[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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. [ 58.478095][ T181] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:4/181 [ 58.487275][ T181] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 58.493684][ T181] CPU: 1 PID: 181 Comm: kworker/u4:4 Not tainted 5.8.0-rc1-syzkaller #0 [ 58.502029][ T181] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.512101][ T181] Workqueue: writeback wb_workfn (flush-8:0) [ 58.518087][ T181] Call Trace: [ 58.521472][ T181] dump_stack+0x18f/0x20d [ 58.525818][ T181] check_preemption_disabled+0x20d/0x220 [ 58.531460][ T181] ext4_mb_new_blocks+0xa4d/0x3b70 [ 58.536578][ T181] ? ext4_find_extent+0x81a/0xad0 [ 58.541742][ T181] ? ext4_ext_search_right+0x2ca/0xb20 [ 58.547210][ T181] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 58.552962][ T181] ext4_ext_map_blocks+0x201b/0x33e0 [ 58.558354][ T181] ? ext4_ext_release+0x10/0x10 [ 58.563230][ T181] ? down_write_killable+0x170/0x170 [ 58.568519][ T181] ? ext4_es_lookup_extent+0x41d/0xd10 [ 58.574078][ T181] ext4_map_blocks+0x4cb/0x1640 [ 58.578931][ T181] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 58.584123][ T181] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 58.589676][ T181] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 58.595740][ T181] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 58.601298][ T181] ext4_writepages+0x1a7b/0x33c0 [ 58.606244][ T181] ? __ext4_mark_inode_dirty+0x940/0x940 [ 58.611857][ T181] ? __lock_acquire+0x2224/0x48b0 [ 58.616892][ T181] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 58.622878][ T181] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 58.628952][ T181] ? __ext4_mark_inode_dirty+0x940/0x940 [ 58.634567][ T181] ? do_writepages+0xfa/0x2a0 [ 58.639225][ T181] do_writepages+0xfa/0x2a0 [ 58.643719][ T181] ? page_writeback_cpu_online+0x10/0x10 [ 58.649351][ T181] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 58.654882][ T181] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 58.660843][ T181] ? lock_downgrade+0x840/0x840 [ 58.665683][ T181] __writeback_single_inode+0x12a/0x13d0 [ 58.671299][ T181] ? _raw_spin_unlock+0x24/0x40 [ 58.676130][ T181] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 58.682094][ T181] writeback_sb_inodes+0x515/0xdc0 [ 58.687211][ T181] ? __writeback_single_inode+0x13d0/0x13d0 [ 58.693102][ T181] __writeback_inodes_wb+0xc3/0x250 [ 58.698290][ T181] wb_writeback+0x8db/0xd50 [ 58.702796][ T181] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 58.709108][ T181] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 58.714986][ T181] ? cpumask_next+0x3c/0x40 [ 58.719485][ T181] ? get_nr_dirty_inodes+0xd6/0x130 [ 58.724670][ T181] wb_workfn+0xab3/0x1090 [ 58.728992][ T181] ? inode_wait_for_writeback+0x30/0x30 [ 58.734525][ T181] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 58.740053][ T181] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 58.746022][ T181] process_one_work+0x965/0x1690 [ 58.750954][ T181] ? lock_release+0x800/0x800 [ 58.755614][ T181] ? pwq_dec_nr_in_flight+0x310/0x310 [ 58.760983][ T181] ? rwlock_bug.part.0+0x90/0x90 [ 58.765910][ T181] worker_thread+0x96/0xe10 [ 58.770419][ T181] ? process_one_work+0x1690/0x1690 [ 58.775611][ T181] kthread+0x3b5/0x4a0 [ 58.779672][ T181] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 58.785480][ T181] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 58.791186][ T181] ret_from_fork+0x1f/0x30 Starting Load/Save RF Kill Switch Status... [ 58.860045][ T6745] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6745 [ 58.869787][ T6745] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 58.875683][ T6745] CPU: 1 PID: 6745 Comm: systemd-rfkill Not tainted 5.8.0-rc1-syzkaller #0 [ 58.884253][ T6745] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.894300][ T6745] Call Trace: [ 58.897584][ T6745] dump_stack+0x18f/0x20d [ 58.901907][ T6745] check_preemption_disabled+0x20d/0x220 [ 58.907525][ T6745] ext4_mb_new_blocks+0xa4d/0x3b70 [ 58.912645][ T6745] ? ext4_ext_search_right+0x2ca/0xb20 [ 58.918080][ T6745] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 58.923778][ T6745] ext4_ext_map_blocks+0x201b/0x33e0 [ 58.929046][ T6745] ? ext4_ext_release+0x10/0x10 [ 58.933899][ T6745] ? down_write_killable+0x170/0x170 [ 58.939161][ T6745] ? ext4_es_lookup_extent+0x41d/0xd10 [ 58.944596][ T6745] ext4_map_blocks+0x4cb/0x1640 [ 58.949427][ T6745] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 58.954613][ T6745] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 58.960136][ T6745] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 58.966091][ T6745] ? prandom_u32_state+0xe/0x170 [ 58.971008][ T6745] ? __brelse+0x84/0xa0 [ 58.975143][ T6745] ? __ext4_new_inode+0x144/0x55e0 [ 58.980246][ T6745] ext4_getblk+0xad/0x520 [ 58.984563][ T6745] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 58.990261][ T6745] ? ext4_free_inode+0x1700/0x1700 [ 58.995625][ T6745] ext4_bread+0x7c/0x380 [ 58.999847][ T6745] ? ext4_getblk+0x520/0x520 [ 59.004494][ T6745] ? dquot_get_next_dqblk+0x180/0x180 [ 59.009864][ T6745] ext4_append+0x153/0x360 [ 59.014454][ T6745] ext4_mkdir+0x5e0/0xdf0 [ 59.018772][ T6745] ? ext4_rmdir+0xde0/0xde0 [ 59.023270][ T6745] ? security_inode_permission+0xc4/0xf0 [ 59.028891][ T6745] vfs_mkdir+0x419/0x690 [ 59.033118][ T6745] do_mkdirat+0x21e/0x280 [ 59.037472][ T6745] ? __ia32_sys_mknod+0xb0/0xb0 [ 59.042315][ T6745] ? do_syscall_64+0x1c/0xe0 [ 59.046888][ T6745] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.052849][ T6745] do_syscall_64+0x60/0xe0 [ 59.057257][ T6745] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.063126][ T6745] RIP: 0033:0x7fb6b7373687 [ 59.067518][ T6745] Code: Bad RIP value. [ 59.071606][ T6745] RSP: 002b:00007ffd9d7caf28 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 59.080010][ T6745] RAX: ffffffffffffffda RBX: 0000556d16613985 RCX: 00007fb6b7373687 [ 59.087977][ T6745] RDX: 00007ffd9d7cadf0 RSI: 00000000000001ed RDI: 0000556d16613985 [ 59.095938][ T6745] RBP: 00007fb6b7373680 R08: 0000000000000100 R09: 0000000000000000 [ 59.104030][ T6745] R10: 0000556d16613980 R11: 0000000000000246 R12: 00000000000001ed [ 59.111984][ T6745] R13: 00007ffd9d7cb0b0 R14: 0000000000000000 R15: 0000000000000000 [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. 2020/06/16 17:07:51 fuzzer started 2020/06/16 17:07:51 connecting to host at 10.128.0.26:38705 2020/06/16 17:07:51 checking machine... 2020/06/16 17:07:51 checking revisions... 2020/06/16 17:07:51 testing simple program... syzkaller login: [ 63.887525][ T6825] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6825 [ 63.896728][ T6825] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.902603][ T6825] CPU: 0 PID: 6825 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 63.910857][ T6825] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.920898][ T6825] Call Trace: [ 63.924170][ T6825] dump_stack+0x18f/0x20d [ 63.928483][ T6825] check_preemption_disabled+0x20d/0x220 [ 63.934093][ T6825] ext4_mb_new_blocks+0xa4d/0x3b70 [ 63.939251][ T6825] ? ext4_ext_search_right+0x2ca/0xb20 [ 63.944809][ T6825] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 63.950537][ T6825] ext4_ext_map_blocks+0x201b/0x33e0 [ 63.955827][ T6825] ? ext4_ext_release+0x10/0x10 [ 63.960684][ T6825] ? down_write_killable+0x170/0x170 [ 63.965958][ T6825] ? ext4_es_lookup_extent+0x41d/0xd10 [ 63.971403][ T6825] ext4_map_blocks+0x4cb/0x1640 [ 63.976240][ T6825] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 