[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.663352] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.925672] random: sshd: uninitialized urandom read (32 bytes read) [ 25.278416] random: sshd: uninitialized urandom read (32 bytes read) [ 26.027938] random: sshd: uninitialized urandom read (32 bytes read) [ 26.190670] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 31.641449] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.783823] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 31.795066] File: /root/bus PID: 4563 Comm: syz-executor342 [ 31.809588] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 31.820674] File: /root/bus PID: 4567 Comm: syz-executor342 executing program executing program executing program executing program executing program executing program [ 31.858523] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 31.869741] File: /root/bus PID: 4565 Comm: syz-executor342 executing program executing program executing program executing program executing program executing program executing program [ 31.911237] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 31.922436] File: /root/bus PID: 4566 Comm: syz-executor342 executing program executing program executing program executing program executing program executing program [ 31.980768] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 31.991881] File: /root/bus PID: 4561 Comm: syz-executor342 [ 32.019207] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! executing program executing program [ 32.030366] File: /root/bus PID: 4569 Comm: syz-executor342 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.060966] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 32.072149] File: /root/bus PID: 4556 Comm: syz-executor342 [ 32.089381] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 32.100519] File: /root/bus PID: 4565 Comm: syz-executor342 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.149268] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 32.160407] File: /root/bus PID: 4563 Comm: syz-executor342 [ 32.170790] Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! [ 32.181904] File: /root/bus PID: 4569 Comm: syz-executor342 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.643256] WARNING: CPU: 0 PID: 4577 at fs/ext4/inode.c:3894 ext4_set_page_dirty+0x28d/0x330 [ 32.652050] Kernel panic - not syncing: panic_on_warn set ... [ 32.652050] [ 32.659406] CPU: 0 PID: 4577 Comm: syz-executor342 Not tainted 4.17.0-rc6+ #61 [ 32.666749] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.676086] Call Trace: [ 32.678667] dump_stack+0x1b9/0x294 [ 32.682279] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.687462] ? ext4_set_page_dirty+0x200/0x330 [ 32.692047] panic+0x22f/0x4de [ 32.695225] ? add_taint.cold.5+0x16/0x16 [ 32.699355] ? __warn.cold.8+0x148/0x1b3 [ 32.703400] ? __warn.cold.8+0x117/0x1b3 [ 32.707464] ? ext4_set_page_dirty+0x28d/0x330 [ 32.712039] __warn.cold.8+0x163/0x1b3 [ 32.715915] ? ext4_set_page_dirty+0x28d/0x330 [ 32.720481] report_bug+0x252/0x2d0 [ 32.724096] do_error_trap+0x1de/0x490 [ 32.727965] ? graph_lock+0x170/0x170 [ 32.731756] ? math_error+0x420/0x420 [ 32.735570] ? graph_lock+0x170/0x170 [ 32.739358] ? print_usage_bug+0xc0/0xc0 executing program [ 32.743410] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.748241] do_invalid_op+0x1b/0x20 [ 32.751939] invalid_op+0x14/0x20 [ 32.755382] RIP: 0010:ext4_set_page_dirty+0x28d/0x330 [ 32.760548] RSP: 0018:ffff8801b38fe2a0 EFLAGS: 00010293 [ 32.765896] RAX: ffff8801aca16680 RBX: 1ffff1003671fc56 RCX: ffffffff82052441 [ 32.773145] RDX: 0000000000000000 RSI: ffffffff8205248d RDI: 0000000000000007 [ 32.780414] RBP: ffff8801b38fe378 R08: ffff8801aca16680 R09: 0000000000000006 [ 32.787683] R10: ffff8801aca16680 R11: 0000000000000000 R12: ffffea0007007f40 [ 32.795034] R13: 0000000000000000 R14: ffff8801b38fe350 R15: ffffea0007007f60 [ 32.802305] ? ext4_set_page_dirty+0x241/0x330 [ 32.806873] ? ext4_set_page_dirty+0x28d/0x330 [ 32.811441] ? ext4_readpages+0x110/0x110 [ 32.815580] ? graph_lock+0x170/0x170 [ 32.819370] ? preempt_notifier_register+0x1e0/0x1e0 [ 32.824465] ? ext4_readpages+0x110/0x110 [ 32.828610] set_page_dirty+0x35f/0x6d0 [ 32.832577] ? __writepage+0xe0/0xe0 [ 32.836273] ? __lock_is_held+0xb5/0x140 [ 32.840319] ? check_same_owner+0x320/0x320 [ 32.844623] ? generic_make_request+0x420/0x1510 [ 32.849368] ? ext4_direct_IO+0xf90/0x2110 [ 32.853601] ? rcu_note_context_switch+0x710/0x710 [ 32.858516] ? __might_sleep+0x95/0x190 [ 32.862475] set_page_dirty_lock+0x115/0x180 [ 32.866870] ? wb_domain_writeout_inc.part.24+0xa0/0xa0 [ 32.872226] dio_bio_complete+0x599/0x870 [ 32.876362] ? dio_bio_end_io+0x180/0x180 [ 32.880496] ? mark_held_locks+0xc9/0x160 [ 32.884624] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.889192] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.894278] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.899283] do_blockdev_direct_IO+0x4153/0x9e90 [ 32.904028] ? __lock_acquire+0x7f5/0x5140 [ 32.908259] ? do_direct_IO+0xc300/0xc300 [ 32.912390] ? graph_lock+0x170/0x170 [ 32.916181] ? graph_lock+0x170/0x170 [ 32.919969] ? idr_preload+0x40/0x40 [ 32.923664] ? find_held_lock+0x36/0x1c0 [ 32.927709] ? find_held_lock+0x36/0x1c0 [ 32.931757] ? lock_downgrade+0x8e0/0x8e0 [ 