[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.739916][ T27] audit: type=1800 audit(1575464318.132:25): pid=8981 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.768931][ T27] audit: type=1800 audit(1575464318.132:26): pid=8981 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.814496][ T27] audit: type=1800 audit(1575464318.132:27): pid=8981 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 '10.128.15.196' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.364771][ T9136] IPVS: ftp: loaded support on port[0] = 21 [ 69.398778][ T3669] BUG: unable to handle page fault for address: fffff52000600000 [ 69.406717][ T3669] #PF: supervisor read access in kernel mode [ 69.412808][ T3669] #PF: error_code(0x0000) - not-present page [ 69.419057][ T3669] PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a7c3a067 PTE 0 [ 69.426521][ T3669] Oops: 0000 [#1] PREEMPT SMP KASAN [ 69.431697][ T3669] CPU: 0 PID: 3669 Comm: ion_system_heap Not tainted 5.4.0-syzkaller #0 [ 69.439998][ T3669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.450052][ T3669] RIP: 0010:check_memory_region+0x9c/0x1a0 [ 69.455858][ T3669] 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 [ 69.475457][ T3669] RSP: 0018:ffffc9000cb1fab8 EFLAGS: 00010212 [ 69.481510][ T3669] RAX: fffff52000600000 RBX: fffff52000601600 RCX: ffffffff85dd6029 [ 69.489461][ T3669] RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003000000 [ 69.497512][ T3669] RBP: ffffc9000cb1fad0 R08: fffff52000601600 R09: 0000000000001600 [ 69.505915][ T3669] R10: fffff520006015ff R11: ffffc9000300afff R12: fffff52000600000 [ 69.513891][ T3669] R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cb1fd08 [ 69.521913][ T3669] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 69.530855][ T3669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.537442][ T3669] CR2: fffff52000600000 CR3: 00000000a9783000 CR4: 00000000001406f0 [ 69.545429][ T3669] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.553427][ T3669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.561506][ T3669] Call Trace: [ 69.564797][ T3669] memset+0x24/0x40 [ 69.568611][ T3669] ion_heap_clear_pages+0x49/0x70 [ 69.573641][ T3669] ion_heap_sglist_zero+0x245/0x270 [ 69.578828][ T3669] ? ion_heap_deferred_free+0x630/0x630 [ 69.584401][ T3669] ? mark_lock+0xc2/0x1220 [ 69.588843][ T3669] ? __kasan_check_read+0x11/0x20 [ 69.593874][ T3669] ? __lock_acquire+0x16f2/0x4a00 [ 69.598905][ T3669] ? finish_wait+0x18c/0x260 [ 69.603572][ T3669] ? find_held_lock+0x35/0x130 [ 69.608341][ T3669] ? ion_heap_deferred_free+0x295/0x630 [ 69.613885][ T3669] ? pgprot_writecombine+0x5e/0xf0 [ 69.619000][ T3669] ? pagerange_is_ram_callback+0x130/0x130 [ 69.624939][ T3669] ? ion_heap_deferred_free+0x295/0x630 [ 69.630484][ T3669] ion_heap_buffer_zero+0xf5/0x150 [ 69.635692][ T3669] ion_system_heap_free+0x1eb/0x250 [ 69.640902][ T3669] ion_buffer_destroy+0x159/0x2d0 [ 69.646025][ T3669] ion_heap_deferred_free+0x29d/0x630 [ 69.651405][ T3669] ? ion_heap_shrink_scan+0x1d0/0x1d0 [ 69.656778][ T3669] ? trace_hardirqs_on+0x67/0x240 [ 69.661908][ T3669] ? finish_wait+0x260/0x260 [ 69.666522][ T3669] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 69.672817][ T3669] ? __kthread_parkme+0x108/0x1c0 [ 69.677855][ T3669] ? __kasan_check_read+0x11/0x20 [ 69.682881][ T3669] kthread+0x361/0x430 [ 69.686947][ T3669] ? ion_heap_shrink_scan+0x1d0/0x1d0 [ 69.692322][ T3669] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 69.698037][ T3669] ret_from_fork+0x24/0x30 [ 69.702445][ T3669] Modules linked in: [ 69.706355][ T3669] CR2: fffff52000600000 [ 69.710523][ T3669] ---[ end trace 856c39a2ca08db54 ]--- [ 69.715972][ T3669] RIP: 0010:check_memory_region+0x9c/0x1a0 [ 69.721773][ T3669] 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 [ 69.741439][ T3669] RSP: 0018:ffffc9000cb1fab8 EFLAGS: 00010212 [ 69.747491][ T3669] RAX: fffff52000600000 RBX: fffff52000601600 RCX: ffffffff85dd6029 [ 69.755564][ T3669] RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003000000 [ 69.763522][ T3669] RBP: ffffc9000cb1fad0 R08: fffff52000601600 R09: 0000000000001600 [ 69.771563][ T3669] R10: fffff520006015ff R11: ffffc9000300afff R12: fffff52000600000 [ 69.779525][ T3669] R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cb1fd08 [ 69.787478][ T3669] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 69.796396][ T3669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.802961][ T3669] CR2: fffff52000600000 CR3: 00000000a9783000 CR4: 00000000001406f0 [ 69.810932][ T3669] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.818883][ T3669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.826848][ T3669] Kernel panic - not syncing: Fatal exception [ 69.834401][ T3669] Kernel Offset: disabled [ 69.838752][ T3669] Rebooting in 86400 seconds..