[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ 53.601491][ T6734] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6734 [ 53.610941][ T6734] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 53.616825][ T6734] CPU: 0 PID: 6734 Comm: systemd-rfkill Not tainted 5.7.0-syzkaller #0 [ 53.625044][ T6734] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.635175][ T6734] Call Trace: [ 53.638467][ T6734] dump_stack+0x18f/0x20d [ 53.642890][ T6734] check_preemption_disabled+0x20d/0x220 [ 53.648510][ T6734] ext4_mb_new_blocks+0xa4d/0x3b70 [ 53.655797][ T6734] ? ext4_ext_search_right+0x2ca/0xb20 [ 53.661255][ T6734] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 53.667076][ T6734] ext4_ext_map_blocks+0x201b/0x33e0 [ 53.672366][ T6734] ? ext4_ext_release+0x10/0x10 [ 53.677206][ T6734] ? down_write_killable+0x170/0x170 [ 53.682475][ T6734] ? ext4_es_lookup_extent+0x41d/0xd10 [ 53.687919][ T6734] ext4_map_blocks+0x4cb/0x1640 [ 53.692769][ T6734] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 53.697944][ T6734] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 53.703478][ T6734] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 53.709436][ T6734] ? prandom_u32_state+0xe/0x170 [ 53.714479][ T6734] ? __brelse+0x84/0xa0 [ 53.718669][ T6734] ? __ext4_new_inode+0x144/0x55e0 [ 53.723772][ T6734] ext4_getblk+0xad/0x520 [ 53.728102][ T6734] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 53.733817][ T6734] ? ext4_free_inode+0x1700/0x1700 [ 53.738909][ T6734] ext4_bread+0x7c/0x380 [ 53.743129][ T6734] ? ext4_getblk+0x520/0x520 [ 53.747712][ T6734] ? dquot_get_next_dqblk+0x180/0x180 [ 53.753096][ T6734] ext4_append+0x153/0x360 [ 53.757495][ T6734] ext4_mkdir+0x5e0/0xdf0 [ 53.761819][ T6734] ? ext4_rmdir+0xde0/0xde0 [ 53.766311][ T6734] ? security_inode_permission+0xc4/0xf0 [ 53.773504][ T6734] vfs_mkdir+0x419/0x690 [ 53.777739][ T6734] do_mkdirat+0x21e/0x280 [ 53.782058][ T6734] ? __ia32_sys_mknod+0xb0/0xb0 [ 53.786891][ T6734] ? do_syscall_64+0x1c/0xe0 [ 53.791470][ T6734] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 53.797458][ T6734] do_syscall_64+0x60/0xe0 [ 53.801860][ T6734] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.807739][ T6734] RIP: 0033:0x7f209e0bb687 [ 53.812131][ T6734] Code: Bad RIP value. [ 53.816189][ T6734] RSP: 002b:00007ffc46c18348 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 53.824601][ T6734] RAX: ffffffffffffffda RBX: 000056489b487985 RCX: 00007f209e0bb687 [ 53.832553][ T6734] RDX: 00007ffc46c18210 RSI: 00000000000001ed RDI: 000056489b487985 [ 53.840512][ T6734] RBP: 00007f209e0bb680 R08: 0000000000000100 R09: 0000000000000000 [ 53.848472][ T6734] R10: 000056489b487980 R11: 0000000000000246 R12: 00000000000001ed [ 53.856434][ T6734] R13: 00007ffc46c184d0 R14: 0000000000000000 R15: 0000000000000000 [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 56.146996][ T6768] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/6768 [ 56.156333][ T6768] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 56.162366][ T6768] CPU: 0 PID: 6768 Comm: kworker/u4:6 Not tainted 5.7.0-syzkaller #0 [ 56.170427][ T6768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.181190][ T6768] Workqueue: writeback wb_workfn (flush-8:0) [ 56.188373][ T6768] Call Trace: [ 56.191659][ T6768] dump_stack+0x18f/0x20d [ 56.195973][ T6768] check_preemption_disabled+0x20d/0x220 [ 56.201611][ T6768] ext4_mb_new_blocks+0xa4d/0x3b70 [ 56.206701][ T6768] ? ext4_find_extent+0x81a/0xad0 [ 56.211718][ T6768] ? ext4_ext_search_right+0x2ca/0xb20 [ 56.217166][ T6768] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 56.222968][ T6768] ext4_ext_map_blocks+0x201b/0x33e0 [ 56.228323][ T6768] ? ext4_ext_release+0x10/0x10 [ 56.233163][ T6768] ? down_write_killable+0x170/0x170 [ 56.238427][ T6768] ? ext4_es_lookup_extent+0x41d/0xd10 [ 56.243986][ T6768] ext4_map_blocks+0x4cb/0x1640 [ 56.248818][ T6768] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 56.253998][ T6768] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.259520][ T6768] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.265476][ T6768] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 56.270918][ T6768] ext4_writepages+0x1a7b/0x33c0 [ 56.275859][ T6768] ? __ext4_mark_inode_dirty+0x940/0x940 [ 56.281467][ T6768] ? __lock_acquire+0x2224/0x48b0 [ 56.286491][ T6768] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 56.292449][ T6768] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 56.298407][ T6768] ? __ext4_mark_inode_dirty+0x940/0x940 [ 56.304016][ T6768] ? do_writepages+0xfa/0x2a0 [ 56.308683][ T6768] do_writepages+0xfa/0x2a0 [ 56.313446][ T6768] ? page_writeback_cpu_online+0x10/0x10 [ 56.319343][ T6768] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.324906][ T6768] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.330870][ T6768] ? lock_downgrade+0x840/0x840 [ 56.335725][ T6768] __writeback_single_inode+0x12a/0x13d0 [ 56.341362][ T6768] ? _raw_spin_unlock+0x24/0x40 [ 56.346212][ T6768] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 56.352275][ T6768] writeback_sb_inodes+0x515/0xdc0 [ 56.357692][ T6768] ? __writeback_single_inode+0x13d0/0x13d0 [ 56.363771][ T6768] __writeback_inodes_wb+0xc3/0x250 [ 56.368959][ T6768] wb_writeback+0x8db/0xd50 [ 56.373445][ T6768] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 56.379755][ T6768] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 56.385643][ T6768] ? cpumask_next+0x3c/0x40 [ 56.390138][ T6768] ? get_nr_dirty_inodes+0xd6/0x130 [ 56.395325][ T6768] wb_workfn+0xab3/0x1090 [ 56.399659][ T6768] ? inode_wait_for_writeback+0x30/0x30 [ 56.405186][ T6768] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.410729][ T6768] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.416745][ T6768] process_one_work+0x965/0x1690 [ 56.421750][ T6768] ? lock_release+0x800/0x800 [ 56.426506][ T6768] ? pwq_dec_nr_in_flight+0x310/0x310 [ 56.431861][ T6768] ? rwlock_bug.part.0+0x90/0x90 [ 56.436781][ T6768] worker_thread+0x96/0xe10 [ 56.441787][ T6768] ? process_one_work+0x1690/0x1690 [ 56.447024][ T6768] kthread+0x3b5/0x4a0 [ 56.451187][ T6768] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 56.456902][ T6768] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 56.462607][ T6768] ret_from_fork+0x1f/0x30 Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. 2020/06/15 06:09:45 fuzzer started 2020/06/15 06:09:45 connecting to host at 10.128.0.26:38061 2020/06/15 06:09:45 checking machine... 2020/06/15 06:09:45 checking revisions... 