[ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.84' (ECDSA) to the list of known hosts. 2020/12/27 11:23:24 fuzzer started syzkaller login: [ 53.103830][ T8482] ================================================================================ [ 53.113559][ T8482] UBSAN: invalid-load in kernel/params.c:302:33 [ 53.119986][ T8482] load of value 255 is not a valid value for type '_Bool' [ 53.127447][ T8482] CPU: 1 PID: 8482 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 53.135424][ T8482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.145545][ T8482] Call Trace: [ 53.149120][ T8482] dump_stack+0x107/0x163 [ 53.153454][ T8482] ubsan_epilogue+0xb/0x5a [ 53.157992][ T8482] __ubsan_handle_load_invalid_value.cold+0x62/0x6c [ 53.164565][ T8482] param_get_bool.cold+0x14/0x19 [ 53.169482][ T8482] param_attr_show+0x14a/0x220 [ 53.174233][ T8482] ? kernel_param_unlock+0x40/0x40 [ 53.179377][ T8482] module_attr_show+0x48/0x70 [ 53.184037][ T8482] ? func_ptr_is_kernel_text+0x80/0x80 [ 53.189476][ T8482] sysfs_kf_seq_show+0x1f8/0x400 [ 53.194393][ T8482] seq_read_iter+0x4d3/0x1220 [ 53.199059][ T8482] seq_read+0x3dd/0x5b0 [ 53.203286][ T8482] ? seq_read_iter+0x1220/0x1220 [ 53.208264][ T8482] ? lock_downgrade+0x6d0/0x6d0 [ 53.213358][ T8482] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 53.219585][ T8482] kernfs_fop_read+0xe9/0x590 [ 53.224392][ T8482] ? rw_verify_area+0x11d/0x350 [ 53.229221][ T8482] ? kernfs_vma_page_mkwrite+0x230/0x230 [ 53.235019][ T8482] vfs_read+0x1b5/0x570 [ 53.239155][ T8482] ksys_read+0x12d/0x250 [ 53.243375][ T8482] ? vfs_write+0xa80/0xa80 [ 53.247771][ T8482] ? syscall_enter_from_user_mode+0x1d/0x50 [ 53.253646][ T8482] do_syscall_64+0x2d/0x70 [ 53.258043][ T8482] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.263916][ T8482] RIP: 0033:0x4b117b [ 53.267789][ T8482] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 9b c2 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 53.287459][ T8482] RSP: 002b:000000c0000b7738 EFLAGS: 00000216 ORIG_RAX: 0000000000000000 [ 53.296022][ T8482] RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b117b [ 53.303973][ T8482] RDX: 0000000000001200 RSI: 000000c0001bec00 RDI: 0000000000000006 [ 53.311923][ T8482] RBP: 000000c0000b7788 R08: 0000000000000001 R09: 0000000000000002 [ 53.320044][ T8482] R10: 0000000000001200 R11: 0000000000000216 R12: ffffffffffffffff [ 53.328079][ T8482] R13: 0000000000000005 R14: 0000000000000004 R15: 0000000000000005 [ 53.336220][ T8482] ================================================================================ [ 53.345708][ T8482] Kernel panic - not syncing: panic_on_warn set ... [ 53.352277][ T8482] CPU: 1 PID: 8482 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 53.360228][ T8482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.370256][ T8482] Call Trace: [ 53.373514][ T8482] dump_stack+0x107/0x163 [ 53.377828][ T8482] panic+0x343/0x77f [ 53.381698][ T8482] ? __warn_printk+0xf3/0xf3 [ 53.386270][ T8482] ? ubsan_epilogue+0x3e/0x5a [ 53.390927][ T8482] ubsan_epilogue+0x54/0x5a [ 53.395405][ T8482] __ubsan_handle_load_invalid_value.cold+0x62/0x6c [ 53.401977][ T8482] param_get_bool.cold+0x14/0x19 [ 53.406895][ T8482] param_attr_show+0x14a/0x220 [ 53.411637][ T8482] ? kernel_param_unlock+0x40/0x40 [ 53.416730][ T8482] module_attr_show+0x48/0x70 [ 53.421385][ T8482] ? func_ptr_is_kernel_text+0x80/0x80 [ 53.426821][ T8482] sysfs_kf_seq_show+0x1f8/0x400 [ 53.431737][ T8482] seq_read_iter+0x4d3/0x1220 [ 53.436403][ T8482] seq_read+0x3dd/0x5b0 [ 53.440536][ T8482] ? seq_read_iter+0x1220/0x1220 [ 53.445542][ T8482] ? lock_downgrade+0x6d0/0x6d0 [ 53.450373][ T8482] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 53.456771][ T8482] kernfs_fop_read+0xe9/0x590 [ 53.461430][ T8482] ? rw_verify_area+0x11d/0x350 [ 53.466272][ T8482] ? kernfs_vma_page_mkwrite+0x230/0x230 [ 53.471883][ T8482] vfs_read+0x1b5/0x570 [ 53.476032][ T8482] ksys_read+0x12d/0x250 [ 53.480263][ T8482] ? vfs_write+0xa80/0xa80 [ 53.484658][ T8482] ? syscall_enter_from_user_mode+0x1d/0x50 [ 53.490537][ T8482] do_syscall_64+0x2d/0x70 [ 53.495014][ T8482] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.500901][ T8482] RIP: 0033:0x4b117b [ 53.504776][ T8482] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 9b c2 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 53.524367][ T8482] RSP: 002b:000000c0000b7738 EFLAGS: 00000216 ORIG_RAX: 0000000000000000 [ 53.532931][ T8482] RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b117b [ 53.540893][ T8482] RDX: 0000000000001200 RSI: 000000c0001bec00 RDI: 0000000000000006 [ 53.548839][ T8482] RBP: 000000c0000b7788 R08: 0000000000000001 R09: 0000000000000002 [ 53.556787][ T8482] R10: 0000000000001200 R11: 0000000000000216 R12: ffffffffffffffff [ 53.564825][ T8482] R13: 0000000000000005 R14: 0000000000000004 R15: 0000000000000005 [ 53.576482][ T8482] Kernel Offset: disabled [ 53.580866][ T8482] Rebooting in 86400 seconds..