Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.43' (ECDSA) to the list of known hosts. syzkaller login: [ 27.666111] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 27.667760] gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" [ 27.689268] ------------[ cut here ]------------ [ 27.694055] WARNING: CPU: 1 PID: 7966 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x26 [ 27.702390] Kernel panic - not syncing: panic_on_warn set ... [ 27.702390] [ 27.709772] CPU: 1 PID: 7966 Comm: syz-executor265 Not tainted 4.14.302-syzkaller #0 [ 27.713973] gfs2: fsid=syz:syz: Now mounting FS... [ 27.717850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 27.717854] Call Trace: [ 27.717870] dump_stack+0x1b2/0x281 [ 27.717883] panic+0x1f9/0x42d [ 27.741573] ? add_taint.cold+0x16/0x16 [ 27.745529] ? sysfs_warn_dup.cold+0x17/0x26 [ 27.749927] ? sysfs_warn_dup.cold+0x17/0x26 [ 27.754312] __warn.cold+0x20/0x44 [ 27.757831] ? ist_end_non_atomic+0x10/0x10 [ 27.762128] ? sysfs_warn_dup.cold+0x17/0x26 [ 27.766599] report_bug+0x208/0x250 [ 27.770205] do_error_trap+0x195/0x2d0 [ 27.774071] ? math_error+0x2d0/0x2d0 [ 27.778287] ? ___preempt_schedule+0x16/0x18 [ 27.782688] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.787514] invalid_op+0x1b/0x40 [ 27.790945] RIP: 0010:sysfs_warn_dup.cold+0x17/0x26 [ 27.795936] RSP: 0018:ffff888095a37728 EFLAGS: 00010282 [ 27.801284] RAX: 000000000000003a RBX: ffff8880a88958d0 RCX: 0000000000000000 [ 27.808533] RDX: 0000000000000000 RSI: ffffffff878bd020 RDI: ffffed1012b46edb [ 27.815789] RBP: ffff8880956dc7c0 R08: 000000000000003a R09: 0000000000000000 [ 27.823471] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888238860e00 [ 27.830729] R13: ffff8880a2d747c0 R14: ffff8880a88958d8 R15: ffff888091625958 [ 27.837991] ? sysfs_warn_dup.cold+0x17/0x26 [ 27.842378] sysfs_create_dir_ns+0x16f/0x1d0 [ 27.846764] kobject_add_internal+0x28b/0x930 [ 27.851238] kobject_init_and_add+0xde/0x120 [ 27.855625] ? kobject_create_and_add+0x200/0x200 [ 27.860449] ? vsnprintf+0x260/0x1340 [ 27.864354] gfs2_sys_fs_add+0x184/0x3f0 [ 27.868393] ? recover_store+0x100/0x100 [ 27.872529] ? snprintf+0xa5/0xd0 [ 27.875986] ? strscpy+0x94/0x280 [ 27.879436] fill_super+0x118b/0x2310 [ 27.883227] ? vsnprintf+0x260/0x1340 [ 27.887010] ? gfs2_online_uevent+0x1b0/0x1b0 [ 27.891492] ? pointer+0x9e0/0x9e0 [ 27.895012] ? snprintf+0xa5/0xd0 [ 27.898442] ? vsprintf+0x30/0x30 [ 27.901890] ? gfs2_open+0x160/0x160 [ 27.905583] ? set_blocksize+0x125/0x380 [ 27.909622] gfs2_mount+0x439/0x510 [ 27.913236] ? fill_super+0x2310/0x2310 [ 27.917202] ? alloc_pages_current+0x15d/0x260 [ 27.921761] ? __lockdep_init_map+0x100/0x560 [ 27.926321] mount_fs+0x92/0x2a0 [ 27.929670] vfs_kern_mount.part.0+0x5b/0x470 [ 27.934143] do_mount+0xe65/0x2a30 [ 27.937667] ? copy_mount_string+0x40/0x40 [ 27.941885] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 27.946879] ? copy_mnt_ns+0xa30/0xa30 [ 27.950743] ? copy_mount_options+0x1fa/0x2f0 [ 27.955216] ? copy_mnt_ns+0xa30/0xa30 [ 27.959081] SyS_mount+0xa8/0x120 [ 27.962512] ? copy_mnt_ns+0xa30/0xa30 [ 27.966378] do_syscall_64+0x1d5/0x640 [ 27.970250] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 27.975419] RIP: 0033:0x7f5604a426ba [ 27.979105] RSP: 002b:00007ffe9a75c9b8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 [ 27.986966] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5604a426ba [ 27.994303] RDX: 0000000020037f40 RSI: 0000000020037f80 RDI: 00007ffe9a75c9d0 [ 28.001637] RBP: 00007ffe9a75c9d0 R08: 00007ffe9a75ca10 R09: 0000000000000002 [ 28.008884] R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000004 [ 28.016419] R13: 00005555570a42c0 R14: 0000000000000000 R15: 00007ffe9a75ca10 [ 28.023905] Kernel Offset: disabled [ 28.027561] Rebooting in 86400 seconds..