[ 52.902431][ T27] audit: type=1800 audit(1580882718.278:27): pid=8045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 52.922923][ T27] audit: type=1800 audit(1580882718.278:28): pid=8045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 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. [ 53.773129][ T27] audit: type=1800 audit(1580882719.218:29): pid=8045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 53.793095][ T27] audit: type=1800 audit(1580882719.228:30): pid=8045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. 2020/02/05 06:05:27 fuzzer started 2020/02/05 06:05:30 dialing manager at 10.128.0.105:41149 2020/02/05 06:05:30 syscalls: 2904 2020/02/05 06:05:30 code coverage: enabled 2020/02/05 06:05:30 comparison tracing: enabled 2020/02/05 06:05:30 extra coverage: enabled 2020/02/05 06:05:30 setuid sandbox: enabled 2020/02/05 06:05:30 namespace sandbox: enabled 2020/02/05 06:05:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/05 06:05:30 fault injection: enabled 2020/02/05 06:05:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/05 06:05:30 net packet injection: enabled 2020/02/05 06:05:30 net device setup: enabled 2020/02/05 06:05:30 concurrency sanitizer: enabled 2020/02/05 06:05:30 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 66.620311][ T8212] KCSAN: could not find function: 'poll_schedule_timeout' [ 72.664736][ C0] ================================================================== [ 72.673019][ C0] BUG: KCSAN: data-race in __hrtimer_run_queues / hrtimer_active [ 72.680726][ C0] [ 72.683057][ C0] read to 0xffff88812c01fbd8 of 8 bytes by interrupt on cpu 1: [ 72.690606][ C0] hrtimer_active+0x84/0x1a0 [ 72.695207][ C0] task_tick_fair+0x4c/0x910 [ 72.699792][ C0] scheduler_tick+0x5f/0xf0 [ 72.704297][ C0] update_process_times+0x5a/0x80 [ 72.709323][ C0] tick_sched_handle+0x75/0x100 [ 72.714178][ C0] tick_sched_timer+0x58/0xe0 [ 72.718857][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 72.724052][ C0] hrtimer_interrupt+0x22a/0x480 [ 72.728987][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 72.734444][ C0] apic_timer_interrupt+0xf/0x20 [ 72.739379][ C0] __tsan_read1+0x30/0x100 [ 72.743895][ C0] kallsyms_expand_symbol.constprop.0+0x103/0x160 [ 72.750330][ C0] kallsyms_lookup_name+0x7f/0x120 [ 72.755449][ C0] debugfs_write+0x14b/0x2d0 [ 72.760044][ C0] full_proxy_write+0xbd/0x100 [ 72.764813][ C0] __vfs_write+0x67/0xc0 [ 72.769056][ C0] vfs_write+0x18a/0x390 [ 72.773316][ C0] ksys_write+0xd5/0x1b0 [ 72.777750][ C0] __x64_sys_write+0x4c/0x60 [ 72.782342][ C0] do_syscall_64+0xcc/0x3a0 [ 72.786845][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 72.792721][ C0] [ 72.795046][ C0] write to 0xffff88812c01fbd8 of 8 bytes by interrupt on cpu 0: [ 72.802675][ C0] __hrtimer_run_queues+0x16c/0x5f0 [ 72.807902][ C0] hrtimer_interrupt+0x22a/0x480 [ 72.812839][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 72.818311][ C0] apic_timer_interrupt+0xf/0x20 [ 72.823258][ C0] clear_page_dirty_for_io+0x1c3/0x580 [ 72.828728][ C0] mpage_submit_page+0x6d/0x1a0 [ 72.833589][ C0] mpage_map_and_submit_buffers+0x3c4/0x6c0 [ 72.839474][ C0] ext4_writepages+0x1449/0x2500 [ 72.844407][ C0] do_writepages+0x6b/0x170 [ 72.848914][ C0] __filemap_fdatawrite_range+0x1c5/0x230 [ 72.854634][ C0] filemap_flush+0x2d/0x40 [ 72.859068][ C0] collapse_file+0x259a/0x25c0 [ 72.863837][ C0] khugepaged+0x12ae/0x2680 [ 72.868341][ C0] kthread+0x1d4/0x200 [ 72.872406][ C0] ret_from_fork+0x1f/0x30 [ 72.876810][ C0] [ 72.879130][ C0] Reported by Kernel Concurrency Sanitizer on: [ 72.885284][ C0] CPU: 0 PID: 1073 Comm: khugepaged Not tainted 5.5.0-rc1-syzkaller #0 [ 72.893513][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.903567][ C0] ================================================================== [ 72.911625][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 72.918218][ C0] CPU: 0 PID: 1073 Comm: khugepaged Not tainted 5.5.0-rc1-syzkaller #0 [ 72.926448][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.936504][ C0] Call Trace: [ 72.939779][ C0] [ 72.942637][ C0] dump_stack+0x11d/0x181 [ 72.946975][ C0] panic+0x210/0x640 [ 72.950866][ C0] ? vprintk_func+0x8d/0x140 [ 72.955449][ C0] kcsan_report.cold+0xc/0xd [ 72.960037][ C0] kcsan_setup_watchpoint+0x3fe/0x460 [ 72.965410][ C0] __tsan_unaligned_write8+0xc7/0x110 [ 72.970779][ C0] __hrtimer_run_queues+0x16c/0x5f0 [ 72.975976][ C0] ? tick_sched_handle+0x100/0x100 [ 72.981089][ C0] hrtimer_interrupt+0x22a/0x480 [ 72.986023][ C0] ? sched_clock+0x13/0x20 [ 72.990437][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 72.996407][ C0] apic_timer_interrupt+0xf/0x20 [ 73.001324][ C0] [ 73.004259][ C0] RIP: 0010:clear_page_dirty_for_io+0x1c3/0x580 [ 73.010501][ C0] Code: 48 33 0c 25 28 00 00 00 0f 85 d2 03 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a5 bb ec ff 48 89 df e8 5d 65 fa ff <4c> 89 e7 4c 8b 33 e8 62 de 09 00 31 ff 89 c3 89 c6 e8 07 bd ec ff [ 73.030107][ C0] RSP: 0018:ffffc90001cff818 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 73.038516][ C0] RAX: 00000000000000b2 RBX: ffff888128d41518 RCX: ffffffff862524e0 [ 73.046481][ C0] RDX: 0000000000000000 RSI: ffffffff81584aab RDI: ffff888128d41518 [ 73.054452][ C0] RBP: ffffc90001cff870 R08: 0000000000000000 R09: 0000888128d41518 [ 73.062423][ C0] R10: 000088812974dc58 R11: 0000888128d4151f R12: ffffea0004891640 [ 73.070388][ C0] R13: ffffea0004891648 R14: 0000000000000001 R15: ffff888129104800 [ 73.078369][ C0] ? clear_page_dirty_for_io+0x1bb/0x580 [ 73.083996][ C0] ? clear_page_dirty_for_io+0x1c3/0x580 [ 73.089631][ C0] mpage_submit_page+0x6d/0x1a0 [ 73.094491][ C0] mpage_map_and_submit_buffers+0x3c4/0x6c0 [ 73.100393][ C0] ? audit_tag_tree+0x96f/0xca0 [ 73.105247][ C0] ext4_writepages+0x1449/0x2500 [ 73.110193][ C0] ? startup_64+0x1/0x30 [ 73.114440][ C0] ? ext4_mark_inode_dirty+0x420/0x420 [ 73.119898][ C0] do_writepages+0x6b/0x170 [ 73.124396][ C0] ? do_writepages+0x6b/0x170 [ 73.129068][ C0] ? wbc_attach_and_unlock_inode+0xdd/0x3b0 [ 73.134960][ C0] ? __read_once_size.constprop.0+0x12/0x20 [ 73.140846][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.147087][ C0] __filemap_fdatawrite_range+0x1c5/0x230 [ 73.152827][ C0] filemap_flush+0x2d/0x40 [ 73.157269][ C0] collapse_file+0x259a/0x25c0 [ 73.162063][ C0] ? delay_tsc+0x8f/0xc0 [ 73.166323][ C0] khugepaged+0x12ae/0x2680 [ 73.170832][ C0] ? __rcu_read_unlock+0x66/0x3d0 [ 73.175853][ C0] ? find_next_bit+0xcb/0xe0 [ 73.180445][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.186698][ C0] kthread+0x1d4/0x200 [ 73.190778][ C0] ? collapse_pte_mapped_thp+0x7e0/0x7e0 [ 73.196417][ C0] ? kthread_unpark+0xe0/0xe0 [ 73.201097][ C0] ret_from_fork+0x1f/0x30 [ 73.484206][ C0] Kernel Offset: disabled [ 73.488708][ C0] Rebooting in 86400 seconds..