[ 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 '10.128.1.53' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 98.463490][ T37] audit: type=1400 audit(1630472795.406:8): avc: denied { execmem } for pid=8424 comm="syz-executor225" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program [ 133.482190][ T8463] process 'memfd:[X[mdȅHX% elZ' started with executable stack [ 133.491380][ T8463] ------------[ cut here ]------------ [ 133.496814][ T8463] WARNING: CPU: 1 PID: 8463 at kernel/signal.c:376 task_participate_group_stop+0x2c0/0x370 [ 133.506823][ T8463] Modules linked in: [ 133.510695][ T8463] CPU: 1 PID: 8463 Comm: 4 Not tainted 5.14.0-syzkaller #0 [ 133.517871][ T8463] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 133.527907][ T8463] RIP: 0010:task_participate_group_stop+0x2c0/0x370 [ 133.534516][ T8463] Code: 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 8b ab 08 05 00 00 e9 d0 fd ff ff e8 e0 f4 2d 00 <0f> 0b e9 81 fe ff ff 48 89 ef e8 d1 bf 73 00 e9 4b fe ff ff e8 c7 [ 133.554100][ T8463] RSP: 0018:ffffc90001867c50 EFLAGS: 00010093 [ 133.560145][ T8463] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 133.568088][ T8463] RDX: ffff88801d61e000 RSI: ffffffff814759a0 RDI: 0000000000000003 [ 133.576072][ T8463] RBP: ffff888025e0a3a8 R08: 0000000000000000 R09: 0000000000000003 [ 133.584018][ T8463] R10: ffffffff81475810 R11: 0000000000000000 R12: ffff888025e0a300 [ 133.591964][ T8463] R13: ffff88801d61e508 R14: 0000000000040000 R15: 0000000000000000 [ 133.599953][ T8463] FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 133.608863][ T8463] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 133.615424][ T8463] CR2: 00000000ffbbe37b CR3: 00000000143ba000 CR4: 00000000001506e0 [ 133.623373][ T8463] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 133.631359][ T8463] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 133.639305][ T8463] Call Trace: [ 133.642562][ T8463] do_signal_stop+0x1f1/0x850 [ 133.647221][ T8463] get_signal+0xc84/0x2160 [ 133.651612][ T8463] ? debug_check_no_obj_freed+0x20c/0x420 [ 133.657312][ T8463] arch_do_signal_or_restart+0x2a9/0x1c40 [ 133.663010][ T8463] ? kmem_cache_free+0xe7/0x200 [ 133.667838][ T8463] ? trace_hardirqs_on+0x5b/0x1c0 [ 133.672842][ T8463] ? rcu_read_lock_sched_held+0xd/0x70 [ 133.678284][ T8463] ? kmem_cache_free+0x169/0x200 [ 133.683196][ T8463] ? putname+0x10c/0x150 [ 133.687418][ T8463] ? get_sigframe_size+0x10/0x10 [ 133.692345][ T8463] ? do_execveat_common+0x605/0x780 [ 133.697522][ T8463] ? bprm_execve+0x19b0/0x19b0 [ 133.702261][ T8463] exit_to_user_mode_prepare+0x17d/0x290 [ 133.707872][ T8463] syscall_exit_to_user_mode+0x19/0x60 [ 133.713308][ T8463] do_syscall_64+0x42/0xb0 [ 133.717701][ T8463] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 133.723574][ T8463] RIP: 0023:0xb7000000 [ 133.727636][ T8463] Code: Unable to access opcode bytes at RIP 0xb6ffffd6. [ 133.734626][ T8463] RSP: 002b:00000000ffbbe2a0 EFLAGS: 00000200 ORIG_RAX: 000000000000000b [ 133.743012][ T8463] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 133.750961][ T8463] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 133.758905][ T8463] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 133.766852][ T8463] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 