[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.210' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 58.568049][ T12] ------------[ cut here ]------------ [ 58.573856][ T12] WARNING: CPU: 0 PID: 12 at fs/read_write.c:528 __kernel_write+0x828/0x9b0 [ 58.583727][ T12] Kernel panic - not syncing: panic_on_warn set ... [ 58.590337][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc4-next-20200708-syzkaller #0 [ 58.599679][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.609720][ T12] Workqueue: events p9_write_work [ 58.614716][ T12] Call Trace: [ 58.617983][ T12] dump_stack+0x18f/0x20d [ 58.622293][ T12] panic+0x2e3/0x75c [ 58.626181][ T12] ? __warn_printk+0xf3/0xf3 [ 58.631505][ T12] ? printk+0xba/0xed [ 58.635474][ T12] ? log_store.cold+0x16/0x16 [ 58.640144][ T12] ? __warn.cold+0x5/0x45 [ 58.644461][ T12] ? __warn+0xd6/0x1f2 [ 58.648504][ T12] ? __kernel_write+0x828/0x9b0 [ 58.653335][ T12] __warn.cold+0x20/0x45 [ 58.657572][ T12] ? __kernel_write+0x828/0x9b0 [ 58.662410][ T12] report_bug+0x1bd/0x210 [ 58.666729][ T12] handle_bug+0x38/0x90 [ 58.670870][ T12] exc_invalid_op+0x13/0x40 [ 58.675365][ T12] asm_exc_invalid_op+0x12/0x20 [ 58.680208][ T12] RIP: 0010:__kernel_write+0x828/0x9b0 [ 58.685660][ T12] Code: 01 89 c6 89 04 24 e8 d7 90 b5 ff 8b 04 24 85 c0 0f 84 c7 fa ff ff e9 b9 fa ff ff e8 42 94 b5 ff e9 e9 fe ff ff e8 38 94 b5 ff <0f> 0b 49 c7 c5 f7 ff ff ff e9 0e ff ff ff 4c 89 f7 e8 d2 48 f5 ff [ 58.706221][ T12] RSP: 0018:ffffc90000d2fb18 EFLAGS: 00010293 [ 58.712289][ T12] RAX: 0000000000000000 RBX: 1ffff920001a5f67 RCX: ffffffff81be629e [ 58.720267][ T12] RDX: ffff8880a95f4300 RSI: ffffffff81be69f8 RDI: 0000000000000005 [ 58.728241][ T12] RBP: ffff888094301158 R08: 0000000000000001 R09: ffff8880a95f4bd0 [ 58.736212][ T12] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888094301040 [ 58.744179][ T12] R13: 0000000000000000 R14: ffff8880943010c4 R15: 0000000000080001 [ 58.752172][ T12] ? __kernel_write+0xce/0x9b0 [ 58.756936][ T12] ? __kernel_write+0x828/0x9b0 [ 58.761792][ T12] ? __kernel_write+0x828/0x9b0 [ 58.766658][ T12] ? vfs_read+0x520/0x520 [ 58.770989][ T12] ? apparmor_file_permission+0x26e/0x4e0 [ 58.776699][ T12] ? security_file_permission+0x239/0x470 [ 58.782395][ T12] ? lock_downgrade+0x820/0x820 [ 58.787248][ T12] kernel_write+0xe2/0x200 [ 58.791644][ T12] p9_write_work+0x25e/0xca0 [ 58.796215][ T12] process_one_work+0x94c/0x1670 [ 58.810278][ T12] ? lock_release+0x8d0/0x8d0 [ 58.814931][ T12] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 58.820290][ T12] ? rwlock_bug.part.0+0x90/0x90 [ 58.825215][ T12] ? lockdep_hardirqs_off+0x66/0xa0 [ 58.830408][ T12] worker_thread+0x64c/0x1120 [ 58.835074][ T12] ? __kthread_parkme+0x13f/0x1e0 [ 58.840081][ T12] ? process_one_work+0x1670/0x1670 [ 58.845260][ T12] kthread+0x3b5/0x4a0 [ 58.849325][ T12] ? __kthread_bind_mask+0xc0/0xc0 [ 58.854421][ T12] ? __kthread_bind_mask+0xc0/0xc0 [ 58.859533][ T12] ret_from_fork+0x1f/0x30 [ 58.865129][ T12] Kernel Offset: disabled [ 58.869506][ T12] Rebooting in 86400 seconds..