63.981423][ T6825] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 63.986961][ T6825] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.993456][ T6825] ? prandom_u32_state+0xe/0x170 [ 63.998387][ T6825] ? __brelse+0x84/0xa0 [ 64.002586][ T6825] ? __ext4_new_inode+0x144/0x55e0 [ 64.007680][ T6825] ext4_getblk+0xad/0x520 [ 64.011993][ T6825] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 64.017701][ T6825] ? ext4_free_inode+0x1700/0x1700 [ 64.022800][ T6825] ext4_bread+0x7c/0x380 [ 64.027023][ T6825] ? ext4_getblk+0x520/0x520 [ 64.031610][ T6825] ? dquot_get_next_dqblk+0x180/0x180 [ 64.036961][ T6825] ext4_append+0x153/0x360 [ 64.041355][ T6825] ext4_mkdir+0x5e0/0xdf0 [ 64.045759][ T6825] ? ext4_rmdir+0xde0/0xde0 [ 64.050243][ T6825] ? security_inode_permission+0xc4/0xf0 [ 64.055868][ T6825] vfs_mkdir+0x419/0x690 [ 64.060091][ T6825] do_mkdirat+0x21e/0x280 [ 64.064398][ T6825] ? __ia32_sys_mknod+0xb0/0xb0 [ 64.069244][ T6825] ? do_syscall_64+0x1c/0xe0 [ 64.073825][ T6825] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.079791][ T6825] do_syscall_64+0x60/0xe0 [ 64.084188][ T6825] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.090057][ T6825] RIP: 0033:0x4b02a0 [ 64.093921][ T6825] Code: Bad RIP value. [ 64.097971][ T6825] RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 64.106363][ T6825] RAX: ffffffffffffffda RBX: 000000c00002e500 RCX: 00000000004b02a0 [ 64.114309][ T6825] RDX: 00000000000001c0 RSI: 000000c0000e0880 RDI: ffffffffffffff9c [ 64.122317][ T6825] RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000 [ 64.130418][ T6825] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 64.138392][ T6825] R13: 0000000000000045 R14: 0000000000000044 R15: 0000000000000100 [ 64.173955][ T6829] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6829 [ 64.183814][ T6829] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.189851][ T6829] CPU: 0 PID: 6829 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.198435][ T6829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.208522][ T6829] Call Trace: [ 64.211821][ T6829] dump_stack+0x18f/0x20d [ 64.216168][ T6829] check_preemption_disabled+0x20d/0x220 [ 64.221808][ T6829] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.226938][ T6829] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.232401][ T6829] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 64.238140][ T6829] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.243442][ T6829] ? ext4_ext_release+0x10/0x10 [ 64.248306][ T6829] ? down_write_killable+0x170/0x170 [ 64.253721][ T6829] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.259194][ T6829] ext4_map_blocks+0x4cb/0x1640 [ 64.264120][ T6829] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.269303][ T6829] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.274833][ T6829] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.280793][ T6829] ? prandom_u32_state+0xe/0x170 [ 64.285710][ T6829] ? __brelse+0x84/0xa0 [ 64.289843][ T6829] ? __ext4_new_inode+0x144/0x55e0 [ 64.294932][ T6829] ext4_getblk+0xad/0x520 [ 64.299255][ T6829] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 64.304952][ T6829] ? ext4_free_inode+0x1700/0x1700 [ 64.310052][ T6829] ext4_bread+0x7c/0x380 [ 64.314277][ T6829] ? ext4_getblk+0x520/0x520 [ 64.318856][ T6829] ? dquot_get_next_dqblk+0x180/0x180 [ 64.324222][ T6829] ext4_append+0x153/0x360 [ 64.328619][ T6829] ext4_mkdir+0x5e0/0xdf0 [ 64.332931][ T6829] ? ext4_rmdir+0xde0/0xde0 [ 64.337501][ T6829] ? security_inode_permission+0xc4/0xf0 [ 64.343112][ T6829] vfs_mkdir+0x419/0x690 [ 64.347343][ T6829] do_mkdirat+0x21e/0x280 [ 64.351665][ T6829] ? __ia32_sys_mknod+0xb0/0xb0 [ 64.356498][ T6829] ? do_syscall_64+0x1c/0xe0 [ 64.361066][ T6829] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.367377][ T6829] do_syscall_64+0x60/0xe0 [ 64.371785][ T6829] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.377686][ T6829] RIP: 0033:0x45bed7 [ 64.381566][ T6829] Code: Bad RIP value. [ 64.385611][ T6829] RSP: 002b:00007ffcc8031688 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 64.394017][ T6829] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 64.402089][ T6829] RDX: 0000000000000003 RSI: 00000000000001c0 RDI: 00007ffcc8031860 [ 64.410049][ T6829] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000003000 [ 64.418045][ T6829] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 64.426021][ T6829] R13: 00007ffcc8031860 R14: 8421084210842109 R15: 00007ffcc803186c [ 64.512492][ T6831] IPVS: ftp: loaded support on port[0] = 21 [ 64.549398][ T6831] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6831 [ 64.559501][ T6831] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.565378][ T6831] CPU: 1 PID: 6831 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.574023][ T6831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.584074][ T6831] Call Trace: [ 64.587375][ T6831] dump_stack+0x18f/0x20d [ 64.591834][ T6831] check_preemption_disabled+0x20d/0x220 [ 64.597456][ T6831] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.602575][ T6831] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.608147][ T6831] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 64.613874][ T6831] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.619169][ T6831] ? ext4_ext_release+0x10/0x10 [ 64.624011][ T6831] ? down_write_killable+0x170/0x170 [ 64.630319][ T6831] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.635778][ T6831] ext4_map_blocks+0x4cb/0x1640 [ 64.640640][ T6831] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.645815][ T6831] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.651341][ T6831] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.657394][ T6831] ? prandom_u32_state+0xe/0x170 [ 64.662310][ T6831] ? __brelse+0x84/0xa0 [ 64.666462][ T6831] ? __ext4_new_inode+0x144/0x55e0 [ 64.671572][ T6831] ext4_getblk+0xad/0x520 [ 64.676054][ T6831] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 64.681764][ T6831] ? ext4_free_inode+0x1700/0x1700 [ 64.686869][ T6831] ext4_bread+0x7c/0x380 [ 64.691088][ T6831] ? ext4_getblk+0x520/0x520 [ 64.695767][ T6831] ? dquot_get_next_dqblk+0x180/0x180 [ 64.701465][ T6831] ext4_append+0x153/0x360 [ 64.706398][ T6831] ext4_mkdir+0x5e0/0xdf0 [ 64.710719][ T6831] ? ext4_rmdir+0xde0/0xde0 [ 64.715205][ T6831] ? security_inode_permission+0xc4/0xf0 [ 64.720839][ T6831] vfs_mkdir+0x419/0x690 [ 64.725061][ T6831] do_mkdirat+0x21e/0x280 [ 64.729387][ T6831] ? __ia32_sys_mknod+0xb0/0xb0 [ 64.734214][ T6831] ? do_syscall_64+0x1c/0xe0 [ 64.738782][ T6831] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.744741][ T6831] do_syscall_64+0x60/0xe0 [ 64.749159][ T6831] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.755029][ T6831] RIP: 0033:0x45bed7 [ 64.758897][ T6831] Code: Bad RIP value. [ 64.762954][ T6831] RSP: 002b:00007ffcc8031578 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 64.771389][ T6831] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7 [ 64.779458][ T6831] RDX: 00007ffcc80315c3 RSI: 00000000000001ff RDI: 00007ffcc80315c0 [ 64.787421][ T6831] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 64.795382][ T6831] R10: 0000000000000064 R11: 0000000000000206 R12: 00000000004185c0 [ 64.803337][ T6831] R13: 00007ffcc80315b0 R14: 0000000000000000 R15: 00007ffcc80315c0 [ 64.860370][ T6831] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6831 [ 64.869956][ T6831] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.875863][ T6831] CPU: 1 PID: 6831 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.884447][ T6831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.894513][ T6831] Call Trace: [ 64.897836][ T6831] dump_stack+0x18f/0x20d [ 64.902274][ T6831] check_preemption_disabled+0x20d/0x220 [ 64.907925][ T6831] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.913057][ T6831] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.918525][ T6831] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 64.924286][ T6831] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.929622][ T6831] ? ext4_ext_release+0x10/0x10 [ 64.934696][ T6831] ? down_write_killable+0x170/0x170 [ 64.939992][ T6831] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.945464][ T6831] ext4_map_blocks+0x4cb/0x1640 [ 64.950964][ T6831] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.956174][ T6831] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.962155][ T6831] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.968122][ T6831] ? prandom_u32_state+0xe/0x170 [ 64.973046][ T6831] ? __brelse+0x84/0xa0 [ 64.977203][ T6831] ? __ext4_new_inode+0x144/0x55e0 [ 64.982301][ T6831] ext4_getblk+0xad/0x520 [ 64.986615][ T6831] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 64.992342][ T6831] ? ext4_free_inode+0x1700/0x1700 [ 64.997451][ T6831] ext4_bread+0x7c/0x380 [ 65.001676][ T6831] ? ext4_getblk+0x520/0x520 [ 65.006361][ T6831] ? dquot_get_next_dqblk+0x180/0x180 [ 65.011723][ T6831] ext4_append+0x153/0x360 [ 65.016141][ T6831] ext4_mkdir+0x5e0/0xdf0 [ 65.020482][ T6831] ? ext4_rmdir+0xde0/0xde0 [ 65.024974][ T6831] ? security_inode_permission+0xc4/0xf0 [ 65.030680][ T6831] vfs_mkdir+0x419/0x690 [ 65.036405][ T6831] do_mkdirat+0x21e/0x280 [ 65.040747][ T6831] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.045584][ T6831] ? do_syscall_64+0x1c/0xe0 [ 65.050160][ T6831] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.056222][ T6831] do_syscall_64+0x60/0xe0 [ 65.060652][ T6831] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.066522][ T6831] RIP: 0033:0x45bed7 [ 65.070390][ T6831] Code: Bad RIP value. [ 65.074430][ T6831] RSP: 002b:00007ffcc8031578 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 65.082817][ T6831] RAX: ffffffffffffffda RBX: 000000000000fd4f RCX: 000000000045bed7 [ 65.090770][ T6831] RDX: 00007ffcc80315c3 RSI: 00000000000001ff RDI: 00007ffcc80315c0 [ 65.098832][ T6831] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 2020/06/16 17:07:53 building call list... [ 65.106788][ T6831] R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000003 [ 65.114759][ T6831] R13: 00007ffcc80315b0 R14: 000000000000fd4a R15: 00007ffcc80315c0 [ 65.346445][ T158] tipc: TX() has been purged, node left! [ 65.868801][ T158] ================================================================== [ 65.877226][ T158] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 65.885390][ T158] Write of size 1 at addr ffff88809870d1e4 by task kworker/u4:3/158 [ 65.893381][ T158] [ 65.895713][ T158] CPU: 0 PID: 158 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.904026][ T158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.914168][ T158] Workqueue: netns cleanup_net [ 65.918931][ T158] Call Trace: [ 65.922222][ T158] dump_stack+0x18f/0x20d [ 65.926667][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.932209][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.937749][ T158] ? afs_put_call+0xa40/0xa40 [ 65.942428][ T158] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.949462][ T158] ? vprintk_func+0x97/0x1a6 [ 65.954057][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.959602][ T158] kasan_report.cold+0x1f/0x37 [ 65.964419][ T158] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.970047][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.975692][ T158] afs_wake_up_async_call+0x6aa/0x770 [ 65.981066][ T158] ? afs_close_socket+0x320/0x320 [ 65.986101][ T158] ? afs_put_call+0xa40/0xa40 [ 65.990785][ T158] rxrpc_notify_socket+0x1db/0x5d0 [ 65.995907][ T158] ? afs_put_call+0xa40/0xa40 [ 66.000592][ T158] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.007015][ T158] rxrpc_call_completed+0xca/0xf0 [ 66.012047][ T158] rxrpc_discard_prealloc+0x781/0xab0 [ 66.017569][ T158] ? lock_sock_nested+0x94/0x110 [ 66.022545][ T158] rxrpc_listen+0x147/0x360 [ 66.027058][ T158] afs_close_socket+0x95/0x320 [ 66.031820][ T158] ? afs_purge_servers+0x16d/0x300 [ 66.036933][ T158] ? afs_rx_discard_new_call+0x50/0x50 [ 66.042396][ T158] ? init_wait_var_entry+0x200/0x200 [ 66.047688][ T158] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.053321][ T158] ? check_preemption_disabled+0x38/0x220 [ 66.059042][ T158] afs_net_exit+0x1bc/0x310 [ 66.063542][ T158] ? afs_net_init+0xe30/0xe30 [ 66.068215][ T158] ops_exit_list.isra.0+0xa8/0x150 [ 66.073328][ T158] cleanup_net+0x511/0xa50 [ 66.077746][ T158] ? unregister_pernet_device+0x70/0x70 [ 66.083295][ T158] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.089282][ T158] process_one_work+0x965/0x1690 [ 66.094317][ T158] ? lock_release+0x800/0x800 [ 66.098992][ T158] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.104370][ T158] ? rwlock_bug.part.0+0x90/0x90 [ 66.109317][ T158] worker_thread+0x96/0xe10 [ 66.113834][ T158] ? process_one_work+0x1690/0x1690 [ 66.119036][ T158] kthread+0x3b5/0x4a0 [ 66.123101][ T158] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.128821][ T158] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.134546][ T158] ret_from_fork+0x1f/0x30 [ 66.138970][ T158] [ 66.141293][ T158] Allocated by task 6831: [ 66.145628][ T158] save_stack+0x1b/0x40 [ 66.149815][ T158] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 66.155971][ T158] kmem_cache_alloc_trace+0x153/0x7d0 [ 66.161336][ T158] afs_alloc_call+0x55/0x630 [ 66.165921][ T158] afs_charge_preallocation+0xe9/0x2d0 [ 66.171488][ T158] afs_open_socket+0x292/0x360 [ 66.176244][ T158] afs_net_init+0xa6c/0xe30 [ 66.180739][ T158] ops_init+0xaf/0x420 [ 66.184846][ T158] setup_net+0x2de/0x860 [ 66.189082][ T158] copy_net_ns+0x293/0x590 [ 66.193581][ T158] create_new_namespaces+0x3fb/0xb30 [ 66.198950][ T158] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 66.204575][ T158] ksys_unshare+0x43d/0x8e0 [ 66.209075][ T158] __x64_sys_unshare+0x2d/0x40 [ 66.213833][ T158] do_syscall_64+0x60/0xe0 [ 66.218246][ T158] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.224123][ T158] [ 66.226455][ T158] Freed by task 158: [ 66.230346][ T158] save_stack+0x1b/0x40 [ 66.234583][ T158] __kasan_slab_free+0xf7/0x140 [ 66.239430][ T158] kfree+0x109/0x2b0 [ 66.243333][ T158] afs_put_call+0x585/0xa40 [ 66.247851][ T158] rxrpc_discard_prealloc+0x764/0xab0 [ 66.253225][ T158] rxrpc_listen+0x147/0x360 [ 66.257727][ T158] afs_close_socket+0x95/0x320 [ 66.262484][ T158] afs_net_exit+0x1bc/0x310 [ 66.266983][ T158] ops_exit_list.isra.0+0xa8/0x150 [ 66.272089][ T158] cleanup_net+0x511/0xa50 [ 66.276514][ T158] process_one_work+0x965/0x1690 [ 66.281534][ T158] worker_thread+0x96/0xe10 [ 66.286032][ T158] kthread+0x3b5/0x4a0 [ 66.290096][ T158] ret_from_fork+0x1f/0x30 [ 66.294499][ T158] [ 66.296826][ T158] The buggy address belongs to the object at ffff88809870d000 [ 66.296826][ T158] which belongs to the cache kmalloc-1k of size 1024 [ 66.310873][ T158] The buggy address is located 484 bytes inside of [ 66.310873][ T158] 1024-byte region [ffff88809870d000, ffff88809870d400) [ 66.324217][ T158] The buggy address belongs to the page: [ 66.329847][ T158] page:ffffea000261c340 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.338945][ T158] flags: 0xfffe0000000200(slab) [ 