[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.155' (ECDSA) to the list of known hosts.
2020/11/17 17:59:47 fuzzer started
2020/11/17 17:59:47 dialing manager at 10.128.0.105:39141
2020/11/17 17:59:52 syscalls: 3448
2020/11/17 17:59:52 code coverage: enabled
2020/11/17 17:59:52 comparison tracing: enabled
2020/11/17 17:59:52 extra coverage: enabled
2020/11/17 17:59:52 setuid sandbox: enabled
2020/11/17 17:59:52 namespace sandbox: enabled
2020/11/17 17:59:52 Android sandbox: /sys/fs/selinux/policy does not exist
2020/11/17 17:59:52 fault injection: enabled
2020/11/17 17:59:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/11/17 17:59:52 net packet injection: enabled
2020/11/17 17:59:52 net device setup: enabled
2020/11/17 17:59:52 concurrency sanitizer: enabled
2020/11/17 17:59:52 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/11/17 17:59:52 USB emulation: enabled
2020/11/17 17:59:52 hci packet injection: enabled
2020/11/17 17:59:52 wifi device emulation: enabled
2020/11/17 17:59:58 suppressing KCSAN reports in functions: 'tick_sched_timer' 'expire_timers' '__delete_from_page_cache' 'dev_uevent' 'ext4_mb_regular_allocator' 'ext4_mark_iloc_dirty' 'do_sys_poll' 'kauditd_thread' 'ext4_writepages' 'find_get_pages_range_tag' 'xas_find_marked' 'filemap_map_pages' 'pcpu_alloc' 'ext4_mb_good_group' '__ext4_new_inode' 'generic_write_end' 'do_settimeofday64' 'do_nanosleep' '__io_cqring_fill_event' 'ext4_da_write_end' 'lru_add_drain_all' '__xa_clear_mark' 'snd_rawmidi_kernel_write1' 'blk_mq_sched_dispatch_requests' 'shmem_mknod' 'blk_mq_dispatch_rq_list' 'tick_nohz_next_event' '__ext4_update_other_inode_time' '__process_echoes' 'shmem_unlink' 'ext4_setattr' '__mod_timer' 'inotify_one_event' 'audit_log_start' 'io_sq_thread' 'device_del' 'exit_mm' 'ext4_handle_inode_extension' '__delayacct_blkio_end' 'xas_clear_mark' 'kcm_rfree' '_prb_read_valid' '__ptrace_unlink' 'ext4_free_inode' 'futex_wait_queue_me' 'wbt_issue' 'snd_rawmidi_poll' 'alloc_pid' 'blk_mq_rq_ctx_init' 'blk_mq_request_bypass_insert' 'exit_signals' 'dd_has_work' 'do_select' '__add_to_page_cache_locked' 'n_tty_receive_buf_common' 'snd_rawmidi_transmit' 'fprop_new_period' '__mark_inode_dirty' 'do_signal_stop' '__find_get_block' 'ext4_free_inodes_count' 
18:01:35 executing program 0:
bpf$MAP_CREATE(0x0, &(0x7f0000001e00)={0x11, 0x0, 0x0, 0x9}, 0x40)

syzkaller login: [  136.933106][ T8440] ==================================================================
[  136.941220][ T8440] BUG: KCSAN: data-race in atime_needs_update / propagate_one
[  136.948660][ T8440] 
[  136.950965][ T8440] read-write to 0xffff888100bcd070 of 4 bytes by task 8456 on cpu 0:
[  136.959011][ T8440]  propagate_one+0x323/0x3f0
[  136.963577][ T8440]  propagate_mnt+0x2f8/0x650
[  136.968141][ T8440]  attach_recursive_mnt+0x4fb/0x1180
[  136.973536][ T8440]  path_mount+0x1aed/0x1c10
[  136.978017][ T8440]  __se_sys_mount+0x23d/0x2e0
[  136.982667][ T8440]  __x64_sys_mount+0x63/0x70
[  136.987235][ T8440]  do_syscall_64+0x39/0x80
[  136.991627][ T8440]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  136.997508][ T8440] 
