[ 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 '10.128.0.219' (ECDSA) to the list of known hosts. syzkaller login: [ 45.716403][ T6844] IPVS: ftp: loaded support on port[0] = 21 [ 45.729856][ T6840] IPVS: ftp: loaded support on port[0] = 21 [ 45.731770][ T6846] IPVS: ftp: loaded support on port[0] = 21 [ 45.739725][ T6845] IPVS: ftp: loaded support on port[0] = 21 [ 45.755330][ T6847] IPVS: ftp: loaded support on port[0] = 21 [ 45.767857][ T6848] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 60.813680][ T191] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 60.825522][ T191] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 60.834011][ T191] CPU: 0 PID: 191 Comm: kworker/u4:4 Not tainted 5.9.0-rc8-syzkaller #0 [ 60.842325][ T191] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.852425][ T191] Workqueue: writeback wb_workfn (flush-8:0) executing program [ 60.858413][ T191] RIP: 0010:__ext4_journal_get_write_access+0x7c/0x440 [ 60.865606][ T191] Code: 54 ff 49 8d 5f 30 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f2 09 b8 ff 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 d5 09 b8 ff 4c 8b 2b 4d 85 ed 4c [ 60.885206][ T191] RSP: 0018:ffffc90001327050 EFLAGS: 00010202 [ 60.891268][ T191] RAX: 0000000000000002 RBX: 0000000000000010 RCX: dffffc0000000000 [ 60.899238][ T191] RDX: 0000000000000000 RSI: ffffffff896fe520 RDI: 0000000000000286 [ 60.907292][ T191] RBP: ffffc900013270c0 R08: dffffc0000000000 R09: fffffbfff135f926 [ 60.915262][ T191] R10: fffffbfff135f926 R11: 0000000000000000 R12: dffffc0000000000 [ 60.923842][ T191] R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888218183cf0 [ 60.931814][ T191] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 60.940743][ T191] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 60.947347][ T191] CR2: 00007ffd086c45b0 CR3: 0000000096fe6000 CR4: 00000000001506f0 [ 60.955318][ T191] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 60.963501][ T191] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 60.971513][ T191] Call Trace: [ 60.974844][ T191] ? ext4_get_group_desc+0x35f/0x420 [ 60.980261][ T191] ext4_mb_mark_diskspace_used+0x1f1/0x1690 [ 60.986166][ T191] ext4_mb_new_blocks+0x807/0x1710 [ 60.991290][ T191] ext4_ext_map_blocks+0x2ace/0x6d20 [ 60.996586][ T191] ? ext4_map_blocks+0x7de/0x19d0 [ 61.001705][ T191] ext4_map_blocks+0x8b5/0x19d0 [ 61.006563][ T191] ext4_writepages+0x1657/0x3b00 [ 61.011538][ T191] ? do_writepages+0xda/0x1f0 [ 61.016222][ T191] ? reacquire_held_locks+0x291/0x4e0 [ 61.021598][ T191] ? ext4_readpage+0x140/0x140 [ 61.026393][ T191] do_writepages+0xda/0x1f0 [ 61.030899][ T191] ? rcu_read_lock_sched_held+0x2f/0xa0 [ 61.036458][ T191] __writeback_single_inode+0xcc/0x640 [ 61.041920][ T191] writeback_sb_inodes+0x8f3/0x17f0 [ 61.047136][ T191] wb_writeback+0x483/0x8f0 [ 61.051648][ T191] wb_workfn+0x963/0x11e0 [ 61.056003][ T191] process_one_work+0x789/0xfc0 executing program executing program executing program executing program executing program executing program executing program [ 61.061124][ T191] worker_thread+0xaa4/0x1460 [ 61.065835][ T191] kthread+0x37e/0x3a0 [ 61.069903][ T191] ? rcu_lock_release+0x20/0x20 [ 61.074753][ T191] ? kthread_blkcg+0xd0/0xd0 [ 61.079427][ T191] ret_from_fork+0x1f/0x30 [ 61.084450][ T191] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 61.192069][ T191] ---[ end trace 60e05be809fdb13b ]--- [ 61.202743][ T191] RIP: 0010:__ext4_journal_get_write_access+0x7c/0x440 executing program executing program executing program executing program executing program executing program [ 61.254388][ T191] Code: 54 ff 49 8d 5f 30 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f2 09 b8 ff 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 d5 09 b8 ff 4c 8b 2b 4d 85 ed 4c executing program executing program executing program executing program executing program executing program executing program executing program [ 61.369019][ T191] RSP: 0018:ffffc90001327050 EFLAGS: 00010202 [ 61.375355][ T191] RAX: 0000000000000002 RBX: 0000000000000010 RCX: dffffc0000000000 [ 61.401901][ T191] RDX: 0000000000000000 RSI: ffffffff896fe520 RDI: 0000000000000286 executing program executing program executing program [ 61.436892][ T191] RBP: ffffc900013270c0 R08: dffffc0000000000 R09: fffffbfff135f926 executing program executing program executing program executing program executing program [ 61.479083][ T191] R10: fffffbfff135f926 R11: 0000000000000000 R12: dffffc0000000000 [ 61.499953][ T191] R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888218183cf0 [ 61.509004][ T191] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 executing program executing program [ 61.537792][ T191] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.560591][ T191] CR2: 000000000046b5a0 CR3: 000000008a258000 CR4: 00000000001506f0 executing program [ 61.581918][ T191] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.602535][ T191] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.638883][ T191] Kernel panic - not syncing: Fatal exception [ 61.646862][ T191] Kernel Offset: disabled [ 61.651286][ T191] Rebooting in 86400 seconds..