[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.240' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 93.168159][ T37] audit: type=1400 audit(1629053273.810:8): avc: denied { execmem } for pid=8454 comm="syz-executor656" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 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 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 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 [ 106.352617][ T3123] ------------[ cut here ]------------ [ 106.358348][ T3123] Trying to write to read-only block-device sda1 (partno 1) [ 106.369008][ T3123] WARNING: CPU: 1 PID: 3123 at block/blk-core.c:701 submit_bio_checks+0x160c/0x1a80 [ 106.379710][ T3123] Modules linked in: [ 106.384431][ T3123] CPU: 1 PID: 3123 Comm: kworker/u4:6 Not tainted 5.14.0-rc5-syzkaller #0 [ 106.393118][ T3123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 106.403432][ T3123] Workqueue: writeback wb_workfn (flush-8:0) [ 106.409477][ T3123] RIP: 0010:submit_bio_checks+0x160c/0x1a80 [ 106.415626][ T3123] Code: 00 00 45 0f b6 a4 24 50 05 00 00 48 8d 74 24 60 48 89 ef e8 76 47 fe ff 48 c7 c7 c0 11 e1 89 48 89 c6 44 89 e2 e8 c8 2b 28 05 <0f> 0b e9 86 f3 ff ff e8 68 ad b4 fd e8 b3 7d 6a 05 31 ff 89 c3 89 [ 106.436158][ T3123] RSP: 0018:ffffc90002f17130 EFLAGS: 00010282 [ 106.442418][ T3123] RAX: 0000000000000000 RBX: ffff88801d8cb140 RCX: 0000000000000000 executing program [ 106.451100][ T3123] RDX: ffff8880216661c0 RSI: ffffffff815cb9a5 RDI: fffff520005e2e18 [ 106.459189][ T3123] RBP: ffff88801beaf080 R08: 0000000000000000 R09: 0000000000000000 [ 106.468192][ T3123] R10: ffffffff815c57ae R11: 0000000000000000 R12: 0000000000000001 [ 106.476979][ T3123] R13: ffff88801beaf090 R14: ffff8880204ad000 R15: ffff88801d8cb6b4 [ 106.485783][ T3123] FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 106.495557][ T3123] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 106.502885][ T3123] CR2: 00007f6cfb17b000 CR3: 0000000017123000 CR4: 00000000001506f0 [ 106.536488][ T3123] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 106.545342][ T3123] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 executing program [ 106.554023][ T3123] Call Trace: [ 106.557315][ T3123] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 106.565367][ T3123] ? __ext4_handle_dirty_metadata+0x23b/0x720 [ 106.579936][ T3123] ? __brelse+0x84/0xa0 [ 106.584149][ T3123] submit_bio_noacct+0x81/0xf20 [ 106.589036][ T3123] ? blk_queue_enter+0xb60/0xb60 executing program [ 106.609358][ T3123] ? ext4_reserve_inode_write+0x114/0x230 [ 106.616378][ T3123] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 106.622830][ T3123] ? mpage_release_unused_pages+0x5ef/0x8a0 [ 106.628733][ T3123] ? x86_pmu_disable_all+0x12c/0x350 [ 106.635145][ T3123] ? ext4_set_iomap+0xa70/0xa70 [ 106.642129][ T3123] submit_bio+0x1ea/0x470 [ 106.652002][ T3123] ? submit_bio_noacct+0xf20/0xf20 executing program [ 106.657419][ T3123] ? downgrade_write+0x3a0/0x3a0 [ 106.666303][ T3123] ? down_write_killable_nested+0x180/0x180 [ 106.673290][ T3123] ext4_io_submit+0x181/0x210 [ 106.678009][ T3123] ext4_writepages+0x1452/0x3ba0 [ 106.684992][ T3123] ? __ext4_mark_inode_dirty+0x8d0/0x8d0 [ 106.692219][ T3123] ? __ext4_mark_inode_dirty+0x8d0/0x8d0 [ 106.697878][ T3123] do_writepages+0xec/0x290 [ 106.704024][ T3123] ? writeback_set_ratelimit+0x150/0x150 [ 106.711470][ T3123] ? lock_downgrade+0x6e0/0x6e0 [ 106.721205][ T3123] ? writeback_sb_inodes+0x3a6/0xf00 [ 106.726538][ T3123] __writeback_single_inode+0x126/0xff0 [ 106.734982][ T3123] ? wbc_attach_and_unlock_inode+0x111/0x9d0 [ 106.742251][ T3123] writeback_sb_inodes+0x53d/0xf00 [ 106.747394][ T3123] ? sync_inode_metadata+0xd0/0xd0 [ 106.754081][ T3123] __writeback_inodes_wb+0xc6/0x280 executing program [ 106.759698][ T3123] wb_writeback+0x814/0xc50 [ 106.765690][ T3123] ? __writeback_inodes_wb+0x280/0x280 [ 106.772015][ T3123] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 106.778461][ T3123] ? cpumask_next+0xa4/0xf0 [ 106.784703][ T3123] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 106.799946][ T3123] ? get_nr_dirty_inodes+0x16f/0x210 [ 106.805284][ T3123] wb_workfn+0x8cf/0x12d0 executing program [ 106.809636][ T3123] ? inode_wait_for_writeback+0x30/0x30 [ 106.819929][ T3123] ? lock_release+0x720/0x720 [ 106.824755][ T3123] process_one_work+0x98d/0x1630 [ 106.829930][ T3123] ? pwq_dec_nr_in_flight+0x320/0x320 [ 106.835480][ T3123] ? rwlock_bug.part.0+0x90/0x90 [ 106.840550][ T3123] ? _raw_spin_lock_irq+0x41/0x50 [ 106.846016][ T3123] worker_thread+0x658/0x11f0 [ 106.850976][ T3123] ? process_one_work+0x1630/0x1630 [ 106.856904][ T3123] kthread+0x3e5/0x4d0 [ 106.861771][ T3123] ? set_kthread_struct+0x130/0x130 [ 106.876022][ T3123] ret_from_fork+0x1f/0x30 [ 106.886647][ T3123] Kernel panic - not syncing: panic_on_warn set ... [ 106.893268][ T3123] CPU: 1 PID: 3123 Comm: kworker/u4:6 Not tainted 5.14.0-rc5-syzkaller #0 [ 106.901788][ T3123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 106.911941][ T3123] Workqueue: writeback wb_workfn (flush-8:0) [ 106.917928][ T3123] Call Trace: [ 106.921209][ T3123] dump_stack_lvl+0xcd/0x134 [ 106.925806][ T3123] panic+0x306/0x73d [ 106.929711][ T3123] ? __warn_printk+0xf3/0xf3 [ 106.934284][ T3123] ? __warn.cold+0x1a/0x44 [ 106.938680][ T3123] ? submit_bio_checks+0x160c/0x1a80 [ 106.943951][ T3123] __warn.cold+0x35/0x44 [ 106.948177][ T3123] ? submit_bio_checks+0x160c/0x1a80 [ 106.953450][ T3123] report_bug+0x1bd/0x210 [ 106.957764][ T3123] handle_bug+0x3c/0x60 [ 106.961905][ T3123] exc_invalid_op+0x14/0x40 [ 106.966398][ T3123] asm_exc_invalid_op+0x12/0x20 [ 106.971249][ T3123] RIP: 0010:submit_bio_checks+0x160c/0x1a80 [ 106.977129][ T3123] Code: 00 00 45 0f b6 a4 24 50 05 00 00 48 8d 74 24 60 48 89 ef e8 76 47 fe ff 48 c7 c7 c0 11 e1 89 48 89 c6 44 89 e2 e8 c8 2b 28 05 <0f> 0b e9 86 f3 ff ff e8 68 ad b4 fd e8 b3 7d 6a 05 31 ff 89 c3 89 [ 106.996735][ T3123] RSP: 0018:ffffc90002f17130 EFLAGS: 00010282 [ 107.002786][ T3123] RAX: 0000000000000000 RBX: ffff88801d8cb140 RCX: 0000000000000000 [ 107.010748][ T3123] RDX: ffff8880216661c0 RSI: ffffffff815cb9a5 RDI: fffff520005e2e18 [ 107.018720][ T3123] RBP: ffff88801beaf080 R08: 0000000000000000 R09: 0000000000000000 [ 107.026693][ T3123] R10: ffffffff815c57ae R11: 0000000000000000 R12: 0000000000000001 [ 107.034650][ T3123] R13: ffff88801beaf090 R14: ffff8880204ad000 R15: ffff88801d8cb6b4 [ 107.042607][ T3123] ? wake_up_klogd.part.0+0x8e/0xd0 [ 107.047799][ T3123] ? vprintk+0x95/0x260 [ 107.051942][ T3123] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 107.058866][ T3123] ? __ext4_handle_dirty_metadata+0x23b/0x720 [ 107.064941][ T3123] ? __brelse+0x84/0xa0 [ 107.069084][ T3123] submit_bio_noacct+0x81/0xf20 [ 107.073923][ T3123] ? blk_queue_enter+0xb60/0xb60 [ 107.078846][ T3123] ? ext4_reserve_inode_write+0x114/0x230 [ 107.084552][ T3123] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 107.090345][ T3123] ? mpage_release_unused_pages+0x5ef/0x8a0 [ 107.096225][ T3123] ? x86_pmu_disable_all+0x12c/0x350 [ 107.101508][ T3123] ? ext4_set_iomap+0xa70/0xa70 [ 107.106363][ T3123] submit_bio+0x1ea/0x470 [ 107.110739][ T3123] ? submit_bio_noacct+0xf20/0xf20 [ 107.115855][ T3123] ? downgrade_write+0x3a0/0x3a0 [ 107.120798][ T3123] ? down_write_killable_nested+0x180/0x180 [ 107.126710][ T3123] ext4_io_submit+0x181/0x210 [ 107.131376][ T3123] ext4_writepages+0x1452/0x3ba0 [ 107.136314][ T3123] ? __ext4_mark_inode_dirty+0x8d0/0x8d0 [ 107.141965][ T3123] ? __ext4_mark_inode_dirty+0x8d0/0x8d0 [ 107.147597][ T3123] do_writepages+0xec/0x290 [ 107.152091][ T3123] ? writeback_set_ratelimit+0x150/0x150 [ 107.157708][ T3123] ? lock_downgrade+0x6e0/0x6e0 [ 107.162588][ T3123] ? writeback_sb_inodes+0x3a6/0xf00 [ 107.167884][ T3123] __writeback_single_inode+0x126/0xff0 [ 107.173429][ T3123] ? wbc_attach_and_unlock_inode+0x111/0x9d0 [ 107.179405][ T3123] writeback_sb_inodes+0x53d/0xf00 [ 107.184527][ T3123] ? sync_inode_metadata+0xd0/0xd0 [ 107.189639][ T3123] __writeback_inodes_wb+0xc6/0x280 [ 107.194826][ T3123] wb_writeback+0x814/0xc50 [ 107.199321][ T3123] ? __writeback_inodes_wb+0x280/0x280 [ 107.204764][ T3123] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 107.210993][ T3123] ? cpumask_next+0xa4/0xf0 [ 107.215503][ T3123] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 107.221216][ T3123] ? get_nr_dirty_inodes+0x16f/0x210 [ 107.226485][ T3123] wb_workfn+0x8cf/0x12d0 [ 107.230800][ T3123] ? inode_wait_for_writeback+0x30/0x30 [ 107.236332][ T3123] ? lock_release+0x720/0x720 [ 107.240992][ T3123] process_one_work+0x98d/0x1630 [ 107.245927][ T3123] ? pwq_dec_nr_in_flight+0x320/0x320 [ 107.251285][ T3123] ? rwlock_bug.part.0+0x90/0x90 [ 107.256208][ T3123] ? _raw_spin_lock_irq+0x41/0x50 [ 107.261219][ T3123] worker_thread+0x658/0x11f0 [ 107.265886][ T3123] ? process_one_work+0x1630/0x1630 [ 107.271070][ T3123] kthread+0x3e5/0x4d0 [ 107.275136][ T3123] ? set_kthread_struct+0x130/0x130 [ 107.280319][ T3123] ret_from_fork+0x1f/0x30 [ 107.286437][ T3123] Kernel Offset: disabled [ 107.290913][ T3123] Rebooting in 86400 seconds..