[ 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 Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 78.700504][ T37] audit: type=1400 audit(1629729867.587:8): avc: denied { execmem } for pid=8454 comm="syz-executor946" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 78.721827][ T8454] ------------[ cut here ]------------ [ 78.728431][ T8454] Trying to write to read-only block-device nullb0 (partno 0) [ 78.737365][ T8454] WARNING: CPU: 0 PID: 8454 at block/blk-core.c:700 submit_bio_checks+0x160c/0x1a80 [ 78.747756][ T8454] Modules linked in: [ 78.751923][ T8454] CPU: 0 PID: 8454 Comm: syz-executor946 Not tainted 5.14.0-rc7-syzkaller #0 [ 78.760945][ T8454] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.771421][ T8454] RIP: 0010:submit_bio_checks+0x160c/0x1a80 [ 78.777527][ T8454] Code: 00 00 45 0f b6 a4 24 90 05 00 00 48 8d 74 24 60 48 89 ef e8 c6 47 fe ff 48 c7 c7 40 17 e1 89 48 89 c6 44 89 e2 e8 bc 26 28 05 <0f> 0b e9 86 f3 ff ff e8 f8 a9 b4 fd e8 53 78 6a 05 31 ff 89 c3 89 [ 78.797868][ T8454] RSP: 0018:ffffc90001d57488 EFLAGS: 00010282 [ 78.804095][ T8454] RAX: 0000000000000000 RBX: ffff88801f9a7100 RCX: 0000000000000000 [ 78.812314][ T8454] RDX: ffff8880242401c0 RSI: ffffffff815cb9a5 RDI: fffff520003aae83 [ 78.820493][ T8454] RBP: ffff88802a03ba40 R08: 0000000000000000 R09: 0000000000000000 [ 78.828549][ T8454] R10: ffffffff815c57ae R11: 0000000000000000 R12: 0000000000000000 [ 78.836611][ T8454] R13: ffff88802a03ba50 R14: ffff88801afff400 R15: ffff88801f9a7674 [ 78.844851][ T8454] FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 78.853792][ T8454] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 78.860559][ T8454] CR2: 0000000000480db8 CR3: 000000000b68e000 CR4: 00000000001506e0 [ 78.868909][ T8454] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 78.877051][ T8454] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 78.885750][ T8454] Call Trace: [ 78.889209][ T8454] ? __lock_acquire+0xbc2/0x54a0 [ 78.894245][ T8454] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 78.901234][ T8454] submit_bio_noacct+0x81/0xf20 [ 78.906167][ T8454] ? blk_queue_enter+0xb60/0xb60 [ 78.911136][ T8454] ? lock_downgrade+0x6e0/0x6e0 [ 78.916184][ T8454] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 78.922536][ T8454] ? __bio_add_page+0x377/0x540 [ 78.927474][ T8454] submit_bio+0x1ea/0x470 [ 78.931836][ T8454] ? submit_bio_noacct+0xf20/0xf20 [ 78.937168][ T8454] submit_bh_wbc+0x5eb/0x7f0 [ 78.941773][ T8454] __block_write_full_page+0x879/0x1360 [ 78.947481][ T8454] ? bdev_evict_inode+0x4a0/0x4a0 [ 78.952518][ T8454] block_write_full_page+0x14d/0x190 [ 78.957975][ T8454] ? bdev_evict_inode+0x4a0/0x4a0 [ 78.963094][ T8454] __writepage+0x60/0x180 [ 78.967530][ T8454] write_cache_pages+0x754/0x1190 [ 78.972741][ T8454] ? tag_pages_for_writeback+0x440/0x440 [ 78.978481][ T8454] ? clear_page_dirty_for_io+0xa40/0xa40 [ 78.984199][ T8454] ? mark_lock+0xef/0x17b0 [ 78.988817][ T8454] ? __lock_acquire+0x162f/0x54a0 [ 78.994631][ T8454] ? blkdev_readahead+0x20/0x20 [ 78.999490][ T8454] generic_writepages+0xe2/0x150 [ 79.004489][ T8454] ? write_cache_pages+0x1190/0x1190 [ 79.009802][ T8454] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 79.015945][ T8454] ? find_held_lock+0x2d/0x110 [ 79.020727][ T8454] do_writepages+0xec/0x290 [ 79.025295][ T8454] ? writeback_set_ratelimit+0x150/0x150 [ 79.030934][ T8454] ? do_raw_spin_lock+0x120/0x2b0 [ 79.036054][ T8454] ? do_raw_spin_unlock+0x171/0x230 [ 79.041404][ T8454] ? _raw_spin_unlock+0x24/0x40 [ 79.046352][ T8454] ? wbc_attach_and_unlock_inode+0x111/0x9d0 [ 79.052351][ T8454] __filemap_fdatawrite_range+0x2a5/0x390 [ 79.058194][ T8454] ? delete_from_page_cache_batch+0xe10/0xe10 [ 79.064547][ T8454] ? locks_remove_file+0x2f4/0x570 [ 79.069765][ T8454] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 79.076106][ T8454] ? do_raw_spin_unlock+0x171/0x230 [ 79.081340][ T8454] filemap_write_and_wait_range+0x65/0x100 [ 79.087225][ T8454] blkdev_put+0x7ff/0xae0 [ 79.091569][ T8454] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 79.097896][ T8454] blkdev_close+0x8c/0xb0 [ 79.102347][ T8454] __fput+0x288/0x920 [ 79.106397][ T8454] ? blkdev_put+0xae0/0xae0 [ 79.110912][ T8454] task_work_run+0xdd/0x1a0 [ 79.115511][ T8454] do_exit+0xbd4/0x2a60 [ 79.119672][ T8454] ? __context_tracking_exit+0xb8/0xe0 [ 79.125203][ T8454] ? lock_downgrade+0x6e0/0x6e0 [ 79.130079][ T8454] ? lock_downgrade+0x6e0/0x6e0 [ 79.135028][ T8454] ? mm_update_next_owner+0x7a0/0x7a0 [ 79.140402][ T8454] do_group_exit+0x125/0x310 [ 79.145055][ T8454] __x64_sys_exit_group+0x3a/0x50 [ 79.150088][ T8454] do_syscall_64+0x35/0xb0 [ 79.154599][ T8454] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 79.160509][ T8454] RIP: 0033:0x43da59 [ 79.164454][ T8454] Code: Unable to access opcode bytes at RIP 0x43da2f. [ 79.171304][ T8454] RSP: 002b:00007ffe31586f28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 79.179814][ T8454] RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da59 [ 79.187944][ T8454] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 79.196347][ T8454] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 79.204517][ T8454] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000004ae230 [ 79.212581][ T8454] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 79.222223][ T8454] Kernel panic - not syncing: panic_on_warn set ... [ 79.228813][ T8454] CPU: 0 PID: 8454 Comm: syz-executor946 Not tainted 5.14.0-rc7-syzkaller #0 [ 79.237555][ T8454] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.247680][ T8454] Call Trace: [ 79.251055][ T8454] dump_stack_lvl+0xcd/0x134 [ 79.255739][ T8454] panic+0x306/0x73d [ 79.259617][ T8454] ? __warn_printk+0xf3/0xf3 [ 79.264189][ T8454] ? __warn.cold+0x1a/0x44 [ 79.268582][ T8454] ? submit_bio_checks+0x160c/0x1a80 [ 79.273876][ T8454] __warn.cold+0x35/0x44 [ 79.278100][ T8454] ? wake_up_klogd.part.0+0x8e/0xd0 [ 79.283302][ T8454] ? submit_bio_checks+0x160c/0x1a80 [ 79.288573][ T8454] report_bug+0x1bd/0x210 [ 79.292974][ T8454] handle_bug+0x3c/0x60 [ 79.297113][ T8454] exc_invalid_op+0x14/0x40 [ 79.301599][ T8454] asm_exc_invalid_op+0x12/0x20 [ 79.306434][ T8454] RIP: 0010:submit_bio_checks+0x160c/0x1a80 [ 79.312319][ T8454] Code: 00 00 45 0f b6 a4 24 90 05 00 00 48 8d 74 24 60 48 89 ef e8 c6 47 fe ff 48 c7 c7 40 17 e1 89 48 89 c6 44 89 e2 e8 bc 26 28 05 <0f> 0b e9 86 f3 ff ff e8 f8 a9 b4 fd e8 53 78 6a 05 31 ff 89 c3 89 [ 79.332017][ T8454] RSP: 0018:ffffc90001d57488 EFLAGS: 00010282 [ 79.338084][ T8454] RAX: 0000000000000000 RBX: ffff88801f9a7100 RCX: 0000000000000000 [ 79.346055][ T8454] RDX: ffff8880242401c0 RSI: ffffffff815cb9a5 RDI: fffff520003aae83 [ 79.354283][ T8454] RBP: ffff88802a03ba40 R08: 0000000000000000 R09: 0000000000000000 [ 79.362255][ T8454] R10: ffffffff815c57ae R11: 0000000000000000 R12: 0000000000000000 [ 79.370219][ T8454] R13: ffff88802a03ba50 R14: ffff88801afff400 R15: ffff88801f9a7674 [ 79.378182][ T8454] ? wake_up_klogd.part.0+0x8e/0xd0 [ 79.383370][ T8454] ? vprintk+0x95/0x260 [ 79.387525][ T8454] ? submit_bio_checks+0x160c/0x1a80 [ 79.392797][ T8454] ? __lock_acquire+0xbc2/0x54a0 [ 79.397730][ T8454] ? trace_event_raw_event_block_rq_requeue+0x510/0x510 [ 79.404848][ T8454] submit_bio_noacct+0x81/0xf20 [ 79.409727][ T8454] ? blk_queue_enter+0xb60/0xb60 [ 79.414672][ T8454] ? lock_downgrade+0x6e0/0x6e0 [ 79.419537][ T8454] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 79.427165][ T8454] ? __bio_add_page+0x377/0x540 [ 79.432289][ T8454] submit_bio+0x1ea/0x470 [ 79.436782][ T8454] ? submit_bio_noacct+0xf20/0xf20 [ 79.441978][ T8454] submit_bh_wbc+0x5eb/0x7f0 [ 79.446569][ T8454] __block_write_full_page+0x879/0x1360 [ 79.452128][ T8454] ? bdev_evict_inode+0x4a0/0x4a0 [ 79.457149][ T8454] block_write_full_page+0x14d/0x190 [ 79.462858][ T8454] ? bdev_evict_inode+0x4a0/0x4a0 [ 79.467873][ T8454] __writepage+0x60/0x180 [ 79.472190][ T8454] write_cache_pages+0x754/0x1190 [ 79.477199][ T8454] ? tag_pages_for_writeback+0x440/0x440 [ 79.482893][ T8454] ? clear_page_dirty_for_io+0xa40/0xa40 [ 79.488535][ T8454] ? mark_lock+0xef/0x17b0 [ 79.492951][ T8454] ? __lock_acquire+0x162f/0x54a0 [ 79.497995][ T8454] ? blkdev_readahead+0x20/0x20 [ 79.502871][ T8454] generic_writepages+0xe2/0x150 [ 79.507822][ T8454] ? write_cache_pages+0x1190/0x1190 [ 79.513190][ T8454] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 79.519179][ T8454] ? find_held_lock+0x2d/0x110 [ 79.523950][ T8454] do_writepages+0xec/0x290 [ 79.528478][ T8454] ? writeback_set_ratelimit+0x150/0x150 [ 79.534783][ T8454] ? do_raw_spin_lock+0x120/0x2b0 [ 79.540074][ T8454] ? do_raw_spin_unlock+0x171/0x230 [ 79.545278][ T8454] ? _raw_spin_unlock+0x24/0x40 [ 79.550465][ T8454] ? wbc_attach_and_unlock_inode+0x111/0x9d0 [ 79.556660][ T8454] __filemap_fdatawrite_range+0x2a5/0x390 [ 79.562591][ T8454] ? delete_from_page_cache_batch+0xe10/0xe10 [ 79.568704][ T8454] ? locks_remove_file+0x2f4/0x570 [ 79.573919][ T8454] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 79.580154][ T8454] ? do_raw_spin_unlock+0x171/0x230 [ 79.585346][ T8454] filemap_write_and_wait_range+0x65/0x100 [ 79.591152][ T8454] blkdev_put+0x7ff/0xae0 [ 79.595476][ T8454] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 79.601707][ T8454] blkdev_close+0x8c/0xb0 [ 79.606021][ T8454] __fput+0x288/0x920 [ 79.610079][ T8454] ? blkdev_put+0xae0/0xae0 [ 79.614565][ T8454] task_work_run+0xdd/0x1a0 [ 79.619143][ T8454] do_exit+0xbd4/0x2a60 [ 79.623299][ T8454] ? __context_tracking_exit+0xb8/0xe0 [ 79.628739][ T8454] ? lock_downgrade+0x6e0/0x6e0 [ 79.633573][ T8454] ? lock_downgrade+0x6e0/0x6e0 [ 79.638684][ T8454] ? mm_update_next_owner+0x7a0/0x7a0 [ 79.644130][ T8454] do_group_exit+0x125/0x310 [ 79.648706][ T8454] __x64_sys_exit_group+0x3a/0x50 [ 79.653732][ T8454] do_syscall_64+0x35/0xb0 [ 79.658181][ T8454] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 79.664081][ T8454] RIP: 0033:0x43da59 [ 79.668217][ T8454] Code: Unable to access opcode bytes at RIP 0x43da2f. [ 79.675047][ T8454] RSP: 002b:00007ffe31586f28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 79.683542][ T8454] RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da59 [ 79.691678][ T8454] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 79.699746][ T8454] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 79.707718][ T8454] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000004ae230 [ 79.715772][ T8454] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 79.725490][ T8454] Kernel Offset: disabled [ 79.730009][ T8454] Rebooting in 86400 seconds..