[ 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 '10.128.1.19' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 145.031545][ T7101] ------------[ cut here ]------------ [ 145.037126][ T7101] DEBUG_LOCKS_WARN_ON(lock->magic != lock) [ 145.037207][ T7101] WARNING: CPU: 1 PID: 7101 at kernel/locking/mutex.c:1415 mutex_trylock+0x220/0x2c0 [ 145.052514][ T7101] Kernel panic - not syncing: panic_on_warn set ... [ 145.059135][ T7101] CPU: 1 PID: 7101 Comm: syz-executor677 Not tainted 5.8.0-rc3-syzkaller #0 [ 145.067779][ T7101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 145.077823][ T7101] Call Trace: [ 145.081095][ T7101] dump_stack+0x18f/0x20d [ 145.085404][ T7101] panic+0x2e3/0x75c [ 145.089276][ T7101] ? __warn_printk+0xf3/0xf3 [ 145.093846][ T7101] ? lock_downgrade+0x820/0x820 [ 145.098674][ T7101] ? cont_add+0x98/0x120 [ 145.102894][ T7101] ? __warn.cold+0x5/0x45 [ 145.107214][ T7101] ? __warn+0xd6/0x1f2 [ 145.111263][ T7101] ? mutex_trylock+0x220/0x2c0 [ 145.116005][ T7101] __warn.cold+0x20/0x45 [ 145.120233][ T7101] ? mutex_trylock+0x220/0x2c0 [ 145.126104][ T7101] report_bug+0x1bd/0x210 [ 145.130586][ T7101] handle_bug+0x38/0x90 [ 145.134719][ T7101] exc_invalid_op+0x13/0x40 [ 145.139197][ T7101] asm_exc_invalid_op+0x12/0x20 [ 145.144025][ T7101] RIP: 0010:mutex_trylock+0x220/0x2c0 [ 145.149384][ T7101] Code: 08 84 d2 0f 85 99 00 00 00 8b 3d cb 07 c8 02 85 ff 0f 85 6a fe ff ff 48 c7 c6 60 9c 4b 88 48 c7 c7 20 9a 4b 88 e8 82 77 5e f9 <0f> 0b e9 50 fe ff ff ff 74 24 38 48 8d 7b 68 45 31 c9 31 c9 41 b8 [ 145.168976][ T7101] RSP: 0018:ffffc900020a7818 EFLAGS: 00010282 [ 145.175018][ T7101] RAX: 0000000000000000 RBX: ffff888096319a78 RCX: 0000000000000000 [ 145.182982][ T7101] RDX: ffff8880966e43c0 RSI: ffffffff815d4f47 RDI: fffff52000414ef5 [ 145.190948][ T7101] RBP: ffff888096319700 R08: 0000000000000000 R09: ffffffff89bb5ba3 [ 145.198942][ T7101] R10: 0000000000000599 R11: 0000000000000001 R12: ffffffff8c90d1a0 [ 145.206937][ T7101] R13: ffff888096319a40 R14: 0000000000000000 R15: ffff888096319c38 [ 145.214904][ T7101] ? vprintk_func+0x97/0x1a6 [ 145.219530][ T7101] ? mutex_trylock+0x220/0x2c0 [ 145.224272][ T7101] rxrpc_recvmsg+0x695/0x1a03 [ 145.228929][ T7101] ? rxrpc_abort_call+0x60/0x60 [ 145.233755][ T7101] ? __might_fault+0xef/0x1d0 [ 145.238406][ T7101] ? find_held_lock+0x2d/0x110 [ 145.243148][ T7101] ? aa_af_perm+0x230/0x230 [ 145.247645][ T7101] ? __might_fault+0x11f/0x1d0 [ 145.252406][ T7101] ? finish_wait+0x260/0x260 [ 145.256980][ T7101] ? security_socket_recvmsg+0x8f/0xc0 [ 145.262416][ T7101] ? rxrpc_abort_call+0x60/0x60 [ 145.267247][ T7101] ____sys_recvmsg+0x2c4/0x640 [ 145.272112][ T7101] ? move_addr_to_kernel.part.0+0x110/0x110 [ 145.278018][ T7101] ? __copy_msghdr_from_user+0x2b4/0x4b0 [ 145.283627][ T7101] ? import_iovec+0x23b/0x3d0 [ 145.288282][ T7101] ? compat_import_iovec+0x3d0/0x3d0 [ 145.293547][ T7101] ___sys_recvmsg+0x127/0x200 [ 145.298484][ T7101] ? __copy_msghdr_from_user+0x4b0/0x4b0 [ 145.304214][ T7101] ? lock_downgrade+0x820/0x820 [ 145.309084][ T7101] ? __fget_files+0x294/0x400 [ 145.313781][ T7101] ? __fget_light+0xea/0x280 [ 145.318361][ T7101] do_recvmmsg+0x24d/0x6d0 [ 145.322771][ T7101] ? ___sys_recvmsg+0x200/0x200 [ 145.327607][ T7101] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 145.333564][ T7101] ? rxrpc_connect+0x22d/0x290 [ 145.338397][ T7101] ? lockdep_hardirqs_on+0x6a/0xe0 [ 145.343501][ T7101] ? rxrpc_connect+0x22d/0x290 [ 145.348242][ T7101] ? __local_bh_enable_ip+0x159/0x250 [ 145.353590][ T7101] ? rxrpc_connect+0x232/0x290 [ 145.358346][ T7101] ? rxrpc_bind+0x5c0/0x5c0 [ 145.362829][ T7101] ? __x64_sys_futex+0x378/0x4e0 [ 145.367745][ T7101] __x64_sys_recvmmsg+0x20b/0x260 [ 145.372761][ T7101] ? __do_sys_socketcall+0x550/0x550 [ 145.378109][ T7101] ? lock_is_held_type+0xb0/0xe0 [ 145.383032][ T7101] ? do_syscall_64+0x1c/0xe0 [ 145.387619][ T7101] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 145.393596][ T7101] do_syscall_64+0x60/0xe0 [ 145.397999][ T7101] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 145.403875][ T7101] RIP: 0033:0x446979 [ 145.407741][ T7101] Code: Bad RIP value. [ 145.411791][ T7101] RSP: 002b:00007fdd31859d98 EFLAGS: 00000246 ORIG_RAX: 000000000000012b [ 145.420184][ T7101] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446979 [ 145.428137][ T7101] RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000003 [ 145.436086][ T7101] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 145.444663][ T7101] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 145.452614][ T7101] R13: 0000000000000001 R14: 0000000000000110 R15: 0000000000000018 [ 145.463055][ T7101] Kernel Offset: disabled [ 145.467386][ T7101] Rebooting in 86400 seconds..