[ 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... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.3' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 61.022301][ T6852] BTRFS: device fsid 815caf9a-dc43-4d2a-ac54-764b8333d765 devid 1 transid 5 /dev/loop0 scanned by syz-executor033 (6852) [ 61.042901][ T6852] BTRFS info (device loop0): disk space caching is enabled [ 61.050260][ T6852] BTRFS info (device loop0): has skinny extents [ 61.069452][ T26] detected buffer overflow in memcpy [ 61.075073][ T26] ------------[ cut here ]------------ [ 61.081689][ T26] kernel BUG at lib/string.c:1129! [ 61.086820][ T26] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 61.092886][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Not tainted 5.9.0-rc4-syzkaller #0 [ 61.101101][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.111163][ T26] Workqueue: btrfs-endio-meta btrfs_work_helper [ 61.117405][ T26] RIP: 0010:fortify_panic+0xf/0x20 [ 61.122497][ T26] Code: 89 c7 48 89 74 24 08 48 89 04 24 e8 ab 39 00 fe 48 8b 74 24 08 48 8b 04 24 eb d5 48 89 fe 48 c7 c7 40 22 97 88 e8 b0 8c a9 fd <0f> 0b cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 [ 61.142096][ T26] RSP: 0018:ffffc90000e27980 EFLAGS: 00010286 [ 61.148141][ T26] RAX: 0000000000000022 RBX: ffff8880a80dca64 RCX: 0000000000000000 [ 61.156098][ T26] RDX: ffff8880a90860c0 RSI: ffffffff815dba07 RDI: fffff520001c4f22 [ 61.164051][ T26] RBP: ffff8880a80dca00 R08: 0000000000000022 R09: ffff8880ae7318e7 [ 61.172021][ T26] R10: 0000000000000000 R11: 0000000000077578 R12: 00000000ffffff6e [ 61.179985][ T26] R13: 0000000000000008 R14: ffffc90000e27a40 R15: 1ffff920001c4f3c [ 61.187940][ T26] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 61.196858][ T26] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.203419][ T26] CR2: 0000557335f440d0 CR3: 000000009647d000 CR4: 00000000001506e0 [ 61.211385][ T26] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.219342][ T26] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.227304][ T26] Call Trace: [ 61.230594][ T26] btree_readpage_end_io_hook.cold+0x206/0x221 [ 61.236733][ T26] ? btrfs_set_buffer_lockdep_class+0x170/0x170 [ 61.242960][ T26] ? add_lock_to_list.constprop.0+0x148/0x480 [ 61.249010][ T26] end_bio_extent_readpage+0x4de/0x10c0 [ 61.254544][ T26] ? btrfs_submit_read_repair+0x1360/0x1360 [ 61.260507][ T26] ? iolatency_pd_stat+0x570/0x570 [ 61.265599][ T26] ? btrfs_submit_read_repair+0x1360/0x1360 [ 61.271483][ T26] bio_endio+0x3cf/0x7f0 [ 61.275705][ T26] ? btrfs_submit_read_repair+0x1360/0x1360 [ 61.281591][ T26] end_workqueue_fn+0x114/0x170 [ 61.286421][ T26] btrfs_work_helper+0x221/0xe20 [ 61.291335][ T26] ? _raw_spin_unlock_irq+0x1f/0x80 [ 61.296510][ T26] process_one_work+0x94c/0x1670 [ 61.301425][ T26] ? lock_release+0x8f0/0x8f0 [ 61.306081][ T26] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 61.311434][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.316363][ T26] ? lockdep_hardirqs_off+0x96/0xd0 [ 61.321547][ T26] worker_thread+0x64c/0x1120 [ 61.326221][ T26] ? process_one_work+0x1670/0x1670 [ 61.331402][ T26] kthread+0x3b5/0x4a0 [ 61.335464][ T26] ? __kthread_bind_mask+0xc0/0xc0 [ 61.340554][ T26] ret_from_fork+0x1f/0x30 [ 61.344955][ T26] Modules linked in: [ 61.358276][ T26] ---[ end trace b68924293169feef ]--- [ 61.363837][ T26] RIP: 0010:fortify_panic+0xf/0x20 [ 61.368956][ T26] Code: 89 c7 48 89 74 24 08 48 89 04 24 e8 ab 39 00 fe 48 8b 74 24 08 48 8b 04 24 eb d5 48 89 fe 48 c7 c7 40 22 97 88 e8 b0 8c a9 fd <0f> 0b cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 [ 61.389572][ T26] RSP: 0018:ffffc90000e27980 EFLAGS: 00010286 [ 61.396044][ T26] RAX: 0000000000000022 RBX: ffff8880a80dca64 RCX: 0000000000000000 [ 61.404828][ T26] RDX: ffff8880a90860c0 RSI: ffffffff815dba07 RDI: fffff520001c4f22 [ 61.413272][ T26] RBP: ffff8880a80dca00 R08: 0000000000000022 R09: ffff8880ae7318e7 [ 61.421737][ T26] R10: 0000000000000000 R11: 0000000000077578 R12: 00000000ffffff6e [ 61.429720][ T26] R13: 0000000000000008 R14: ffffc90000e27a40 R15: 1ffff920001c4f3c [ 61.438428][ T26] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 61.448213][ T26] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.455247][ T26] CR2: 00007f95b7c4d008 CR3: 000000009647d000 CR4: 00000000001506e0 [ 61.464187][ T26] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.472656][ T26] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.481095][ T26] Kernel panic - not syncing: Fatal exception [ 61.488322][ T26] Kernel Offset: disabled [ 61.492641][ T26] Rebooting in 86400 seconds..