Starting Permit User Sessions... [ OK ] Started Regular background program processing daemon. [ OK ] Started System Logging Service. [ OK ] Started Permit User Sessions. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. Starting Load/Save RF Kill Switch Status... [ 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 Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.028658][ T6562] ------------[ cut here ]------------ [ 73.034224][ T6562] WARNING: CPU: 1 PID: 6562 at fs/inode.c:365 inc_nlink+0x144/0x160 [ 73.042941][ T6562] Modules linked in: [ 73.046954][ T6562] CPU: 1 PID: 6562 Comm: syz-executor080 Not tainted 5.15.0-rc4-syzkaller #0 [ 73.056091][ T6562] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.066735][ T6562] RIP: 0010:inc_nlink+0x144/0x160 [ 73.071792][ T6562] Code: ff 4c 89 e7 e8 ad c4 ed ff e9 42 ff ff ff 4c 89 e7 e8 30 c4 ed ff e9 fc fe ff ff 4c 89 e7 e8 23 c4 ed ff eb d4 e8 cc 6e a6 ff <0f> 0b e9 6e ff ff ff e8 20 c4 ed ff e9 44 ff ff ff e8 16 c4 ed ff [ 73.091669][ T6562] RSP: 0018:ffffc90002bafc48 EFLAGS: 00010293 [ 73.097865][ T6562] RAX: 0000000000000000 RBX: ffff88806ce98000 RCX: 0000000000000000 [ 73.106672][ T6562] RDX: ffff888021080000 RSI: ffffffff81cf8fb4 RDI: 0000000000000003 [ 73.114759][ T6562] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88802235d2bf [ 73.122833][ T6562] R10: ffffffff81cf8f20 R11: 0000000000000000 R12: ffff88806ce98048 [ 73.130953][ T6562] R13: ffff88806ce985e0 R14: 0000000000000000 R15: ffffc90002bafcd0 [ 73.139037][ T6562] FS: 00007fa1e19a9700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.148082][ T6562] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.154704][ T6562] CR2: 00007fa1e1a4e0c8 CR3: 0000000072d15000 CR4: 00000000003506e0 [ 73.162859][ T6562] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.171204][ T6562] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.179370][ T6562] Call Trace: [ 73.182760][ T6562] fuse_link+0x35b/0x5b0 [ 73.187103][ T6562] ? create_new_entry.constprop.0+0x660/0x660 [ 73.193269][ T6562] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.199603][ T6562] vfs_link+0x544/0x9c0 [ 73.203787][ T6562] ? security_path_link+0xef/0x130 [ 73.208987][ T6562] do_linkat+0x444/0x5e0 [ 73.213333][ T6562] ? __ia32_sys_symlink+0x90/0x90 [ 73.218728][ T6562] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.225082][ T6562] ? getname_flags.part.0+0x1dd/0x4f0 [ 73.230563][ T6562] __x64_sys_link+0x7d/0xa0 [ 73.235178][ T6562] do_syscall_64+0x35/0xb0 [ 73.239643][ T6562] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 73.245656][ T6562] RIP: 0033:0x7fa1e19f7b79 [ 73.250084][ T6562] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 [ 73.270011][ T6562] RSP: 002b:00007fa1e19a92f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 [ 73.278621][ T6562] RAX: ffffffffffffffda RBX: 00007fa1e1a884c0 RCX: 00007fa1e19f7b79 [ 73.286797][ T6562] RDX: 00007fa1e19f7b79 RSI: 0000000020000080 RDI: 0000000020000040 [ 73.294959][ T6562] RBP: 00007fa1e1a560e4 R08: 0000000000003065 R09: 0000000000000000 [ 73.303404][ T6562] R10: 0000000000003065 R11: 0000000000000246 R12: 00007fa1e1a500d0 [ 73.311602][ T6562] R13: 00007fa1e1a520d8 R14: 00007fa1e1a540e0 R15: 00007fa1e1a884c8 [ 73.319755][ T6562] Kernel panic - not syncing: panic_on_warn set ... [ 73.326347][ T6562] CPU: 1 PID: 6562 Comm: syz-executor080 Not tainted 5.15.0-rc4-syzkaller #0 [ 73.335102][ T6562] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.345349][ T6562] Call Trace: [ 73.348624][ T6562] dump_stack_lvl+0xcd/0x134 [ 73.353235][ T6562] panic+0x2b0/0x6dd [ 73.357115][ T6562] ? __warn_printk+0xf3/0xf3 [ 73.361703][ T6562] ? __warn.cold+0x1a/0x44 [ 73.366107][ T6562] ? inc_nlink+0x144/0x160 [ 73.370559][ T6562] __warn.cold+0x35/0x44 [ 73.374851][ T6562] ? inc_nlink+0x144/0x160 [ 73.379479][ T6562] report_bug+0x1bd/0x210 [ 73.383922][ T6562] handle_bug+0x3c/0x60 [ 73.388089][ T6562] exc_invalid_op+0x14/0x40 [ 73.392605][ T6562] asm_exc_invalid_op+0x12/0x20 [ 73.397449][ T6562] RIP: 0010:inc_nlink+0x144/0x160 [ 73.402474][ T6562] Code: ff 4c 89 e7 e8 ad c4 ed ff e9 42 ff ff ff 4c 89 e7 e8 30 c4 ed ff e9 fc fe ff ff 4c 89 e7 e8 23 c4 ed ff eb d4 e8 cc 6e a6 ff <0f> 0b e9 6e ff ff ff e8 20 c4 ed ff e9 44 ff ff ff e8 16 c4 ed ff [ 73.422423][ T6562] RSP: 0018:ffffc90002bafc48 EFLAGS: 00010293 [ 73.432067][ T6562] RAX: 0000000000000000 RBX: ffff88806ce98000 RCX: 0000000000000000 [ 73.440139][ T6562] RDX: ffff888021080000 RSI: ffffffff81cf8fb4 RDI: 0000000000000003 [ 73.448219][ T6562] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88802235d2bf [ 73.456727][ T6562] R10: ffffffff81cf8f20 R11: 0000000000000000 R12: ffff88806ce98048 [ 73.464697][ T6562] R13: ffff88806ce985e0 R14: 0000000000000000 R15: ffffc90002bafcd0 [ 73.472699][ T6562] ? inc_nlink+0xb0/0x160 [ 73.477250][ T6562] ? inc_nlink+0x144/0x160 [ 73.481699][ T6562] ? inc_nlink+0x144/0x160 [ 73.486214][ T6562] fuse_link+0x35b/0x5b0 [ 73.490483][ T6562] ? create_new_entry.constprop.0+0x660/0x660 [ 73.496575][ T6562] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.502829][ T6562] vfs_link+0x544/0x9c0 [ 73.506996][ T6562] ? security_path_link+0xef/0x130 [ 73.512117][ T6562] do_linkat+0x444/0x5e0 [ 73.516393][ T6562] ? __ia32_sys_symlink+0x90/0x90 [ 73.521432][ T6562] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.527680][ T6562] ? getname_flags.part.0+0x1dd/0x4f0 [ 73.533080][ T6562] __x64_sys_link+0x7d/0xa0 [ 73.537620][ T6562] do_syscall_64+0x35/0xb0 [ 73.542091][ T6562] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 73.548002][ T6562] RIP: 0033:0x7fa1e19f7b79 [ 73.552443][ T6562] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 [ 73.572072][ T6562] RSP: 002b:00007fa1e19a92f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 [ 73.580489][ T6562] RAX: ffffffffffffffda RBX: 00007fa1e1a884c0 RCX: 00007fa1e19f7b79 [ 73.588466][ T6562] RDX: 00007fa1e19f7b79 RSI: 0000000020000080 RDI: 0000000020000040 [ 73.596443][ T6562] RBP: 00007fa1e1a560e4 R08: 0000000000003065 R09: 0000000000000000 [ 73.605265][ T6562] R10: 0000000000003065 R11: 0000000000000246 R12: 00007fa1e1a500d0 [ 73.613773][ T6562] R13: 00007fa1e1a520d8 R14: 00007fa1e1a540e0 R15: 00007fa1e1a884c8 [ 73.622173][ T6562] Kernel Offset: disabled [ 73.626572][ T6562] Rebooting in 86400 seconds..