Starting Permit User Sessions... Starting getty on tty2-tty6 if dbus and logind are not available... [ OK ] Started Regular background program processing daemon. Starting System Logging Service... [ 59.510036][ T8069] sshd (8069) used greatest stack depth: 22984 bytes left [ OK ] Started Permit User Sessions. [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ 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. Warning: Permanently added '10.128.0.98' (ECDSA) to the list of known hosts. executing program [ 78.160054][ T37] audit: type=1400 audit(1617826867.660:8): avc: denied { execmem } for pid=8384 comm="syz-executor843" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program Debian GNU/Linux 9 syzkaller ttyS0 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 syzkaller login: [ 87.373351][ T25] ------------[ cut here ]------------ [ 87.379103][ T25] Trying to write to read-only block-device sda1 (partno 1) [ 87.389129][ T25] WARNING: CPU: 1 PID: 25 at block/blk-core.c:704 submit_bio_checks+0x165c/0x1aa0 [ 87.413200][ T25] Modules linked in: executing program [ 87.417148][ T25] CPU: 1 PID: 25 Comm: kworker/u4:1 Not tainted 5.12.0-rc6-syzkaller #0 [ 87.427763][ T25] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.438235][ T25] Workqueue: writeback wb_workfn (flush-8:0) [ 87.444496][ T25] RIP: 0010:submit_bio_checks+0x165c/0x1aa0 [ 87.450467][ T25] Code: 00 00 45 0f b6 a4 24 e0 05 00 00 48 8d 74 24 60 48 89 ef e8 c6 3e fe ff 48 c7 c7 a0 76 bf 89 48 89 c6 44 89 e2 e8 09 48 0f 05 <0f> 0b e9 36 f3 ff ff e8 e8 8a c0 fd 0f 0b e9 bf f1 ff ff e8 dc 8a [ 87.470265][ T25] RSP: 0018:ffffc90000e170a8 EFLAGS: 00010286 [ 87.476511][ T25] RAX: 0000000000000000 RBX: ffff88801b79e380 RCX: 0000000000000000 [ 87.503142][ T25] RDX: ffff8880118b22c0 RSI: ffffffff815b8145 RDI: fffff520001c2e07 [ 87.511173][ T25] RBP: ffff88801de26c80 R08: 0000000000000000 R09: 0000000000000000 executing program [ 87.519267][ T25] R10: ffffffff815b0eae R11: 0000000000000000 R12: 0000000000000001 [ 87.527397][ T25] R13: ffff88801de26c90 R14: ffff888017783340 R15: ffff88801b79e88c [ 87.535649][ T25] FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 87.545204][ T25] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 87.552016][ T25] CR2: 0000000000477920 CR3: 000000000bc8e000 CR4: 00000000001506f0 [ 87.561489][ T25] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 87.570216][ T25] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 executing program [ 87.603197][ T25] Call Trace: [ 87.606538][ T25] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 87.614182][ T25] ? __lock_acquire+0xb43/0x54c0 [ 87.619195][ T25] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 87.625666][ T25] submit_bio_noacct+0x81/0xf20 [ 87.630586][ T25] ? blk_queue_enter+0xb50/0xb50 [ 87.636065][ T25] ? bio_associate_blkg_from_css+0x563/0xf60 [ 87.643664][ T25] ? lock_downgrade+0x6e0/0x6e0 executing program [ 87.655433][ T25] submit_bio+0x263/0x5e0 [ 87.659907][ T25] ? submit_bio_noacct+0xf20/0xf20 [ 87.666858][ T25] ? bio_add_page+0x186/0x1f0 [ 87.671674][ T25] ? __bio_try_merge_page+0x350/0x350 [ 87.678901][ T25] submit_bh_wbc+0x5eb/0x7f0 [ 87.684599][ T25] __block_write_full_page+0x86c/0x1340 [ 87.690287][ T25] ? bdev_disk_changed+0x3c0/0x3c0 [ 87.696406][ T25] block_write_full_page+0x14d/0x190 [ 87.701728][ T25] ? bdev_disk_changed+0x3c0/0x3c0 [ 87.707682][ T25] __writepage+0x60/0x180 [ 87.718253][ T25] write_cache_pages+0x759/0x11a0 [ 87.723978][ T25] ? tag_pages_for_writeback+0x450/0x450 [ 87.730885][ T25] ? clear_page_dirty_for_io+0xa10/0xa10 [ 87.741848][ T25] ? __lock_acquire+0x16b3/0x54c0 [ 87.747985][ T25] ? blkdev_readahead+0x20/0x20 executing program [ 87.752891][ T25] generic_writepages+0xe2/0x150 [ 87.759128][ T25] ? write_cache_pages+0x11a0/0x11a0 [ 87.765169][ T25] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 87.771883][ T25] do_writepages+0xec/0x290 [ 87.777928][ T25] ? writeback_set_ratelimit+0x150/0x150 executing program [ 87.803174][ T25] ? lock_downgrade+0x6e0/0x6e0 [ 87.808168][ T25] ? writeback_sb_inodes+0x3a6/0xef0 [ 87.814829][ T25] __writeback_single_inode+0x126/0xfd0 [ 87.820385][ T25] ? wbc_attach_and_unlock_inode+0x117/0x9e0 [ 87.827000][ T25] writeback_sb_inodes+0x53d/0xef0 [ 87.832184][ T25] ? __writeback_single_inode+0xfd0/0xfd0 [ 87.838298][ T25] __writeback_inodes_wb+0xc6/0x280 [ 87.845418][ T25] wb_writeback+0x814/0xc40 executing program [ 87.863225][ T25] ? __writeback_inodes_wb+0x280/0x280 [ 87.868780][ T25] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 87.875524][ T25] ? _find_next_bit.constprop.0+0x1a0/0x200 [ 87.881556][ T25] ? cpumask_next+0x3c/0x40 [ 87.886681][ T25] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 87.892459][ T25] ? get_nr_dirty_inodes+0x1b2/0x250 [ 87.898682][ T25] wb_workfn+0x891/0x12d0 [ 87.903695][ T25] ? inode_wait_for_writeback+0x30/0x30 [ 87.909816][ T25] ? lock_release+0x720/0x720 [ 87.917444][ T25] process_one_work+0x98d/0x1600 [ 87.922426][ T25] ? pwq_dec_nr_in_flight+0x320/0x320 [ 87.931872][ T25] ? rwlock_bug.part.0+0x90/0x90 [ 87.937361][ T25] ? _raw_spin_lock_irq+0x41/0x50 [ 87.942530][ T25] worker_thread+0x64c/0x1120 [ 87.947899][ T25] ? process_one_work+0x1600/0x1600 [ 87.953453][ T25] kthread+0x3b1/0x4a0 [ 87.957656][ T25] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 87.964020][ T25] ret_from_fork+0x1f/0x30 [ 87.968579][ T25] Kernel panic - not syncing: panic_on_warn set ... [ 87.975166][ T25] CPU: 0 PID: 25 Comm: kworker/u4:1 Not tainted 5.12.0-rc6-syzkaller #0 [ 87.983482][ T25] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.993528][ T25] Workqueue: writeback wb_workfn (flush-8:0) [ 87.999510][ T25] Call Trace: [ 88.002788][ T25] dump_stack+0x141/0x1d7 [ 88.007377][ T25] panic+0x306/0x73d [ 88.011260][ T25] ? __warn_printk+0xf3/0xf3 [ 88.015846][ T25] ? __warn.cold+0x1a/0x44 [ 88.020262][ T25] ? submit_bio_checks+0x165c/0x1aa0 [ 88.025545][ T25] __warn.cold+0x35/0x44 [ 88.029783][ T25] ? wake_up_klogd.part.0+0x8e/0xd0 [ 88.034976][ T25] ? submit_bio_checks+0x165c/0x1aa0 [ 88.040300][ T25] report_bug+0x1bd/0x210 [ 88.044656][ T25] handle_bug+0x3c/0x60 [ 88.048810][ T25] exc_invalid_op+0x14/0x40 [ 88.053311][ T25] asm_exc_invalid_op+0x12/0x20 [ 88.058186][ T25] RIP: 0010:submit_bio_checks+0x165c/0x1aa0 [ 88.064088][ T25] Code: 00 00 45 0f b6 a4 24 e0 05 00 00 48 8d 74 24 60 48 89 ef e8 c6 3e fe ff 48 c7 c7 a0 76 bf 89 48 89 c6 44 89 e2 e8 09 48 0f 05 <0f> 0b e9 36 f3 ff ff e8 e8 8a c0 fd 0f 0b e9 bf f1 ff ff e8 dc 8a [ 88.083690][ T25] RSP: 0018:ffffc90000e170a8 EFLAGS: 00010286 [ 88.089763][ T25] RAX: 0000000000000000 RBX: ffff88801b79e380 RCX: 0000000000000000 [ 88.097726][ T25] RDX: ffff8880118b22c0 RSI: ffffffff815b8145 RDI: fffff520001c2e07 [ 88.105880][ T25] RBP: ffff88801de26c80 R08: 0000000000000000 R09: 0000000000000000 [ 88.114307][ T25] R10: ffffffff815b0eae R11: 0000000000000000 R12: 0000000000000001 [ 88.122264][ T25] R13: ffff88801de26c90 R14: ffff888017783340 R15: ffff88801b79e88c [ 88.130222][ T25] ? wake_up_klogd.part.0+0x8e/0xd0 [ 88.135428][ T25] ? vprintk_func+0x95/0x1e0 [ 88.140053][ T25] ? submit_bio_checks+0x165c/0x1aa0 [ 88.145364][ T25] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 88.152291][ T25] ? __lock_acquire+0xb43/0x54c0 [ 88.157217][ T25] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 88.163190][ T25] submit_bio_noacct+0x81/0xf20 [ 88.168069][ T25] ? blk_queue_enter+0xb50/0xb50 [ 88.172993][ T25] ? bio_associate_blkg_from_css+0x563/0xf60 [ 88.178966][ T25] ? lock_downgrade+0x6e0/0x6e0 [ 88.183806][ T25] submit_bio+0x263/0x5e0 [ 88.188134][ T25] ? submit_bio_noacct+0xf20/0xf20 [ 88.193230][ T25] ? bio_add_page+0x186/0x1f0 [ 88.197910][ T25] ? __bio_try_merge_page+0x350/0x350 [ 88.203275][ T25] submit_bh_wbc+0x5eb/0x7f0 [ 88.207866][ T25] __block_write_full_page+0x86c/0x1340 [ 88.213411][ T25] ? bdev_disk_changed+0x3c0/0x3c0 [ 88.218507][ T25] block_write_full_page+0x14d/0x190 [ 88.223778][ T25] ? bdev_disk_changed+0x3c0/0x3c0 [ 88.228875][ T25] __writepage+0x60/0x180 [ 88.233191][ T25] write_cache_pages+0x759/0x11a0 [ 88.238462][ T25] ? tag_pages_for_writeback+0x450/0x450 [ 88.244251][ T25] ? clear_page_dirty_for_io+0xa10/0xa10 [ 88.251003][ T25] ? __lock_acquire+0x16b3/0x54c0 [ 88.256232][ T25] ? blkdev_readahead+0x20/0x20 [ 88.261350][ T25] generic_writepages+0xe2/0x150 [ 88.266277][ T25] ? write_cache_pages+0x11a0/0x11a0 [ 88.271551][ T25] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 88.277521][ T25] do_writepages+0xec/0x290 [ 88.282021][ T25] ? writeback_set_ratelimit+0x150/0x150 [ 88.287645][ T25] ? lock_downgrade+0x6e0/0x6e0 [ 88.292501][ T25] ? writeback_sb_inodes+0x3a6/0xef0 [ 88.297790][ T25] __writeback_single_inode+0x126/0xfd0 [ 88.303343][ T25] ? wbc_attach_and_unlock_inode+0x117/0x9e0 [ 88.309312][ T25] writeback_sb_inodes+0x53d/0xef0 [ 88.314432][ T25] ? __writeback_single_inode+0xfd0/0xfd0 [ 88.320159][ T25] __writeback_inodes_wb+0xc6/0x280 [ 88.325349][ T25] wb_writeback+0x814/0xc40 [ 88.329844][ T25] ? __writeback_inodes_wb+0x280/0x280 [ 88.335400][ T25] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 88.341119][ T25] ? _find_next_bit.constprop.0+0x1a0/0x200 [ 88.347009][ T25] ? cpumask_next+0x3c/0x40 [ 88.351594][ T25] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 88.357319][ T25] ? get_nr_dirty_inodes+0x1b2/0x250 [ 88.362603][ T25] wb_workfn+0x891/0x12d0 [ 88.366929][ T25] ? inode_wait_for_writeback+0x30/0x30 [ 88.372467][ T25] ? lock_release+0x720/0x720 [ 88.377144][ T25] process_one_work+0x98d/0x1600 [ 88.382067][ T25] ? pwq_dec_nr_in_flight+0x320/0x320 [ 88.387428][ T25] ? rwlock_bug.part.0+0x90/0x90 [ 88.398214][ T25] ? _raw_spin_lock_irq+0x41/0x50 [ 88.403409][ T25] worker_thread+0x64c/0x1120 [ 88.408076][ T25] ? process_one_work+0x1600/0x1600 [ 88.414137][ T25] kthread+0x3b1/0x4a0 [ 88.418196][ T25] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 88.424092][ T25] ret_from_fork+0x1f/0x30 [ 88.429159][ T25] Kernel Offset: disabled [ 88.433600][ T25] Rebooting in 86400 seconds..