52000500000 [ 74.754266][ T3672] #PF: supervisor read access in kernel mode [ 74.760226][ T3672] #PF: error_code(0x0000) - not-present page [ 74.766178][ T3672] PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a8b15067 PTE 0 [ 74.773622][ T3672] Oops: 0000 [#1] PREEMPT SMP KASAN [ 74.778833][ T3672] CPU: 0 PID: 3672 Comm: ion_system_heap Not tainted 5.4.0-syzkaller #0 [ 74.787169][ T3672] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.797237][ T3672] RIP: 0010:check_memory_region+0x9c/0x1a0 [ 74.803039][ T3672] Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 [ 74.822690][ T3672] RSP: 0018:ffffc9000cb27ab8 EFLAGS: 00010212 [ 74.828756][ T3672] RAX: fffff52000500000 RBX: fffff52000501600 RCX: ffffffff85dd6029 [ 74.836840][ T3672] RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90002800000 [ 74.844905][ T3672] RBP: ffffc9000cb27ad0 R08: fffff52000501600 R09: 0000000000001600 [ 74.852858][ T3672] R10: fffff520005015ff R11: ffffc9000280afff R12: fffff52000500000 [ 74.861549][ T3672] R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cb27d08 [ 74.869554][ T3672] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 74.878465][ T3672] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.885031][ T3672] CR2: fffff52000500000 CR3: 00000000a03c7000 CR4: 00000000001406f0 [ 74.893020][ T3672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.900987][ T3672] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.908984][ T3672] Call Trace: [ 74.912275][ T3672] memset+0x24/0x40 [ 74.916074][ T3672] ion_heap_clear_pages+0x49/0x70 [ 74.921202][ T3672] ion_heap_sglist_zero+0x245/0x270 [ 74.927609][ T3672] ? ion_heap_deferred_free+0x630/0x630 [ 74.933146][ T3672] ? mark_lock+0xc2/0x1220 [ 74.937565][ T3672] ? __kasan_check_read+0x11/0x20 [ 74.942706][ T3672] ? __lock_acquire+0x16f2/0x4a00 [ 74.947784][ T3672] ? finish_wait+0x18c/0x260 [ 74.952362][ T3672] ? find_held_lock+0x35/0x130 [ 74.957129][ T3672] ? ion_heap_deferred_free+0x295/0x630 [ 74.962732][ T3672] ? pgprot_writecombine+0x5e/0xf0 [ 74.967900][ T3672] ? pagerange_is_ram_callback+0x130/0x130 [ 74.973719][ T3672] ? ion_heap_deferred_free+0x295/0x630 [ 74.979276][ T3672] ion_heap_buffer_zero+0xf5/0x150 [ 74.984397][ T3672] ion_system_heap_free+0x1eb/0x250 [ 74.989842][ T3672] ion_buffer_destroy+0x159/0x2d0 [ 74.994883][ T3672] ion_heap_deferred_free+0x29d/0x630 [ 75.000259][ T3672] ? ion_heap_shrink_scan+0x1d0/0x1d0 [ 75.005616][ T3672] ? trace_hardirqs_on+0x67/0x240 [ 75.010620][ T3672] ? finish_wait+0x260/0x260 [ 75.015201][ T3672] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 75.021543][ T3672] ? __kthread_parkme+0x108/0x1c0 [ 75.026846][ T3672] ? __kasan_check_read+0x11/0x20 [ 75.031970][ T3672] kthread+0x361/0x430 [ 75.036145][ T3672] ? ion_heap_shrink_scan+0x1d0/0x1d0 [ 75.041588][ T3672] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 75.047421][ T3672] ret_from_fork+0x24/0x30 [ 75.051978][ T3672] Modules linked in: [ 75.055947][ T3672] CR2: fffff52000500000 [ 75.060105][ T3672] ---[ end trace b66f2e8e9330590f ]--- [ 75.065563][ T3672] RIP: 0010:check_memory_region+0x9c/0x1a0 [ 75.071419][ T3672] Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 [ 75.091414][ T3672] RSP: 0018:ffffc9000cb27ab8 EFLAGS: 00010212 [ 75.097626][ T3672] RAX: fffff52000500000 RBX: fffff52000501600 RCX: ffffffff85dd6029 [ 75.105593][ T3672] RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90002800000 [ 75.113947][ T3672] RBP: ffffc9000cb27ad0 R08: fffff52000501600 R09: 0000000000001600 [ 75.121944][ T3672] R10: fffff520005015ff R11: ffffc9000280afff R12: fffff52000500000 [ 75.130209][ T3672] R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cb27d08 [ 75.138375][ T3672] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 75.147382][ T3672] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.153951][ T3672] CR2: fffff52000500000 CR3: 00000000a03c7000 CR4: 00000000001406f0 [ 75.162697][ T3672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.170656][ T3672] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.178630][ T3672] Kernel panic - not syncing: Fatal exception [ 75.185912][ T3672] Kernel Offset: disabled [ 75.190252][ T3672] Rebooting in 86400 seconds..