[  136.999813][ T8440] read to 0xffff888100bcd070 of 4 bytes by task 8440 on cpu 1:
[  137.007344][ T8440]  atime_needs_update+0x1b7/0x370
[  137.012341][ T8440]  touch_atime+0x55/0x2d0
[  137.016645][ T8440]  generic_file_buffered_read+0x1a1c/0x2110
[  137.022509][ T8440]  generic_file_read_iter+0x80/0x3d0
[  137.027784][ T8440]  ext4_file_read_iter+0x2d0/0x420
[  137.032869][ T8440]  __kernel_read+0x307/0x560
[  137.037432][ T8440]  integrity_kernel_read+0x4c/0x70
[  137.042523][ T8440]  ima_calc_file_hash+0x9c7/0x1430
[  137.047673][ T8440]  ima_collect_measurement+0x168/0x300
[  137.053117][ T8440]  process_measurement+0x9f1/0x1050
[  137.058294][ T8440]  ima_file_check+0x72/0xa0
[  137.062773][ T8440]  path_openat+0x1887/0x20a0
[  137.067335][ T8440]  do_filp_open+0xbd/0x1d0
[  137.071742][ T8440]  do_sys_openat2+0xa3/0x240
[  137.076307][ T8440]  __x64_sys_openat+0xef/0x110
[  137.081046][ T8440]  do_syscall_64+0x39/0x80
[  137.085440][ T8440]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  137.091300][ T8440] 
[  137.093603][ T8440] Reported by Kernel Concurrency Sanitizer on:
[  137.100017][ T8440] CPU: 1 PID: 8440 Comm: syz-fuzzer Not tainted 5.10.0-rc4-syzkaller #0
[  137.108523][ T8440] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  137.118555][ T8440] ==================================================================
[  137.126593][ T8440] Kernel panic - not syncing: panic_on_warn set ...
[  137.133154][ T8440] CPU: 1 PID: 8440 Comm: syz-fuzzer Not tainted 5.10.0-rc4-syzkaller #0
[  137.141543][ T8440] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  137.151570][ T8440] Call Trace:
[  137.154838][ T8440]  dump_stack+0x116/0x15d
[  137.159140][ T8440]  panic+0x1e7/0x5fa
[  137.163022][ T8440]  ? vprintk_emit+0x2f2/0x370
[  137.167670][ T8440]  kcsan_report+0x67b/0x680
[  137.172149][ T8440]  ? kcsan_setup_watchpoint+0x46a/0x4d0
[  137.177676][ T8440]  ? atime_needs_update+0x1b7/0x370
[  137.182863][ T8440]  ? touch_atime+0x55/0x2d0
[  137.187342][ T8440]  ? generic_file_buffered_read+0x1a1c/0x2110
[  137.193384][ T8440]  ? generic_file_read_iter+0x80/0x3d0
[  137.198817][ T8440]  ? ext4_file_read_iter+0x2d0/0x420
[  137.204088][ T8440]  ? __kernel_read+0x307/0x560
[  137.208843][ T8440]  ? integrity_kernel_read+0x4c/0x70
[  137.214099][ T8440]  ? ima_calc_file_hash+0x9c7/0x1430
[  137.219358][ T8440]  ? ima_collect_measurement+0x168/0x300
[  137.224964][ T8440]  ? process_measurement+0x9f1/0x1050
[  137.230311][ T8440]  ? ima_file_check+0x72/0xa0
[  137.234975][ T8440]  ? path_openat+0x1887/0x20a0
[  137.239726][ T8440]  ? do_filp_open+0xbd/0x1d0
[  137.244289][ T8440]  ? do_sys_openat2+0xa3/0x240
[  137.249749][ T8440]  ? __x64_sys_openat+0xef/0x110
[  137.254659][ T8440]  ? do_syscall_64+0x39/0x80
[  137.259236][ T8440]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  137.265280][ T8440]  ? page_cache_ra_unbounded+0x484/0x4c0
[  137.270885][ T8440]  kcsan_setup_watchpoint+0x46a/0x4d0
[  137.276231][ T8440]  atime_needs_update+0x1b7/0x370
