[ OK ] Started OpenBSD Secure Shell server. [ 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 '10.128.0.75' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.570474][ T8377] loop0: detected capacity change from 0 to 4 [ 50.587231][ T8377] VFS: Found a V7 FS (block size = 512) on device loop0 [ 50.599945][ T8377] ------------[ cut here ]------------ [ 50.605598][ T8377] WARNING: CPU: 1 PID: 8377 at fs/inode.c:362 inc_nlink+0x11e/0x130 [ 50.614198][ T8377] Modules linked in: [ 50.618383][ T8377] CPU: 1 PID: 8377 Comm: syz-executor133 Not tainted 5.12.0-rc6-syzkaller #0 [ 50.627173][ T8377] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.638460][ T8377] RIP: 0010:inc_nlink+0x11e/0x130 [ 50.643524][ T8377] Code: ef ff e9 38 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 4c 89 ef e8 2c 3f ef ff e9 3c ff ff ff e8 72 58 ab ff <0f> 0b eb 80 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 41 56 [ 50.665137][ T8377] RSP: 0018:ffffc9000cf37df8 EFLAGS: 00010293 [ 50.671535][ T8377] RAX: ffffffff81cdc05e RBX: 1ffff1100648c010 RCX: ffff888022533880 [ 50.680196][ T8377] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 50.689438][ T8377] RBP: 0000000000000000 R08: ffffffff81cdbfd8 R09: ffffc9000cf37dc8 [ 50.697453][ T8377] R10: fffff520019e6fbd R11: 0000000000000000 R12: dffffc0000000000 [ 50.705648][ T8377] R13: ffff888032460080 R14: ffff888032460038 R15: 0000000000000000 [ 50.713826][ T8377] FS: 00000000013dd300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 50.722926][ T8377] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.730240][ T8377] CR2: 0000558f34a33820 CR3: 0000000012d30000 CR4: 00000000001506f0 [ 50.741222][ T8377] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.749323][ T8377] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.757319][ T8377] Call Trace: [ 50.760696][ T8377] sysv_mkdir+0x1d/0x120 [ 50.764973][ T8377] vfs_mkdir+0x45b/0x640 [ 50.769298][ T8377] do_mkdirat+0x209/0x370 [ 50.773651][ T8377] do_syscall_64+0x2d/0x70 [ 50.778157][ T8377] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 50.784066][ T8377] RIP: 0033:0x443c39 [ 50.788280][ T8377] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 50.808306][ T8377] RSP: 002b:00007ffd861b90f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 50.816751][ T8377] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000443c39 [ 50.825469][ T8377] RDX: 00000000000000b8 RSI: 0000000020000040 RDI: 0000000000000005 [ 50.833770][ T8377] RBP: 00000000004034d0 R08: 0000000000000000 R09: 00000000004004a0 [ 50.841862][ T8377] R10: 00007ffd861b8fb0 R11: 0000000000000246 R12: 0000000000403560 [ 50.850251][ T8377] R13: 0000000000000000 R14: 00000000004b1018 R15: 00000000004004a0 [ 50.858380][ T8377] Kernel panic - not syncing: panic_on_warn set ... [ 50.864979][ T8377] CPU: 0 PID: 8377 Comm: syz-executor133 Not tainted 5.12.0-rc6-syzkaller #0 [ 50.873737][ T8377] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.883921][ T8377] Call Trace: [ 50.887210][ T8377] dump_stack+0x176/0x24e [ 50.891540][ T8377] panic+0x291/0x800 [ 50.895732][ T8377] ? __warn+0x13e/0x270 [ 50.899910][ T8377] __warn+0x26a/0x270 [ 50.903890][ T8377] ? inc_nlink+0x11e/0x130 [ 50.908300][ T8377] ? inc_nlink+0x11e/0x130 [ 50.912720][ T8377] report_bug+0x1b1/0x2e0 [ 50.917085][ T8377] handle_bug+0x3d/0x70 [ 50.921245][ T8377] exc_invalid_op+0x16/0x40 [ 50.925745][ T8377] asm_exc_invalid_op+0x12/0x20 [ 50.930612][ T8377] RIP: 0010:inc_nlink+0x11e/0x130 [ 50.935688][ T8377] Code: ef ff e9 38 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 4c 89 ef e8 2c 3f ef ff e9 3c ff ff ff e8 72 58 ab ff <0f> 0b eb 80 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 41 56 [ 50.955318][ T8377] RSP: 0018:ffffc9000cf37df8 EFLAGS: 00010293 [ 50.961397][ T8377] RAX: ffffffff81cdc05e RBX: 1ffff1100648c010 RCX: ffff888022533880 [ 50.969477][ T8377] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 50.977818][ T8377] RBP: 0000000000000000 R08: ffffffff81cdbfd8 R09: ffffc9000cf37dc8 [ 50.985936][ T8377] R10: fffff520019e6fbd R11: 0000000000000000 R12: dffffc0000000000 [ 50.993915][ T8377] R13: ffff888032460080 R14: ffff888032460038 R15: 0000000000000000 [ 51.001936][ T8377] ? inc_nlink+0x98/0x130 [ 51.006357][ T8377] ? inc_nlink+0x11e/0x130 [ 51.010779][ T8377] ? inc_nlink+0x11e/0x130 [ 51.015201][ T8377] sysv_mkdir+0x1d/0x120 [ 51.019445][ T8377] vfs_mkdir+0x45b/0x640 [ 51.023688][ T8377] do_mkdirat+0x209/0x370 [ 51.028014][ T8377] do_syscall_64+0x2d/0x70 [ 51.032553][ T8377] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 51.039598][ T8377] RIP: 0033:0x443c39 [ 51.043521][ T8377] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 51.063609][ T8377] RSP: 002b:00007ffd861b90f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 51.072032][ T8377] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000443c39 [ 51.080056][ T8377] RDX: 00000000000000b8 RSI: 0000000020000040 RDI: 0000000000000005 [ 51.088041][ T8377] RBP: 00000000004034d0 R08: 0000000000000000 R09: 00000000004004a0 [ 51.096055][ T8377] R10: 00007ffd861b8fb0 R11: 0000000000000246 R12: 0000000000403560 [ 51.104161][ T8377] R13: 0000000000000000 R14: 00000000004b1018 R15: 00000000004004a0 [ 51.112731][ T8377] Kernel Offset: disabled [ 51.117255][ T8377] Rebooting in 86400 seconds..