2020/06/15 06:09:45 testing simple program... [ 58.835843][ T6823] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6823 [ 58.844893][ T6823] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 58.851076][ T6823] CPU: 1 PID: 6823 Comm: syz-fuzzer Not tainted 5.7.0-syzkaller #0 [ 58.858976][ T6823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.869025][ T6823] Call Trace: [ 58.872299][ T6823] dump_stack+0x18f/0x20d [ 58.876610][ T6823] check_preemption_disabled+0x20d/0x220 [ 58.882220][ T6823] ext4_mb_new_blocks+0xa4d/0x3b70 [ 58.887332][ T6823] ? ext4_ext_search_right+0x2ca/0xb20 [ 58.892776][ T6823] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 58.898483][ T6823] ext4_ext_map_blocks+0x201b/0x33e0 [ 58.903753][ T6823] ? ext4_ext_release+0x10/0x10 [ 58.908593][ T6823] ? down_write_killable+0x170/0x170 [ 58.913908][ T6823] ? ext4_es_lookup_extent+0x41d/0xd10 [ 58.919350][ T6823] ext4_map_blocks+0x4cb/0x1640 [ 58.924185][ T6823] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 58.929456][ T6823] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 58.935220][ T6823] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 58.942378][ T6823] ? prandom_u32_state+0xe/0x170 [ 58.947302][ T6823] ? __brelse+0x84/0xa0 [ 58.951447][ T6823] ? __ext4_new_inode+0x144/0x55e0 [ 58.957497][ T6823] ext4_getblk+0xad/0x520 [ 58.961817][ T6823] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 58.967517][ T6823] ? ext4_free_inode+0x1700/0x1700 [ 58.972604][ T6823] ext4_bread+0x7c/0x380 [ 58.976823][ T6823] ? ext4_getblk+0x520/0x520 [ 58.981388][ T6823] ? dquot_get_next_dqblk+0x180/0x180 [ 58.986826][ T6823] ext4_append+0x153/0x360 [ 58.991223][ T6823] ext4_mkdir+0x5e0/0xdf0 [ 58.995553][ T6823] ? ext4_rmdir+0xde0/0xde0 [ 59.000122][ T6823] ? security_inode_permission+0xc4/0xf0 [ 59.005751][ T6823] vfs_mkdir+0x419/0x690 [ 59.009984][ T6823] do_mkdirat+0x21e/0x280 [ 59.014313][ T6823] ? __ia32_sys_mknod+0xb0/0xb0 [ 59.019195][ T6823] ? do_syscall_64+0x1c/0xe0 [ 59.023767][ T6823] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.029924][ T6823] do_syscall_64+0x60/0xe0 [ 59.034331][ T6823] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.040736][ T6823] RIP: 0033:0x4b02a0 [ 59.044606][ T6823] Code: Bad RIP value. [ 59.048650][ T6823] RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 59.057039][ T6823] RAX: ffffffffffffffda RBX: 000000c00002e500 RCX: 00000000004b02a0 [ 59.064990][ T6823] RDX: 00000000000001c0 RSI: 000000c00009cae0 RDI: ffffffffffffff9c [ 59.072938][ T6823] RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000 [ 59.080890][ T6823] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 59.088841][ T6823] R13: 0000000000000058 R14: 0000000000000057 R15: 0000000000000100 [ 59.145214][ T6827] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6827 [ 59.154634][ T6827] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.160691][ T6827] CPU: 1 PID: 6827 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 59.168930][ T6827] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.179401][ T6827] Call Trace: [ 59.182675][ T6827] dump_stack+0x18f/0x20d [ 59.187001][ T6827] check_preemption_disabled+0x20d/0x220 [ 59.192703][ T6827] ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.197806][ T6827] ? ext4_ext_search_right+0x2ca/0xb20 [ 59.203248][ T6827] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 