[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ 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... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.116' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.759702][ T27] audit: type=1400 audit(1594180441.357:8): avc: denied { execmem } for pid=6806 comm="syz-executor252" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 63.765564][ T6806] ------------[ cut here ]------------ [ 63.785974][ T6806] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 63.797387][ T6806] WARNING: CPU: 1 PID: 6806 at block/blk-core.c:852 generic_make_request_checks+0x1cb0/0x21c0 [ 63.808907][ T6806] Kernel panic - not syncing: panic_on_warn set ... [ 63.815496][ T6806] CPU: 1 PID: 6806 Comm: syz-executor252 Not tainted 5.8.0-rc3-syzkaller #0 [ 63.824145][ T6806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.834269][ T6806] Call Trace: [ 63.837540][ T6806] dump_stack+0x18f/0x20d [ 63.841852][ T6806] panic+0x2e3/0x75c [ 63.845721][ T6806] ? __warn_printk+0xf3/0xf3 [ 63.850288][ T6806] ? __warn.cold+0x5/0x45 [ 63.854600][ T6806] ? __warn+0xd6/0x1f2 [ 63.858657][ T6806] ? generic_make_request_checks+0x1cb0/0x21c0 [ 63.864783][ T6806] __warn.cold+0x20/0x45 [ 63.869003][ T6806] ? generic_make_request_checks+0x1cb0/0x21c0 [ 63.875140][ T6806] report_bug+0x1bd/0x210 [ 63.879449][ T6806] handle_bug+0x38/0x90 [ 63.883580][ T6806] ? __warn_printk+0xc6/0xf3 [ 63.888143][ T6806] exc_invalid_op+0x13/0x40 [ 63.892620][ T6806] asm_exc_invalid_op+0x12/0x20 [ 63.897448][ T6806] RIP: 0010:generic_make_request_checks+0x1cb0/0x21c0 [ 63.904183][ T6806] Code: 1a 05 00 00 44 8b ab ac 05 00 00 48 8d 74 24 70 48 89 ef e8 92 0f fe ff 48 c7 c7 20 9b 91 88 48 89 c6 44 89 ea e8 c2 ad c2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 63.923778][ T6806] RSP: 0018:ffffc90001277330 EFLAGS: 00010282 [ 63.929822][ T6806] RAX: 0000000000000000 RBX: ffff8880a0c75000 RCX: 0000000000000000 [ 63.937767][ T6806] RDX: ffff8880952264c0 RSI: ffffffff815d4f87 RDI: fffff5200024ee58 [ 63.945722][ T6806] RBP: ffff888093841900 R08: 0000000000000001 R09: ffff8880ae7318e7 [ 63.953757][ T6806] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888093841908 [ 63.961746][ T6806] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a0c70080 [ 63.969709][ T6806] ? vprintk_func+0x97/0x1a6 [ 63.974280][ T6806] ? mark_lock+0xbc/0x1710 [ 63.978678][ T6806] ? __lock_acquire+0xc1e/0x56e0 [ 63.983602][ T6806] ? blk_update_request+0x1230/0x1230 [ 63.988959][ T6806] ? __lock_acquire+0xc1e/0x56e0 [ 63.993873][ T6806] generic_make_request+0x89/0xc00 [ 63.998974][ T6806] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.004939][ T6806] ? direct_make_request+0x670/0x670 [ 64.010845][ T6806] ? lock_acquire+0x1f1/0xad0 [ 64.015536][ T6806] ? lock_acquire+0x1f1/0xad0 [ 64.020209][ T6806] ? bio_truncate+0x70/0x70 [ 64.024703][ T6806] submit_bio+0x263/0x5b0 [ 64.029010][ T6806] ? generic_make_request+0xc00/0xc00 [ 64.034368][ T6806] ? lock_is_held_type+0xb0/0xe0 [ 