[....] 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..