[ 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. Starting Load/Save RF Kill Switch Status... [ 60.125875][ T6727] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6727 [ 60.135537][ T6727] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 60.141793][ T6727] CPU: 1 PID: 6727 Comm: systemd-rfkill Not tainted 5.8.0-rc1-syzkaller #0 [ 60.150480][ T6727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.160517][ T6727] Call Trace: [ 60.163798][ T6727] dump_stack+0x18f/0x20d [ 60.168118][ T6727] check_preemption_disabled+0x20d/0x220 [ 60.173760][ T6727] ext4_mb_new_blocks+0xa4d/0x3b70 [ 60.178867][ T6727] ? ext4_ext_search_right+0x2ca/0xb20 [ 60.184318][ T6727] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 60.190022][ T6727] ext4_ext_map_blocks+0x201b/0x33e0 [ 60.196426][ T6727] ? ext4_ext_release+0x10/0x10 [ 60.201267][ T6727] ? down_write_killable+0x170/0x170 [ 60.206551][ T6727] ? ext4_es_lookup_extent+0x41d/0xd10 [ 60.211999][ T6727] ext4_map_blocks+0x4cb/0x1640 [ 60.216849][ T6727] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 60.222045][ T6727] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.227572][ T6727] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.233532][ T6727] ? prandom_u32_state+0xe/0x170 [ 60.238469][ T6727] ? __brelse+0x84/0xa0 [ 60.242601][ T6727] ? __ext4_new_inode+0x144/0x55e0 [ 60.247690][ T6727] ext4_getblk+0xad/0x520 [ 60.252001][ T6727] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 60.257700][ T6727] ? ext4_free_inode+0x1700/0x1700 [ 60.262792][ T6727] ext4_bread+0x7c/0x380 [ 60.267013][ T6727] ? ext4_getblk+0x520/0x520 [ 60.271945][ T6727] ? dquot_get_next_dqblk+0x180/0x180 [ 60.271978][ T6727] ext4_append+0x153/0x360 [ 60.271999][ T6727] ext4_mkdir+0x5e0/0xdf0 [ 60.272024][ T6727] ? ext4_rmdir+0xde0/0xde0 [ 60.272044][ T6727] ? security_inode_permission+0xc4/0xf0 [ 60.272069][ T6727] vfs_mkdir+0x419/0x690 [ 60.272089][ T6727] do_mkdirat+0x21e/0x280 [ 60.272109][ T6727] ? __ia32_sys_mknod+0xb0/0xb0 [ 60.272127][ T6727] ? do_syscall_64+0x1c/0xe0 [ 60.272145][ T6727] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.272165][ T6727] do_syscall_64+0x60/0xe0 [ 60.272184][ T6727] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.272198][ T6727] RIP: 0033:0x7f811563b687 [ 60.272204][ T6727] Code: Bad RIP value. [ 60.272213][ T6727] RSP: 002b:00007ffc724aea28 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 60.272228][ T6727] RAX: ffffffffffffffda RBX: 000056155616b985 RCX: 00007f811563b687 [ 60.272237][ T6727] RDX: 00007ffc724ae8f0 RSI: 00000000000001ed RDI: 000056155616b985 [ 60.272247][ T6727] RBP: 00007f811563b680 R08: 0000000000000100 R09: 0000000000000000 [ 60.272256][ T6727] R10: 000056155616b980 R11: 0000000000000246 R12: 00000000000001ed [ 60.272266][ T6727] R13: 00007ffc724aebb0 R14: 0000000000000000 R15: 0000000000000000 [ 61.099221][ T7] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:0/7 [ 61.108587][ T7] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 61.114478][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.122612][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.132673][ T7] Workqueue: writeback wb_workfn (flush-8:0) [ 61.138628][ T7] Call Trace: [ 61.141905][ T7] dump_stack+0x18f/0x20d [ 61.146220][ T7] check_preemption_disabled+0x20d/0x220 [ 61.151847][ T7] ext4_mb_new_blocks+0xa4d/0x3b70 [ 61.156938][ T7] ? ext4_find_extent+0x81a/0xad0 [ 61.161960][ T7] ? ext4_ext_search_right+0x2ca/0xb20 [ 61.167524][ T7] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 61.173416][ T7] ext4_ext_map_blocks+0x201b/0x33e0 [ 61.179044][ T7] ? ext4_ext_release+0x10/0x10 [ 61.183928][ T7] ? down_write_killable+0x170/0x170 [ 61.189230][ T7] ? ext4_es_lookup_extent+0x41d/0xd10 [ 61.195491][ T7] ext4_map_blocks+0x4cb/0x1640 [ 61.200333][ T7] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 61.205534][ T7] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.211064][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.217110][ T7] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 61.222549][ T7] ext4_writepages+0x1a7b/0x33c0 [ 61.227480][ T7] ? __ext4_mark_inode_dirty+0x940/0x940 [ 61.233095][ T7] ? __lock_acquire+0x2224/0x48b0 [ 61.238120][ T7] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 61.244079][ T7] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 61.250060][ T7] ? __ext4_mark_inode_dirty+0x940/0x940 [ 61.255694][ T7] ? do_writepages+0xfa/0x2a0 [ 61.260356][ T7] do_writepages+0xfa/0x2a0 [ 61.264848][ T7] ? page_writeback_cpu_online+0x10/0x10 [ 61.270497][ T7] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.276023][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.281985][ T7] ? lock_downgrade+0x840/0x840 [ 61.286833][ T7] __writeback_single_inode+0x12a/0x13d0 [ 61.292467][ T7] ? _raw_spin_unlock+0x24/0x40 [ 61.297316][ T7] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 61.303311][ T7] writeback_sb_inodes+0x515/0xdc0 [ 61.308448][ T7] ? __writeback_single_inode+0x13d0/0x13d0 [ 61.314338][ T7] __writeback_inodes_wb+0xc3/0x250 [ 61.319540][ T7] wb_writeback+0x8db/0xd50 [ 61.324035][ T7] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 61.330356][ T7] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 61.336339][ T7] ? cpumask_next+0x3c/0x40 [ 61.340826][ T7] ? get_nr_dirty_inodes+0xd6/0x130 [ 61.346014][ T7] wb_workfn+0xab3/0x1090 [ 61.350330][ T7] ? inode_wait_for_writeback+0x30/0x30 [ 61.355886][ T7] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.361414][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.367392][ T7] process_one_work+0x965/0x1690 [ 61.372341][ T7] ? lock_release+0x800/0x800 [ 61.376998][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.382352][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 61.387296][ T7] worker_thread+0x96/0xe10 [ 61.392044][ T7] ? process_one_work+0x1690/0x1690 [ 61.397221][ T7] kthread+0x3b5/0x4a0 [ 61.401272][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.407085][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.412816][ T7] ret_from_fork+0x1f/0x30 Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.42' (ECDSA) to the list of known hosts. 2020/06/16 15:17:17 fuzzer started 2020/06/16 15:17:18 connecting to host at 10.128.0.26:33143 2020/06/16 15:17:18 checking machine... 2020/06/16 15:17:18 checking revisions... 2020/06/16 15:17:18 testing simple program... syzkaller login: [ 65.682882][ T6789] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6789 [ 65.692112][ T6789] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.698300][ T6789] CPU: 0 PID: 6789 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 65.706540][ T6789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.716575][ T6789] Call Trace: [ 65.719893][ T6789] dump_stack+0x18f/0x20d [ 65.724203][ T6789] check_preemption_disabled+0x20d/0x220 [ 65.729838][ T6789] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.734970][ T6789] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.740551][ T6789] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.746296][ T6789] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.751583][ T6789] ? ext4_ext_release+0x10/0x10 [ 65.756440][ T6789] ? down_write_killable+0x170/0x170 [ 65.761708][ T6789] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.767152][ T6789] ext4_map_blocks+0x4cb/0x1640 [ 65.771990][ T6789] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.777184][ T6789] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.782724][ T6789] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.788693][ T6789] ? prandom_u32_state+0xe/0x170 [ 65.793619][ T6789] ? __brelse+0x84/0xa0 [ 65.797752][ T6789] ? __ext4_new_inode+0x144/0x55e0 [ 65.802856][ T6789] ext4_getblk+0xad/0x520 [ 65.807169][ T6789] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 65.812880][ T6789] ? ext4_free_inode+0x1700/0x1700 [ 65.817968][ T6789] ext4_bread+0x7c/0x380 [ 65.822187][ T6789] ? ext4_getblk+0x520/0x520 [ 65.826762][ T6789] ? dquot_get_next_dqblk+0x180/0x180 [ 65.832155][ T6789] ext4_append+0x153/0x360 [ 65.836590][ T6789] ext4_mkdir+0x5e0/0xdf0 [ 65.841007][ T6789] ? ext4_rmdir+0xde0/0xde0 [ 65.845495][ T6789] ? security_inode_permission+0xc4/0xf0 [ 65.851124][ T6789] vfs_mkdir+0x419/0x690 [ 65.855383][ T6789] do_mkdirat+0x21e/0x280 [ 65.859700][ T6789] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.864534][ T6789] ? do_syscall_64+0x1c/0xe0 [ 65.869198][ T6789] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.875157][ T6789] do_syscall_64+0x60/0xe0 [ 65.879557][ T6789] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.885441][ T6789] RIP: 0033:0x4b02a0 [ 65.889305][ T6789] Code: Bad RIP value. [ 65.893355][ T6789] RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 65.901864][ T6789] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0 [ 65.909832][ T6789] RDX: 00000000000001c0 RSI: 000000c0002d67a0 RDI: ffffffffffffff9c [ 65.917794][ T6789] RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000 [ 65.925745][ T6789] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 65.933693][ T6789] R13: 000000000000003e R14: 000000000000003d R15: 0000000000000100 [ 65.960427][ T6804] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6804 [ 65.969926][ T6804] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.975816][ T6804] CPU: 0 PID: 6804 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.984379][ T6804] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.994412][ T6804] Call Trace: [ 65.997694][ T6804] dump_stack+0x18f/0x20d [ 66.002019][ T6804] check_preemption_disabled+0x20d/0x220 [ 66.007643][ T6804] ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.012751][ T6804] ? ext4_ext_search_right+0x2ca/0xb20 [ 66.018211][ T6804] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 66.023934][ T6804] ext4_ext_map_blocks+0x201b/0x33e0 [ 66.029225][ T6804] ? ext4_ext_release+0x10/0x10 [ 66.034067][ T6804] ? down_write_killable+0x170/0x170 [ 66.039328][ T6804] ? ext4_es_lookup_extent+0x41d/0xd10 [ 66.044776][ T6804] ext4_map_blocks+0x4cb/0x1640 [ 66.049610][ T6804] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 66.054786][ T6804] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 66.060317][ T6804] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.066281][ T6804] ? prandom_u32_state+0xe/0x170 [ 66.071194][ T6804] ? __brelse+0x84/0xa0 [ 66.075328][ T6804] ? __ext4_new_inode+0x144/0x55e0 [ 66.080420][ T6804] ext4_getblk+0xad/0x520 [ 66.084738][ T6804] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 66.090456][ T6804] ? ext4_free_inode+0x1700/0x1700 [ 66.095555][ T6804] ext4_bread+0x7c/0x380 [ 66.099775][ T6804] ? ext4_getblk+0x520/0x520 [ 66.104353][ T6804] ? dquot_get_next_dqblk+0x180/0x180 [ 66.109706][ T6804] ext4_append+0x153/0x360 [ 66.114112][ T6804] ext4_mkdir+0x5e0/0xdf0 [ 66.118424][ T6804] ? ext4_rmdir+0xde0/0xde0 [ 66.122908][ T6804] ? security_inode_permission+0xc4/0xf0 [ 66.128524][ T6804] vfs_mkdir+0x419/0x690 [ 66.132745][ T6804] do_mkdirat+0x21e/0x280 [ 66.137058][ T6804] ? __ia32_sys_mknod+0xb0/0xb0 [ 66.141886][ T6804] ? do_syscall_64+0x1c/0xe0 [ 66.146451][ T6804] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.152425][ T6804] do_syscall_64+0x60/0xe0 [ 66.156830][ T6804] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.162709][ T6804] RIP: 0033:0x45bed7 [ 66.166584][ T6804] Code: Bad RIP value. [ 66.170635][ T6804] RSP: 002b:00007fff4ff12718 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 66.179021][ T6804] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 66.186968][ T6804] RDX: 0000000000000003 RSI: 00000000000001c0 RDI: 00007fff4ff128f0 [ 66.194927][ T6804] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000003700 [ 66.202875][ T6804] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 66.210834][ T6804] R13: 00007fff4ff128f0 R14: 8421084210842109 R15: 00007fff4ff128fc [ 66.304876][ T6805] IPVS: ftp: loaded support on port[0] = 21 [ 66.342545][ T6805] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6805 [ 66.351999][ T6805] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.358209][ T6805] CPU: 0 PID: 6805 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 66.366790][ T6805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.376835][ T6805] Call Trace: [ 66.380118][ T6805] dump_stack+0x18f/0x20d [ 66.384427][ T6805] check_preemption_disabled+0x20d/0x220 [ 66.390041][ T6805] ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.395168][ T6805] ? ext4_ext_search_right+0x2ca/0xb20 [ 66.400606][ T6805] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 66.406304][ T6805] ext4_ext_map_blocks+0x201b/0x33e0 [ 66.411589][ T6805] ? ext4_ext_release+0x10/0x10 [ 66.416489][ T6805] ? down_write_killable+0x170/0x170 [ 66.421898][ T6805] ? ext4_es_lookup_extent+0x41d/0xd10 [ 66.427345][ T6805] ext4_map_blocks+0x4cb/0x1640 [ 66.432183][ T6805] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 66.437372][ T6805] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 66.442904][ T6805] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.448867][ T6805] ? prandom_u32_state+0xe/0x170 [ 66.453809][ T6805] ? __brelse+0x84/0xa0 [ 66.457964][ T6805] ? __ext4_new_inode+0x144/0x55e0 [ 66.463060][ T6805] ext4_getblk+0xad/0x520 [ 66.467373][ T6805] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 66.473160][ T6805] ? ext4_free_inode+0x1700/0x1700 [ 66.478264][ T6805] ext4_bread+0x7c/0x380 [ 66.482570][ T6805] ? ext4_getblk+0x520/0x520 [ 66.487152][ T6805] ? dquot_get_next_dqblk+0x180/0x180 [ 66.492507][ T6805] ext4_append+0x153/0x360 [ 66.496906][ T6805] ext4_mkdir+0x5e0/0xdf0 [ 66.501233][ T6805] ? ext4_rmdir+0xde0/0xde0 [ 66.505725][ T6805] ? security_inode_permission+0xc4/0xf0 [ 66.511341][ T6805] vfs_mkdir+0x419/0x690 [ 66.515571][ T6805] do_mkdirat+0x21e/0x280 [ 66.519879][ T6805] ? __ia32_sys_mknod+0xb0/0xb0 [ 66.524714][ T6805] ? do_syscall_64+0x1c/0xe0 [ 66.529300][ T6805] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.535276][ T6805] do_syscall_64+0x60/0xe0 [ 66.539687][ T6805] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.546083][ T6805] RIP: 0033:0x45bed7 [ 66.549951][ T6805] Code: Bad RIP value. [ 66.553993][ T6805] RSP: 002b:00007fff4ff12608 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 66.562392][ T6805] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7 [ 66.570356][ T6805] RDX: 00007fff4ff12653 RSI: 00000000000001ff RDI: 00007fff4ff12650 [ 66.579452][ T6805] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 66.589402][ T6805] R10: 0000000000000064 R11: 0000000000000202 R12: 00000000004185c0 [ 66.597362][ T6805] R13: 00007fff4ff12640 R14: 0000000000000000 R15: 00007fff4ff12650 [ 66.652174][ T6805] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6805 [ 66.661835][ T6805] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.667942][ T6805] CPU: 0 