[ 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 '10.128.0.216' (ECDSA) to the list of known hosts. 2021/02/23 21:48:29 fuzzer started 2021/02/23 21:48:29 dialing manager at 10.128.0.163:35359 2021/02/23 21:48:29 syscalls: 3541 2021/02/23 21:48:29 code coverage: enabled 2021/02/23 21:48:29 comparison tracing: enabled 2021/02/23 21:48:29 extra coverage: enabled 2021/02/23 21:48:29 setuid sandbox: enabled 2021/02/23 21:48:29 namespace sandbox: enabled 2021/02/23 21:48:29 Android sandbox: /sys/fs/selinux/policy does not exist 2021/02/23 21:48:29 fault injection: enabled 2021/02/23 21:48:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/02/23 21:48:29 net packet injection: enabled 2021/02/23 21:48:29 net device setup: enabled 2021/02/23 21:48:29 concurrency sanitizer: enabled 2021/02/23 21:48:29 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/02/23 21:48:29 USB emulation: enabled 2021/02/23 21:48:29 hci packet injection: enabled 2021/02/23 21:48:29 wifi device emulation: enabled 2021/02/23 21:48:29 802.15.4 emulation: enabled 2021/02/23 21:48:32 suppressing KCSAN reports in functions: '__mark_inode_dirty' 'do_nanosleep' 'start_this_handle' 'n_tty_receive_buf_common' '__send_signal' 'blk_mq_dispatch_rq_list' 'xas_clear_mark' 'isolate_migratepages_block' 'mm_update_next_owner' '__delete_from_page_cache' 'tick_sched_timer' 'expire_timers' 'ext4_writepages' 'wbt_done' 'prandom_seed' 'ext4_mb_good_group' 'ext4_free_inode' 'generic_write_end' 'shmem_mknod' 'do_signal_stop' 'complete_signal' 'ext4_mb_find_by_goal' 'jbd2_journal_commit_transaction' '__xa_clear_mark' 'do_sys_poll' 'pcpu_alloc' 'ext4_free_inodes_count' 'blk_mq_rq_ctx_init' 'futex_wait_queue_me' 'wbt_issue' 'find_get_pages_range_tag' 'do_select' 'blk_mq_sched_dispatch_requests' 'alloc_pid' 'jbd2_journal_dirty_metadata' 'ext4_mark_iloc_dirty' '__ext4_new_inode' 'xas_find_marked' 2021/02/23 21:48:32 fetching corpus: 0, signal 0/2000 (executing program) 2021/02/23 21:48:32 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fetching corpus: 23098, signal 338100/344847 (executing program) 2021/02/23 21:48:59 fetching corpus: 23148, signal 338296/344849 (executing program) 2021/02/23 21:48:59 fetching corpus: 23198, signal 338607/344849 (executing program) 2021/02/23 21:48:59 fetching corpus: 23248, signal 338813/344849 (executing program) 2021/02/23 21:48:59 fetching corpus: 23298, signal 339026/344849 (executing program) 2021/02/23 21:48:59 fetching corpus: 23335, signal 339260/344851 (executing program) 2021/02/23 21:48:59 fetching corpus: 23335, signal 339260/344851 (executing program) 2021/02/23 21:49:01 starting 6 fuzzer processes 21:49:01 executing program 0: r0 = semget$private(0x0, 0x4000000009, 0x0) semctl$SEM_STAT(r0, 0x0, 0x12, &(0x7f00000001c0)=""/86) syzkaller login: [ 62.338642][ T8337] ================================================================== [ 62.349452][ T8337] BUG: KCSAN: data-race in atime_needs_update / propagate_mnt [ 62.356910][ T8337] [ 62.359502][ T8337] write to 