[ 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 '10.128.0.43' (ECDSA) to the list of known hosts. syzkaller login: [ 32.309204] IPVS: ftp: loaded support on port[0] = 21 executing program [ 32.389183] UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000) [ 32.416385] ------------[ cut here ]------------ [ 32.421205] VFS: brelse: Trying to free free buffer [ 32.426304] WARNING: CPU: 1 PID: 8076 at fs/buffer.c:1144 __brelse+0x67/0xa0 [ 32.433470] Kernel panic - not syncing: panic_on_warn set ... [ 32.433470] [ 32.440813] CPU: 1 PID: 8076 Comm: syz-executor213 Not tainted 4.19.211-syzkaller #0 [ 32.448669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 32.457996] Call Trace: [ 32.460562] dump_stack+0x1fc/0x2ef [ 32.464171] panic+0x26a/0x50e [ 32.467438] ? __warn_printk+0xf3/0xf3 [ 32.471305] ? __brelse+0x67/0xa0 [ 32.474741] ? __probe_kernel_read+0x130/0x1b0 [ 32.479300] ? __warn.cold+0x5/0x5a [ 32.482902] ? __warn+0xe4/0x200 [ 32.486253] ? __brelse+0x67/0xa0 [ 32.489686] __warn.cold+0x20/0x5a [ 32.493203] ? __brelse+0x67/0xa0 [ 32.496634] report_bug+0x262/0x2b0 [ 32.500244] do_error_trap+0x1d7/0x310 [ 32.504109] ? math_error+0x310/0x310 [ 32.507886] ? irq_work_claim+0xa6/0xc0 [ 32.511839] ? irq_work_queue+0x29/0x80 [ 32.515792] ? error_entry+0x72/0xd0 [ 32.519486] ? trace_hardirqs_off_caller+0x2c/0x210 [ 32.524483] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.529308] invalid_op+0x14/0x20 [ 32.532740] RIP: 0010:__brelse+0x67/0xa0 [ 32.536782] Code: 7c 04 84 d2 75 4e 44 8b 63 60 31 ff 44 89 e6 e8 bf 16 b2 ff 45 85 e4 75 1c e8 45 15 b2 ff 48 c7 c7 e0 1c 75 88 e8 1e 4d 42 06 <0f> 0b 5b 5d 41 5c e9 2e 15 b2 ff e8 29 15 b2 ff be 04 00 00 00 48 [ 32.555661] RSP: 0018:ffff8880b2f67a38 EFLAGS: 00010086 [ 32.561002] RAX: 0000000000000000 RBX: ffff88808b07dc78 RCX: 0000000000000000 [ 32.568250] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10165ecf39 [ 32.575507] RBP: ffff88808b07dcd8 R08: 0000000000000001 R09: 0000000000000000 [ 32.582752] R10: 0000000000000005 R11: ffffffff8c66505b R12: 0000000000000000 [ 32.590001] R13: dffffc0000000000 R14: ffff8880ba1287e0 R15: ffffffff81b08270 [ 32.597372] ? __find_get_block+0xde0/0xde0 [ 32.601675] ? vprintk_func+0x81/0x180 [ 32.605594] ? __brelse+0x67/0xa0 [ 32.609027] invalidate_bh_lru+0x90/0x140 [ 32.613152] ? __find_get_block+0xde0/0xde0 [ 32.617462] on_each_cpu_mask+0xf7/0x240 [ 32.621500] ? touch_buffer+0x2f0/0x2f0 [ 32.625537] on_each_cpu_cond+0x12d/0x1c0 [ 32.629661] ? on_each_cpu_mask+0x240/0x240 [ 32.633961] ? lock_downgrade+0x720/0x720 [ 32.638086] ? blkdev_put+0x30/0x520 [ 32.641781] __blkdev_put+0x29e/0x870 [ 32.645564] ? fsync_bdev+0xc0/0xc0 [ 32.649171] ? blkdev_put+0x85/0x520 [ 32.652876] deactivate_locked_super+0x94/0x160 [ 32.657522] deactivate_super+0x174/0x1a0 [ 32.661654] ? deactivate_locked_super+0x160/0x160 [ 32.666563] ? dput+0x31/0x640 [ 32.669737] cleanup_mnt+0x1a8/0x290 [ 32.673433] task_work_run+0x148/0x1c0 [ 32.677304] do_exit+0xbf3/0x2be0 [ 32.680739] ? lock_downgrade+0x720/0x720 [ 32.684864] ? mm_update_next_owner+0x650/0x650 [ 32.689517] ? up_read+0x17/0x110 [ 32.692952] ? __do_page_fault+0x180/0xd60 [ 32.697165] do_group_exit+0x125/0x310 [ 32.701032] __x64_sys_exit_group+0x3a/0x50 [ 32.705331] do_syscall_64+0xf9/0x620 [ 32.709112] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.714281] RIP: 0033:0x7ff8e26e1889 [ 32.717974] Code: Bad RIP value. [ 32.721315] RSP: 002b:00007ffe9080a5c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.728999] RAX: ffffffffffffffda RBX: 00007ff8e2758330 RCX: 00007ff8e26e1889 [ 32.736244] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 32.743491] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007ff8e2752e40 [ 32.750735] R10: 00007ff8e2752e40 R11: 0000000000000246 R12: 00007ff8e2758330 [ 32.757982] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 32.765473] Kernel Offset: disabled [ 32.769130] Rebooting in 86400 seconds..