[ 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 '10.128.1.1' (ECDSA) to the list of known hosts. 2020/12/27 12:08:48 fuzzer started syzkaller login: [ 55.348154][ T8468] ================================================================================ [ 55.357805][ T8468] UBSAN: invalid-load in kernel/params.c:302:33 [ 55.364029][ T8468] load of value 255 is not a valid value for type '_Bool' [ 55.371788][ T8468] CPU: 0 PID: 8468 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 55.379764][ T8468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.389811][ T8468] Call Trace: [ 55.393086][ T8468] dump_stack+0x107/0x163 [ 55.397427][ T8468] ubsan_epilogue+0xb/0x5a [ 55.401844][ T8468] __ubsan_handle_load_invalid_value.cold+0x62/0x6c [ 55.408417][ T8468] param_get_bool.cold+0x14/0x19 [ 55.413340][ T8468] param_attr_show+0x14a/0x220 [ 55.418086][ T8468] ? kernel_param_unlock+0x40/0x40 [ 55.423180][ T8468] module_attr_show+0x48/0x70 [ 55.427840][ T8468] ? func_ptr_is_kernel_text+0x80/0x80 [ 55.433398][ T8468] sysfs_kf_seq_show+0x1f8/0x400 [ 55.438784][ T8468] seq_read_iter+0x4d3/0x1220 [ 55.443670][ T8468] seq_read+0x3dd/0x5b0 [ 55.447810][ T8468] ? seq_read_iter+0x1220/0x1220 [ 55.452800][ T8468] ? lock_downgrade+0x6d0/0x6d0 [ 55.457636][ T8468] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 55.464039][ T8468] kernfs_fop_read+0xe9/0x590 [ 55.468800][ T8468] ? rw_verify_area+0x11d/0x350 [ 55.473649][ T8468] ? kernfs_vma_page_mkwrite+0x230/0x230 [ 55.479281][ T8468] vfs_read+0x1b5/0x570 [ 55.483423][ T8468] ksys_read+0x12d/0x250 [ 55.487643][ T8468] ? vfs_write+0xa80/0xa80 [ 55.492041][ T8468] ? syscall_enter_from_user_mode+0x1d/0x50 [ 55.497921][ T8468] do_syscall_64+0x2d/0x70 [ 55.502344][ T8468] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.508222][ T8468] RIP: 0033:0x4b117b [ 55.512096][ T8468] 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 [ 55.531687][ T8468] RSP: 002b:000000c0003f5738 EFLAGS: 00000216 ORIG_RAX: 0000000000000000 [ 55.540094][ T8468] RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b117b [ 55.548062][ T8468] RDX: 0000000000001200 RSI: 000000c000425300 RDI: 0000000000000006 [ 55.556012][ T8468] RBP: 000000c0003f5788 R08: 0000000000000001 R09: 0000000000000002 [ 55.563960][ T8468] R10: 0000000000001200 R11: 0000000000000216 R12: ffffffffffffffff [ 55.571907][ T8468] R13: 0000000000000002 R14: 0000000000000001 R15: 0000000000000005 [ 55.580290][ T8468] ================================================================================ [ 55.589709][ T8468] Kernel panic - not syncing: panic_on_warn set ... [ 55.596273][ T8468] CPU: 0 PID: 8468 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 55.604248][ T8468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.614553][ T8468] Call Trace: [ 55.617923][ T8468] dump_stack+0x107/0x163 [ 55.622241][ T8468] panic+0x343/0x77f [ 55.626378][ T8468] ? __warn_printk+0xf3/0xf3 [ 55.631125][ T8468] ? ubsan_epilogue+0x3e/0x5a [ 55.635787][ T8468] ubsan_epilogue+0x54/0x5a [ 55.640532][ T8468] __ubsan_handle_load_invalid_value.cold+0x62/0x6c [ 55.647108][ T8468] param_get_bool.cold+0x14/0x19 [ 55.652029][ T8468] param_attr_show+0x14a/0x220 [ 55.656776][ T8468] ? kernel_param_unlock+0x40/0x40 [ 55.661869][ T8468] module_attr_show+0x48/0x70 [ 55.666725][ T8468] ? func_ptr_is_kernel_text+0x80/0x80 [ 55.672252][ T8468] sysfs_kf_seq_show+0x1f8/0x400 [ 55.677363][ T8468] seq_read_iter+0x4d3/0x1220 [ 55.682033][ T8468] seq_read+0x3dd/0x5b0 [ 55.686169][ T8468] ? seq_read_iter+0x1220/0x1220 [ 55.691094][ T8468] ? lock_downgrade+0x6d0/0x6d0 [ 55.695932][ T8468] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 55.702341][ T8468] kernfs_fop_read+0xe9/0x590 [ 55.707018][ T8468] ? rw_verify_area+0x11d/0x350 [ 55.711847][ T8468] ? kernfs_vma_page_mkwrite+0x230/0x230 [ 55.717460][ T8468] vfs_read+0x1b5/0x570 [ 55.721599][ T8468] ksys_read+0x12d/0x250 [ 55.725821][ T8468] ? vfs_write+0xa80/0xa80 [ 55.730219][ T8468] ? syscall_enter_from_user_mode+0x1d/0x50 [ 55.736097][ T8468] do_syscall_64+0x2d/0x70 [ 55.740736][ T8468] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.746636][ T8468] RIP: 0033:0x4b117b [ 55.750515][ T8468] 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 [ 55.770112][ T8468] RSP: 002b:000000c0003f5738 EFLAGS: 00000216 ORIG_RAX: 0000000000000000 [ 55.778511][ T8468] RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b117b [ 55.786464][ T8468] RDX: 0000000000001200 RSI: 000000c000425300 RDI: 0000000000000006 [ 55.794418][ T8468] RBP: 000000c0003f5788 R08: 0000000000000001 R09: 0000000000000002 [ 55.802376][ T8468] R10: 0000000000001200 R11: 0000000000000216 R12: ffffffffffffffff [ 55.811073][ T8468] R13: 0000000000000002 R14: 0000000000000001 R15: 0000000000000005 [ 55.822736][ T8468] Kernel Offset: disabled [ 55.827388][ T8468] Rebooting in 86400 seconds..