[ 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 '10.128.1.46' (ECDSA) to the list of known hosts. 2021/02/08 23:04:45 fuzzer started 2021/02/08 23:04:45 dialing manager at 10.128.0.163:40523 2021/02/08 23:04:46 syscalls: 3470 2021/02/08 23:04:46 code coverage: enabled 2021/02/08 23:04:46 comparison tracing: enabled 2021/02/08 23:04:46 extra coverage: enabled 2021/02/08 23:04:46 setuid sandbox: enabled 2021/02/08 23:04:46 namespace sandbox: enabled 2021/02/08 23:04:46 Android sandbox: /sys/fs/selinux/policy does not exist 2021/02/08 23:04:46 fault injection: enabled 2021/02/08 23:04:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/02/08 23:04:46 net packet injection: enabled 2021/02/08 23:04:46 net device setup: enabled 2021/02/08 23:04:46 concurrency sanitizer: enabled 2021/02/08 23:04:46 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/02/08 23:04:46 USB emulation: enabled 2021/02/08 23:04:46 hci packet injection: enabled 2021/02/08 23:04:46 wifi device emulation: enabled 2021/02/08 23:04:48 suppressing KCSAN reports in functions: 'generic_file_buffered_read' '__add_to_page_cache_locked' 'do_signal_stop' 'blk_mq_dispatch_rq_list' 'ext4_free_inodes_count' 'ext4_mark_iloc_dirty' 'n_tty_receive_buf_common' 'n_tty_receive_char_special' '__xa_clear_mark' 'pcpu_alloc' 'generic_write_end' 'step_into' 'futex_wait_queue_me' 'do_nanosleep' 'isolate_migratepages_block' 'expire_timers' 'ext4_mb_regular_allocator' 'kauditd_thread' 'ext4_write_end' 'wbt_done' 'start_this_handle' 'dput' 'ext4_mb_find_by_goal' '__ext4_new_inode' 'jbd2_journal_commit_transaction' 'blk_mq_sched_dispatch_requests' '_prb_read_valid' 'do_select' 'exit_mm' 'dd_has_work' 'jbd2_journal_dirty_metadata' 'find_get_pages_range_tag' 'ext4_writepages' 'xas_find_marked' 'ext4_mb_good_group' 'filemap_map_pages' '__jbd2_journal_file_buffer' 'blk_mq_rq_ctx_init' 'ext4_free_inode' 'do_sys_poll' '__filemap_fdatawrite_range' 2021/02/08 23:04:48 fetching corpus: 0, signal 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2021/02/08 23:05:29 starting 6 fuzzer processes 23:05:29 executing program 0: r0 = open(&(0x7f0000000080)='./file0\x00', 0x80ff, 0x0) fcntl$setlease(r0, 0x400, 0x0) r1 = open(&(0x7f00009e1000)='./file0\x00', 0x0, 0x0) fcntl$setlease(r1, 0x400, 0x1) syzkaller login: [ 73.892703][ T8411] ================================================================== [ 73.900835][ T8411] BUG: KCSAN: data-race in atime_needs_update / propagate_one [ 73.908294][ T8411] [ 73.910595][ T8411] write to 0xffff888140d66870 of 4 bytes by task 8419 on cpu 1: [ 73.918198][ T8411] propagate_one+0x32d/0x400 [ 73.922797][ T8411] propagate_mnt+0x2f8/0x640 [ 73.927384][ T8411] attach_recursive_mnt+0x4fb/0x11c0 [ 73.932645][ T8411] path_mount+0x1b71/0x1ca0 [ 73.937120][ T8411] __se_sys_mount+0x23d/0x2e0 [ 73.941828][ T8411] __x64_sys_mount+0x63/0x70 [ 73.946398][ T8411] do_syscall_64+0x39/0x80 [ 73.951011][ T8411] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.956916][ T8411] [ 73.959218][ T8411] read to 0xffff888140d66870 of 4 bytes by task 8411 on cpu 0: [ 73.966743][ T8411] atime_needs_update+0x133/0x370 [ 73.971748][ T8411] touch_atime+0x55/0x2d0 [ 73.976053][ T8411] generic_file_buffered_read+0x945/0x9c0 [ 73.981762][ T8411] generic_file_read_iter+0x82/0x3e0 [ 73.987022][ T8411] ext4_file_read_iter+0x2e0/0x430 [ 73.992114][ T8411] __kernel_read+0x306/0x580 [ 73.997120][ T8411] integrity_kernel_read+0x4c/0x70 [ 74.002209][ T8411] ima_calc_file_hash+0x929/0x1310 [ 74.007303][ T8411] ima_collect_measurement+0x168/0x310 [ 74.012749][ T8411] process_measurement+0xa4c/0x10c0 [ 74.017923][ T8411] ima_file_check+0x75/0xa0 [ 74.022402][ T8411] path_openat+0x188a/0x20a0 [ 74.026989][ T8411] do_filp_open+0xbd/0x1d0 [ 74.031392][ T8411] do_sys_openat2+0xa3/0x250 [ 74.035973][ T8411] __x64_sys_openat+0xef/0x110 [ 74.040715][ T8411] do_syscall_64+0x39/0x80 [ 74.045123][ T8411] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.051013][ T8411] [ 74.053311][ T8411] Reported by Kernel Concurrency Sanitizer on: [ 74.059427][ T8411] CPU: 0 PID: 8411 Comm: syz-fuzzer Not tainted 5.11.0-rc7-syzkaller #0 [ 74.067737][ T8411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.077772][ T8411] ================================================================== [ 74.085818][ T8411] Kernel panic - not syncing: panic_on_warn set ... [ 74.092375][ T8411] CPU: 0 PID: 8411 Comm: syz-fuzzer Not tainted 5.11.0-rc7-syzkaller #0 [ 74.100771][ T8411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.110819][ T8411] Call Trace: [ 74.114077][ T8411] dump_stack+0x116/0x15d [ 74.118408][ T8411] panic+0x1e7/0x5fa [ 74.122279][ T8411] ? vprintk_emit+0x2e2/0x360 [ 74.126958][ T8411] kcsan_report+0x67b/0x680 [ 74.131449][ T8411] ? kcsan_setup_watchpoint+0x472/0x4d0 [ 74.136970][ T8411] ? atime_needs_update+0x133/0x370 [ 74.142144][ T8411] ? touch_atime+0x55/0x2d0 [ 74.146706][ T8411] ? generic_file_buffered_read+0x945/0x9c0 [ 74.152573][ T8411] ? generic_file_read_iter+0x82/0x3e0 [ 74.158017][ T8411] ? ext4_file_read_iter+0x2e0/0x430 [ 74.163280][ T8411] ? __kernel_read+0x306/0x580 [ 74.168016][ T8411] ? integrity_kernel_read+0x4c/0x70 [ 74.173282][ T8411] ? ima_calc_file_hash+0x929/0x1310 [ 74.178541][ T8411] ? ima_collect_measurement+0x168/0x310 [ 74.184234][ T8411] ? process_measurement+0xa4c/0x10c0 [ 74.189628][ T8411] ? ima_file_check+0x75/0xa0 [ 74.194292][ T8411] ? path_openat+0x188a/0x20a0 [ 74.199046][ T8411] ? do_filp_open+0xbd/0x1d0 [ 74.203610][ T8411] ? do_sys_openat2+0xa3/0x250 [ 74.208349][ T8411] ? __x64_sys_openat+0xef/0x110 [ 74.213278][ T8411] ? do_syscall_64+0x39/0x80 [ 74.217865][ T8411] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.223913][ T8411] ? find_get_pages_contig+0x4a9/0x4e0 [ 74.229349][ T8411] ? check_stack_object+0x61/0x70 [ 74.234350][ T8411] kcsan_setup_watchpoint+0x472/0x4d0 [ 74.239698][ T8411] ? __check_object_size+0x253/0x310 [ 74.244968][ T8411] atime_needs_update+0x133/0x370 [ 74.249969][ T8411] touch_atime+0x55/0x2d0 [ 74.254274][ T8411] generic_file_buffered_read+0x945/0x9c0 [ 74.260016][ T8411] generic_file_read_iter+0x82/0x3e0 [ 74.265282][ T8411] ext4_file_read_iter+0x2e0/0x430 [ 74.270369][ T8411] __kernel_read+0x306/0x580 [ 74.274942][ T8411] integrity_kernel_read+0x4c/0x70 [ 74.280032][ T8411] ima_calc_file_hash+0x929/0x1310 [ 74.285123][ T8411] ? integrity_audit_message+0x7b/0x280 [ 74.290643][ T8411] ? widen_string+0x3a/0x280 [ 74.295211][ T8411] ? format_decode+0x1e3/0x8a0 [ 74.299948][ T8411] ? __down_read_common+0x14e/0x510 [ 74.305121][ T8411] ? ext4_xattr_ibody_get+0x68/0x630 [ 74.310381][ T8411] ? aa_get_newest_label+0x74/0x250 [ 74.315551][ T8411] ? apparmor_capable+0xfe/0x160 [ 74.320481][ T8411] ? ext4_xattr_get+0x27d/0x580 [ 74.325308][ T8411] ? ima_match_policy+0xa83/0xab0 [ 74.330307][ T8411] ima_collect_measurement+0x168/0x310 [ 74.335741][ T8411] process_measurement+0xa4c/0x10c0 [ 74.340927][ T8411] ? lockref_put_return+0xed/0x140 [ 74.346024][ T8411] ? dquot_file_open+0x68/0x80 [ 74.350762][ T8411] ? ext4_file_open+0x186/0x560 [ 74.355602][ T8411] ? __rcu_read_unlock+0x5c/0x250 [ 74.360603][ T8411] ? fsnotify_perm+0x299/0x2e0 [ 74.365353][ T8411] ? aa_get_task_label+0x72/0xc0 [ 74.370287][ T8411] ? apparmor_task_getsecid+0x81/0xa0 [ 74.375685][ T8411] ima_file_check+0x75/0xa0 [ 74.380176][ T8411] path_openat+0x188a/0x20a0 [ 74.384762][ T8411] do_filp_open+0xbd/0x1d0 [ 74.389176][ T8411] ? _raw_spin_unlock+0x22/0x40 [ 74.394004][ T8411] ? alloc_fd+0x35d/0x3b0 [ 74.398311][ T8411] do_sys_openat2+0xa3/0x250 [ 74.402894][ T8411] ? mem_cgroup_handle_over_high+0x34/0x4d0 [ 74.408765][ T8411] __x64_sys_openat+0xef/0x110 [ 74.413512][ T8411] do_syscall_64+0x39/0x80 [ 74.417914][ T8411] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.423786][ T8411] RIP: 0033:0x4af20a [ 74.427654][ T8411] 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 [ 74.447236][ T8411] RSP: 002b:000000c0005017a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 [ 74.455635][ T8411] RAX: ffffffffffffffda RBX: 000000c00001c000 RCX: 00000000004af20a [ 74.463672][ T8411] RDX: 0000000000080002 RSI: 000000c00d1a2680 RDI: ffffffffffffff9c [ 74.471618][ T8411] RBP: 000000c000501818 R08: 0000000000000000 R09: 0000000000000000 [ 74.479575][ T8411] R10: 00000000000001a4 R11: 0000000000000202 R12: ffffffffffffffff [ 74.487533][ T8411] R13: 0000000000000035 R14: 0000000000000034 R15: 0000000000000100 [ 74.495966][ T8411] Kernel Offset: disabled [ 74.500284][ T8411] Rebooting in 86400 seconds..