[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 33.373555] NILFS (loop3): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.383573] NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.388257] NILFS error (device loop3): nilfs_check_page: bad entry in directory #12: rec_len is smaller than minimal - offset=56, inode=212147896334, rec_len=0, name_len=0 [ 33.409989] NILFS error (device loop1): nilfs_check_page: bad entry in directory #12: rec_len is smaller than minimal - offset=56, inode=212147896334, rec_len=0, name_len=0 [ 33.420662] NILFS (loop4): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.432357] NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.439559] NILFS error (device loop4): nilfs_check_page: bad entry in directory #12: rec_len is smaller than minimal - offset=56, inode=212147896334, rec_len=0, name_len=0 [ 33.453196] NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.472101] NILFS error (device loop5): nilfs_check_page: bad entry in directory #12: rec_len is smaller than minimal - offset=56, inode=212147896334, rec_len=0, name_len=0 [ 33.481708] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.490060] NILFS error (device loop2): nilfs_check_page: bad entry in directory #12: rec_len is smaller than minimal - offset=56, inode=212147896334, rec_len=0, name_len=0 [ 33.514122] Remounting filesystem read-only [ 33.519805] Remounting filesystem read-only [ 33.524708] Remounting filesystem read-only [ 33.534946] Remounting filesystem read-only [ 33.540008] NILFS (loop1): mounting fs with errors [ 33.545310] NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.547955] NILFS (loop5): mounting fs with errors [ 33.556848] NILFS (loop3): mounting fs with errors [ 33.560830] NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.567997] NILFS (loop3): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.589863] ------------[ cut here ]------------ [ 33.594827] kernel BUG at kernel/time/timer.c:939! [ 33.598481] Remounting filesystem read-only [ 33.599927] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 33.609451] Modules linked in: [ 33.612637] CPU: 0 PID: 8031 Comm: syz-executor706 Not tainted 4.14.296-syzkaller #0 [ 33.620505] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 33.629852] task: ffff8880b2908640 task.stack: ffff8880b32a8000 [ 33.635905] RIP: 0010:mod_timer+0x7fd/0xf70 [ 33.640214] RSP: 0018:ffff8880b32afb48 EFLAGS: 00010297 [ 33.645569] RAX: ffff8880b2908640 RBX: 00000000ffff99e6 RCX: dffffc0000000000 [ 33.652835] RDX: 0000000000000000 RSI: 00000000ffff99e6 RDI: ffff8880b1928bf0 [ 33.660097] RBP: ffff8880b1928bd8 R08: ffff8880b1928ac0 R09: 000000000004058d [ 33.667359] R10: ffff8880b2908f68 R11: ffff8880b2908640 R12: dffffc0000000000 [ 33.674625] R13: 1ffff11016655f71 R14: ffff8880b1928940 R15: ffff8880b32afc8a [ 33.681887] FS: 00007f450d3d4700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 33.690103] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.695974] CR2: 0000555555bd8628 CR3: 00000000a04a7000 CR4: 00000000003406f0 [ 33.703240] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.706324] NILFS (loop4): error -4 creating segctord thread [ 33.710500] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.710503] Call Trace: [ 33.710517] ? lock_acquire+0x170/0x3f0 [ 33.710525] ? nilfs_transaction_commit+0x171/0xae0 [ 33.710534] ? msleep_interruptible+0xf0/0xf0 [ 33.733088] NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.735082] nilfs_transaction_commit+0x6b4/0xae0 [ 33.735090] nilfs_evict_inode+0x2be/0x3a0 [ 33.735097] ? nilfs_get_block+0x7a0/0x7a0 [ 33.739793] NILFS (loop2): mounting fs with errors [ 33.749348] ? nilfs_get_block+0x7a0/0x7a0 [ 33.749363] evict+0x2c8/0x700 [ 33.749372] iput+0x458/0x7e0 [ 33.749379] dentry_unlink_inode+0x25c/0x310 [ 33.749386] d_delete+0x1c5/0x280 [ 33.749395] vfs_rmdir.part.0+0x260/0x390 [ 33.749401] do_rmdir+0x334/0x3c0 [ 33.749407] ? kern_path_create+0x40/0x40 [ 33.749417] ? do_syscall_64+0x4c/0x640 [ 33.801406] ? SyS_mkdir+0x20/0x20 [ 33.804967] do_syscall_64+0x1d5/0x640 [ 33.808831] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 33.813993] RIP: 0033:0x7f450d44a199 [ 33.817686] RSP: 002b:00007f450d3d42f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 [ 33.825375] RAX: ffffffffffffffda RBX: 00007f450d4d14b0 RCX: 00007f450d44a199 [ 33.832632] RDX: 00007f450d3d4700 RSI: d1cff92d779b1a2f RDI: 0000000020000040 [ 33.839884] RBP: 00007f450d49c730 R08: 00007f450d3d4700 R09: 0000000000000000 [ 33.847140] R10: 00007f450d3d4700 R11: 0000000000000246 R12: 00007f450d49c308 [ 33.854397] R13: 00007f450d49c0c8 R14: 0030656c69662f2e R15: 00007f450d4d14b8 [ 33.861649] Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 66 06 00 00 48 89 5d 10 4c 89 64 24 10 c7 44 24 08 01 00 00 00 e9 db fc ff ff e8 73 ac 0c 00 <0f> 0b e8 6c ac 0c 00 8b 5c 24 0c 48 b8 00 00 00 00 00 fc ff df [ 33.880716] RIP: mod_timer+0x7fd/0xf70 RSP: ffff8880b32afb48 [ 33.886626] ---[ end trace df24e578cdcca7e1 ]--- [ 33.891358] Kernel panic - not syncing: Fatal exception [ 33.896867] Kernel Offset: disabled [ 33.900474] Rebooting in 86400 seconds..