[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 71.290100][ T27] audit: type=1400 audit(1598143673.066:8): avc: denied { execmem } for pid=6838 comm="syz-executor590" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 71.300473][ T6840] ------------[ cut here ]------------ [ 71.318493][ T6840] Trying to write to read-only block-device nullb0 (partno 0) [ 71.326583][ T6840] WARNING: CPU: 0 PID: 6840 at block/blk-core.c:857 submit_bio_checks+0x1aba/0x1f70 [ 71.336312][ T6840] Kernel panic - not syncing: panic_on_warn set ... [ 71.342908][ T6840] CPU: 0 PID: 6840 Comm: syz-executor590 Not tainted 5.9.0-rc1-syzkaller #0 [ 71.351593][ T6840] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.361635][ T6840] Call Trace: [ 71.364916][ T6840] dump_stack+0x18f/0x20d [ 71.369235][ T6840] panic+0x2e3/0x75c [ 71.373154][ T6840] ? __warn_printk+0xf3/0xf3 [ 71.377736][ T6840] ? __warn.cold+0x5/0x4a [ 71.382049][ T6840] ? __warn+0xd6/0x1f2 [ 71.386143][ T6840] ? submit_bio_checks+0x1aba/0x1f70 [ 71.391481][ T6840] __warn.cold+0x20/0x4a [ 71.395709][ T6840] ? submit_bio_checks+0x1aba/0x1f70 [ 71.400986][ T6840] report_bug+0x1bd/0x210 [ 71.405330][ T6840] handle_bug+0x38/0x90 [ 71.409494][ T6840] ? __warn_printk+0xc6/0xf3 [ 71.414077][ T6840] exc_invalid_op+0x14/0x40 [ 71.418563][ T6840] asm_exc_invalid_op+0x12/0x20 [ 71.423434][ T6840] RIP: 0010:submit_bio_checks+0x1aba/0x1f70 [ 71.429307][ T6840] Code: 04 00 00 45 8b a4 24 a4 05 00 00 48 8d 74 24 68 48 89 ef e8 f8 21 fe ff 48 c7 c7 c0 20 92 88 48 89 c6 44 89 e2 e8 08 23 bf fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 71.448964][ T6840] RSP: 0018:ffffc900016f70f0 EFLAGS: 00010282 [ 71.455050][ T6840] RAX: 0000000000000000 RBX: ffff8880a04c4080 RCX: 0000000000000000 [ 71.463038][ T6840] RDX: ffff8880a05be4c0 RSI: ffffffff815dafc7 RDI: fffff520002dee10 [ 71.471026][ T6840] RBP: ffff8880a32ab800 R08: 0000000000000001 R09: ffff8880ae6318e7 [ 71.479020][ T6840] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 71.486978][ T6840] R13: ffff8880a32ab808 R14: 0000000000000000 R15: ffff8880a32ab828 [ 71.494969][ T6840] ? vprintk_func+0x97/0x1a6 [ 71.499578][ T6840] ? mark_lock+0xbc/0x1710 [ 71.503985][ T6840] ? blk_update_request+0x1230/0x1230 [ 71.509346][ T6840] ? __lock_acquire+0xbb5/0x5640 [ 71.514286][ T6840] submit_bio_noacct+0x89/0x12b0 [ 71.519231][ T6840] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 71.525213][ T6840] ? blk_queue_enter+0xcd0/0xcd0 [ 71.530146][ T6840] ? find_held_lock+0x2d/0x110 [ 71.534905][ T6840] ? bio_associate_blkg_from_css+0x5f3/0x1080 [ 71.540970][ T6840] ? lock_acquire+0x1f1/0xad0 [ 71.545631][ T6840] ? bio_truncate+0x70/0x70 [ 71.550140][ T6840] submit_bio+0x263/0x5b0 [ 71.554459][ T6840] ? submit_bio_noacct+0x12b0/0x12b0 [ 71.559731][ T6840] ? lock_is_held_type+0xbb/0xf0 [ 71.564675][ T6840] submit_bh_wbc+0x685/0x8e0 [ 71.569273][ T6840] __block_write_full_page+0x837/0x12e0 [ 71.574809][ T6840] ? bdev_evict_inode+0x410/0x410 [ 71.579834][ T6840] block_write_full_page+0x214/0x270 [ 71.585105][ T6840] ? bdev_evict_inode+0x410/0x410 [ 71.590131][ T6840] __writepage+0x60/0x170 [ 71.594462][ T6840] write_cache_pages+0x736/0x11b0 [ 71.599480][ T6840] ? tag_pages_for_writeback+0x420/0x420 [ 71.605099][ T6840] ? clear_page_dirty_for_io+0x920/0x920 [ 71.610724][ T6840] ? __lock_acquire+0x16cb/0x5640 [ 71.615739][ T6840] ? blkdev_readahead+0x20/0x20 [ 71.620573][ T6840] generic_writepages+0xe2/0x150 [ 71.625518][ T6840] ? write_cache_pages+0x11b0/0x11b0 [ 71.630803][ T6840] ? find_held_lock+0x2d/0x110 [ 71.635555][ T6840] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 71.641533][ T6840] do_writepages+0xec/0x290 [ 71.646024][ T6840] ? writeback_set_ratelimit+0x150/0x150 [ 71.651642][ T6840] ? do_raw_spin_lock+0x120/0x2b0 [ 71.656652][ T6840] ? do_raw_spin_unlock+0x171/0x230 [ 71.661846][ T6840] ? _raw_spin_unlock+0x24/0x40 [ 71.666709][ T6840] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 71.672695][ T6840] __filemap_fdatawrite_range+0x2a1/0x380 [ 71.678411][ T6840] ? lock_is_held_type+0xbb/0xf0 [ 71.683337][ T6840] ? delete_from_page_cache_batch+0xe20/0xe20 [ 71.689394][ T6840] ? lock_downgrade+0x830/0x830 [ 71.694230][ T6840] ? blkdev_put+0x30/0x520 [ 71.698644][ T6840] filemap_write_and_wait_range+0xe1/0x1c0 [ 71.704439][ T6840] __blkdev_put+0x69a/0x890 [ 71.708932][ T6840] ? fsync_bdev+0xd0/0xd0 [ 71.713256][ T6840] ? locks_remove_file+0x319/0x580 [ 71.718351][ T6840] ? lock_is_held_type+0xbb/0xf0 [ 71.723287][ T6840] ? blkdev_put+0x85/0x520 [ 71.727698][ T6840] blkdev_close+0x8c/0xb0 [ 71.732009][ T6840] __fput+0x285/0x920 [ 71.735977][ T6840] ? blkdev_put+0x520/0x520 [ 71.740475][ T6840] task_work_run+0xdd/0x190 [ 71.744975][ T6840] do_exit+0xb7d/0x29f0 [ 71.749117][ T6840] ? lock_acquire+0x1f1/0xad0 [ 71.753771][ T6840] ? find_held_lock+0x2d/0x110 [ 71.758529][ T6840] ? mm_update_next_owner+0x7a0/0x7a0 [ 71.763894][ T6840] ? get_signal+0x34f/0x1f00 [ 71.768466][ T6840] ? lock_downgrade+0x830/0x830 [ 71.773298][ T6840] ? lock_is_held_type+0xbb/0xf0 [ 71.778219][ T6840] do_group_exit+0x125/0x310 [ 71.782793][ T6840] get_signal+0x428/0x1f00 [ 71.787205][ T6840] ? do_mmap+0x610/0x11d0 [ 71.791520][ T6840] arch_do_signal+0x82/0x2520 [ 71.796181][ T6840] ? vm_mmap_pgoff+0xe8/0x200 [ 71.800858][ T6840] ? randomize_stack_top+0x100/0x100 [ 71.806145][ T6840] ? copy_siginfo_to_user32+0xa0/0xa0 [ 71.811507][ T6840] ? __x64_sys_futex+0x382/0x4e0 [ 71.816435][ T6840] ? exit_to_user_mode_prepare+0xb9/0x1c0 [ 71.822155][ T6840] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 71.828138][ T6840] exit_to_user_mode_prepare+0x15d/0x1c0 [ 71.833762][ T6840] syscall_exit_to_user_mode+0x59/0x2b0 [ 71.839320][ T6840] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 71.845198][ T6840] RIP: 0033:0x445949 [ 71.849077][ T6840] Code: Bad RIP value. [ 71.853136][ T6840] RSP: 002b:00007f0b42fa5db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 71.861532][ T6840] RAX: 0000000000000001 RBX: 00000000006dac38 RCX: 0000000000445949 [ 71.869500][ T6840] RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00000000006dac3c [ 71.877459][ T6840] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 71.885416][ T6840] R10: 0000000000000006 R11: 0000000000000246 R12: 00000000006dac3c [ 71.893386][ T6840] R13: 00007ffcbca04aef R14: 00007f0b42fa69c0 R15: 20c49ba5e353f7cf [ 71.902671][ T6840] Kernel Offset: disabled [ 71.907065][ T6840] Rebooting in 86400 seconds..