[  137.281230][ T8440]  touch_atime+0x55/0x2d0
[  137.285531][ T8440]  ? mark_page_accessed+0x529/0x5e0
[  137.290718][ T8440]  generic_file_buffered_read+0x1a1c/0x2110
[  137.296585][ T8440]  generic_file_read_iter+0x80/0x3d0
[  137.301845][ T8440]  ext4_file_read_iter+0x2d0/0x420
[  137.306929][ T8440]  __kernel_read+0x307/0x560
[  137.311495][ T8440]  integrity_kernel_read+0x4c/0x70
[  137.316581][ T8440]  ima_calc_file_hash+0x9c7/0x1430
[  137.321666][ T8440]  ? __should_failslab+0x81/0x90
[  137.326597][ T8440]  ? integrity_audit_message+0x7b/0x280
[  137.332129][ T8440]  ? should_failslab+0x5/0x20
[  137.336779][ T8440]  ? slab_pre_alloc_hook+0x20/0xb0
[  137.341862][ T8440]  ? widen_string+0x3a/0x280
[  137.346425][ T8440]  ? format_decode+0x1d3/0x840
[  137.351160][ T8440]  ? string+0x1f9/0x210
[  137.355287][ T8440]  ? __rcu_read_unlock+0x3a/0x220
[  137.360288][ T8440]  ? ext4_xattr_ibody_get+0x68/0x630
[  137.365547][ T8440]  ? aa_get_newest_label+0x74/0x250
[  137.370722][ T8440]  ? apparmor_capable+0xfe/0x160
[  137.375642][ T8440]  ? __rcu_read_unlock+0x3a/0x220
[  137.380644][ T8440]  ? ext4_xattr_get+0x27d/0x580
[  137.385468][ T8440]  ? ima_match_policy+0xa54/0xa90
[  137.390466][ T8440]  ima_collect_measurement+0x168/0x300
[  137.397145][ T8440]  process_measurement+0x9f1/0x1050
[  137.402444][ T8440]  ? dquot_file_open+0x68/0x80
[  137.407183][ T8440]  ? ext4_file_open+0x186/0x4f0
[  137.412010][ T8440]  ? aa_get_newest_label+0x74/0x250
[  137.417181][ T8440]  ? __rcu_read_unlock+0x51/0x220
[  137.422197][ T8440]  ? fsnotify_perm+0x296/0x2d0
[  137.426939][ T8440]  ? aa_get_task_label+0x72/0xc0
[  137.431854][ T8440]  ? apparmor_task_getsecid+0x81/0xa0
[  137.437205][ T8440]  ima_file_check+0x72/0xa0
[  137.441686][ T8440]  path_openat+0x1887/0x20a0
[  137.446286][ T8440]  ? __ext4_mark_inode_dirty+0x46a/0x610
[  137.451908][ T8440]  do_filp_open+0xbd/0x1d0
[  137.456327][ T8440]  ? _raw_spin_unlock+0x22/0x40
[  137.461168][ T8440]  ? __alloc_fd+0x33c/0x390
[  137.465662][ T8440]  do_sys_openat2+0xa3/0x240
[  137.470246][ T8440]  ? mem_cgroup_handle_over_high+0x34/0x4d0
[  137.476114][ T8440]  __x64_sys_openat+0xef/0x110
[  137.480957][ T8440]  do_syscall_64+0x39/0x80
[  137.485368][ T8440]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  137.491499][ T8440] RIP: 0033:0x4b3d4a
[  137.495394][ T8440] Code: e8 5b a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
[  137.515075][ T8440] RSP: 002b:000000c0273a1808 EFLAGS: 00000216 ORIG_RAX: 0000000000000101
[  137.523486][ T8440] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3d4a
[  137.531434][ T8440] RDX: 0000000000080002 RSI: 000000c024f58400 RDI: ffffffffffffff9c
[  137.539380][ T8440] RBP: 000000c0273a1880 R08: 0000000000000000 R09: 0000000000000000
[  137.547326][ T8440] R10: 00000000000001a4 R11: 0000000000000216 R12: ffffffffffffffff
[  137.555272][ T8440] R13: 0000000000000021 R14: 0000000000000020 R15: 0000000000000100
[  137.564043][ T8440] Kernel Offset: disabled
[  137.568371][ T8440] Rebooting in 86400 seconds..