[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 '10.128.0.106' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 74.194566][ T6572] overlayfs: conflicting lowerdir path [ 74.222840][ T6576] ------------[ cut here ]------------ [ 74.228702][ T6576] WARNING: CPU: 1 PID: 6576 at fs/overlayfs/dir.c:212 ovl_create_real+0x272/0x520 [ 74.238537][ T6576] Modules linked in: [ 74.242555][ T6576] CPU: 1 PID: 6576 Comm: syz-executor088 Not tainted 5.14.0-rc3-next-20210729-syzkaller #0 [ 74.253071][ T6576] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.263597][ T6576] RIP: 0010:ovl_create_real+0x272/0x520 [ 74.270492][ T6576] Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 80 02 00 00 49 83 7c 24 68 00 0f 85 7a fe ff ff e8 de b6 c3 fe <0f> 0b 4c 89 e5 49 c7 c4 fb ff ff ff e9 57 fe ff ff 66 81 eb 00 10 [ 74.291334][ T6576] RSP: 0018:ffffc90002bef958 EFLAGS: 00010293 [ 74.298006][ T6576] RAX: 0000000000000000 RBX: 0000000000004000 RCX: 0000000000000000 [ 74.306094][ T6576] RDX: ffff88807b10b900 RSI: ffffffff82b20102 RDI: ffff88806f971208 [ 74.314473][ T6576] RBP: ffff88806f9711a0 R08: 0000000000000000 R09: 0000000000000000 [ 74.322984][ T6576] R10: ffffffff82b2018b R11: 0000000000000000 R12: ffff88806f9711a0 [ 74.332071][ T6576] R13: 0000000000004000 R14: ffff8880715c8a20 R15: ffff8880715c8b00 [ 74.340896][ T6576] FS: 00007fe7eef6d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 74.351120][ T6576] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.359020][ T6576] CR2: 00007f49bbacf000 CR3: 000000001eea6000 CR4: 00000000001506f0 [ 74.368841][ T6576] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.378251][ T6576] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.386338][ T6576] Call Trace: [ 74.391155][ T6576] ovl_workdir_create+0x3a9/0x5b0 [ 74.396300][ T6576] ? ovl_mount_dir+0x1f0/0x1f0 [ 74.402258][ T6576] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 74.409067][ T6576] ? __mnt_want_write+0x1bc/0x2a0 [ 74.414132][ T6576] ovl_fill_super+0x199a/0x5fb0 [ 74.419362][ T6576] ? find_held_lock+0x2d/0x110 [ 74.424155][ T6576] ? ovl_show_options+0x730/0x730 [ 74.429911][ T6576] ? sget+0x472/0x580 [ 74.433995][ T6576] ? lock_downgrade+0x6e0/0x6e0 [ 74.439025][ T6576] ? __down_timeout+0x10/0x10 [ 74.443724][ T6576] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 74.450233][ T6576] ? sget+0x11f/0x580 [ 74.454234][ T6576] ? set_anon_super_fc+0xb0/0xb0 [ 74.459251][ T6576] ? ovl_show_options+0x730/0x730 [ 74.464310][ T6576] mount_nodev+0x60/0x110 [ 74.468949][ T6576] ? ovl_own_xattr_set+0x10/0x10 [ 74.473995][ T6576] legacy_get_tree+0x105/0x220 [ 74.479351][ T6576] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 74.485629][ T6576] ? ns_capable+0xd9/0x100 [ 74.490107][ T6578] overlayfs: upperdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection. [ 74.491268][ T6576] vfs_get_tree+0x89/0x2f0 [ 74.512062][ T6576] path_mount+0x132a/0x1fa0 [ 74.517408][ T6576] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 74.523974][ T6576] ? strncpy_from_user+0x2a0/0x3e0 [ 74.529945][ T6576] ? finish_automount+0xaf0/0xaf0 [ 74.535219][ T6576] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 74.542372][ T6576] ? getname_flags.part.0+0x1dd/0x4f0 [ 74.548775][ T6576] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 74.555692][ T6576] __x64_sys_mount+0x27f/0x300 [ 74.561250][ T6576] ? copy_mnt_ns+0xae0/0xae0 [ 74.565976][ T6576] ? syscall_enter_from_user_mode+0x21/0x70 [ 74.572811][ T6576] do_syscall_64+0x35/0xb0 [ 74.577658][ T6576] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 74.583604][ T6576] RIP: 0033:0x4458d9 [ 74.588356][ T6576] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 74.608648][ T6576] RSP: 002b:00007fe7eef6d2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 74.618589][ T6576] RAX: ffffffffffffffda RBX: 00000000004ca400 RCX: 00000000004458d9 [ 74.626922][ T6576] RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 000000000040000d [ 74.634916][ T6576] RBP: 000000000049a074 R08: 0000000020000100 R09: 0000000000000000 [ 74.643959][ T6576] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 74.652205][ T6576] R13: 0079616c7265766f R14: 003270756f726763 R15: 