[ 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 '10.128.1.62' (ECDSA) to the list of known hosts. 2020/12/11 16:35:50 fuzzer started 2020/12/11 16:35:50 dialing manager at 10.128.0.105:41413 2020/12/11 16:35:50 syscalls: 3465 2020/12/11 16:35:50 code coverage: enabled 2020/12/11 16:35:50 comparison tracing: enabled 2020/12/11 16:35:50 extra coverage: enabled 2020/12/11 16:35:50 setuid sandbox: enabled 2020/12/11 16:35:50 namespace sandbox: enabled 2020/12/11 16:35:50 Android sandbox: /sys/fs/selinux/policy does not exist 2020/12/11 16:35:50 fault injection: enabled 2020/12/11 16:35:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/12/11 16:35:50 net packet injection: enabled 2020/12/11 16:35:50 net device setup: enabled 2020/12/11 16:35:50 concurrency sanitizer: enabled 2020/12/11 16:35:50 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/12/11 16:35:50 USB emulation: enabled 2020/12/11 16:35:50 hci packet injection: enabled 2020/12/11 16:35:50 wifi device emulation: enabled 2020/12/11 16:35:55 suppressing KCSAN reports in functions: 'do_signal_stop' '__blk_mq_sched_dispatch_requests' 'ext4_handle_inode_extension' '__find_get_block' 'exit_mm' 'futex_wait_queue_me' 'blk_mq_rq_ctx_init' 'n_tty_receive_char_inline' 'find_get_pages_range_tag' '__writeback_single_inode' '__ext4_update_other_inode_time' '__delete_from_page_cache' 'blk_mq_dispatch_rq_list' 'ext4_free_inode' 'tick_nohz_next_event' 'alloc_pid' 'n_tty_receive_buf_common' '__io_cqring_fill_event' 'ext4_mb_regular_allocator' 'shmem_mknod' 'kauditd_thread' 'ext4_mb_find_by_goal' 'wbt_done' '__mark_inode_dirty' 'do_nanosleep' 'dd_has_work' 'expire_timers' 'vfs_readlink' 'ext4_sync_file' 'snd_rawmidi_poll' 'audit_log_start' 'ext4_mark_iloc_dirty' 'blk_mq_sched_dispatch_requests' 'ext4_free_inodes_count' 'dput' '__ext4_new_inode' '__xa_clear_mark' 'filemap_map_pages' 'generic_write_end' 'inet_send_prepare' 'ext4_writepages' 'do_select' '__kernfs_remove' 'do_sys_poll' 'wbt_issue' 'sit_tunnel_xmit' '_prb_read_valid' 'ext4_set_iomap' 'shmem_add_to_page_cache' 'pcpu_alloc' '__filemap_fdatawrite_range' 'complete_signal' '__add_to_page_cache_locked' 'ext4_mb_good_group' 'xas_find_marked' 16:37:42 executing program 0: mkdir(&(0x7f0000000580)='./file0\x00', 0x0) mount(0x0, &(0x7f0000000040)='./file0\x00', &(0x7f0000000100)='sysfs\x00', 0x0, 0x0) chdir(&(0x7f00000003c0)='./file0\x00') symlink(&(0x7f0000000140)='..', &(0x7f00000000c0)='./file0\x00') syzkaller login: [ 142.933701][ T8465] ================================================================== [ 142.942145][ T8465] BUG: KCSAN: data-race in atime_needs_update / propagate_one [ 142.949952][ T8465] [ 142.952313][ T8465] read-write to 0xffff8881017c8b70 of 4 bytes by task 8475 on cpu 1: [ 142.960370][ T8465] propagate_one+0x323/0x3f0 [ 142.964936][ T8465] propagate_mnt+0x2f8/0x650 [ 142.969508][ T8465] attach_recursive_mnt+0x4fb/0x1180 [ 142.974788][ T8465] path_mount+0x1aed/0x1c10 [ 142.979294][ T8465] __se_sys_mount+0x23d/0x2e0 [ 142.983960][ T8465] __x64_sys_mount+0x63/0x70 [ 142.988535][ T8465] do_syscall_64+0x39/0x80 [ 142.992925][ T8465] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 142.998797][ T8465] [ 143.001106][ T8465] read to 0xffff8881017c8b70 of 4 bytes by task 8465 on cpu 0: [ 143.009695][ T8465] atime_needs_update+0x133/0x370 [ 143.014706][ T8465] touch_atime+0x55/0x2d0 [ 143.019038][ T8465] generic_file_buffered_read+0x1b30/0x23a0 [ 143.024912][ T8465] generic_file_read_iter+0x80/0x3d0 [ 143.030202][ T8465] ext4_file_read_iter+0x2d0/0x420 [ 143.035299][ T8465] __kernel_read+0x307/0x560 [ 143.039895][ T8465] integrity_kernel_read+0x4c/0x70 [ 143.045006][ T8465] ima_calc_file_hash+0x9c7/0x1430 [ 143.050098][ T8465] ima_collect_measurement+0x168/0x300 [ 143.055544][ T8465] process_measurement+0x9f1/0x1050 [ 143.060738][ T8465] ima_file_check+0x72/0xa0 [ 143.065231][ T8465] path_openat+0x1887/0x20a0 [ 143.069813][ T8465] do_filp_open+0xbd/0x1d0 [ 143.074376][ T8465] do_sys_openat2+0xa3/0x240 [ 143.079093][ T8465] __x64_sys_openat+0xef/0x110 [ 143.083853][ T8465] do_syscall_64+0x39/0x80 [ 143.088258][ T8465] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.094136][ T8465] [ 143.096476][ T8465] Reported by Kernel Concurrency Sanitizer on: [ 143.102731][ T8465] CPU: 0 PID: 8465 Comm: syz-fuzzer Not tainted 5.10.0-rc7-syzkaller #0 [ 143.111200][ T8465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 143.121332][ T8465] ================================================================== [ 143.129372][ T8465] Kernel panic - not syncing: panic_on_warn set ... [ 143.135955][ T8465] CPU: 0 PID: 8465 Comm: syz-fuzzer Not tainted 5.10.0-rc7-syzkaller #0 [ 143.144251][ T8465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 143.154320][ T8465] Call Trace: [ 143.157652][ T8465] dump_stack+0x116/0x15d [ 143.163085][ T8465] panic+0x1e7/0x5fa [ 143.166963][ T8465] ? vprintk_emit+0x2f2/0x370 [ 143.171631][ T8465] kcsan_report+0x67b/0x680 [ 143.176114][ T8465] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 143.181654][ T8465] ? atime_needs_update+0x133/0x370 [ 143.186919][ T8465] ? touch_atime+0x55/0x2d0 [ 143.191408][ T8465] ? generic_file_buffered_read+0x1b30/0x23a0 [ 143.197477][ T8465] ? generic_file_read_iter+0x80/0x3d0 [ 143.202941][ T8465] ? ext4_file_read_iter+0x2d0/0x420 [ 143.208213][ T8465] ? __kernel_read+0x307/0x560 [ 143.212964][ T8465] ? integrity_kernel_read+0x4c/0x70 [ 143.218408][ T8465] ? ima_calc_file_hash+0x9c7/0x1430 [ 143.223669][ T8465] ? ima_collect_measurement+0x168/0x300 [ 143.229275][ T8465] ? process_measurement+0x9f1/0x1050 [ 143.234804][ T8465] ? ima_file_check+0x72/0xa0 [ 143.239482][ T8465] ? path_openat+0x1887/0x20a0 [ 143.244244][ T8465] ? do_filp_open+0xbd/0x1d0 [ 143.248828][ T8465] ? do_sys_openat2+0xa3/0x240 [ 143.253583][ T8465] ? __x64_sys_openat+0xef/0x110 [ 143.258509][ T8465] ? do_syscall_64+0x39/0x80 [ 143.263095][ T8465] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.269159][ T8465] ? page_cache_ra_unbounded+0x484/0x4c0 [ 143.274781][ T8465] kcsan_setup_watchpoint+0x46a/0x4d0 [ 143.280152][ T8465] ? __check_object_size+0x253/0x310 [ 143.285423][ T8465] atime_needs_update+0x133/0x370 [ 143.290538][ T8465] touch_atime+0x55/0x2d0 [ 143.294849][ T8465] ? mark_page_accessed+0x529/0x5e0 [ 143.300169][ T8465] generic_file_buffered_read+0x1b30/0x23a0 [ 143.306052][ T8465] generic_file_read_iter+0x80/0x3d0 [ 143.311342][ T8465] ext4_file_read_iter+0x2d0/0x420 [ 143.316533][ T8465] __kernel_read+0x307/0x560 [ 143.321108][ T8465] integrity_kernel_read+0x4c/0x70 [ 143.326649][ T8465] ima_calc_file_hash+0x9c7/0x1430 [ 143.331762][ T8465] ? integrity_audit_message+0x7b/0x280 [ 143.337300][ T8465] ? widen_string+0x3a/0x280 [ 143.341879][ T8465] ? format_decode+0x1d3/0x840 [ 143.346625][ T8465] ? string+0x1f9/0x210 [ 143.350758][ T8465] ? __rcu_read_unlock+0x3a/0x220 [ 143.355771][ T8465] ? ext4_xattr_ibody_get+0x68/0x630 [ 143.361056][ T8465] ? aa_get_newest_label+0x74/0x250 [ 143.366238][ T8465] ? apparmor_capable+0xfe/0x160 [ 143.371463][ T8465] ? __rcu_read_unlock+0x3a/0x220 [ 143.376562][ T8465] ? ext4_xattr_get+0x27d/0x580 [ 143.381498][ T8465] ? ima_match_policy+0xa54/0xa90 [ 143.386503][ T8465] ima_collect_measurement+0x168/0x300 [ 143.391948][ T8465] process_measurement+0x9f1/0x1050 [ 143.397133][ T8465] ? dquot_file_open+0x68/0x80 [ 143.401892][ T8465] ? ext4_file_open+0x186/0x4f0 [ 143.406738][ T8465] ? aa_get_newest_label+0x74/0x250 [ 143.411913][ T8465] ? __rcu_read_unlock+0x51/0x220 [ 143.416917][ T8465] ? fsnotify_perm+0x296/0x2d0 [ 143.421664][ T8465] ? aa_get_task_label+0x72/0xc0 [ 143.426584][ T8465] ? apparmor_task_getsecid+0x81/0xa0 [ 143.432302][ T8465] ima_file_check+0x72/0xa0 [ 143.436783][ T8465] path_openat+0x1887/0x20a0 [ 143.441367][ T8465] ? __ext4_mark_inode_dirty+0x46a/0x610 [ 143.446994][ T8465] do_filp_open+0xbd/0x1d0 [ 143.451398][ T8465] ? _raw_spin_unlock+0x22/0x40 [ 143.456231][ T8465] ? __alloc_fd+0x33c/0x390 [ 143.460723][ T8465] do_sys_openat2+0xa3/0x240 [ 143.465294][ T8465] ? mem_cgroup_handle_over_high+0x34/0x4d0 [ 143.471260][ T8465] __x64_sys_openat+0xef/0x110 [ 143.476124][ T8465] do_syscall_64+0x39/0x80 [ 143.480521][ T8465] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.486404][ T8465] RIP: 0033:0x4b3d4a [ 143.490278][ T8465] 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 [ 143.509969][ T8465] RSP: 002b:000000c02c7c9808 EFLAGS: 00000216 ORIG_RAX: 0000000000000101 [ 143.518379][ T8465] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3d4a [ 143.526361][ T8465] RDX: 0000000000080002 RSI: 000000c028c7e520 RDI: ffffffffffffff9c [ 143.534337][ T8465] RBP: 000000c02c7c9880 R08: 0000000000000000 R09: 0000000000000000 [ 143.542308][ T8465] R10: 00000000000001a4 R11: 0000000000000216 R12: ffffffffffffffff [ 143.550279][ T8465] R13: 000000000000002a R14: 0000000000000029 R15: 0000000000000100 [ 143.558881][ T8465] Kernel Offset: disabled [ 143.564464][ T8465] Rebooting in 86400 seconds..