0xffff88810110fc30 of 4 bytes by task 8361 on cpu 1: [ 62.367841][ T8337] propagate_mnt+0x5e8/0x640 [ 62.374379][ T8337] attach_recursive_mnt+0x4fb/0x11c0 [ 62.379964][ T8337] path_mount+0x1b71/0x1ca0 [ 62.385120][ T8337] __se_sys_mount+0x23d/0x2e0 [ 62.392691][ T8337] __x64_sys_mount+0x63/0x70 [ 62.399401][ T8337] do_syscall_64+0x39/0x80 [ 62.403822][ T8337] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 62.409700][ T8337] [ 62.412022][ T8337] read to 0xffff88810110fc30 of 4 bytes by task 8337 on cpu 0: [ 62.419670][ T8337] atime_needs_update+0x133/0x370 [ 62.424698][ T8337] touch_atime+0x55/0x2d0 [ 62.429013][ T8337] generic_file_buffered_read+0x945/0x9c0 [ 62.435583][ T8337] generic_file_read_iter+0x82/0x3e0 [ 62.446170][ T8337] ext4_file_read_iter+0x2e0/0x420 [ 62.451568][ T8337] __kernel_read+0x306/0x580 [ 62.456168][ T8337] integrity_kernel_read+0x4c/0x70 [ 62.461404][ T8337] ima_calc_file_hash+0x929/0x1310 [ 62.466507][ T8337] ima_collect_measurement+0x168/0x310 [ 62.471963][ T8337] process_measurement+0xa4c/0x10c0 [ 62.477171][ T8337] ima_file_check+0x75/0xa0 [ 62.482990][ T8337] path_openat+0x1851/0x2050 [ 62.487746][ T8337] do_filp_open+0xbd/0x1d0 [ 62.492156][ T8337] do_sys_openat2+0xa3/0x250 [ 62.496736][ T8337] __x64_sys_openat+0xef/0x110 [ 62.501531][ T8337] do_syscall_64+0x39/0x80 [ 62.505946][ T8337] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 62.511828][ T8337] [ 62.514142][ T8337] Reported by Kernel Concurrency Sanitizer on: [ 62.521269][ T8337] CPU: 0 PID: 8337 Comm: syz-fuzzer Not tainted 5.11.0-syzkaller #0 [ 62.530033][ T8337] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.540090][ T8337] ================================================================== [ 62.548237][ T8337] Kernel panic - not syncing: panic_on_warn set ... [ 62.554798][ T8337] CPU: 0 PID: 8337 Comm: syz-fuzzer Not tainted 5.11.0-syzkaller #0 [ 62.563271][ T8337] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.573320][ T8337] Call Trace: [ 62.576586][ T8337] dump_stack+0x137/0x19d [ 62.580914][ T8337] panic+0x1e7/0x5fa [ 62.584787][ T8337] ? vprintk_emit+0x2fa/0x3e0 [ 62.589454][ T8337] kcsan_report+0x67b/0x680 [ 62.594023][ T8337] ? kcsan_setup_watchpoint+0x40b/0x470 [ 62.599544][ T8337] ? atime_needs_update+0x133/0x370 [ 62.604732][ T8337] ? touch_atime+0x55/0x2d0 [ 62.609215][ T8337] ? generic_file_buffered_read+0x945/0x9c0 [ 62.615087][ T8337] ? generic_file_read_iter+0x82/0x3e0 [ 62.620537][ T8337] ? ext4_file_read_iter+0x2e0/0x420 [ 62.625909][ T8337] ? __kernel_read+0x306/0x580 [ 62.631090][ T8337] ? integrity_kernel_read+0x4c/0x70 [ 62.636354][ T8337] ? ima_calc_file_hash+0x929/0x1310 [ 62.641749][ T8337] ? ima_collect_measurement+0x168/0x310 [ 62.647368][ T8337] ? process_measurement+0xa4c/0x10c0 [ 62.652720][ T8337] ? ima_file_check+0x75/0xa0 [ 62.657385][ T8337] ? path_openat+0x1851/0x2050 [ 62.662132][ T8337] ? do_filp_open+0xbd/0x1d0 [ 62.667002][ T8337] ? do_sys_openat2+0xa3/0x250 [ 62.671931][ T8337] ? __x64_sys_openat+0xef/0x110 [ 