[ 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 '10.128.0.49' (ECDSA) to the list of known hosts. 2020/12/26 05:32:44 fuzzer started 2020/12/26 05:32:45 dialing manager at 10.128.0.105:33797 2020/12/26 05:32:45 syscalls: 3466 2020/12/26 05:32:45 code coverage: enabled 2020/12/26 05:32:45 comparison tracing: enabled 2020/12/26 05:32:45 extra coverage: enabled 2020/12/26 05:32:45 setuid sandbox: enabled 2020/12/26 05:32:45 namespace sandbox: enabled 2020/12/26 05:32:45 Android sandbox: /sys/fs/selinux/policy does not exist 2020/12/26 05:32:45 fault injection: enabled 2020/12/26 05:32:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/12/26 05:32:45 net packet injection: enabled 2020/12/26 05:32:45 net device setup: enabled 2020/12/26 05:32:45 concurrency sanitizer: enabled 2020/12/26 05:32:45 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/12/26 05:32:45 USB emulation: enabled 2020/12/26 05:32:45 hci packet injection: enabled 2020/12/26 05:32:45 wifi device emulation: enabled 2020/12/26 05:32:49 suppressing KCSAN reports in functions: 'generic_write_end' 'tick_sched_timer' 'packet_sendmsg' 'vfs_readlink' 'dd_has_work' 'ext4_handle_inode_extension' 'shmem_add_to_page_cache' 'n_tty_receive_char_inline' 'ext4_writepages' '__send_signal' '__ext4_update_other_inode_time' 'alloc_pid' 'do_nanosleep' 'do_select' 'n_tty_receive_buf_common' 'file_remove_privs' 'lru_add_drain_all' 'do_sys_poll' 'expire_timers' 'futex_wait_queue_me' 'ext4_mb_good_group' '__writeback_single_inode' '__add_to_page_cache_locked' '__filemap_fdatawrite_range' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'wbt_issue' 'xas_find_marked' 'do_signal_stop' 'blk_mq_rq_ctx_init' 'pcpu_alloc' 'kcm_rfree' '__delete_from_page_cache' 'bpf_lru_pop_free' 'dput' '_prb_read_valid' '__io_cqring_fill_event' '__mark_inode_dirty' 'exit_signals' 'find_get_pages_range_tag' 'blk_mq_sched_dispatch_requests' 'exit_mm' 'generic_file_buffered_read' 'ext4_mb_regular_allocator' 'isolate_migratepages_block' '__ext4_new_inode' '__xa_clear_mark' 'kauditd_thread' 'xas_clear_mark' '__blk_mq_sched_dispatch_requests' 'tick_nohz_next_event' 'step_into' 'ext4_mark_iloc_dirty' '__find_get_block' 'ext4_free_inode' 'audit_log_start' 05:34:34 executing program 0: openat$vsock(0xffffffffffffff9c, &(0x7f0000000340)='/dev/vsock\x00', 0x0, 0x0) syzkaller login: [ 137.675945][ T8436] ================================================================== [ 137.684046][ T8436] BUG: KCSAN: data-race in atime_needs_update / propagate_one [ 137.691493][ T8436] [ 137.693806][ T8436] read-write to 0xffff888100d3a230 of 4 bytes by task 8458 on cpu 1: [ 137.701844][ T8436] propagate_one+0x323/0x3f0 [ 137.706410][ T8436] propagate_mnt+0x2f8/0x650 [ 137.710977][ T8436] attach_recursive_mnt+0x4fb/0x1180 [ 137.716236][ T8436] path_mount+0x1aed/0x1c10 [ 137.720716][ T8436] __se_sys_mount+0x23d/0x2e0 [ 137.725392][ T8436] __x64_sys_mount+0x63/0x70 [ 137.729970][ T8436] do_syscall_64+0x39/0x80 [ 137.734375][ T8436] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 137.740256][ T8436] [ 137.742555][ T8436] read to 0xffff888100d3a230 of 4 bytes by task 8436 on cpu 0: [ 137.750068][ T8436] atime_needs_update+0x133/0x370 [ 137.755067][ T8436] touch_atime+0x55/0x2d0 [ 137.759368][ T8436] generic_file_buffered_read+0x92b/0x9a0 [ 137.765061][ T8436] generic_file_read_iter+0x80/0x3d0 [ 137.770316][ T8436] ext4_file_read_iter+0x2d0/0x420 [ 137.775415][ T8436] __kernel_read+0x307/0x560 [ 137.779979][ T8436] integrity_kernel_read+0x4c/0x70 [ 137.785077][ T8436] ima_calc_file_hash+0x956/0x1390 [ 137.790161][ T8436] ima_collect_measurement+0x168/0x300 [ 137.795602][ T8436] process_measurement+0x9f1/0x1050 [ 137.800807][ T8436] ima_file_check+0x72/0xa0 [ 137.805287][ T8436] path_openat+0x1887/0x20a0 [ 137.809866][ T8436] do_filp_open+0xbd/0x1d0 [ 137.814269][ T8436] do_sys_openat2+0xa3/0x240 [ 137.818835][ T8436] __x64_sys_openat+0xef/0x110 [ 137.823586][ T8436] do_syscall_64+0x39/0x80 [ 137.828002][ T8436] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 137.833887][ T8436] [ 137.836200][ T8436] Reported by Kernel Concurrency Sanitizer on: [ 137.842319][ T8436] CPU: 0 PID: 8436 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 137.850272][ T8436] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 137.860300][ T8436] ================================================================== [ 137.868330][ T8436] Kernel panic - not syncing: panic_on_warn set ... [ 137.874898][ T8436] CPU: 0 PID: 8436 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 137.882857][ T8436] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 137.892890][ T8436] Call Trace: [ 137.896147][ T8436] dump_stack+0x116/0x15d [ 137.900468][ T8436] panic+0x1e7/0x5fa [ 137.904350][ T8436] ? vprintk_emit+0x2e2/0x360 [ 137.909001][ T8436] kcsan_report+0x67b/0x680 [ 137.913485][ T8436] ? kcsan_setup_watchpoint+0x47b/0x4e0 [ 137.919024][ T8436] ? atime_needs_update+0x133/0x370 [ 137.924195][ T8436] ? touch_atime+0x55/0x2d0 [ 137.928688][ T8436] ? generic_file_buffered_read+0x92b/0x9a0 [ 137.934572][ T8436] ? generic_file_read_iter+0x80/0x3d0 [ 137.940008][ T8436] ? ext4_file_read_iter+0x2d0/0x420 [ 137.945268][ T8436] ? __kernel_read+0x307/0x560 [ 137.950015][ T8436] ? integrity_kernel_read+0x4c/0x70 [ 137.955275][ T8436] ? ima_calc_file_hash+0x956/0x1390 [ 137.960547][ T8436] ? ima_collect_measurement+0x168/0x300 [ 137.966153][ T8436] ? process_measurement+0x9f1/0x1050 [ 137.971498][ T8436] ? ima_file_check+0x72/0xa0 [ 137.976160][ T8436] ? path_openat+0x1887/0x20a0 [ 137.980907][ T8436] ? do_filp_open+0xbd/0x1d0 [ 137.985467][ T8436] ? do_sys_openat2+0xa3/0x240 [ 137.990203][ T8436] ? __x64_sys_openat+0xef/0x110 [ 137.995116][ T8436] ? do_syscall_64+0x39/0x80 [ 137.999684][ T8436] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 