Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 56.426225][ T425] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:6/425 [ 56.435351][ T425] caller is ext4_mb_new_blocks+0xa77/0x3b30 [ 56.441745][ T425] CPU: 0 PID: 425 Comm: kworker/u4:6 Not tainted 5.7.0-syzkaller #0 [ 56.449758][ T425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.459809][ T425] Workqueue: writeback wb_workfn (flush-8:0) [ 56.465786][ T425] Call Trace: [ 56.469057][ T425] dump_stack+0x188/0x20d [ 56.473373][ T425] debug_smp_processor_id.cold+0x88/0x9b [ 56.479005][ T425] ext4_mb_new_blocks+0xa77/0x3b30 [ 56.484106][ T425] ? __kmalloc+0x62f/0x7a0 [ 56.488525][ T425] ? ext4_ext_search_right+0x2ca/0xb20 [ 56.493981][ T425] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 56.499773][ T425] ext4_ext_map_blocks+0x2044/0x3410 [ 56.505241][ T425] ? ext4_ext_release+0x10/0x10 [ 56.510261][ T425] ? __down_timeout+0x2d0/0x2d0 [ 56.515294][ T425] ? ext4_es_lookup_extent+0x41d/0xd30 [ 56.520850][ T425] ? debug_smp_processor_id+0x2f/0x185 [ 56.526307][ T425] ext4_map_blocks+0x4cb/0x1640 [ 56.531250][ T425] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 56.536427][ T425] ? debug_smp_processor_id+0x2f/0x185 [ 56.541867][ T425] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.547406][ T425] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.553400][ T425] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 56.558979][ T425] ext4_writepages+0x1ab7/0x3400 [ 56.563938][ T425] ? __ext4_mark_inode_dirty+0x950/0x950 [ 56.569557][ T425] ? __lock_acquire+0x2224/0x48a0 [ 56.574620][ T425] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 56.580592][ T425] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 56.586569][ T425] ? __ext4_mark_inode_dirty+0x950/0x950 [ 56.592214][ T425] ? do_writepages+0xfa/0x2a0 [ 56.596883][ T425] do_writepages+0xfa/0x2a0 [ 56.601414][ T425] ? page_writeback_cpu_online+0x10/0x10 [ 56.607336][ T425] ? debug_smp_processor_id+0x2f/0x185 [ 56.612970][ T425] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.618520][ T425] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.624505][ T425] ? lock_downgrade+0x840/0x840 [ 56.629357][ T425] __writeback_single_inode+0x12a/0x1410 [ 56.634971][ T425] ? _raw_spin_unlock+0x24/0x40 [ 56.639886][ T425] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 56.645964][ T425] writeback_sb_inodes+0x515/0xdd0 [ 56.651098][ T425] ? __writeback_single_inode+0x1410/0x1410 [ 56.657262][ T425] __writeback_inodes_wb+0xc3/0x250 [ 56.662455][ T425] wb_writeback+0x910/0xd90 [ 56.666958][ T425] ? print_usage_bug+0x240/0x240 [ 56.671893][ T425] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 56.678250][ T425] ? _find_next_bit.constprop.0+0x1a3/0x200 [ 56.684169][ T425] ? cpumask_next+0x3c/0x40 [ 56.690336][ T425] ? get_nr_dirty_inodes+0xd6/0x130 [ 56.696272][ T425] wb_workfn+0xadf/0x10d0 [ 56.700726][ T425] ? inode_wait_for_writeback+0x30/0x30 [ 56.706624][ T425] ? debug_smp_processor_id+0x2f/0x185 [ 56.712278][ T425] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.718141][ T425] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.724273][ T425] process_one_work+0x965/0x16a0 [ 56.729339][ T425] ? lock_release+0x800/0x800 [ 56.734021][ T425] ? pwq_dec_nr_in_flight+0x310/0x310 [ 56.739390][ T425] ? rwlock_bug.part.0+0x90/0x90 [ 56.744499][ T425] worker_thread+0x96/0xe10 [ 56.749003][ T425] ? process_one_work+0x16a0/0x16a0 [ 56.754202][ T425] kthread+0x388/0x470 [ 56.758251][ T425] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 56.764047][ T425] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 56.769753][ T425] ret_from_fork+0x24/0x30 Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. 