[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 64.312731][ T26] audit: type=1800 audit(1575707572.846:25): pid=8994 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 64.337168][ T26] audit: type=1800 audit(1575707572.846:26): pid=8994 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 64.369889][ T26] audit: type=1800 audit(1575707572.856:27): pid=8994 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 '10.128.0.149' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.758920][ T9147] IPVS: ftp: loaded support on port[0] = 21 [ 74.795122][ T3675] BUG: unable to handle page fault for address: fffff52000680000 [ 74.803136][ T3675] #PF: supervisor read access in kernel mode [ 74.809108][ T3675] #PF: error_code(0x0000) - not-present page [ 74.815218][ T3675] PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a8168067 PTE 0 [ 74.822706][ T3675] Oops: 0000 [#1] PREEMPT SMP KASAN [ 74.827940][ T3675] CPU: 1 PID: 3675 Comm: ion_system_heap Not tainted 5.4.0-next-20191206-syzkaller #0 [ 74.838006][ T3675] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.848067][ T3675] RIP: 0010:check_memory_region+0x9c/0x1a0 [ 74.853900][ T3675] 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 [ 74.873727][ T3675] RSP: 0018:ffffc9000c9c7ab8 EFLAGS: 00010212 [ 74.879793][ T3675] RAX: fffff52000680000 RBX: fffff52000681600 RCX: ffffffff85df4159 [ 74.887875][ T3675] RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003400000 [ 74.895932][ T3675] RBP: ffffc9000c9c7ad0 R08: fffff52000681600 R09: 0000000000001600 [ 74.903893][ T3675] R10: fffff520006815ff R11: ffffc9000340afff R12: fffff52000680000 [ 74.911882][ T3675] R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000c9c7d08 [ 74.919849][ T3675] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 74.928778][ T3675] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.935349][ T3675] CR2: fffff52000680000 CR3: 00000000a7096000 CR4: 00000000001406e0 [ 74.943335][ T3675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.951301][ T3675] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.959274][ T3675] Call Trace: [ 74.962581][ T3675] memset+0x24/0x40 [ 74.966407][ T3675] ion_heap_clear_pages+0x49/0x70 [ 74.971427][ T3675] ion_heap_sglist_zero+0x245/0x270 [ 74.976609][ T3675] ? ion_heap_deferred_free+0x630/0x630 [ 74.982141][ T3675] ? mark_lock+0xc2/0x1220 [ 74.986539][ T3675] ? __kasan_check_read+0x11/0x20 [ 74.991553][ T3675] ? __lock_acquire+0x16f2/0x4a00 [ 74.996558][ T3675] ? finish_wait+0x18c/0x260 [ 75.001150][ T3675] ? find_held_lock+0x35/0x130 [ 75.006005][ T3675] ? ion_heap_deferred_free+0x295/0x630 [ 75.011645][ T3675] ? pgprot_writecombine+0x5e/0xf0 [ 75.016977][ T3675] ? pagerange_is_ram_callback+0x130/0x130 [ 75.022949][ T3675] ? ion_heap_deferred_free+0x295/0x630 [ 75.028514][ T3675] ion_heap_buffer_zero+0xf5/0x150 [ 75.033746][ T3675] ion_system_heap_free+0x1eb/0x250 [ 75.038966][ T3675] ion_buffer_destroy+0x159/0x2d0 [ 75.043992][ T3675] ion_heap_deferred_free+0x29d/0x630 [ 75.049353][ T3675] ? ion_heap_shrink_scan+0x1d0/0x1d0 [ 75.054848][ T3675] ? trace_hardirqs_on+0x67/0x240 [ 75.061115][ T3675] ? finish_wait+0x260/0x260 [ 75.065700][ T3675] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 75.071932][ T3675] ? __kthread_parkme+0x108/0x1c0 [ 75.076951][ T3675] ? __kasan_check_read+0x11/0x20 [ 75.081991][ T3675] kthread+0x361/0x430 [ 75.086359][ T3675] ? ion_heap_shrink_scan+0x1d0/0x1d0 [ 75.091731][ T3675] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 75.097440][ T3675] ret_from_fork+0x24/0x30 [ 75.101834][ T3675] Modules linked in: [ 75.105726][ T3675] CR2: fffff52000680000 [ 75.109996][ T3675] ---[ end trace 02f3a368bc239bac ]--- [ 75.115476][ T3675] RIP: 0010:check_memory_region+0x9c/0x1a0 [ 75.121460][ T3675] 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 [ 75.141581][ T3675] RSP: 0018:ffffc9000c9c7ab8 EFLAGS: 00010212 [ 75.147642][ T3675] RAX: fffff52000680000 RBX: fffff52000681600 RCX: ffffffff85df4159 [ 75.155619][ T3675] RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003400000 [ 75.164116][ T3675] RBP: ffffc9000c9c7ad0 R08: fffff52000681600 R09: 0000000000001600 [ 75.172152][ T3675] R10: fffff520006815ff R11: ffffc9000340afff R12: fffff52000680000 [ 75.180457][ T3675] R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000c9c7d08 [ 75.188428][ T3675] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 75.197646][ T3675] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.204229][ T3675] CR2: fffff52000680000 CR3: 00000000a7096000 CR4: 00000000001406e0 [ 75.212188][ T3675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.220563][ T3675] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.228550][ T3675] Kernel panic - not syncing: Fatal exception [ 75.236095][ T3675] Kernel Offset: disabled [ 75.240444][ T3675] Rebooting in 86400 seconds..