59.208963][ T6827] ext4_ext_map_blocks+0x201b/0x33e0 [ 59.214230][ T6827] ? ext4_ext_release+0x10/0x10 [ 59.219068][ T6827] ? down_write_killable+0x170/0x170 [ 59.224329][ T6827] ? ext4_es_lookup_extent+0x41d/0xd10 [ 59.229769][ T6827] ext4_map_blocks+0x4cb/0x1640 [ 59.234614][ T6827] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 59.239800][ T6827] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 59.245326][ T6827] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.251281][ T6827] ? prandom_u32_state+0xe/0x170 [ 59.256206][ T6827] ? __brelse+0x84/0xa0 [ 59.260347][ T6827] ? __ext4_new_inode+0x144/0x55e0 [ 59.265439][ T6827] ext4_getblk+0xad/0x520 [ 59.269744][ T6827] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 59.275443][ T6827] ? ext4_free_inode+0x1700/0x1700 [ 59.280540][ T6827] ext4_bread+0x7c/0x380 [ 59.284767][ T6827] ? ext4_getblk+0x520/0x520 [ 59.289406][ T6827] ? dquot_get_next_dqblk+0x180/0x180 [ 59.294765][ T6827] ext4_append+0x153/0x360 [ 59.299169][ T6827] ext4_mkdir+0x5e0/0xdf0 [ 59.303483][ T6827] ? ext4_rmdir+0xde0/0xde0 [ 59.307978][ T6827] ? security_inode_permission+0xc4/0xf0 [ 59.314148][ T6827] vfs_mkdir+0x419/0x690 [ 59.318403][ T6827] do_mkdirat+0x21e/0x280 [ 59.322717][ T6827] ? __ia32_sys_mknod+0xb0/0xb0 [ 59.327600][ T6827] ? do_syscall_64+0x1c/0xe0 [ 59.332178][ T6827] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.338150][ T6827] do_syscall_64+0x60/0xe0 [ 59.342560][ T6827] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.348427][ T6827] RIP: 0033:0x45bee7 [ 59.352305][ T6827] Code: Bad RIP value. [ 59.356349][ T6827] RSP: 002b:00007fff3bbf8658 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 59.364736][ T6827] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bee7 [ 59.372685][ T6827] RDX: 0000000000000002 RSI: 00000000000001c0 RDI: 00007fff3bbf8830 [ 59.380631][ T6827] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000002d40 [ 59.388593][ T6827] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 59.396552][ T6827] R13: 00007fff3bbf8830 R14: 8421084210842109 R15: 00007fff3bbf883c [ 59.481202][ T6828] IPVS: ftp: loaded support on port[0] = 21 [ 59.517578][ T6828] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6828 [ 59.527239][ T6828] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.533119][ T6828] CPU: 0 PID: 6828 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 59.541436][ T6828] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.551467][ T6828] Call Trace: [ 59.554740][ T6828] dump_stack+0x18f/0x20d [ 59.559158][ T6828] check_preemption_disabled+0x20d/0x220 [ 59.564777][ T6828] ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.569884][ T6828] ? ext4_ext_search_right+0x2ca/0xb20 [ 59.575322][ T6828] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 59.581035][ T6828] ext4_ext_map_blocks+0x201b/0x33e0 [ 59.586305][ T6828] ? ext4_ext_release+0x10/0x10 [ 59.591238][ T6828] ? down_write_killable+0x170/0x170 [ 59.596506][ T6828] ? ext4_es_lookup_extent+0x41d/0xd10 [ 59.601944][ T6828] ext4_map_blocks+0x4cb/0x1640 [ 59.606787][ T6828] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 59.611962][ T6828] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 59.617486][ T6828] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.623441][ T6828] ? prandom_u32_state+0xe/0x170 [ 59.628371][ T6828] ? __brelse+0x84/0xa0 [ 59.632504][ T6828] ? __ext4_new_inode+0x144/0x55e0 [ 59.637608][ T6828] ext4_getblk+0xad/0x520 [ 59.641917][ T6828] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 59.647615][ T6828] ? ext4_free_inode+0x1700/0x1700 [ 59.652712][ T6828] ext4_bread+0x7c/0x380 [ 59.656947][ T6828] ? ext4_getblk+0x520/0x520 [ 59.661513][ T6828] ? dquot_get_next_dqblk+0x180/0x180 [ 59.666877][ T6828] ext4_append+0x153/0x360 [ 59.671292][ T6828] ext4_mkdir+0x5e0/0xdf0 [ 59.675606][ T6828] ? ext4_rmdir+0xde0/0xde0 [ 59.680085][ T6828] ? security_inode_permission+0xc4/0xf0 [ 59.685958][ T6828] vfs_mkdir+0x419/0x690 [ 59.690182][ T6828] do_mkdirat+0x21e/0x280 [ 59.694488][ T6828] ? __ia32_sys_mknod+0xb0/0xb0 [ 59.699323][ T6828] ? do_syscall_64+0x1c/0xe0 [ 59.703893][ T6828] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.709865][ T6828] do_syscall_64+0x60/0xe0 [ 59.714262][ T6828] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.720145][ T6828] RIP: 0033:0x45bee7 [ 59.724067][ T6828] Code: Bad RIP value. [ 59.728212][ T6828] RSP: 002b:00007fff3bbf8548 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 59.736600][ T6828] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bee7 [ 59.744692][ T6828] RDX: 00007fff3bbf8593 RSI: 00000000000001ff RDI: 00007fff3bbf8590 [ 59.752659][ T6828] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 59.760616][ T6828] R10: 0000000000000064 R11: 0000000000000206 R12: 00000000004185d0 [ 59.768580][ T6828] R13: 00007fff3bbf8580 R14: 0000000000000000 R15: 00007fff3bbf8590 [ 59.833682][ T6828] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6828 [ 59.843524][ T6828] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.849623][ T6828] CPU: 1 PID: 6828 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 59.857891][ T6828] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.867944][ T6828] Call Trace: [ 59.871239][ T6828] dump_stack+0x18f/0x20d [ 59.875654][ T6828] check_preemption_disabled+0x20d/0x220 [ 59.881267][ T6828] ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.886363][ T6828] ? ext4_ext_search_right+0x2ca/0xb20 [ 59.891795][ T6828] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 59.897565][ T6828] ext4_ext_map_blocks+0x201b/0x33e0 [ 59.902843][ T6828] ? ext4_ext_release+0x10/0x10 [ 59.907680][ T6828] ? down_write_killable+0x170/0x170 [ 59.912939][ T6828] ? ext4_es_lookup_extent+0x41d/0xd10 [ 59.918377][ T6828] ext4_map_blocks+0x4cb/0x1640 [ 59.923223][ T6828] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 59.929427][ T6828] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 59.934970][ T6828] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.941085][ T6828] ? prandom_u32_state+0xe/0x170 [ 59.946006][ T6828] ? __brelse+0x84/0xa0 [ 59.950141][ T6828] ? __ext4_new_inode+0x144/0x55e0 [ 59.955231][ T6828] ext4_getblk+0xad/0x520 [ 59.959539][ T6828] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 59.965252][ T6828] ? ext4_free_inode+0x1700/0x1700 [ 59.970339][ T6828] ext4_bread+0x7c/0x380 [ 59.974572][ T6828] ? ext4_getblk+0x520/0x520 [ 59.979137][ T6828] ? dquot_get_next_dqblk+0x180/0x180 [ 59.984496][ T6828] ext4_append+0x153/0x360 [ 59.988901][ T6828] ext4_mkdir+0x5e0/0xdf0 [ 59.995035][ T6828] ? ext4_rmdir+0xde0/0xde0 [ 59.999520][ T6828] ? security_inode_permission+0xc4/0xf0 [ 60.005225][ T6828] vfs_mkdir+0x419/0x690 [ 60.009544][ T6828] do_mkdirat+0x21e/0x280 [ 60.013860][ T6828] ? __ia32_sys_mknod+0xb0/0xb0 [ 60.018690][ T6828] ? do_syscall_64+0x1c/0xe0 [ 60.023275][ T6828] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.029236][ T6828] do_syscall_64+0x60/0xe0 [ 60.033681][ T6828] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.039561][ T6828] RIP: 0033:0x45bee7 [ 60.043424][ T6828] Code: Bad RIP value. [ 60.047465][ T6828] RSP: 002b:00007fff3bbf8548 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 60.055850][ T6828] RAX: ffffffffffffffda RBX: 000000000000e99f RCX: 000000000045bee7 [ 60.063796][ T6828] RDX: 00007fff3bbf8593 RSI: 00000000000001ff RDI: 00007fff3bbf8590 [ 60.071829][ T6828] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 2020/06/15 06:09:47 building call list... [ 60.079778][ T6828] R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000003 [ 60.087813][ T6828] R13: 00007fff3bbf8580 R14: 000000000000e99a R15: 00007fff3bbf8590 [ 60.364840][ T6768] tipc: TX() has been purged, node left! [ 60.896905][ T6768] ================================================================== [ 60.905125][ T6768] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 60.913014][ T6768] Write of size 1 at addr ffff888091d7b1e4 by task kworker/u4:6/6768 [ 60.921059][ T6768] [ 60.923388][ T6768] CPU: 0 PID: 6768 Comm: kworker/u4:6 Not tainted 5.7.0-syzkaller #0 [ 60.931536][ T6768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.941591][ T6768] Workqueue: netns cleanup_net [ 60.946355][ T6768] Call Trace: [ 60.949650][ T6768] dump_stack+0x18f/0x20d [ 60.954943][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.960502][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.966041][ T6768] ? afs_put_call+0xa40/0xa40 [ 60.970714][ T6768] print_address_description.constprop.0.cold+0xd3/0x413 [ 60.977737][ T6768] ? vprintk_func+0x97/0x1a6 [ 60.982350][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.987908][ T6768] kasan_report.cold+0x1f/0x37 [ 60.992669][ T6768] ? rcu_read_lock_held+0x81/0xb0 [ 60.997686][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.003234][ T6768] afs_wake_up_async_call+0x6aa/0x770 [ 61.008612][ T6768] ? afs_close_socket+0x320/0x320 [ 61.013634][ T6768] ? afs_put_call+0xa40/0xa40 [ 61.018363][ T6768] rxrpc_notify_socket+0x1db/0x5d0 [ 61.023486][ T6768] ? afs_put_call+0xa40/0xa40 [ 61.028158][ T6768] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.034572][ T6768] rxrpc_call_completed+0xca/0xf0 [ 61.039596][ T6768] rxrpc_discard_prealloc+0x781/0xab0 [ 61.044966][ T6768] ? lock_sock_nested+0x94/0x110 [ 61.051811][ T6768] rxrpc_listen+0x147/0x360 [ 61.056311][ T6768] afs_close_socket+0x95/0x320 [ 61.061068][ T6768] ? afs_purge_servers+0x16d/0x300 [ 61.066356][ T6768] ? afs_rx_discard_new_call+0x50/0x50 [ 61.071853][ T6768] ? init_wait_var_entry+0x200/0x200 [ 61.077155][ T6768] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.082802][ T6768] ? check_preemption_disabled+0x38/0x220 [ 61.088535][ T6768] afs_net_exit+0x1bc/0x310 [ 61.093037][ T6768] ? afs_net_init+0xe30/0xe30 [ 61.097709][ T6768] ops_exit_list.isra.0+0xa8/0x150 [ 61.102817][ T6768] cleanup_net+0x511/0xa50 [ 61.107236][ T6768] ? unregister_pernet_device+0x70/0x70 [ 61.112780][ T6768] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.118764][ T6768] process_one_work+0x965/0x1690 [ 61.123724][ T6768] ? lock_release+0x800/0x800 [ 61.128408][ T6768] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.133781][ T6768] ? rwlock_bug.part.0+0x90/0x90 [ 61.138737][ T6768] worker_thread+0x96/0xe10 [ 61.143264][ T6768] ? process_one_work+0x1690/0x1690 [ 61.148468][ T6768] kthread+0x3b5/0x4a0 [ 61.152536][ T6768] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.158244][ T6768] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.163956][ T6768] ret_from_fork+0x1f/0x30 [ 61.168377][ T6768] [ 61.170698][ T6768] Allocated by task 6828: [ 61.175023][ T6768] save_stack+0x1b/0x40 [ 61.179162][ T6768] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.184782][ T6768] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.190148][ T6768] afs_alloc_call+0x55/0x630 [ 61.194731][ T6768] afs_charge_preallocation+0xe9/0x2d0 [ 61.200181][ T6768] afs_open_socket+0x292/0x360 [ 61.204945][ T6768] afs_net_init+0xa6c/0xe30 [ 61.209431][ T6768] ops_init+0xaf/0x420 [ 61.213479][ T6768] setup_net+0x2de/0x860 [ 61.217701][ T6768] copy_net_ns+0x293/0x590 [ 61.222104][ T6768] create_new_namespaces+0x3fb/0xb30 [ 61.227365][ T6768] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.232976][ T6768] ksys_unshare+0x43d/0x8e0 [ 61.237468][ T6768] __x64_sys_unshare+0x2d/0x40 [ 61.242219][ T6768] do_syscall_64+0x60/0xe0 [ 61.246684][ T6768] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.252574][ T6768] [ 61.254892][ T6768] Freed by task 6768: [ 61.259091][ T6768] save_stack+0x1b/0x40 [ 61.263349][ T6768] __kasan_slab_free+0xf7/0x140 [ 61.268189][ T6768] kfree+0x109/0x2b0 [ 61.272077][ T6768] afs_put_call+0x585/0xa40 [ 61.276620][ T6768] rxrpc_discard_prealloc+0x764/0xab0 [ 61.282057][ T6768] rxrpc_listen+0x147/0x360 [ 61.286557][ T6768] afs_close_socket+0x95/0x320 [ 61.291326][ T6768] afs_net_exit+0x1bc/0x310 [ 61.295835][ T6768] ops_exit_list.isra.0+0xa8/0x150 [ 61.300939][ T6768] cleanup_net+0x511/0xa50 [ 61.305343][ T6768] process_one_work+0x965/0x1690 [ 61.310395][ T6768] worker_thread+0x96/0xe10 [ 61.314900][ T6768] kthread+0x3b5/0x4a0 [ 61.318969][ T6768] ret_from_fork+0x1f/0x30 [ 61.323499][ T6768] [ 61.325940][ T6768] The buggy address belongs to the object at ffff888091d7b000 [ 61.325940][ T6768] which belongs to the cache kmalloc-1k of size 1024 [ 61.340183][ T6768] The buggy address is located 484 bytes inside of [ 61.340183][ T6768] 1024-byte region [ffff888091d7b000, ffff888091d7b400) [ 61.353524][ T6768] The buggy address belongs to the page: [ 61.359161][ T6768] page:ffffea0002475ec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.368459][ T6768] flags: 0xfffe0000000200(slab) [ 61.373402][ T6768] raw: 00fffe0000000200 ffffea000269a888 ffffea0002437048 ffff8880aa000c40 [ 61.381983][ T6768] raw: 0000000000000000 ffff888091d7b000 0000000100000002 0000000000000000 [ 61.390553][ T6768] page dumped because: kasan: bad access detected [ 61.396948][ T6768] [ 61.399301][ T6768] Memory state around the buggy address: [ 61.404951][ T6768] ffff888091d7b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.413093][ T6768] ffff888091d7b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.421448][ T6768] >ffff888091d7b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.429514][ T6768] ^ [ 61.436710][ T6768] ffff888091d7b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.444770][ T6768] ffff888091d7b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.452977][ T6768] ================================================================== [ 61.461035][ T6768] Disabling lock debugging due to kernel taint [ 61.467267][ T6768] Kernel panic - not syncing: panic_on_warn set ... [ 61.473895][ T6768] CPU: 0 PID: 6768 Comm: kworker/u4:6 Tainted: G B 5.7.0-syzkaller #0 [ 61.483335][ T6768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.493385][ T6768] Workqueue: netns cleanup_net [ 61.498151][ T6768] Call Trace: [ 61.501439][ T6768] dump_stack+0x18f/0x20d [ 61.505769][ T6768] ? afs_wake_up_async_call+0x5f0/0x770 [ 61.511316][ T6768] ? afs_put_call+0xa40/0xa40 [ 61.516088][ T6768] panic+0x2e3/0x75c [ 61.519977][ T6768] ? __warn_printk+0xf3/0xf3 [ 61.524686][ T6768] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.530834][ T6768] ? trace_hardirqs_on+0x55/0x220 [ 61.535885][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.541424][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.546957][ T6768] ? afs_put_call+0xa40/0xa40 [ 61.551622][ T6768] end_report+0x4d/0x53 [ 61.555769][ T6768] kasan_report.cold+0xd/0x37 [ 61.560444][ T6768] ? rcu_read_lock_held+0x81/0xb0 [ 61.565456][ T6768] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.570989][ T6768] afs_wake_up_async_call+0x6aa/0x770 [ 61.576365][ T6768] ? afs_close_socket+0x320/0x320 [ 61.581376][ T6768] ? afs_put_call+0xa40/0xa40 [ 61.586045][ T6768] rxrpc_notify_socket+0x1db/0x5d0 [ 61.591149][ T6768] ? afs_put_call+0xa40/0xa40 [ 61.595817][ T6768] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.602482][ T6768] rxrpc_call_completed+0xca/0xf0 [ 61.607531][ T6768] rxrpc_discard_prealloc+0x781/0xab0 [ 61.612914][ T6768] ? lock_sock_nested+0x94/0x110 [ 61.617844][ T6768] rxrpc_listen+0x147/0x360 [ 61.623379][ T6768] afs_close_socket+0x95/0x320 [ 61.628150][ T6768] ? afs_purge_servers+0x16d/0x300 [ 61.633252][ T6768] ? afs_rx_discard_new_call+0x50/0x50 [ 61.638718][ T6768] ? init_wait_var_entry+0x200/0x200 [ 61.643994][ T6768] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.649615][ T6768] ? check_preemption_disabled+0x38/0x220 [ 61.655328][ T6768] afs_net_exit+0x1bc/0x310 [ 61.659820][ T6768] ? afs_net_init+0xe30/0xe30 [ 61.664570][ T6768] ops_exit_list.isra.0+0xa8/0x150 [ 61.669667][ T6768] cleanup_net+0x511/0xa50 [ 61.674072][ T6768] ? unregister_pernet_device+0x70/0x70 [ 61.679616][ T6768] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.686024][ T6768] process_one_work+0x965/0x1690 [ 61.690956][ T6768] ? lock_release+0x800/0x800 [ 61.695623][ T6768] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.700997][ T6768] ? rwlock_bug.part.0+0x90/0x90 [ 61.705925][ T6768] worker_thread+0x96/0xe10 [ 61.710423][ T6768] ? process_one_work+0x1690/0x1690 [ 61.715608][ T6768] kthread+0x3b5/0x4a0 [ 61.719666][ T6768] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.725371][ T6768] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.731082][ T6768] ret_from_fork+0x1f/0x30 [ 61.736853][ T6768] Kernel Offset: disabled [ 61.741388][ T6768] Rebooting in 86400 seconds..