2020/06/13 07:30:23 fuzzer started 2020/06/13 07:30:23 connecting to host at 10.128.0.26:38951 2020/06/13 07:30:23 checking machine... 2020/06/13 07:30:23 checking revisions... 2020/06/13 07:30:23 testing simple program... [ 60.711008][ T6945] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6945 [ 60.720210][ T6945] caller is ext4_mb_new_blocks+0xa77/0x3b30 [ 60.726188][ T6945] CPU: 0 PID: 6945 Comm: syz-fuzzer Not tainted 5.7.0-syzkaller #0 [ 60.734082][ T6945] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.744143][ T6945] Call Trace: [ 60.747448][ T6945] dump_stack+0x188/0x20d [ 60.751797][ T6945] debug_smp_processor_id.cold+0x88/0x9b [ 60.757440][ T6945] ext4_mb_new_blocks+0xa77/0x3b30 [ 60.762540][ T6945] ? ext4_ext_search_right+0x2ca/0xb20 [ 60.767992][ T6945] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 60.773697][ T6945] ext4_ext_map_blocks+0x2044/0x3410 [ 60.778971][ T6945] ? ext4_ext_release+0x10/0x10 [ 60.783854][ T6945] ? __down_timeout+0x2d0/0x2d0 [ 60.788780][ T6945] ? ext4_es_lookup_extent+0x41d/0xd30 [ 60.794253][ T6945] ext4_map_blocks+0x4cb/0x1640 [ 60.799115][ T6945] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 60.804324][ T6945] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.809910][ T6945] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.815908][ T6945] ? prandom_u32_state+0xe/0x170 [ 60.820872][ T6945] ? __brelse+0x84/0xa0 [ 60.825008][ T6945] ? __ext4_new_inode+0x144/0x57c0 [ 60.830106][ T6945] ext4_getblk+0xad/0x520 [ 60.834818][ T6945] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 60.841213][ T6945] ? ext4_free_inode+0x17e0/0x17e0 [ 60.846335][ T6945] ext4_bread+0x7c/0x380 [ 60.850563][ T6945] ? ext4_getblk+0x520/0x520 [ 60.855141][ T6945] ? dqget+0xff0/0xff0 [ 60.859194][ T6945] ext4_append+0x153/0x360 [ 60.863592][ T6945] ext4_mkdir+0x5e0/0xdf0 [ 60.867922][ T6945] ? ext4_rmdir+0xde0/0xde0 [ 60.872413][ T6945] ? security_inode_permission+0xc4/0xf0 [ 60.878162][ T6945] vfs_mkdir+0x419/0x690 [ 60.882419][ T6945] do_mkdirat+0x21e/0x280 [ 60.886740][ T6945] ? __ia32_sys_mknod+0xb0/0xb0 [ 60.891775][ T6945] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.897930][ T6945] ? do_syscall_64+0x21/0x7d0 [ 60.903475][ T6945] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.909634][ T6945] do_syscall_64+0xf6/0x7d0 [ 60.914145][ T6945] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 60.920051][ T6945] RIP: 0033:0x4b02a0 [ 60.923937][ T6945] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 60.943615][ T6945] RSP: 002b:000000c0000df4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 60.952447][ T6945] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0 [ 60.960406][ T6945] RDX: 00000000000001c0 RSI: 000000c00009e760 RDI: ffffffffffffff9c [ 60.968467][ T6945] RBP: 000000c0000df510 R08: 0000000000000000 R09: 0000000000000000 [ 60.976423][ T6945] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 60.984377][ T6945] R13: 000000000000003c R14: 000000000000003b R15: 0000000000000100 [ 61.002243][ T6958] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6958 [ 61.011926][ T6958] caller is ext4_mb_new_blocks+0xa77/0x3b30 [ 61.017920][ T6958] CPU: 0 PID: 6958 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 