64.039300][ T6806] submit_bh_wbc+0x68d/0x8e0 [ 64.043877][ T6806] __block_write_full_page+0x837/0x12e0 [ 64.049409][ T6806] ? __blkdev_direct_IO_simple+0x940/0x940 [ 64.055193][ T6806] block_write_full_page+0x214/0x270 [ 64.060474][ T6806] ? __blkdev_direct_IO_simple+0x940/0x940 [ 64.066270][ T6806] __writepage+0x60/0x170 [ 64.070594][ T6806] write_cache_pages+0x736/0x11b0 [ 64.075594][ T6806] ? tag_pages_for_writeback+0x420/0x420 [ 64.081201][ T6806] ? clear_page_dirty_for_io+0x920/0x920 [ 64.086861][ T6806] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.092821][ T6806] ? find_held_lock+0x2d/0x110 [ 64.097610][ T6806] ? __lock_acquire+0x16e3/0x56e0 [ 64.102618][ T6806] ? blkdev_readahead+0x20/0x20 [ 64.107451][ T6806] generic_writepages+0xe2/0x150 [ 64.112365][ T6806] ? write_cache_pages+0x11b0/0x11b0 [ 64.117636][ T6806] ? find_held_lock+0x2d/0x110 [ 64.122389][ T6806] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 64.128345][ T6806] do_writepages+0xec/0x290 [ 64.132824][ T6806] ? writeback_set_ratelimit+0x150/0x150 [ 64.138429][ T6806] ? do_raw_spin_lock+0x120/0x2b0 [ 64.143453][ T6806] ? do_raw_spin_unlock+0x171/0x230 [ 64.148636][ T6806] ? _raw_spin_unlock+0x24/0x40 [ 64.153461][ T6806] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 64.159427][ T6806] __filemap_fdatawrite_range+0x2a1/0x380 [ 64.165129][ T6806] ? lock_is_held_type+0xb0/0xe0 [ 64.170041][ T6806] ? delete_from_page_cache_batch+0xe20/0xe20 [ 64.176084][ T6806] ? lock_downgrade+0x820/0x820 [ 64.180909][ T6806] ? blkdev_put+0x30/0x520 [ 64.185312][ T6806] filemap_write_and_wait_range+0xe1/0x1c0 [ 64.191101][ T6806] __blkdev_put+0x69a/0x890 [ 64.195590][ T6806] ? fsync_bdev+0xd0/0xd0 [ 64.199894][ T6806] ? locks_remove_file+0x319/0x580 [ 64.204978][ T6806] ? blkdev_put+0x520/0x520 [ 64.209452][ T6806] ? blkdev_put+0x85/0x520 [ 64.213840][ T6806] ? blkdev_put+0x520/0x520 [ 64.218315][ T6806] blkdev_close+0x8c/0xb0 [ 64.222617][ T6806] __fput+0x33c/0x880 [ 64.226583][ T6806] task_work_run+0xdd/0x190 [ 64.231061][ T6806] do_exit+0xb72/0x2a40 [ 64.235193][ T6806] ? blkdev_ioctl+0xc9/0x6c0 [ 64.239756][ T6806] ? mm_update_next_owner+0x7a0/0x7a0 [ 64.245193][ T6806] do_group_exit+0x125/0x310 [ 64.249770][ T6806] __x64_sys_exit_group+0x3a/0x50 [ 64.254768][ T6806] do_syscall_64+0x60/0xe0 [ 64.259162][ T6806] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.265025][ T6806] RIP: 0033:0x43ee48 [ 64.268899][ T6806] Code: Bad RIP value. [ 64.272934][ T6806] RSP: 002b:00007fff389526f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 64.281315][ T6806] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48 [ 64.289259][ T6806] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 64.297258][ T6806] RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 64.305242][ T6806] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 64.313199][ T6806] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 64.322130][ T6806] Kernel Offset: disabled [ 64.326492][ T6806] Rebooting in 86400 seconds..