Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.103' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 83.426368][ T37] audit: type=1400 audit(1619614551.097:8): avc: denied { execmem } for pid=8391 comm="syz-executor175" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 83.437072][ T8391] ------------[ cut here ]------------ [ 83.453982][ T8391] Trying to write to read-only block-device nullb0 (partno 0) [ 83.463630][ T8391] WARNING: CPU: 0 PID: 8391 at block/blk-core.c:704 submit_bio_checks+0x165c/0x1aa0 [ 83.474025][ T8391] Modules linked in: [ 83.477951][ T8391] CPU: 0 PID: 8391 Comm: syz-executor175 Not tainted 5.12.0-syzkaller #0 [ 83.486723][ T8391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.496955][ T8391] RIP: 0010:submit_bio_checks+0x165c/0x1aa0 [ 83.503046][ T8391] 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 60 ae bf 89 48 89 c6 44 89 e2 e8 7c dc 10 05 <0f> 0b e9 36 f3 ff ff e8 a8 87 bf fd 0f 0b e9 bf f1 ff ff e8 9c 87 [ 83.523824][ T8391] RSP: 0018:ffffc90001aa7310 EFLAGS: 00010286 [ 83.530211][ T8391] RAX: 0000000000000000 RBX: ffff8880129ed168 RCX: 0000000000000000 [ 83.538255][ T8391] RDX: ffff88802839a380 RSI: ffffffff815b73d5 RDI: fffff52000354e54 [ 83.546467][ T8391] RBP: ffff8880145cda40 R08: 0000000000000000 R09: 0000000000000000 [ 83.554803][ T8391] R10: ffffffff815b013e R11: 0000000000000000 R12: 0000000000000000 [ 83.562884][ T8391] R13: ffff8880145cda50 R14: ffff88814419b3c0 R15: ffff8880129ed674 [ 83.570979][ T8391] FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 83.580009][ T8391] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 83.586723][ T8391] CR2: 0000000000480df8 CR3: 000000000bc8e000 CR4: 00000000001506f0 [ 83.594852][ T8391] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 83.602934][ T8391] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 83.611037][ T8391] Call Trace: [ 83.614339][ T8391] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 83.621367][ T8391] ? __lock_acquire+0xb3a/0x5230 [ 83.626392][ T8391] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 83.632776][ T8391] submit_bio_noacct+0x81/0xf20 [ 83.637661][ T8391] ? blk_queue_enter+0xb50/0xb50 [ 83.642831][ T8391] ? bio_associate_blkg_from_css+0x563/0xf60 [ 83.649356][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 83.654383][ T8391] submit_bio+0x263/0x5e0 [ 83.658868][ T8391] ? submit_bio_noacct+0xf20/0xf20 [ 83.664163][ T8391] ? bio_add_page+0x186/0x1f0 [ 83.669237][ T8391] ? __bio_try_merge_page+0x350/0x350 [ 83.674917][ T8391] submit_bh_wbc+0x5eb/0x7f0 [ 83.679615][ T8391] __block_write_full_page+0x86c/0x1340 [ 83.685185][ T8391] ? bdev_disk_changed+0x3c0/0x3c0 [ 83.690509][ T8391] block_write_full_page+0x14d/0x190 [ 83.696541][ T8391] ? bdev_disk_changed+0x3c0/0x3c0 [ 83.701738][ T8391] __writepage+0x60/0x180 [ 83.706088][ T8391] write_cache_pages+0x759/0x11a0 [ 83.711283][ T8391] ? tag_pages_for_writeback+0x450/0x450 [ 83.717039][ T8391] ? clear_page_dirty_for_io+0xa10/0xa10 [ 83.722791][ T8391] ? hlock_class+0x71/0x120 [ 83.727327][ T8391] ? lock_chain_count+0x20/0x20 [ 83.732520][ T8391] ? __lock_acquire+0x16a7/0x5230 [ 83.737701][ T8391] ? blkdev_readahead+0x20/0x20 [ 83.742655][ T8391] generic_writepages+0xe2/0x150 [ 83.747629][ T8391] ? write_cache_pages+0x11a0/0x11a0 [ 83.753105][ T8391] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 83.759982][ T8391] ? find_held_lock+0x2d/0x110 [ 83.766228][ T8391] do_writepages+0xec/0x290 [ 83.770919][ T8391] ? writeback_set_ratelimit+0x150/0x150 [ 83.776734][ T8391] ? do_raw_spin_lock+0x120/0x2b0 [ 83.782215][ T8391] ? do_raw_spin_unlock+0x171/0x230 [ 83.787456][ T8391] ? _raw_spin_unlock+0x24/0x40 [ 83.792459][ T8391] ? wbc_attach_and_unlock_inode+0x117/0x9e0 [ 83.798639][ T8391] __filemap_fdatawrite_range+0x2a5/0x390 [ 83.804428][ T8391] ? delete_from_page_cache_batch+0xe20/0xe20 [ 83.810628][ T8391] ? blkdev_put+0x86/0x580 [ 83.815276][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 83.820298][ T8391] filemap_write_and_wait_range+0xe1/0x1c0 [ 83.827709][ T8391] __blkdev_put+0x6b7/0x800 [ 83.832780][ T8391] ? __mutex_unlock_slowpath+0xe2/0x610 [ 83.838431][ T8391] ? freeze_bdev+0x250/0x250 [ 83.843064][ T8391] ? wait_for_completion_io+0x270/0x270 [ 83.848730][ T8391] ? _raw_spin_unlock+0x24/0x40 [ 83.853607][ T8391] ? locks_remove_file+0x312/0x560 [ 83.858798][ T8391] blkdev_put+0x92/0x580 [ 83.863091][ T8391] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 83.869551][ T8391] blkdev_close+0x8c/0xb0 [ 83.874109][ T8391] __fput+0x288/0x920 [ 83.881390][ T8391] ? blkdev_put+0x580/0x580 [ 83.886081][ T8391] task_work_run+0xdd/0x1a0 [ 83.890966][ T8391] do_exit+0xbfc/0x2a60 [ 83.895336][ T8391] ? mm_update_next_owner+0x7a0/0x7a0 [ 83.901052][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 83.906079][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 83.911296][ T8391] do_group_exit+0x125/0x310 [ 83.915924][ T8391] __x64_sys_exit_group+0x3a/0x50 [ 83.921107][ T8391] do_syscall_64+0x3a/0xb0 [ 83.925561][ T8391] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 83.931779][ T8391] RIP: 0033:0x43da99 [ 83.937349][ T8391] Code: Unable to access opcode bytes at RIP 0x43da6f. [ 83.945106][ T8391] RSP: 002b:00007ffc35558948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 83.953907][ T8391] RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da99 [ 83.962121][ T8391] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 83.970582][ T8391] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488 [ 83.978788][ T8391] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ae230 [ 83.986794][ T8391] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 83.996582][ T8391] Kernel panic - not syncing: panic_on_warn set ... [ 84.003370][ T8391] CPU: 0 PID: 8391 Comm: syz-executor175 Not tainted 5.12.0-syzkaller #0 [ 84.011985][ T8391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.022391][ T8391] Call Trace: [ 84.025761][ T8391] dump_stack+0x141/0x1d7 [ 84.030098][ T8391] panic+0x306/0x73d [ 84.034006][ T8391] ? __warn_printk+0xf3/0xf3 [ 84.038685][ T8391] ? __warn.cold+0x1a/0x44 [ 84.043113][ T8391] ? submit_bio_checks+0x165c/0x1aa0 [ 84.048426][ T8391] __warn.cold+0x35/0x44 [ 84.052792][ T8391] ? submit_bio_checks+0x165c/0x1aa0 [ 84.058274][ T8391] report_bug+0x1bd/0x210 [ 84.062651][ T8391] handle_bug+0x3c/0x60 [ 84.066836][ T8391] exc_invalid_op+0x14/0x40 [ 84.071627][ T8391] asm_exc_invalid_op+0x12/0x20 [ 84.076497][ T8391] RIP: 0010:submit_bio_checks+0x165c/0x1aa0 [ 84.082417][ T8391] 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 60 ae bf 89 48 89 c6 44 89 e2 e8 7c dc 10 05 <0f> 0b e9 36 f3 ff ff e8 a8 87 bf fd 0f 0b e9 bf f1 ff ff e8 9c 87 [ 84.102028][ T8391] RSP: 0018:ffffc90001aa7310 EFLAGS: 00010286 [ 84.108109][ T8391] RAX: 0000000000000000 RBX: ffff8880129ed168 RCX: 0000000000000000 [ 84.116100][ T8391] RDX: ffff88802839a380 RSI: ffffffff815b73d5 RDI: fffff52000354e54 [ 84.124119][ T8391] RBP: ffff8880145cda40 R08: 0000000000000000 R09: 0000000000000000 [ 84.132189][ T8391] R10: ffffffff815b013e R11: 0000000000000000 R12: 0000000000000000 [ 84.140431][ T8391] R13: ffff8880145cda50 R14: ffff88814419b3c0 R15: ffff8880129ed674 [ 84.148510][ T8391] ? wake_up_klogd.part.0+0x8e/0xd0 [ 84.154064][ T8391] ? vprintk_func+0x95/0x1e0 [ 84.158760][ T8391] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 84.165703][ T8391] ? __lock_acquire+0xb3a/0x5230 [ 84.170652][ T8391] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 84.176642][ T8391] submit_bio_noacct+0x81/0xf20 [ 84.181509][ T8391] ? blk_queue_enter+0xb50/0xb50 [ 84.186462][ T8391] ? bio_associate_blkg_from_css+0x563/0xf60 [ 84.192544][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 84.197395][ T8391] submit_bio+0x263/0x5e0 [ 84.201733][ T8391] ? submit_bio_noacct+0xf20/0xf20 [ 84.206854][ T8391] ? bio_add_page+0x186/0x1f0 [ 84.211621][ T8391] ? __bio_try_merge_page+0x350/0x350 [ 84.217048][ T8391] submit_bh_wbc+0x5eb/0x7f0 [ 84.221672][ T8391] __block_write_full_page+0x86c/0x1340 [ 84.227335][ T8391] ? bdev_disk_changed+0x3c0/0x3c0 [ 84.232476][ T8391] block_write_full_page+0x14d/0x190 [ 84.238011][ T8391] ? bdev_disk_changed+0x3c0/0x3c0 [ 84.243180][ T8391] __writepage+0x60/0x180 [ 84.247885][ T8391] write_cache_pages+0x759/0x11a0 [ 84.252913][ T8391] ? tag_pages_for_writeback+0x450/0x450 [ 84.258566][ T8391] ? clear_page_dirty_for_io+0xa10/0xa10 [ 84.264198][ T8391] ? hlock_class+0x71/0x120 [ 84.268702][ T8391] ? lock_chain_count+0x20/0x20 [ 84.273560][ T8391] ? __lock_acquire+0x16a7/0x5230 [ 84.278594][ T8391] ? blkdev_readahead+0x20/0x20 [ 84.284499][ T8391] generic_writepages+0xe2/0x150 [ 84.289442][ T8391] ? write_cache_pages+0x11a0/0x11a0 [ 84.294819][ T8391] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 84.300803][ T8391] ? find_held_lock+0x2d/0x110 [ 84.305563][ T8391] do_writepages+0xec/0x290 [ 84.310617][ T8391] ? writeback_set_ratelimit+0x150/0x150 [ 84.316334][ T8391] ? do_raw_spin_lock+0x120/0x2b0 [ 84.322274][ T8391] ? do_raw_spin_unlock+0x171/0x230 [ 84.327569][ T8391] ? _raw_spin_unlock+0x24/0x40 [ 84.332524][ T8391] ? wbc_attach_and_unlock_inode+0x117/0x9e0 [ 84.338511][ T8391] __filemap_fdatawrite_range+0x2a5/0x390 [ 84.344272][ T8391] ? delete_from_page_cache_batch+0xe20/0xe20 [ 84.350562][ T8391] ? blkdev_put+0x86/0x580 [ 84.355222][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 84.360185][ T8391] filemap_write_and_wait_range+0xe1/0x1c0 [ 84.366593][ T8391] __blkdev_put+0x6b7/0x800 [ 84.372072][ T8391] ? __mutex_unlock_slowpath+0xe2/0x610 [ 84.377802][ T8391] ? freeze_bdev+0x250/0x250 [ 84.382407][ T8391] ? wait_for_completion_io+0x270/0x270 [ 84.387994][ T8391] ? _raw_spin_unlock+0x24/0x40 [ 84.392946][ T8391] ? locks_remove_file+0x312/0x560 [ 84.398166][ T8391] blkdev_put+0x92/0x580 [ 84.402417][ T8391] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 84.408685][ T8391] blkdev_close+0x8c/0xb0 [ 84.413034][ T8391] __fput+0x288/0x920 [ 84.417024][ T8391] ? blkdev_put+0x580/0x580 [ 84.421601][ T8391] task_work_run+0xdd/0x1a0 [ 84.426232][ T8391] do_exit+0xbfc/0x2a60 [ 84.430803][ T8391] ? mm_update_next_owner+0x7a0/0x7a0 [ 84.436433][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 84.441401][ T8391] ? lock_downgrade+0x6e0/0x6e0 [ 84.446275][ T8391] do_group_exit+0x125/0x310 [ 84.450884][ T8391] __x64_sys_exit_group+0x3a/0x50 [ 84.455921][ T8391] do_syscall_64+0x3a/0xb0 [ 84.460332][ T8391] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 84.466248][ T8391] RIP: 0033:0x43da99 [ 84.470252][ T8391] Code: Unable to access opcode bytes at RIP 0x43da6f. [ 84.477458][ T8391] RSP: 002b:00007ffc35558948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 84.486112][ T8391] RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da99 [ 84.494196][ T8391] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 84.503053][ T8391] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488 [ 84.511735][ T8391] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ae230 [ 84.519726][ T8391] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 84.528395][ T8391] Kernel Offset: disabled [ 84.532936][ T8391] Rebooting in 86400 seconds..