PID: 6805 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 66.676534][ T6805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.686587][ T6805] Call Trace: [ 66.689895][ T6805] dump_stack+0x18f/0x20d [ 66.694240][ T6805] check_preemption_disabled+0x20d/0x220 [ 66.699881][ T6805] ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.705027][ T6805] ? ext4_ext_search_right+0x2ca/0xb20 [ 66.710524][ T6805] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 66.716264][ T6805] ext4_ext_map_blocks+0x201b/0x33e0 [ 66.721645][ T6805] ? ext4_ext_release+0x10/0x10 [ 66.726543][ T6805] ? down_write_killable+0x170/0x170 [ 66.731825][ T6805] ? ext4_es_lookup_extent+0x41d/0xd10 [ 66.737295][ T6805] ext4_map_blocks+0x4cb/0x1640 [ 66.742527][ T6805] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 66.747747][ T6805] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 66.753287][ T6805] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.759265][ T6805] ? prandom_u32_state+0xe/0x170 [ 66.764237][ T6805] ? __brelse+0x84/0xa0 [ 66.768404][ T6805] ? __ext4_new_inode+0x144/0x55e0 [ 66.773524][ T6805] ext4_getblk+0xad/0x520 [ 66.778457][ T6805] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 66.784161][ T6805] ? ext4_free_inode+0x1700/0x1700 [ 66.789257][ T6805] ext4_bread+0x7c/0x380 [ 66.793500][ T6805] ? ext4_getblk+0x520/0x520 [ 66.798096][ T6805] ? dquot_get_next_dqblk+0x180/0x180 [ 66.803491][ T6805] ext4_append+0x153/0x360 [ 66.807904][ T6805] ext4_mkdir+0x5e0/0xdf0 [ 66.812225][ T6805] ? ext4_rmdir+0xde0/0xde0 [ 66.816745][ T6805] ? security_inode_permission+0xc4/0xf0 [ 66.822362][ T6805] vfs_mkdir+0x419/0x690 [ 66.826625][ T6805] do_mkdirat+0x21e/0x280 [ 66.830958][ T6805] ? __ia32_sys_mknod+0xb0/0xb0 [ 66.835803][ T6805] ? do_syscall_64+0x1c/0xe0 [ 66.840373][ T6805] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.846333][ T6805] do_syscall_64+0x60/0xe0 [ 66.850735][ T6805] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.857232][ T6805] RIP: 0033:0x45bed7 [ 66.861110][ T6805] Code: Bad RIP value. [ 66.865166][ T6805] RSP: 002b:00007fff4ff12608 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 66.873556][ T6805] RAX: ffffffffffffffda RBX: 0000000000010445 RCX: 000000000045bed7 [ 66.881521][ T6805] RDX: 00007fff4ff12653 RSI: 00000000000001ff RDI: 00007fff4ff12650 [ 66.889475][ T6805] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 2020/06/16 15:17:19 building call list... [ 66.897445][ T6805] R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000003 [ 66.905422][ T6805] R13: 00007fff4ff12640 R14: 0000000000010440 R15: 00007fff4ff12650 [ 67.136852][ T7] tipc: TX() has been purged, node left! [ 67.669084][ T7] ================================================================== [ 67.677340][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 67.685228][ T7] Write of size 1 at addr ffff8880a22b91e4 by task kworker/u4:0/7 [ 67.693016][ T7] [ 67.695347][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 67.703587][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.713660][ T7] Workqueue: netns cleanup_net [ 67.718418][ T7] Call Trace: [ 67.721733][ T7] dump_stack+0x18f/0x20d [ 67.726064][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.731616][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.737176][ T7] ? afs_put_call+0xa40/0xa40 [ 67.741864][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 67.748889][ T7] ? vprintk_func+0x97/0x1a6 [ 67.753488][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.759028][ T7] kasan_report.cold+0x1f/0x37 [ 67.763813][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 67.769443][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.775019][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 