133.774800][ T8463] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 133.782763][ T8463] Kernel panic - not syncing: panic_on_warn set ... [ 133.789318][ T8463] CPU: 1 PID: 8463 Comm: 4 Not tainted 5.14.0-syzkaller #0 [ 133.796486][ T8463] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 133.806513][ T8463] Call Trace: [ 133.809766][ T8463] dump_stack_lvl+0xcd/0x134 [ 133.814332][ T8463] panic+0x306/0x73d [ 133.818204][ T8463] ? __warn_printk+0xf3/0xf3 [ 133.822767][ T8463] ? __warn.cold+0x1a/0x44 [ 133.827157][ T8463] ? task_participate_group_stop+0x2c0/0x370 [ 133.833114][ T8463] __warn.cold+0x35/0x44 [ 133.837329][ T8463] ? task_participate_group_stop+0x2c0/0x370 [ 133.843287][ T8463] report_bug+0x1bd/0x210 [ 133.847593][ T8463] handle_bug+0x3c/0x60 [ 133.851732][ T8463] exc_invalid_op+0x14/0x40 [ 133.856214][ T8463] asm_exc_invalid_op+0x12/0x20 [ 133.861043][ T8463] RIP: 0010:task_participate_group_stop+0x2c0/0x370 [ 133.867623][ T8463] Code: 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 8b ab 08 05 00 00 e9 d0 fd ff ff e8 e0 f4 2d 00 <0f> 0b e9 81 fe ff ff 48 89 ef e8 d1 bf 73 00 e9 4b fe ff ff e8 c7 [ 133.887207][ T8463] RSP: 0018:ffffc90001867c50 EFLAGS: 00010093 [ 133.893270][ T8463] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 133.901217][ T8463] RDX: ffff88801d61e000 RSI: ffffffff814759a0 RDI: 0000000000000003 [ 133.909175][ T8463] RBP: ffff888025e0a3a8 R08: 0000000000000000 R09: 0000000000000003 [ 133.917122][ T8463] R10: ffffffff81475810 R11: 0000000000000000 R12: ffff888025e0a300 [ 133.925068][ T8463] R13: ffff88801d61e508 R14: 0000000000040000 R15: 0000000000000000 [ 133.933013][ T8463] ? task_participate_group_stop+0x130/0x370 [ 133.938973][ T8463] ? task_participate_group_stop+0x2c0/0x370 [ 133.944930][ T8463] do_signal_stop+0x1f1/0x850 [ 133.949584][ T8463] get_signal+0xc84/0x2160 [ 133.953978][ T8463] ? debug_check_no_obj_freed+0x20c/0x420 [ 133.959675][ T8463] arch_do_signal_or_restart+0x2a9/0x1c40 [ 133.965373][ T8463] ? kmem_cache_free+0xe7/0x200 [ 133.970200][ T8463] ? trace_hardirqs_on+0x5b/0x1c0 [ 133.975200][ T8463] ? rcu_read_lock_sched_held+0xd/0x70 [ 133.980639][ T8463] ? kmem_cache_free+0x169/0x200 [ 133.985554][ T8463] ? putname+0x10c/0x150 [ 133.989769][ T8463] ? get_sigframe_size+0x10/0x10 [ 133.994681][ T8463] ? do_execveat_common+0x605/0x780 [ 133.999859][ T8463] ? bprm_execve+0x19b0/0x19b0 [ 134.004600][ T8463] exit_to_user_mode_prepare+0x17d/0x290 [ 134.010213][ T8463] syscall_exit_to_user_mode+0x19/0x60 [ 134.015649][ T8463] do_syscall_64+0x42/0xb0 [ 134.020044][ T8463] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 134.025931][ T8463] RIP: 0023:0xb7000000 [ 134.029980][ T8463] Code: Unable to access opcode bytes at RIP 0xb6ffffd6. [ 134.036967][ T8463] RSP: 002b:00000000ffbbe2a0 EFLAGS: 00000200 ORIG_RAX: 000000000000000b [ 134.045353][ T8463] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 134.053308][ T8463] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 134.061257][ T8463] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 134.069208][ T8463] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 134.077160][ T8463] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 134.086337][ T8463] Kernel Offset: disabled [ 134.090650][ T8463] Rebooting in 86400 seconds..