138.005737][ T8436] kcsan_setup_watchpoint+0x47b/0x4e0 [ 138.011087][ T8436] ? __check_object_size+0x253/0x310 [ 138.016363][ T8436] atime_needs_update+0x133/0x370 [ 138.021387][ T8436] touch_atime+0x55/0x2d0 [ 138.025711][ T8436] generic_file_buffered_read+0x92b/0x9a0 [ 138.031409][ T8436] generic_file_read_iter+0x80/0x3d0 [ 138.036688][ T8436] ext4_file_read_iter+0x2d0/0x420 [ 138.041791][ T8436] __kernel_read+0x307/0x560 [ 138.046359][ T8436] integrity_kernel_read+0x4c/0x70 [ 138.051470][ T8436] ima_calc_file_hash+0x956/0x1390 [ 138.056561][ T8436] ? integrity_audit_message+0x7b/0x280 [ 138.062080][ T8436] ? widen_string+0x3a/0x280 [ 138.066645][ T8436] ? format_decode+0x1d3/0x840 [ 138.071385][ T8436] ? string+0x1f9/0x210 [ 138.075514][ T8436] ? __down_read_common+0x14e/0x510 [ 138.080685][ T8436] ? ext4_xattr_ibody_get+0x68/0x630 [ 138.085966][ T8436] ? prandom_u32_state+0x9/0x80 [ 138.090791][ T8436] ? aa_get_newest_label+0x74/0x250 [ 138.095967][ T8436] ? apparmor_capable+0xfe/0x160 [ 138.100887][ T8436] ? ext4_xattr_get+0x27d/0x580 [ 138.105721][ T8436] ? ima_match_policy+0xa80/0xab0 [ 138.110719][ T8436] ima_collect_measurement+0x168/0x300 [ 138.116169][ T8436] process_measurement+0x9f1/0x1050 [ 138.121344][ T8436] ? dquot_file_open+0x68/0x80 [ 138.126084][ T8436] ? ext4_file_open+0x186/0x4f0 [ 138.130909][ T8436] ? aa_get_newest_label+0x74/0x250 [ 138.136083][ T8436] ? __rcu_read_unlock+0x51/0x250 [ 138.141098][ T8436] ? fsnotify_perm+0x296/0x2d0 [ 138.145850][ T8436] ? aa_get_task_label+0x72/0xc0 [ 138.150771][ T8436] ? apparmor_task_getsecid+0x81/0xa0 [ 138.156120][ T8436] ima_file_check+0x72/0xa0 [ 138.160599][ T8436] path_openat+0x1887/0x20a0 [ 138.165174][ T8436] ? up_write+0x25/0xc0 [ 138.169306][ T8436] do_filp_open+0xbd/0x1d0 [ 138.173709][ T8436] ? _raw_spin_unlock+0x22/0x40 [ 138.178545][ T8436] ? alloc_fd+0x35d/0x3b0 [ 138.182849][ T8436] do_sys_openat2+0xa3/0x240 [ 138.187429][ T8436] ? mem_cgroup_handle_over_high+0x34/0x4d0 [ 138.193310][ T8436] __x64_sys_openat+0xef/0x110 [ 138.198050][ T8436] do_syscall_64+0x39/0x80 [ 138.202441][ T8436] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 138.208337][ T8436] RIP: 0033:0x4b113a [ 138.212210][ T8436] Code: e8 1b c2 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 [ 138.231789][ T8436] RSP: 002b:000000c025957800 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 [ 138.240173][ T8436] RAX: ffffffffffffffda RBX: 000000c00001e000 RCX: 00000000004b113a [ 138.248119][ T8436] RDX: 0000000000080002 RSI: 000000c02cf60460 RDI: ffffffffffffff9c [ 138.256065][ T8436] RBP: 000000c025957878 R08: 0000000000000000 R09: 0000000000000000 [ 138.264011][ T8436] R10: 00000000000001a4 R11: 0000000000000202 R12: ffffffffffffffff [ 138.271956][ T8436] R13: 0000000000000024 R14: 0000000000000023 R15: 0000000000000100 [ 138.281135][ T8436] Kernel Offset: disabled [ 138.285438][ T8436] Rebooting in 86400 seconds..