[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.177' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.450330][ T6876] ------------[ cut here ]------------ [ 57.455798][ T6876] Trying to write to read-only block-device nullb0 (partno 0) [ 57.463844][ T6876] WARNING: CPU: 1 PID: 6876 at block/blk-core.c:857 submit_bio_checks+0x1aba/0x1f70 [ 57.473258][ T6876] Modules linked in: [ 57.477196][ T6876] CPU: 1 PID: 6876 Comm: syz-executor299 Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 [ 57.487490][ T6876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.497661][ T6876] RIP: 0010:submit_bio_checks+0x1aba/0x1f70 [ 57.503646][ T6876] 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 80 47 92 88 48 89 c6 44 89 e2 e8 51 ed bd fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 57.523339][ T6876] RSP: 0018:ffffc900016270f0 EFLAGS: 00010282 [ 57.529455][ T6876] RAX: 0000000000000000 RBX: ffff8880a0436080 RCX: 0000000000000000 [ 57.537443][ T6876] RDX: ffff8880a80e2180 RSI: ffffffff815da447 RDI: fffff520002c4e10 [ 57.545495][ T6876] RBP: ffff88809efef340 R08: 0000000000000001 R09: ffff8880ae7318a7 [ 57.553540][ T6876] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 57.561596][ T6876] R13: ffff88809efef348 R14: 0000000000000000 R15: ffff88809efef368 [ 57.569615][ T6876] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 57.578555][ T6876] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.585247][ T6876] CR2: 0000000020000180 CR3: 0000000009a8d000 CR4: 00000000001506e0 [ 57.593355][ T6876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.601408][ T6876] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.609459][ T6876] Call Trace: [ 57.612769][ T6876] ? mark_lock+0xbc/0x1710 [ 57.617165][ T6876] ? blk_update_request+0x1230/0x1230 [ 57.622576][ T6876] ? __lock_acquire+0xbb5/0x5640 [ 57.627522][ T6876] submit_bio_noacct+0x89/0x12b0 [ 57.632531][ T6876] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 57.638505][ T6876] ? blk_queue_enter+0xcd0/0xcd0 [ 57.643487][ T6876] ? find_held_lock+0x2d/0x110 [ 57.648260][ T6876] ? bio_associate_blkg_from_css+0x5f3/0x1080 [ 57.654411][ T6876] ? lock_acquire+0x1f1/0xad0 [ 57.659172][ T6876] ? bio_truncate+0x70/0x70 [ 57.663668][ T6876] submit_bio+0x263/0x5b0 [ 57.667990][ T6876] ? submit_bio_noacct+0x12b0/0x12b0 [ 57.673377][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 57.678326][ T6876] submit_bh_wbc+0x685/0x8e0 [ 57.682967][ T6876] __block_write_full_page+0x837/0x12e0 [ 57.688528][ T6876] ? bdev_evict_inode+0x410/0x410 [ 57.693635][ T6876] block_write_full_page+0x214/0x270 [ 57.699016][ T6876] ? bdev_evict_inode+0x410/0x410 [ 57.704053][ T6876] __writepage+0x60/0x170 [ 57.708382][ T6876] write_cache_pages+0x736/0x11b0 [ 57.713460][ T6876] ? tag_pages_for_writeback+0x450/0x450 [ 57.719202][ T6876] ? clear_page_dirty_for_io+0x920/0x920 [ 57.724826][ T6876] ? __lock_acquire+0x16cb/0x5640 [ 57.729893][ T6876] ? blkdev_readahead+0x20/0x20 [ 57.734755][ T6876] generic_writepages+0xe2/0x150 [ 57.739794][ T6876] ? write_cache_pages+0x11b0/0x11b0 [ 57.745082][ T6876] ? find_held_lock+0x2d/0x110 [ 57.749888][ T6876] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 57.755886][ T6876] do_writepages+0xec/0x290 [ 57.760457][ T6876] ? writeback_set_ratelimit+0x150/0x150 [ 57.766086][ T6876] ? do_raw_spin_lock+0x120/0x2b0 [ 57.771153][ T6876] ? do_raw_spin_unlock+0x171/0x230 [ 57.776381][ T6876] ? _raw_spin_unlock+0x24/0x40 [ 57.781309][ T6876] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 57.787304][ T6876] __filemap_fdatawrite_range+0x2a1/0x380 [ 57.793087][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 57.798022][ T6876] ? delete_from_page_cache_batch+0xe20/0xe20 [ 57.804167][ T6876] ? lock_downgrade+0x830/0x830 [ 57.809072][ T6876] ? blkdev_put+0x30/0x520 [ 57.813488][ T6876] filemap_write_and_wait_range+0xe1/0x1c0 [ 57.819377][ T6876] __blkdev_put+0x69a/0x890 [ 57.823879][ T6876] ? fsync_bdev+0xd0/0xd0 [ 57.828210][ T6876] ? locks_remove_file+0x319/0x580 [ 57.833363][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 57.838320][ T6876] ? blkdev_put+0x85/0x520 [ 57.842813][ T6876] blkdev_close+0x8c/0xb0 [ 57.847160][ T6876] __fput+0x285/0x920 [ 57.851196][ T6876] ? blkdev_put+0x520/0x520 [ 57.855735][ T6876] task_work_run+0xdd/0x190 [ 57.860330][ T6876] do_exit+0xb7d/0x29f0 [ 57.864483][ T6876] ? lock_acquire+0x1f1/0xad0 [ 57.869203][ T6876] ? find_held_lock+0x2d/0x110 [ 57.873982][ T6876] ? mm_update_next_owner+0x7a0/0x7a0 [ 57.879457][ T6876] ? get_signal+0x34f/0x1f00 [ 57.884053][ T6876] ? lock_downgrade+0x830/0x830 [ 57.888942][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 57.893897][ T6876] do_group_exit+0x125/0x310 [ 57.898467][ T6876] get_signal+0x428/0x1f00 [ 57.902971][ T6876] ? do_mmap+0x610/0x11d0 [ 57.907322][ T6876] arch_do_signal+0x82/0x2520 [ 57.912038][ T6876] ? vm_mmap_pgoff+0xe8/0x200 [ 57.916730][ T6876] ? randomize_stack_top+0x100/0x100 [ 57.922094][ T6876] ? copy_siginfo_to_user32+0xa0/0xa0 [ 57.927478][ T6876] ? __x64_sys_futex+0x382/0x4e0 [ 57.932470][ T6876] ? exit_to_user_mode_prepare+0xb9/0x1c0 [ 57.938195][ T6876] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 57.944365][ T6876] exit_to_user_mode_prepare+0x15d/0x1c0 [ 57.950120][ T6876] syscall_exit_to_user_mode+0x59/0x2b0 [ 57.955664][ T6876] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.961620][ T6876] RIP: 0033:0x445949 [ 57.965511][ T6876] Code: Bad RIP value. [ 57.969615][ T6876] RSP: 002b:00007f2125632db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 57.978049][ T6876] RAX: 0000000000000001 RBX: 00000000006dac38 RCX: 0000000000445949 [ 57.986120][ T6876] RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00000000006dac3c [ 57.994149][ T6876] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 58.002205][ T6876] R10: 0000000000000004 R11: 0000000000000246 R12: 00000000006dac3c [ 58.010241][ T6876] R13: 00007ffe62415d0f R14: 00007f21256339c0 R15: 20c49ba5e353f7cf [ 58.018227][ T6876] Kernel