32.935893] ? kasan_check_read+0x11/0x20 [ 32.940032] ? rcu_is_watching+0x85/0x140 [ 32.944173] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.949348] ? find_get_pages_range_tag+0x93f/0x1250 [ 32.954436] ? wait_on_page_bit+0x650/0x650 [ 32.958741] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 32.963478] ? debug_check_no_locks_freed+0x310/0x310 [ 32.968649] ? __lock_acquire+0x7f5/0x5140 [ 32.972865] ? lock_downgrade+0x8e0/0x8e0 [ 32.976998] ? graph_lock+0x170/0x170 [ 32.980786] ? debug_check_no_locks_freed+0x310/0x310 [ 32.985962] ? find_get_pages_range_tag+0x93f/0x1250 [ 32.991056] ? find_held_lock+0x36/0x1c0 [ 32.995107] ? lock_downgrade+0x8e0/0x8e0 [ 32.999241] ? kasan_check_read+0x11/0x20 [ 33.003374] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.007774] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.013303] ? wait_on_page_bit_common+0x770/0x770 [ 33.018219] ? do_writepages+0x161/0x1a0 [ 33.022284] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 33.027897] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 33.033507] __blockdev_direct_IO+0x9d/0xc6 [ 33.037823] ext4_direct_IO+0xf90/0x2110 [ 33.041871] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.047389] ? timespec_trunc+0xe7/0x170 [ 33.051454] ? put_itimerspec64+0x310/0x310 [ 33.055761] ? ext4_iomap_end+0x800/0x800 [ 33.059893] ? current_time+0x86/0xc0 [ 33.063677] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.069198] ? new_inode+0x40/0x40 [ 33.072723] ? delete_from_page_cache_batch+0xf70/0xf70 [ 33.078076] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.083600] ? touch_atime+0x101/0x310 [ 33.087473] ? __atime_needs_update+0xd10/0xd10 [ 33.092143] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.097667] ? filemap_check_errors+0xd8/0x110 [ 33.102236] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.107766] generic_file_read_iter+0x510/0x2f00 [ 33.112508] ? find_held_lock+0x36/0x1c0 [ 33.116565] ? filemap_range_has_page+0x3c0/0x3c0 [ 33.121412] ? check_same_owner+0x320/0x320 [ 33.125727] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.130121] ? rcu_note_context_switch+0x710/0x710 [ 33.135038] ? lock_acquire+0x1dc/0x520 [ 33.138999] ? __might_sleep+0x95/0x190 [ 33.142965] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.148484] ? futex_wait_queue_me+0x550/0x820 [ 33.153054] ? print_usage_bug+0xc0/0xc0 [ 33.157106] ? kasan_check_write+0x14/0x20 [ 33.161324] ? do_raw_spin_lock+0xc1/0x200 [ 33.165547] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.171066] ? get_futex_value_locked+0xcb/0xf0 [ 33.175717] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.180719] ? futex_wait_setup+0x279/0x400 [ 33.185036] ? __lock_acquire+0x7f5/0x5140 [ 33.189261] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.194432] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.199952] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 33.205045] ? debug_check_no_locks_freed+0x310/0x310 [ 33.210226] ? futex_wait_setup+0x400/0x400 [ 33.214531] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.219717] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.225237] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 33.230329] ? futex_wake+0x2f6/0x750 [ 33.234111] ? get_futex_key+0x1e90/0x1e90 [ 33.238339] ? graph_lock+0x170/0x170 [ 33.242121] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.247311] ? do_futex+0x249/0x27d0 [ 33.251009] ? kasan_check_read+0x11/0x20 [ 33.255147] ? rcu_is_watching+0x85/0x140 [ 33.259277] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.264458] ? find_held_lock+0x36/0x1c0 [ 33.268502] ? lock_downgrade+0x8e0/0x8e0 [ 33.272633] ? kasan_check_read+0x11/0x20 [ 33.276761] ? rcu_is_watching+0x85/0x140 [ 33.280898] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.286080] ? __fget+0x40c/0x650 [ 33.289526] ext4_file_read_iter+0x18b/0x3c0 [ 33.293924] __vfs_read+0x696/0xa50 [ 33.297706] ? vfs_copy_file_range+0xb80/0xb80 [ 33.302270] ? fsnotify+0xfc0/0xfc0 [ 33.305882] ? fsnotify_first_mark+0x330/0x330 [ 33.310452] ? __fget_light+0x2ef/0x430 [ 33.314410] ? fget_raw+0x20/0x20 [ 33.317849] ? rw_verify_area+0x118/0x360 [ 33.321976] vfs_read+0x17f/0x3d0 [ 33.325411] ksys_pread64+0x174/0x1a0 [ 33.329193] ? __ia32_sys_write+0xb0/0xb0 [ 33.333328] __x64_sys_pread64+0x97/0xf0 [ 33.337374] do_syscall_64+0x1b1/0x800 [ 33.341249] ? finish_task_switch+0x1ca/0x840 [ 33.345728] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.350641] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.355575] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.360926] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.365752] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.370921] RIP: 0033:0x445c09 [ 33.374087] RSP: 002b:00007f4eead2ad18 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 [ 33.381777] RAX: ffffffffffffffda RBX: 00000000006dac74 RCX: 0000000000445c09 [ 33.389037] RDX: 00000000fffffd80 RSI: 0000000020002000 RDI: 0000000000000073 [ 33.396290] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 33.403544] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac70 [ 33.410796] R13: 00007f4eead2ad20 R14: 2e64657473757274 R15: 000000000000000b [ 33.418811] Dumping ftrace buffer: [ 33.422503] (ftrace buffer empty) [ 33.426208] Kernel Offset: disabled [ 33.429821] Rebooting in 86400 seconds..