[  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 '10.128.0.169' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   45.862867][ T6860] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[   45.870919][ T6860] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock
[   45.880920][ T6860] F2FS-fs (loop0): invalid crc_offset: 0
[   45.894298][ T6860] F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=1, run fsck to fix.
[   45.903251][ T6860] F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=2, run fsck to fix.
[   45.932700][ T6860] F2FS-fs (loop0): Try to recover 2th superblock, ret: 0
[   45.939868][ T6860] F2FS-fs (loop0): Mounted with checkpoint version = 27d57943
[   45.961707][ T6860] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
[   45.973415][ T6860] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[   45.981815][ T6860] CPU: 0 PID: 6860 Comm: syz-executor835 Not tainted 5.9.0-rc8-syzkaller #0
[   45.990469][ T6860] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   46.000522][ T6860] RIP: 0010:utf8_casefold+0x43/0x1b0
[   46.005796][ T6860] Code: 89 fd 65 48 8b 04 25 28 00 00 00 48 89 44 24 48 49 be 00 00 00 00 00 fc ff df e8 d8 c5 19 ff 48 83 c5 08 48 89 e8 48 c1 e8 03 <42> 8a 04 30 84 c0 0f 85 21 01 00 00 8b 7d 00 e8 89 f8 ff ff 49 89
[   46.025421][ T6860] RSP: 0018:ffffc900072e7c48 EFLAGS: 00010202
[   46.031457][ T6860] RAX: 0000000000000001 RBX: ffff888087470e10 RCX: ffff8880a6b26440
[   46.039427][ T6860] RDX: 0000000000000000 RSI: ffff888087470e10 RDI: 0000000000000000
[   46.047378][ T6860] RBP: 0000000000000008 R08: ffffffff834b74e9 R09: fffffbfff16c82b1
[   46.055320][ T6860] R10: fffffbfff16c82b1 R11: 0000000000000000 R12: ffffc900072e7dc8
[   46.063273][ T6860] R13: 1ffff92000e5cfb3 R14: dffffc0000000000 R15: 00000000000000ff
[   46.071220][ T6860] FS:  00007f59a4052700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
[   46.080211][ T6860] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   46.086778][ T6860] CR2: 00007f360e3b4000 CR3: 00000000973fb000 CR4: 00000000001506f0
[   46.094728][ T6860] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   46.102681][ T6860] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   46.110634][ T6860] Call Trace:
[   46.113899][ T6860]  ? f2fs_kmalloc+0x119/0x2a0
[   46.118547][ T6860]  f2fs_prepare_lookup+0x3bf/0x640
[   46.123627][ T6860]  f2fs_lookup+0x10d/0x920
[   46.128029][ T6860]  ? d_alloc+0x193/0x1d0
[   46.132243][ T6860]  __lookup_hash+0x115/0x240
[   46.136802][ T6860]  filename_create+0x14b/0x630
[   46.141535][ T6860]  do_mkdirat+0x56/0x310
[   46.145936][ T6860]  do_syscall_64+0x31/0x70
[   46.150342][ T6860]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   46.156221][ T6860] RIP: 0033:0x449367
[   46.160105][ T6860] Code: ff ff ff ff c3 66 0f 1f 44 00 00 48 c7 c0 d0 ff ff ff 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d e0 fb ff c3 66 2e 0f 1f 84 00 00 00 00
[   46.179696][ T6860] RSP: 002b:00007f59a4051bb8 EFLAGS: 00000203 ORIG_RAX: 0000000000000053
[   46.188094][ T6860] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000449367
[   46.196051][ T6860] RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020001940
[   46.204010][ T6860] RBP: 00007f59a40526d0 R08: 0000000000000002 R09: 0000000000000000
[   46.211961][ T6860] R10: 0000000000000000 R11: 0000000000000203 R12: 00000000ffffffff
[   46.219909][ T6860] R13: 0000000000000000 R14: 0000000000000000 R15: 00007f59a4051c50
[   46.227848][ T6860] Modules linked in:
[   46.232941][ T6860] ---[ end trace cf7b61b9a89941d1 ]---
[   46.238404][ T6860] RIP: 0010:utf8_casefold+0x43/0x1b0
[   46.243901][ T6860] Code: 89 fd 65 48 8b 04 25 28 00 00 00 48 89 44 24 48 49 be 00 00 00 00 00 fc ff df e8 d8 c5 19 ff 48 83 c5 08 48 89 e8 48 c1 e8 03 <42> 8a 04 30 84 c0 0f 85 21 01 00 00 8b 7d 00 e8 89 f8 ff ff 49 89
[   46.263773][ T6860] RSP: 0018:ffffc900072e7c48 EFLAGS: 00010202
[   46.270437][ T6860] RAX: 0000000000000001 RBX: ffff888087470e10 RCX: ffff8880a6b26440
[   46.278408][ T6860] RDX: 0000000000000000 RSI: ffff888087470e10 RDI: 0000000000000000
[   46.286710][ T6860] RBP: 0000000000000008 R08: ffffffff834b74e9 R09: fffffbfff16c82b1
[   46.294957][ T6860] R10: fffffbfff16c82b1 R11: 0000000000000000 R12: ffffc900072e7dc8
[   46.303082][ T6860] R13: 1ffff92000e5cfb3 R14: dffffc0000000000 R15: 00000000000000ff
[   46.311190][ T6860] FS:  00007f59a4052700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
[   46.320153][ T6860] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   46.326827][ T6860] CR2: 00007f360e3b4000 CR3: 00000000973fb000 CR4: 00000000001506f0
[   46.334820][ T6860] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   46.342953][ T6860] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   46.351003][ T6860] Kernel panic - not syncing: Fatal exception
[   46.358187][ T6860] Kernel Offset: disabled
[   46.362525][ T6860] Rebooting in 86400 seconds..