panic - not syncing: panic_on_warn set ... [ 58.024803][ T6876] CPU: 1 PID: 6876 Comm: syz-executor299 Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 [ 58.034660][ T6876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.044692][ T6876] Call Trace: [ 58.047967][ T6876] dump_stack+0x18f/0x20d [ 58.052290][ T6876] panic+0x2e3/0x75c [ 58.056164][ T6876] ? __warn_printk+0xf3/0xf3 [ 58.060750][ T6876] ? __warn.cold+0x1d/0xc1 [ 58.065151][ T6876] ? __warn.cold+0x14/0xc1 [ 58.069547][ T6876] ? submit_bio_checks+0x1aba/0x1f70 [ 58.074806][ T6876] __warn.cold+0x38/0xc1 [ 58.079027][ T6876] ? submit_bio_checks+0x1aba/0x1f70 [ 58.084302][ T6876] report_bug+0x1bd/0x210 [ 58.088614][ T6876] handle_bug+0x38/0x90 [ 58.092756][ T6876] ? __warn_printk+0xc6/0xf3 [ 58.097340][ T6876] exc_invalid_op+0x14/0x40 [ 58.101821][ T6876] asm_exc_invalid_op+0x12/0x20 [ 58.106650][ T6876] RIP: 0010:submit_bio_checks+0x1aba/0x1f70 [ 58.112532][ T6876] 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 80 47 92 88 48 89 c6 44 89 e2 e8 51 ed bd fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 58.132125][ T6876] RSP: 0018:ffffc900016270f0 EFLAGS: 00010282 [ 58.138171][ T6876] RAX: 0000000000000000 RBX: ffff8880a0436080 RCX: 0000000000000000 [ 58.146130][ T6876] RDX: ffff8880a80e2180 RSI: ffffffff815da447 RDI: fffff520002c4e10 [ 58.154079][ T6876] RBP: ffff88809efef340 R08: 0000000000000001 R09: ffff8880ae7318a7 [ 58.162031][ T6876] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 58.169995][ T6876] R13: ffff88809efef348 R14: 0000000000000000 R15: ffff88809efef368 [ 58.177964][ T6876] ? vprintk_func+0x97/0x1a6 [ 58.182539][ T6876] ? mark_lock+0xbc/0x1710 [ 58.186943][ T6876] ? blk_update_request+0x1230/0x1230 [ 58.192290][ T6876] ? __lock_acquire+0xbb5/0x5640 [ 58.197216][ T6876] submit_bio_noacct+0x89/0x12b0 [ 58.202143][ T6876] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 58.208098][ T6876] ? blk_queue_enter+0xcd0/0xcd0 [ 58.213012][ T6876] ? find_held_lock+0x2d/0x110 [ 58.217753][ T6876] ? bio_associate_blkg_from_css+0x5f3/0x1080 [ 58.223798][ T6876] ? lock_acquire+0x1f1/0xad0 [ 58.228468][ T6876] ? bio_truncate+0x70/0x70 [ 58.232972][ T6876] submit_bio+0x263/0x5b0 [ 58.237278][ T6876] ? submit_bio_noacct+0x12b0/0x12b0 [ 58.242553][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 58.247482][ T6876] submit_bh_wbc+0x685/0x8e0 [ 58.252053][ T6876] __block_write_full_page+0x837/0x12e0 [ 58.257588][ T6876] ? bdev_evict_inode+0x410/0x410 [ 58.262591][ T6876] block_write_full_page+0x214/0x270 [ 58.267970][ T6876] ? bdev_evict_inode+0x410/0x410 [ 58.272973][ T6876] __writepage+0x60/0x170 [ 58.277288][ T6876] write_cache_pages+0x736/0x11b0 [ 58.282456][ T6876] ? tag_pages_for_writeback+0x450/0x450 [ 58.288065][ T6876] ? clear_page_dirty_for_io+0x920/0x920 [ 58.293689][ T6876] ? __lock_acquire+0x16cb/0x5640 [ 58.298695][ T6876] ? blkdev_readahead+0x20/0x20 [ 58.303519][ T6876] generic_writepages+0xe2/0x150 [ 58.308443][ T6876] ? write_cache_pages+0x11b0/0x11b0 [ 58.313731][ T6876] ? find_held_lock+0x2d/0x110 [ 58.318482][ T6876] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 58.324447][ T6876] do_writepages+0xec/0x290 [ 58.328931][ T6876] ? writeback_set_ratelimit+0x150/0x150 [ 58.334553][ T6876] ? do_raw_spin_lock+0x120/0x2b0 [ 58.339558][ T6876] ? do_raw_spin_unlock+0x171/0x230 [ 58.344732][ T6876] ? _raw_spin_unlock+0x24/0x40 [ 58.349573][ T6876] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 58.355529][ T6876] __filemap_fdatawrite_range+0x2a1/0x380 [ 58.361226][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 58.366141][ T6876] ? delete_from_page_cache_batch+0xe20/0xe20 [ 58.372191][ T6876] ? lock_downgrade+0x830/0x830 [ 58.377018][ T6876] ? blkdev_put+0x30/0x520 [ 58.381411][ T6876] filemap_write_and_wait_range+0xe1/0x1c0 [ 58.387196][ T6876] __blkdev_put+0x69a/0x890 [ 58.391679][ T6876] ? fsync_bdev+0xd0/0xd0 [ 58.395994][ T6876] ? locks_remove_file+0x319/0x580 [ 58.402044][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 58.406962][ T6876] ? blkdev_put+0x85/0x520 [ 58.411359][ T6876] blkdev_close+0x8c/0xb0 [ 58.415668][ T6876] __fput+0x285/0x920 [ 58.419663][ T6876] ? blkdev_put+0x520/0x520 [ 58.424145][ T6876] task_work_run+0xdd/0x190 [ 58.428630][ T6876] do_exit+0xb7d/0x29f0 [ 58.432764][ T6876] ? lock_acquire+0x1f1/0xad0 [ 58.437428][ T6876] ? find_held_lock+0x2d/0x110 [ 58.442174][ T6876] ? mm_update_next_owner+0x7a0/0x7a0 [ 58.447527][ T6876] ? get_signal+0x34f/0x1f00 [ 58.452099][ T6876] ? lock_downgrade+0x830/0x830 [ 58.456971][ T6876] ? lock_is_held_type+0xbb/0xf0 [ 58.461888][ T6876] do_group_exit+0x125/0x310 [ 58.466456][ T6876] get_signal+0x428/0x1f00 [ 58.470883][ T6876] ? do_mmap+0x610/0x11d0 [ 58.475193][ T6876] arch_do_signal+0x82/0x2520 [ 58.479854][ T6876] ? vm_mmap_pgoff+0xe8/0x200 [ 58.484508][ T6876] ? randomize_stack_top+0x100/0x100 [ 58.489772][ T6876] ? copy_siginfo_to_user32+0xa0/0xa0 [ 58.495134][ T6876] ? __x64_sys_futex+0x382/0x4e0 [ 58.500066][ T6876] ? exit_to_user_mode_prepare+0xb9/0x1c0 [ 58.505761][ T6876] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 58.511723][ T6876] exit_to_user_mode_prepare+0x15d/0x1c0 [ 58.517335][ T6876] syscall_exit_to_user_mode+0x59/0x2b0 [ 58.522884][ T6876] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.528756][ T6876] RIP: 0033:0x445949 [ 58.532621][ T6876] Code: Bad RIP value. [ 58.536669][ T6876] RSP: 002b:00007f2125632db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 58.545070][ T6876] RAX: 0000000000000001 RBX: 00000000006dac38 RCX: 0000000000445949 [ 58.553054][ T6876] RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00000000006dac3c [ 58.561016][ T6876] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 58.568981][ T6876] R10: 0000000000000004 R11: 0000000000000246 R12: 00000000006dac3c [ 58.576960][ T6876] R13: 00007ffe62415d0f R14: 00007f21256339c0 R15: 20c49ba5e353f7cf [ 58.586167][ T6876] Kernel Offset: disabled [ 58.590537][ T6876] Rebooting in 86400 seconds..