Starting Permit User Sessions... Starting System Logging Service... Starting OpenBSD Secure Shell server... [ OK ] Started Regular background program processing daemon. Starting getty on tty2-tty6 if dbus and logind are not available... [ OK ] Started System Logging Service. [ OK ] Started Permit User Sessions. [ 52.504489][ T6553] sshd (6553) used greatest stack depth: 23256 bytes left [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ 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 Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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 '10.128.10.51' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 68.079145][ T28] audit: type=1400 audit(1600762830.377:8): avc: denied { execmem } for pid=6875 comm="syz-executor581" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 [ 83.394491][ T165] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 83.406239][ T165] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 83.414748][ T165] CPU: 1 PID: 165 Comm: kworker/u4:4 Not tainted 5.9.0-rc6-syzkaller #0 [ 83.423065][ T165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.433125][ T165] Workqueue: writeback wb_workfn (flush-8:0) [ 83.439115][ T165] RIP: 0010:__ext4_journal_get_write_access+0x6b/0x2b0 [ 83.445959][ T165] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 25 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 30 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f8 01 00 00 4c 8b 73 10 4d 85 f6 0f 84 f4 00 00 [ 83.465559][ T165] RSP: 0018:ffffc90000e56db8 EFLAGS: 00010202 [ 83.471623][ T165] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880a46d82b8 [ 83.479591][ T165] RDX: 0000000000000002 RSI: ffffffff8a067e40 RDI: 0000000000000010 [ 83.487556][ T165] RBP: ffff8880a46d82b8 R08: 0000000000000001 R09: ffff8880a8fccea0 [ 83.495525][ T165] R10: fffffbfff16b2399 R11: 0000000000000000 R12: 0000000000000001 [ 83.504455][ T165] R13: 1ffff920001cadcb R14: ffff8880986e8000 R15: 0000000000000c9d [ 83.512515][ T165] FS: 0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 83.521434][ T165] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 83.528043][ T165] CR2: 00007ffcf756a1e0 CR3: 00000000a8571000 CR4: 00000000001506e0 [ 83.536014][ T165] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 83.543984][ T165] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 83.551946][ T165] Call Trace: [ 83.555236][ T165] ? ext4_get_group_desc+0x297/0x4e0 [ 83.560525][ T165] ext4_mb_mark_diskspace_used+0x299/0x1130 [ 83.566425][ T165] ? ext4_mb_try_best_found.isra.0+0x9e0/0x9e0 [ 83.572584][ T165] ? kmem_cache_alloc+0x354/0x3f0 [ 83.577619][ T165] ext4_mb_new_blocks+0xbea/0x4720 [ 83.582736][ T165] ? ext4_ext_search_right+0x2ca/0xb30 [ 83.588193][ T165] ? ext4_inode_to_goal_block+0x2d2/0x3e0 [ 83.593928][ T165] ext4_ext_map_blocks+0x2320/0x61b0 [ 83.599220][ T165] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 83.605198][ T165] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 83.611443][ T165] ? ext4_ext_release+0x10/0x10 [ 83.616293][ T165] ? lock_acquire+0x1f3/0xaf0 [ 83.621924][ T165] ? ext4_map_blocks+0x746/0x1650 [ 83.626952][ T165] ? find_held_lock+0x2d/0x110 [ 83.631717][ T165] ? lock_release+0x8f0/0x8f0 [ 83.636394][ T165] ? ext4_es_lookup_extent+0x3b1/0xce0 [ 83.641937][ T165] ? lock_is_held_type+0xbb/0xf0 [ 83.646885][ T165] ? down_write_killable+0x170/0x170 [ 83.652169][ T165] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 83.657720][ T165] ? ext4_es_lookup_extent+0x41d/0xce0 [ 83.663177][ T165] ext4_map_blocks+0x7b8/0x1650 [ 83.668028][ T165] ? lock_is_held_type+0xbb/0xf0 [ 83.672965][ T165] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 83.678159][ T165] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 83.683719][ T165] ? kmem_cache_alloc+0x354/0x3f0 [ 83.688764][ T165] ? lock_is_held_type+0xbb/0xf0 [ 83.693708][ T165] ext4_writepages+0x1c4c/0x3960 [ 83.698654][ T165] ? mark_lock+0x82/0x1660 [ 83.703072][ T165] ? mark_held_locks+0x9f/0xe0 [ 83.707835][ T165] ? check_preemption_disabled+0x50/0x130 [ 83.713553][ T165] ? __ext4_mark_inode_dirty+0x910/0x910 [ 83.719181][ T165] ? check_preemption_disabled+0x50/0x130 [ 83.725160][ T165] ? __brelse+0x84/0xa0 [ 83.729316][ T165] ? mark_lock+0x82/0x1660 [ 83.733738][ T165] ? trace_event_raw_event_ext4_find_delalloc_range+0x27a/0x420 [ 83.741386][ T165] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 83.747370][ T165] ? ext4_da_get_block_prep+0x1120/0x1120 [ 83.753238][ T165] ? __ext4_mark_inode_dirty+0x910/0x910 [ 83.758869][ T165] do_writepages+0xec/0x290 [ 83.763379][ T165] ? writeback_set_ratelimit+0x150/0x150 [ 83.769012][ T165] ? lock_downgrade+0x830/0x830 [ 83.773910][ T165] ? writeback_sb_inodes+0x3a6/0xf40 [ 83.779194][ T165] ? lock_is_held_type+0xbb/0xf0 [ 83.784148][ T165] __writeback_single_inode+0x125/0x1400 [ 83.789781][ T165] ? _raw_spin_unlock+0x24/0x40 [ 83.794631][ T165] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 83.800606][ T165] writeback_sb_inodes+0x53d/0xf40 [ 83.805747][ T165] ? __writeback_single_inode+0x1400/0x1400 [ 83.811643][ T165] __writeback_inodes_wb+0xc6/0x280 [ 83.816844][ T165] wb_writeback+0x8bb/0xd40 [ 83.821360][ T165] ? __writeback_inodes_wb+0x280/0x280 [ 83.826820][ T165] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 83.832718][ T165] ? cpumask_next+0x3c/0x40 [ 83.837220][ T165] ? get_nr_dirty_inodes+0x1b2/0x250 [ 83.842509][ T165] wb_workfn+0x8f5/0x13e0 [ 83.847622][ T165] ? inode_wait_for_writeback+0x30/0x30 [ 83.853166][ T165] ? lock_acquire+0x1f3/0xaf0 [ 83.857842][ T165] ? process_one_work+0x85f/0x1670 [ 83.862953][ T165] ? lock_release+0x8f0/0x8f0 [ 83.867661][ T165] ? _raw_spin_unlock_irq+0x1f/0x80 [ 83.872859][ T165] ? lock_is_held_type+0xbb/0xf0 [ 83.877902][ T165] process_one_work+0x94c/0x1670 [ 83.882842][ T165] ? lock_release+0x8f0/0x8f0 [ 83.887524][ T165] ? pwq_dec_nr_in_flight+0x320/0x320 executing program executing program executing program executing program executing program [ 83.893593][ T165] ? rwlock_bug.part.0+0x90/0x90 [ 83.898531][ T165] ? lockdep_hardirqs_off+0x96/0xd0 [ 83.903853][ T165] worker_thread+0x64c/0x1120 [ 83.908540][ T165] ? __kthread_parkme+0x13f/0x1e0 [ 83.913569][ T165] ? process_one_work+0x1670/0x1670 [ 83.918778][ T165] kthread+0x3b5/0x4a0 [ 83.922847][ T165] ? __kthread_bind_mask+0xc0/0xc0 [ 83.927960][ T165] ret_from_fork+0x1f/0x30 [ 83.932377][ T165] Modules linked in: 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 [ 84.218528][ T165] ---[ end trace 270d9d33463c3b0c ]--- [ 84.247062][ T165] RIP: 0010:__ext4_journal_get_write_access+0x6b/0x2b0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 84.253951][ T165] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 25 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 30 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f8 01 00 00 4c 8b 73 10 4d 85 f6 0f 84 f4 00 00 [ 84.286835][ T165] RSP: 0018:ffffc90000e56db8 EFLAGS: 00010202 [ 84.301344][ T165] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880a46d82b8 executing program executing program executing program [ 84.350857][ T165] RDX: 0000000000000002 RSI: ffffffff8a067e40 RDI: 0000000000000010 [ 84.378366][ T165] RBP: ffff8880a46d82b8 R08: 0000000000000001 R09: ffff8880a8fccea0 [ 84.425823][ T165] R10: fffffbfff16b2399 R11: 0000000000000000 R12: 0000000000000001 [ 84.433826][ T165] R13: 1ffff920001cadcb R14: ffff8880986e8000 R15: 0000000000000c9d executing program executing program executing program executing program executing program executing program executing program executing program [ 84.468135][ T165] FS: 0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 84.530466][ T165] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 84.565043][ T165] CR2: 00007f4b02028e78 CR3: 00000000a10c2000 CR4: 00000000001506e0 executing program executing program executing program executing program executing program executing program [ 84.598923][ T165] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 executing program executing program executing program executing program executing program [ 84.648355][ T165] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 84.676084][ T165] Kernel panic - not syncing: Fatal exception [ 84.683596][ T165] Kernel Offset: disabled [ 84.687911][ T165] Rebooting in 86400 seconds..