00000000004ca408 [ 74.660753][ T6576] Kernel panic - not syncing: panic_on_warn set ... [ 74.667558][ T6576] CPU: 0 PID: 6576 Comm: syz-executor088 Not tainted 5.14.0-rc3-next-20210729-syzkaller #0 [ 74.677792][ T6576] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.688209][ T6576] Call Trace: [ 74.692343][ T6576] dump_stack_lvl+0xcd/0x134 [ 74.697022][ T6576] panic+0x306/0x733 [ 74.700934][ T6576] ? __warn_printk+0xf3/0xf3 [ 74.705546][ T6576] ? __warn.cold+0x1a/0x44 [ 74.709979][ T6576] ? ovl_create_real+0x272/0x520 [ 74.715068][ T6576] __warn.cold+0x35/0x44 [ 74.719498][ T6576] ? ovl_create_real+0x272/0x520 [ 74.724440][ T6576] report_bug+0x1bd/0x210 [ 74.728788][ T6576] handle_bug+0x3c/0x60 [ 74.733126][ T6576] exc_invalid_op+0x14/0x40 [ 74.737907][ T6576] asm_exc_invalid_op+0x12/0x20 [ 74.742947][ T6576] RIP: 0010:ovl_create_real+0x272/0x520 [ 74.748500][ T6576] Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 80 02 00 00 49 83 7c 24 68 00 0f 85 7a fe ff ff e8 de b6 c3 fe <0f> 0b 4c 89 e5 49 c7 c4 fb ff ff ff e9 57 fe ff ff 66 81 eb 00 10 [ 74.768364][ T6576] RSP: 0018:ffffc90002bef958 EFLAGS: 00010293 [ 74.774533][ T6576] RAX: 0000000000000000 RBX: 0000000000004000 RCX: 0000000000000000 [ 74.782936][ T6576] RDX: ffff88807b10b900 RSI: ffffffff82b20102 RDI: ffff88806f971208 [ 74.790928][ T6576] RBP: ffff88806f9711a0 R08: 0000000000000000 R09: 0000000000000000 [ 74.799069][ T6576] R10: ffffffff82b2018b R11: 0000000000000000 R12: ffff88806f9711a0 [ 74.807228][ T6576] R13: 0000000000004000 R14: ffff8880715c8a20 R15: ffff8880715c8b00 [ 74.815653][ T6576] ? ovl_create_real+0x2fb/0x520 [ 74.820687][ T6576] ? ovl_create_real+0x272/0x520 [ 74.825632][ T6576] ? ovl_create_real+0x272/0x520 [ 74.830672][ T6576] ovl_workdir_create+0x3a9/0x5b0 [ 74.835709][ T6576] ? ovl_mount_dir+0x1f0/0x1f0 [ 74.840585][ T6576] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 74.846925][ T6576] ? __mnt_want_write+0x1bc/0x2a0 [ 74.851970][ T6576] ovl_fill_super+0x199a/0x5fb0 [ 74.856839][ T6576] ? find_held_lock+0x2d/0x110 [ 74.861602][ T6576] ? ovl_show_options+0x730/0x730 [ 74.866800][ T6576] ? sget+0x472/0x580 [ 74.870781][ T6576] ? lock_downgrade+0x6e0/0x6e0 [ 74.875642][ T6576] ? __down_timeout+0x10/0x10 [ 74.880329][ T6576] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 74.886573][ T6576] ? sget+0x11f/0x580 [ 74.890576][ T6576] ? set_anon_super_fc+0xb0/0xb0 [ 74.895600][ T6576] ? ovl_show_options+0x730/0x730 [ 74.900634][ T6576] mount_nodev+0x60/0x110 [ 74.904970][ T6576] ? ovl_own_xattr_set+0x10/0x10 [ 74.909916][ T6576] legacy_get_tree+0x105/0x220 [ 74.914683][ T6576] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 74.920924][ T6576] ? ns_capable+0xd9/0x100 [ 74.925341][ T6576] vfs_get_tree+0x89/0x2f0 [ 74.929759][ T6576] path_mount+0x132a/0x1fa0 [ 74.934272][ T6576] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 74.940597][ T6576] ? strncpy_from_user+0x2a0/0x3e0 [ 74.945885][ T6576] ? finish_automount+0xaf0/0xaf0 [ 74.950994][ T6576] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 74.957503][ T6576] ? getname_flags.part.0+0x1dd/0x4f0 [ 74.962873][ T6576] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 74.969219][ T6576] __x64_sys_mount+0x27f/0x300 [ 74.974005][ T6576] ? copy_mnt_ns+0xae0/0xae0 [ 74.978599][ T6576] ? syscall_enter_from_user_mode+0x21/0x70 [ 74.984527][ T6576] do_syscall_64+0x35/0xb0 [ 74.989177][ T6576] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 74.995078][ T6576] RIP: 0033:0x4458d9 [ 74.998968][ T6576] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 75.019894][ T6576] RSP: 002b:00007fe7eef6d2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 75.028321][ T6576] RAX: ffffffffffffffda RBX: 00000000004ca400 RCX: 00000000004458d9 [ 75.036464][ T6576] RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 000000000040000d [ 75.044693][ T6576] RBP: 000000000049a074 R08: 0000000020000100 R09: 0000000000000000 [ 75.053091][ T6576] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 75.061080][ T6576] R13: 0079616c7265766f R14: 003270756f726763 R15: 00000000004ca408 [ 75.070977][ T6576] Kernel Offset: disabled [ 75.075398][ T6576] Rebooting in 86400 seconds..