66.343800][ T158] raw: 00fffe0000000200 ffffea00027f2148 ffffea0002905888 ffff8880aa000c40 [ 66.352391][ T158] raw: 0000000000000000 ffff88809870d000 0000000100000002 0000000000000000 [ 66.361049][ T158] page dumped because: kasan: bad access detected [ 66.367450][ T158] [ 66.369924][ T158] Memory state around the buggy address: [ 66.375550][ T158] ffff88809870d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.383607][ T158] ffff88809870d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.391664][ T158] >ffff88809870d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.399714][ T158] ^ [ 66.407003][ T158] ffff88809870d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.415147][ T158] ffff88809870d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.423386][ T158] ================================================================== [ 66.431454][ T158] Disabling lock debugging due to kernel taint [ 66.437676][ T158] Kernel panic - not syncing: panic_on_warn set ... [ 66.444294][ T158] CPU: 0 PID: 158 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 66.454009][ T158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.464070][ T158] Workqueue: netns cleanup_net [ 66.468830][ T158] Call Trace: [ 66.472123][ T158] dump_stack+0x18f/0x20d [ 66.476468][ T158] ? afs_wake_up_async_call+0x670/0x770 [ 66.482102][ T158] ? afs_put_call+0xa40/0xa40 [ 66.486786][ T158] panic+0x2e3/0x75c [ 66.490692][ T158] ? __warn_printk+0xf3/0xf3 [ 66.495283][ T158] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 66.501445][ T158] ? trace_hardirqs_on+0x55/0x220 [ 66.506901][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.512691][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.518434][ T158] ? afs_put_call+0xa40/0xa40 [ 66.523113][ T158] end_report+0x4d/0x53 [ 66.527850][ T158] kasan_report.cold+0xd/0x37 [ 66.532554][ T158] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.538185][ T158] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.543714][ T158] afs_wake_up_async_call+0x6aa/0x770 [ 66.549078][ T158] ? afs_close_socket+0x320/0x320 [ 66.554090][ T158] ? afs_put_call+0xa40/0xa40 [ 66.558860][ T158] rxrpc_notify_socket+0x1db/0x5d0 [ 66.563955][ T158] ? afs_put_call+0xa40/0xa40 [ 66.568726][ T158] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.575131][ T158] rxrpc_call_completed+0xca/0xf0 [ 66.580143][ T158] rxrpc_discard_prealloc+0x781/0xab0 [ 66.585534][ T158] ? lock_sock_nested+0x94/0x110 [ 66.590474][ T158] rxrpc_listen+0x147/0x360 [ 66.594969][ T158] afs_close_socket+0x95/0x320 [ 66.599727][ T158] ? afs_purge_servers+0x16d/0x300 [ 66.604838][ T158] ? afs_rx_discard_new_call+0x50/0x50 [ 66.610391][ T158] ? init_wait_var_entry+0x200/0x200 [ 66.615806][ T158] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.621435][ T158] ? check_preemption_disabled+0x38/0x220 [ 66.627203][ T158] afs_net_exit+0x1bc/0x310 [ 66.631712][ T158] ? afs_net_init+0xe30/0xe30 [ 66.636526][ T158] ops_exit_list.isra.0+0xa8/0x150 [ 66.641639][ T158] cleanup_net+0x511/0xa50 [ 66.646049][ T158] ? unregister_pernet_device+0x70/0x70 [ 66.651637][ T158] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.657766][ T158] process_one_work+0x965/0x1690 [ 66.662730][ T158] ? lock_release+0x800/0x800 [ 66.667397][ T158] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.672761][ T158] ? rwlock_bug.part.0+0x90/0x90 [ 66.677696][ T158] worker_thread+0x96/0xe10 [ 66.682541][ T158] ? process_one_work+0x1690/0x1690 [ 66.687819][ T158] kthread+0x3b5/0x4a0 [ 66.691881][ T158] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.697615][ T158] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.703329][ T158] ret_from_fork+0x1f/0x30 [ 66.709188][ T158] Kernel Offset: disabled [ 66.713506][ T158] Rebooting in 86400 seconds..