67.780387][ T7] ? afs_close_socket+0x320/0x320 [ 67.785409][ T7] ? afs_put_call+0xa40/0xa40 [ 67.790082][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 67.795204][ T7] ? afs_put_call+0xa40/0xa40 [ 67.799879][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 67.806311][ T7] rxrpc_call_completed+0xca/0xf0 [ 67.811339][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 67.816714][ T7] ? lock_sock_nested+0x94/0x110 [ 67.821653][ T7] rxrpc_listen+0x147/0x360 [ 67.826160][ T7] afs_close_socket+0x95/0x320 [ 67.830923][ T7] ? afs_purge_servers+0x16d/0x300 [ 67.836035][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 67.841500][ T7] ? init_wait_var_entry+0x200/0x200 [ 67.846789][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 67.852420][ T7] ? check_preemption_disabled+0x38/0x220 [ 67.858139][ T7] afs_net_exit+0x1bc/0x310 [ 67.862636][ T7] ? afs_net_init+0xe30/0xe30 [ 67.867308][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 67.872420][ T7] cleanup_net+0x511/0xa50 [ 67.876837][ T7] ? unregister_pernet_device+0x70/0x70 [ 67.882558][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 67.888615][ T7] process_one_work+0x965/0x1690 [ 67.893573][ T7] ? lock_release+0x800/0x800 [ 67.898335][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 67.903714][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 67.908661][ T7] worker_thread+0x96/0xe10 [ 67.913175][ T7] ? process_one_work+0x1690/0x1690 [ 67.918372][ T7] kthread+0x3b5/0x4a0 [ 67.922522][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.928234][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.933956][ T7] ret_from_fork+0x1f/0x30 [ 67.938465][ T7] [ 67.940788][ T7] Allocated by task 6805: [ 67.945112][ T7] save_stack+0x1b/0x40 [ 67.949619][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 67.955245][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 67.961133][ T7] afs_alloc_call+0x55/0x630 [ 67.965716][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 67.971167][ T7] afs_open_socket+0x292/0x360 [ 67.975923][ T7] afs_net_init+0xa6c/0xe30 [ 67.980421][ T7] ops_init+0xaf/0x420 [ 67.984513][ T7] setup_net+0x2de/0x860 [ 67.988773][ T7] copy_net_ns+0x293/0x590 [ 67.993191][ T7] create_new_namespaces+0x3fb/0xb30 [ 67.998480][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 68.004110][ T7] ksys_unshare+0x43d/0x8e0 [ 68.008608][ T7] __x64_sys_unshare+0x2d/0x40 [ 68.013369][ T7] do_syscall_64+0x60/0xe0 [ 68.017781][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.023745][ T7] [ 68.026066][ T7] Freed by task 7: [ 68.029884][ T7] save_stack+0x1b/0x40 [ 68.034055][ T7] __kasan_slab_free+0xf7/0x140 [ 68.038901][ T7] kfree+0x109/0x2b0 [ 68.042788][ T7] afs_put_call+0x585/0xa40 [ 68.047289][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 68.052653][ T7] rxrpc_listen+0x147/0x360 [ 68.057152][ T7] afs_close_socket+0x95/0x320 [ 68.061908][ T7] afs_net_exit+0x1bc/0x310 [ 68.066406][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 68.071509][ T7] cleanup_net+0x511/0xa50 [ 68.075922][ T7] process_one_work+0x965/0x1690 [ 68.080850][ T7] worker_thread+0x96/0xe10 [ 68.085344][ T7] kthread+0x3b5/0x4a0 [ 68.089412][ T7] ret_from_fork+0x1f/0x30 [ 68.093812][ T7] [ 68.096135][ T7] The buggy address belongs to the object at ffff8880a22b9000 [ 68.096135][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 68.110179][ T7] The buggy address is located 484 bytes inside of [ 68.110179][ T7] 1024-byte region [ffff8880a22b9000, ffff8880a22b9400) [ 68.123539][ T7] The buggy address belongs to the page: [ 68.129166][ T7] page:ffffea000288ae40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 68.138349][ T7] flags: 0xfffe0000000200(slab) [ 