62.676852][ T8337] ? do_syscall_64+0x39/0x80 [ 62.681441][ T8337] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 62.687621][ T8337] ? find_get_pages_contig+0x4a9/0x4e0 [ 62.693075][ T8337] ? __virt_addr_valid+0x15a/0x1a0 [ 62.698190][ T8337] kcsan_setup_watchpoint+0x40b/0x470 [ 62.703545][ T8337] ? __check_object_size+0x253/0x310 [ 62.708905][ T8337] atime_needs_update+0x133/0x370 [ 62.714275][ T8337] touch_atime+0x55/0x2d0 [ 62.718585][ T8337] generic_file_buffered_read+0x945/0x9c0 [ 62.724304][ T8337] generic_file_read_iter+0x82/0x3e0 [ 62.729586][ T8337] ext4_file_read_iter+0x2e0/0x420 [ 62.734689][ T8337] __kernel_read+0x306/0x580 [ 62.743912][ T8337] integrity_kernel_read+0x4c/0x70 [ 62.749619][ T8337] ima_calc_file_hash+0x929/0x1310 [ 62.758363][ T8337] ? ima_write_template_field_data+0x41/0x120 [ 62.764517][ T8337] ? integrity_audit_message+0x7b/0x280 [ 62.770571][ T8337] ? widen_string+0x3a/0x280 [ 62.775168][ T8337] ? format_decode+0x1e3/0x8a0 [ 62.780536][ T8337] ? __down_read_common+0x14e/0x510 [ 62.785740][ T8337] ? __rcu_read_unlock+0x45/0x250 [ 62.791339][ T8337] ? ext4_xattr_ibody_get+0x68/0x630 [ 62.796697][ T8337] ? aa_get_newest_label+0x74/0x250 [ 62.804979][ T8337] ? ext4_xattr_get+0x27d/0x580 [ 62.814369][ T8337] ? ima_match_policy+0xb1a/0xb50 [ 62.820770][ T8337] ima_collect_measurement+0x168/0x310 [ 62.829265][ T8337] process_measurement+0xa4c/0x10c0 [ 62.835137][ T8337] ? dquot_file_open+0x68/0x80 [ 62.840335][ T8337] ? ext4_file_open+0x186/0x570 [ 62.845860][ T8337] ? aa_get_newest_label+0x74/0x250 [ 62.851148][ T8337] ? fsnotify_perm+0x299/0x2e0 [ 62.855893][ T8337] ? __rcu_read_unlock+0x5c/0x250 [ 62.860910][ T8337] ? aa_get_task_label+0x72/0xc0 [ 62.865829][ T8337] ? apparmor_task_getsecid+0x81/0xa0 [ 62.871205][ T8337] ima_file_check+0x75/0xa0 [ 62.875774][ T8337] path_openat+0x1851/0x2050 [ 62.880465][ T8337] do_filp_open+0xbd/0x1d0 [ 62.884872][ T8337] ? _raw_spin_unlock+0x22/0x40 [ 62.889702][ T8337] ? alloc_fd+0x35d/0x3b0 [ 62.894024][ T8337] do_sys_openat2+0xa3/0x250 [ 62.898593][ T8337] ? mem_cgroup_handle_over_high+0x34/0x4d0 [ 62.904479][ T8337] __x64_sys_openat+0xef/0x110 [ 62.909220][ T8337] do_syscall_64+0x39/0x80 [ 62.913627][ T8337] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 62.919499][ T8337] RIP: 0033:0x4af20a [ 62.923372][ T8337] Code: e8 3b 82 fb 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 [ 62.945072][ T8337] RSP: 002b:000000c0002ed7a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 [ 62.954433][ T8337] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af20a [ 62.964118][ T8337] RDX: 0000000000080002 RSI: 000000c00b7a8500 RDI: ffffffffffffff9c [ 62.972500][ T8337] RBP: 000000c0002ed818 R08: 0000000000000000 R09: 0000000000000000 [ 62.981682][ T8337] R10: 00000000000001a4 R11: 0000000000000202 R12: ffffffffffffffff [ 62.989626][ T8337] R13: 0000000000000029 R14: 0000000000000028 R15: 0000000000000100 [ 62.998316][ T8337] Kernel Offset: disabled [ 63.002625][ T8337] Rebooting in 86400 seconds..