[ 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 '10.128.1.46' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program syzkaller login: [ 70.582204][ C0] hrtimer: interrupt took 18536 ns 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 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 executing program executing program executing program executing program executing program executing program executing program [ 76.672953][ T7530] ------------[ cut here ]------------ [ 76.678951][ T7530] DEBUG_LOCKS_WARN_ON(lock->magic != lock) [ 76.679030][ T7530] WARNING: CPU: 0 PID: 7530 at kernel/locking/mutex.c:1415 mutex_trylock+0x220/0x2c0 [ 76.695601][ T7530] Kernel panic - not syncing: panic_on_warn set ... [ 76.702387][ T7530] CPU: 0 PID: 7530 Comm: syz-executor826 Not tainted 5.8.0-rc3-next-20200701-syzkaller #0 [ 76.712249][ T7530] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.722374][ T7530] Call Trace: [ 76.725645][ T7530] dump_stack+0x18f/0x20d [ 76.729950][ T7530] panic+0x2e3/0x75c [ 76.733821][ T7530] ? __warn_printk+0xf3/0xf3 [ 76.738444][ T7530] ? lock_downgrade+0x820/0x820 [ 76.743267][ T7530] ? cont_add+0x98/0x120 [ 76.747485][ T7530] ? __warn.cold+0x5/0x45 [ 76.751788][ T7530] ? __warn+0xd6/0x1f2 [ 76.755834][ T7530] ? mutex_trylock+0x220/0x2c0 [ 76.760572][ T7530] __warn.cold+0x20/0x45 [ 76.764790][ T7530] ? mutex_trylock+0x220/0x2c0 [ 76.769531][ T7530] report_bug+0x1bd/0x210 [ 76.773841][ T7530] handle_bug+0x38/0x90 [ 76.777973][ T7530] exc_invalid_op+0x13/0x40 [ 76.782457][ T7530] asm_exc_invalid_op+0x12/0x20 [ 76.787300][ T7530] RIP: 0010:mutex_trylock+0x220/0x2c0 [ 76.792672][ T7530] Code: 08 84 d2 0f 85 99 00 00 00 8b 3d 0b 17 c4 02 85 ff 0f 85 6a fe ff ff 48 c7 c6 00 a0 4b 88 48 c7 c7 c0 9d 4b 88 e8 82 38 5a f9 <0f> 0b e9 50 fe ff ff ff 74 24 38 48 8d 7b 68 45 31 c9 31 c9 41 b8 [ 76.812348][ T7530] RSP: 0018:ffffc90002c37818 EFLAGS: 00010282 [ 76.818483][ T7530] RAX: 0000000000000000 RBX: ffff8880764a33f8 RCX: 0000000000000000 [ 76.826446][ T7530] RDX: ffff8880764ac280 RSI: ffffffff815d7e47 RDI: fffff52000586ef5 [ 76.834496][ T7530] RBP: ffff8880764a3080 R08: 0000000000000000 R09: ffffffff89bb7a43 [ 76.842457][ T7530] R10: 000000000000059d R11: 0000000000000001 R12: ffffffff8c91f1a0 [ 76.850418][ T7530] R13: ffff8880764a33c0 R14: 0000000000000000 R15: ffff8880764a35b8 [ 76.858379][ T7530] ? vprintk_func+0x97/0x1a6 [ 76.862951][ T7530] ? mutex_trylock+0x220/0x2c0 [ 76.867694][ T7530] rxrpc_recvmsg+0x695/0x1a03 [ 76.872445][ T7530] ? rxrpc_abort_call+0x60/0x60 [ 76.877271][ T7530] ? __might_fault+0xef/0x1d0 [ 76.882273][ T7530] ? find_held_lock+0x2d/0x110 [ 76.887231][ T7530] ? aa_af_perm+0x230/0x230 [ 76.891715][ T7530] ? __might_fault+0x11f/0x1d0 [ 76.896454][ T7530] ? finish_wait+0x260/0x260 [ 76.901018][ T7530] ? security_socket_recvmsg+0x8f/0xc0 [ 76.906453][ T7530] ? rxrpc_abort_call+0x60/0x60 [ 76.911298][ T7530] ____sys_recvmsg+0x2c4/0x640 [ 76.916136][ T7530] ? move_addr_to_kernel.part.0+0x110/0x110 [ 76.922003][ T7530] ? __copy_msghdr_from_user+0x2b4/0x4b0 [ 76.927616][ T7530] ? import_iovec+0x23b/0x3d0 [ 76.932298][ T7530] ? compat_import_iovec+0x3d0/0x3d0 [ 76.937558][ T7530] ___sys_recvmsg+0x127/0x200 [ 76.942208][ T7530] ? __copy_msghdr_from_user+0x4b0/0x4b0 [ 76.947813][ T7530] ? lock_downgrade+0x820/0x820 [ 76.952846][ T7530] ? __fget_files+0x294/0x400 [ 76.957514][ T7530] ? __fget_light+0xea/0x280 [ 76.962106][ T7530] do_recvmmsg+0x24d/0x6d0 [ 76.966516][ T7530] ? ___sys_recvmsg+0x200/0x200 [ 76.971346][ T7530] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 76.977316][ T7530] ? lock_acquire+0x1f1/0xad0 [ 76.981970][ T7530] ? find_held_lock+0x2d/0x110 [ 76.986712][ T7530] ? calculate_sigpending+0x42/0xa0 [ 76.991893][ T7530] ? find_held_lock+0x2d/0x110 [ 76.996806][ T7530] __x64_sys_recvmmsg+0x20b/0x260 [ 77.001823][ T7530] ? __do_sys_socketcall+0x550/0x550 [ 77.007168][ T7530] ? lock_is_held_type+0xb0/0xe0 [ 77.012081][ T7530] ? do_syscall_64+0x1c/0xe0 [ 77.016649][ T7530] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 77.022606][ T7530] do_syscall_64+0x60/0xe0 [ 77.026999][ T7530] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.032884][ T7530] RIP: 0033:0x446b49 [ 77.036762][ T7530] Code: Bad RIP value. [ 77.040802][ T7530] RSP: 002b:00007f7b0dc62d98 EFLAGS: 00000246 ORIG_RAX: 000000000000012b [ 77.049205][ T7530] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446b49 [ 77.057358][ T7530] RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000004 [ 77.065416][ T7530] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 77.073367][ T7530] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 77.081315][ T7530] R13: 0000000000000001 R14: 0000000000000110 R15: 0000000000000018 [ 77.090891][ T7530] Kernel Offset: disabled [ 77.095207][ T7530] Rebooting in 86400 seconds..