68.143197][ T7] raw: 00fffe0000000200 ffffea00028ee9c8 ffffea000280fac8 ffff8880aa000c40 [ 68.151867][ T7] raw: 0000000000000000 ffff8880a22b9000 0000000100000002 0000000000000000 [ 68.160439][ T7] page dumped because: kasan: bad access detected [ 68.166841][ T7] [ 68.169168][ T7] Memory state around the buggy address: [ 68.174792][ T7] ffff8880a22b9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.182845][ T7] ffff8880a22b9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.190988][ T7] >ffff8880a22b9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.199039][ T7] ^ [ 68.206223][ T7] ffff8880a22b9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.214278][ T7] ffff8880a22b9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.222326][ T7] ================================================================== [ 68.230374][ T7] Disabling lock debugging due to kernel taint [ 68.236573][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 68.243154][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 68.252678][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.262734][ T7] Workqueue: netns cleanup_net [ 68.267495][ T7] Call Trace: [ 68.270782][ T7] dump_stack+0x18f/0x20d [ 68.275103][ T7] ? afs_wake_up_async_call+0x690/0x770 [ 68.280646][ T7] ? afs_put_call+0xa40/0xa40 [ 68.285322][ T7] panic+0x2e3/0x75c [ 68.289216][ T7] ? __warn_printk+0xf3/0xf3 [ 68.293898][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 68.300060][ T7] ? trace_hardirqs_on+0x55/0x220 [ 68.305089][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.310626][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.316163][ T7] ? afs_put_call+0xa40/0xa40 [ 68.320867][ T7] end_report+0x4d/0x53 [ 68.325023][ T7] kasan_report.cold+0xd/0x37 [ 68.329721][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 68.335353][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.340915][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 68.346275][ T7] ? afs_close_socket+0x320/0x320 [ 68.351287][ T7] ? afs_put_call+0xa40/0xa40 [ 68.355953][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 68.361054][ T7] ? afs_put_call+0xa40/0xa40 [ 68.365725][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 68.372127][ T7] rxrpc_call_completed+0xca/0xf0 [ 68.377143][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 68.382507][ T7] ? lock_sock_nested+0x94/0x110 [ 68.387439][ T7] rxrpc_listen+0x147/0x360 [ 68.391931][ T7] afs_close_socket+0x95/0x320 [ 68.396685][ T7] ? afs_purge_servers+0x16d/0x300 [ 68.401784][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 68.407234][ T7] ? init_wait_var_entry+0x200/0x200 [ 68.412513][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 executing program [ 68.418142][ T7] ? check_preemption_disabled+0x38/0x220 [ 68.423851][ T7] afs_net_exit+0x1bc/0x310 [ 68.428344][ T7] ? afs_net_init+0xe30/0xe30 [ 68.433009][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 68.438112][ T7] cleanup_net+0x511/0xa50 [ 68.442522][ T7] ? unregister_pernet_device+0x70/0x70 [ 68.448061][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 68.454043][ T7] process_one_work+0x965/0x1690 [ 68.458973][ T7] ? lock_release+0x800/0x800 [ 68.463639][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 68.469001][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 68.475215][ T7] worker_thread+0x96/0xe10 [ 68.479721][ T7] ? process_one_work+0x1690/0x1690 [ 68.484910][ T7] kthread+0x3b5/0x4a0 [ 68.488967][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 68.494674][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 68.500403][ T7] ret_from_fork+0x1f/0x30 [ 68.506129][ T7] Kernel Offset: disabled [ 68.510448][ T7] Rebooting in 86400 seconds..