61.026155][ T6958] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.036298][ T6958] Call Trace: [ 61.039578][ T6958] dump_stack+0x188/0x20d [ 61.043917][ T6958] debug_smp_processor_id.cold+0x88/0x9b [ 61.049549][ T6958] ext4_mb_new_blocks+0xa77/0x3b30 [ 61.054687][ T6958] ? ext4_ext_search_right+0x2ca/0xb20 [ 61.060150][ T6958] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 61.066116][ T6958] ext4_ext_map_blocks+0x2044/0x3410 [ 61.071441][ T6958] ? ext4_ext_release+0x10/0x10 [ 61.076295][ T6958] ? __down_timeout+0x2d0/0x2d0 [ 61.081262][ T6958] ? ext4_es_lookup_extent+0x41d/0xd30 [ 61.086707][ T6958] ext4_map_blocks+0x4cb/0x1640 [ 61.091544][ T6958] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 61.096731][ T6958] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.102260][ T6958] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.108745][ T6958] ? prandom_u32_state+0xe/0x170 [ 61.113672][ T6958] ? __brelse+0x84/0xa0 [ 61.117812][ T6958] ? __ext4_new_inode+0x144/0x57c0 [ 61.122921][ T6958] ext4_getblk+0xad/0x520 [ 61.127257][ T6958] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 61.132965][ T6958] ? ext4_free_inode+0x17e0/0x17e0 [ 61.138861][ T6958] ext4_bread+0x7c/0x380 [ 61.143124][ T6958] ? ext4_getblk+0x520/0x520 [ 61.147701][ T6958] ? dqget+0xff0/0xff0 [ 61.151770][ T6958] ext4_append+0x153/0x360 [ 61.156171][ T6958] ext4_mkdir+0x5e0/0xdf0 [ 61.160483][ T6958] ? ext4_rmdir+0xde0/0xde0 [ 61.164969][ T6958] ? security_inode_permission+0xc4/0xf0 [ 61.170604][ T6958] vfs_mkdir+0x419/0x690 [ 61.174833][ T6958] do_mkdirat+0x21e/0x280 [ 61.179230][ T6958] ? __ia32_sys_mknod+0xb0/0xb0 [ 61.184068][ T6958] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.190134][ T6958] ? do_syscall_64+0x21/0x7d0 [ 61.194851][ T6958] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.200862][ T6958] do_syscall_64+0xf6/0x7d0 [ 61.205375][ T6958] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 61.211252][ T6958] RIP: 0033:0x45bee7 [ 61.215128][ T6958] Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 61.235877][ T6958] RSP: 002b:00007ffc5d3d5be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 61.244279][ T6958] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bee7 [ 61.252424][ T6958] RDX: 0000000000000003 RSI: 00000000000001c0 RDI: 00007ffc5d3d5dc0 [ 61.260404][ T6958] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000002f80 [ 61.268367][ T6958] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 61.276472][ T6958] R13: 00007ffc5d3d5dc0 R14: 8421084210842109 R15: 00007ffc5d3d5dcc [ 61.358249][ T6959] IPVS: ftp: loaded support on port[0] = 21 [ 61.395630][ T6959] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6959 [ 61.405578][ T6959] caller is ext4_mb_new_blocks+0xa77/0x3b30 [ 61.411828][ T6959] CPU: 1 PID: 6959 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 61.420306][ T6959] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.430570][ T6959] Call Trace: [ 61.433873][ T6959] dump_stack+0x188/0x20d [ 61.438516][ T6959] debug_smp_processor_id.cold+0x88/0x9b [ 61.444153][ T6959] ext4_mb_new_blocks+0xa77/0x3b30 [ 61.449584][ T6959] ? ext4_ext_search_right+0x2ca/0xb20 [ 61.455121][ T6959] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 61.460840][ T6959] ext4_ext_map_blocks+0x2044/0x3410 [ 61.466131][ T6959] ? ext4_ext_release+0x10/0x10 [ 61.470995][ T6959] ? __down_timeout+0x2d0/0x2d0 [ 61.475830][ T6959] ? ext4_es_lookup_extent+0x41d/0xd30 [ 61.481272][ T6959] ext4_map_blocks+0x4cb/0x1640 [ 61.486132][ T6959] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 61.491323][ T6959] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.496897][ T6959] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.502949][ T6959] ? prandom_u32_state+0xe/0x170 [ 61.507906][ T6959] ? __brelse+0x84/0xa0 [ 61.512067][ T6959] ? __ext4_new_inode+0x144/0x57c0 [ 61.517440][ T6959] ext4_getblk+0xad/0x520 [ 61.521813][ T6959] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 61.527888][ T6959] ? ext4_free_inode+0x17e0/0x17e0 [ 61.533005][ T6959] ext4_bread+0x7c/0x380 [ 61.537245][ T6959] ? ext4_getblk+0x520/0x520 [ 61.541889][ T6959] ? dqget+0xff0/0xff0 [ 61.545957][ T6959] ext4_append+0x153/0x360 [ 61.550372][ T6959] ext4_mkdir+0x5e0/0xdf0 [ 61.554688][ T6959] ? ext4_rmdir+0xde0/0xde0 [ 61.559241][ T6959] ? security_inode_permission+0xc4/0xf0 [ 61.565128][ T6959] vfs_mkdir+0x419/0x690 [ 61.569358][ T6959] do_mkdirat+0x21e/0x280 [ 61.573696][ T6959] ? __ia32_sys_mknod+0xb0/0xb0 [ 61.578608][ T6959] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.584592][ T6959] ? do_syscall_64+0x21/0x7d0 [ 61.589264][ T6959] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.595247][ T6959] do_syscall_64+0xf6/0x7d0 [ 61.599833][ T6959] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 61.605904][ T6959] RIP: 0033:0x45bee7 [ 61.609789][ T6959] Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 61.629370][ T6959] RSP: 002b:00007ffc5d3d5ad8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 61.637759][ T6959] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bee7 [ 61.645707][ T6959] RDX: 00007ffc5d3d5b23 RSI: 00000000000001ff RDI: 00007ffc5d3d5b20 [ 61.653662][ T6959] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 61.661803][ T6959] R10: 0000000000000064 R11: 0000000000000206 R12: 00000000004185d0 [ 61.669771][ T6959] R13: 00007ffc5d3d5b10 R14: 0000000000000000 R15: 00007ffc5d3d5b20 [ 61.717955][ T6959] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6959 [ 61.727587][ T6959] caller is ext4_mb_new_blocks+0xa77/0x3b30 [ 61.733488][ T6959] CPU: 0 PID: 6959 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 61.741723][ T6959] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.751903][ T6959] Call Trace: [ 61.755236][ T6959] dump_stack+0x188/0x20d [ 61.759578][ T6959] debug_smp_processor_id.cold+0x88/0x9b [ 61.765310][ T6959] ext4_mb_new_blocks+0xa77/0x3b30 [ 61.770451][ T6959] ? ext4_ext_search_right+0x2ca/0xb20 [ 61.775959][ T6959] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 61.781852][ T6959] ext4_ext_map_blocks+0x2044/0x3410 [ 61.787156][ T6959] ? ext4_ext_release+0x10/0x10 [ 61.792012][ T6959] ? __down_timeout+0x2d0/0x2d0 [ 61.796846][ T6959] ? ext4_es_lookup_extent+0x41d/0xd30 [ 61.802292][ T6959] ext4_map_blocks+0x4cb/0x1640 [ 61.807125][ T6959] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 61.812304][ T6959] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.817866][ T6959] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.823846][ T6959] ? prandom_u32_state+0xe/0x170 [ 61.828797][ T6959] ? __brelse+0x84/0xa0 [ 61.832964][ T6959] ? __ext4_new_inode+0x144/0x57c0 [ 61.838429][ T6959] ext4_getblk+0xad/0x520 [ 61.843030][ T6959] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 61.848753][ T6959] ? ext4_free_inode+0x17e0/0x17e0 [ 61.853856][ T6959] ext4_bread+0x7c/0x380 [ 61.858174][ T6959] ? ext4_getblk+0x520/0x520 [ 61.862753][ T6959] ? dqget+0xff0/0xff0 [ 61.866811][ T6959] ext4_append+0x153/0x360 [ 61.871210][ T6959] ext4_mkdir+0x5e0/0xdf0 [ 61.875626][ T6959] ? ext4_rmdir+0xde0/0xde0 [ 61.880141][ T6959] ? security_inode_permission+0xc4/0xf0 [ 61.885753][ T6959] vfs_mkdir+0x419/0x690 [ 61.890128][ T6959] do_mkdirat+0x21e/0x280 [ 61.894485][ T6959] ? __ia32_sys_mknod+0xb0/0xb0 [ 61.899436][ T6959] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.905487][ T6959] ? do_syscall_64+0x21/0x7d0 [ 61.910195][ T6959] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.916158][ T6959] do_syscall_64+0xf6/0x7d0 [ 61.920698][ T6959] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 61.926607][ T6959] RIP: 0033:0x45bee7 [ 61.930492][ T6959] Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 61.950076][ T6959] RSP: 002b:00007ffc5d3d5ad8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 61.958659][ T6959] RAX: ffffffffffffffda RBX: 000000000000f110 RCX: 000000000045bee7 2020/06/13 07:30:25 building call list... [ 61.966614][ T6959] RDX: 00007ffc5d3d5b23 RSI: 00000000000001ff RDI: 00007ffc5d3d5b20 [ 61.974568][ T6959] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 [ 61.982526][ T6959] R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000003 [ 61.990493][ T6959] R13: 00007ffc5d3d5b10 R14: 000000000000f109 R15: 00007ffc5d3d5b20 [ 62.263875][ T425] tipc: TX() has been purged, node left! [ 62.785959][ T425] ================================================================== [ 62.794288][ T425] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x7a7/0x880 [ 62.802261][ T425] Write of size 1 at addr ffff8880977539e4 by task kworker/u4:6/425 [ 62.810229][ T425] [ 62.812578][ T425] CPU: 1 PID: 425 Comm: kworker/u4:6 Not tainted 5.7.0-syzkaller #0 [ 62.820675][ T425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.831699][ T425] Workqueue: netns cleanup_net [ 62.838221][ T425] Call Trace: [ 62.841528][ T425] dump_stack+0x188/0x20d [ 62.845867][ T425] ? afs_wake_up_async_call+0x7a7/0x880 [ 62.851410][ T425] ? afs_wake_up_async_call+0x7a7/0x880 [ 62.857049][ T425] ? afs_put_call+0xa70/0xa70 [ 62.861739][ T425] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.868862][ T425] ? vprintk_func+0x97/0x1a6 [ 62.873801][ T425] ? afs_wake_up_async_call+0x7a7/0x880 [ 62.881032][ T425] kasan_report.cold+0x1f/0x37 [ 62.886319][ T425] ? afs_wake_up_async_call+0x7a7/0x880 [ 62.892070][ T425] afs_wake_up_async_call+0x7a7/0x880 [ 62.897460][ T425] ? do_raw_spin_lock+0x129/0x2e0 [ 62.902579][ T425] ? afs_close_socket+0x320/0x320 [ 62.907627][ T425] ? rwlock_bug.part.0+0x90/0x90 [ 62.912575][ T425] ? rcu_read_lock_held+0x9c/0xb0 [ 62.917598][ T425] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.923231][ T425] ? afs_close_socket+0x320/0x320 [ 62.928260][ T425] ? afs_put_call+0xa70/0xa70 [ 62.933219][ T425] rxrpc_notify_socket+0x1e5/0x5e0 [ 62.939745][ T425] ? afs_put_call+0xa70/0xa70 [ 62.945048][ T425] __rxrpc_set_call_completion.part.0+0x172/0x420 [ 62.952031][ T425] rxrpc_call_completed+0xca/0xf0 [ 62.957071][ T425] rxrpc_discard_prealloc+0x786/0xac0 [ 62.962546][ T425] ? lock_sock_nested+0x94/0x110 [ 62.967952][ T425] rxrpc_listen+0x147/0x360 [ 62.972771][ T425] afs_close_socket+0x95/0x320 [ 62.977731][ T425] ? afs_purge_servers+0x16d/0x300 [ 62.982890][ T425] ? afs_rx_discard_new_call+0x50/0x50 [ 62.988455][ T425] ? debug_smp_processor_id+0x2f/0x185 [ 62.994013][ T425] ? init_wait_var_entry+0x200/0x200 [ 62.999487][ T425] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.005135][ T425] afs_net_exit+0x1bc/0x310 [ 63.009671][ T425] ? afs_net_init+0xe30/0xe30 [ 63.014346][ T425] ops_exit_list.isra.0+0xa8/0x150 [ 63.019470][ T425] cleanup_net+0x511/0xa50 [ 63.023886][ T425] ? unregister_pernet_device+0x70/0x70 [ 63.030054][ T425] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.036052][ T425] process_one_work+0x965/0x16a0 [ 63.041022][ T425] ? lock_release+0x800/0x800 [ 63.045702][ T425] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.051084][ T425] ? rwlock_bug.part.0+0x90/0x90 [ 63.056045][ T425] worker_thread+0x96/0xe10 [ 63.060566][ T425] ? process_one_work+0x16a0/0x16a0 [ 63.065794][ T425] kthread+0x388/0x470 [ 63.069868][ T425] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.075586][ T425] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.081311][ T425] ret_from_fork+0x24/0x30 [ 63.085737][ T425] [ 63.088059][ T425] Allocated by task 6959: [ 63.092567][ T425] save_stack+0x1b/0x40 [ 63.096721][ T425] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 63.102357][ T425] kmem_cache_alloc_trace+0x153/0x7d0 [ 63.108419][ T425] afs_alloc_call+0x55/0x640 [ 63.113012][ T425] afs_charge_preallocation+0xe9/0x2d0 [ 63.118463][ T425] afs_open_socket+0x292/0x360 [ 63.123251][ T425] afs_net_init+0xa6c/0xe30 [ 63.127746][ T425] ops_init+0xaf/0x420 [ 63.131895][ T425] setup_net+0x2de/0x860 [ 63.136132][ T425] copy_net_ns+0x293/0x590 [ 63.140552][ T425] create_new_namespaces+0x3fb/0xb30 [ 63.145838][ T425] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 63.151463][ T425] ksys_unshare+0x43d/0x8e0 [ 63.155977][ T425] __x64_sys_unshare+0x2d/0x40 [ 63.161115][ T425] do_syscall_64+0xf6/0x7d0 [ 63.166582][ T425] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 63.172552][ T425] [ 63.174879][ T425] Freed by task 425: [ 63.178804][ T425] save_stack+0x1b/0x40 [ 63.183233][ T425] __kasan_slab_free+0xf7/0x140 [ 63.188175][ T425] kfree+0x109/0x2b0 [ 63.192076][ T425] afs_put_call+0x59b/0xa70 [ 63.196584][ T425] rxrpc_discard_prealloc+0x769/0xac0 [ 63.201958][ T425] rxrpc_listen+0x147/0x360 [ 63.206537][ T425] afs_close_socket+0x95/0x320 [ 63.211312][ T425] afs_net_exit+0x1bc/0x310 [ 63.216387][ T425] ops_exit_list.isra.0+0xa8/0x150 [ 63.221645][ T425] cleanup_net+0x511/0xa50 [ 63.226078][ T425] process_one_work+0x965/0x16a0 [ 63.231032][ T425] worker_thread+0x96/0xe10 [ 63.235544][ T425] kthread+0x388/0x470 [ 63.239631][ T425] ret_from_fork+0x24/0x30 [ 63.244043][ T425] [ 63.246535][ T425] The buggy address belongs to the object at ffff888097753800 [ 63.246535][ T425] which belongs to the cache kmalloc-1k of size 1024 [ 63.260963][ T425] The buggy address is located 484 bytes inside of [ 63.260963][ T425] 1024-byte region [ffff888097753800, ffff888097753c00) [ 63.274901][ T425] The buggy address belongs to the page: [ 63.280561][ T425] page:ffffea00025dd4c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 63.289696][ T425] flags: 0xfffe0000000200(slab) [ 63.294559][ T425] raw: 00fffe0000000200 ffffea00027d1108 ffffea0002757008 ffff8880aa000c40 [ 63.303165][ T425] raw: 0000000000000000 ffff888097753000 0000000100000002 0000000000000000 [ 63.311758][ T425] page dumped because: kasan: bad access detected [ 63.318169][ T425] [ 63.320489][ T425] Memory state around the buggy address: [ 63.326205][ T425] ffff888097753880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.334271][ T425] ffff888097753900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.342568][ T425] >ffff888097753980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.350629][ T425] ^ [ 63.358051][ T425] ffff888097753a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.366127][ T425] ffff888097753a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.374281][ T425] ================================================================== [ 63.382335][ T425] Disabling lock debugging due to kernel taint [ 63.388539][ T425] Kernel panic - not syncing: panic_on_warn set ... [ 63.395141][ T425] CPU: 1 PID: 425 Comm: kworker/u4:6 Tainted: G B 5.7.0-syzkaller #0 [ 63.404767][ T425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.415096][ T425] Workqueue: netns cleanup_net [ 63.419861][ T425] Call Trace: [ 63.423152][ T425] dump_stack+0x188/0x20d [ 63.427487][ T425] ? afs_wake_up_async_call+0x6b0/0x880 [ 63.433026][ T425] ? afs_put_call+0xa70/0xa70 [ 63.437723][ T425] panic+0x2e3/0x75c [ 63.441619][ T425] ? add_taint.cold+0x16/0x16 [ 63.446295][ T425] ? retint_kernel+0x2b/0x2b [ 63.450887][ T425] ? trace_hardirqs_on+0x55/0x230 [ 63.455999][ T425] ? afs_wake_up_async_call+0x7a7/0x880 [ 63.461540][ T425] ? afs_wake_up_async_call+0x7a7/0x880 [ 63.467077][ T425] ? afs_put_call+0xa70/0xa70 [ 63.471762][ T425] end_report+0x4d/0x53 [ 63.475912][ T425] kasan_report.cold+0xd/0x37 [ 63.480593][ T425] ? afs_wake_up_async_call+0x7a7/0x880 executing program [ 63.486566][ T425] afs_wake_up_async_call+0x7a7/0x880 [ 63.491937][ T425] ? do_raw_spin_lock+0x129/0x2e0 [ 63.496965][ T425] ? afs_close_socket+0x320/0x320 [ 63.501982][ T425] ? rwlock_bug.part.0+0x90/0x90 [ 63.506942][ T425] ? rcu_read_lock_held+0x9c/0xb0 [ 63.511959][ T425] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.517595][ T425] ? afs_close_socket+0x320/0x320 [ 63.522703][ T425] ? afs_put_call+0xa70/0xa70 [ 63.527411][ T425] rxrpc_notify_socket+0x1e5/0x5e0 [ 63.532518][ T425] ? afs_put_call+0xa70/0xa70 [ 63.537184][ T425] __rxrpc_set_call_completion.part.0+0x172/0x420 [ 63.543598][ T425] rxrpc_call_completed+0xca/0xf0 [ 63.548630][ T425] rxrpc_discard_prealloc+0x786/0xac0 [ 63.554005][ T425] ? lock_sock_nested+0x94/0x110 [ 63.558942][ T425] rxrpc_listen+0x147/0x360 [ 63.563464][ T425] afs_close_socket+0x95/0x320 [ 63.568227][ T425] ? afs_purge_servers+0x16d/0x300 [ 63.573349][ T425] ? afs_rx_discard_new_call+0x50/0x50 [ 63.578927][ T425] ? debug_smp_processor_id+0x2f/0x185 [ 63.588308][ T425] ? init_wait_var_entry+0x200/0x200 [ 63.593609][ T425] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.599372][ T425] afs_net_exit+0x1bc/0x310 [ 63.603881][ T425] ? afs_net_init+0xe30/0xe30 [ 63.608568][ T425] ops_exit_list.isra.0+0xa8/0x150 [ 63.613983][ T425] cleanup_net+0x511/0xa50 [ 63.618500][ T425] ? unregister_pernet_device+0x70/0x70 [ 63.624056][ T425] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.630058][ T425] process_one_work+0x965/0x16a0 [ 63.634997][ T425] ? lock_release+0x800/0x800 [ 63.639779][ T425] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.645241][ T425] ? rwlock_bug.part.0+0x90/0x90 [ 63.650454][ T425] worker_thread+0x96/0xe10 [ 63.656406][ T425] ? process_one_work+0x16a0/0x16a0 [ 63.661599][ T425] kthread+0x388/0x470 [ 63.665672][ T425] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.671368][ T425] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.677065][ T425] ret_from_fork+0x24/0x30 [ 63.683059][ T425] Kernel Offset: disabled [ 63.687424][ T425] Rebooting in 86400 seconds..