Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. 2020/06/15 13:04:44 fuzzer started 2020/06/15 13:04:44 connecting to host at 10.128.0.26:39823 2020/06/15 13:04:44 checking machine... 2020/06/15 13:04:44 checking revisions... 2020/06/15 13:04:44 testing simple program... syzkaller login: [ 44.665360][ T6800] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6800 [ 44.674763][ T6800] caller is ext4_mb_new_blocks+0x301/0x1620 [ 44.680960][ T6800] CPU: 1 PID: 6800 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 44.689370][ T6800] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.699549][ T6800] Call Trace: [ 44.702840][ T6800] dump_stack+0x1f0/0x31e [ 44.707181][ T6800] check_preemption_disabled+0x1c9/0x240 [ 44.712970][ T6800] ext4_mb_new_blocks+0x301/0x1620 [ 44.718084][ T6800] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 44.723526][ T6800] ? ext4_map_blocks+0x7ea/0x19e0 [ 44.728546][ T6800] ext4_map_blocks+0x8c1/0x19e0 [ 44.733391][ T6800] ext4_getblk+0xa4/0x460 [ 44.737954][ T6800] ext4_bread+0x48/0x330 [ 44.742352][ T6800] ext4_append+0x153/0x2d0 [ 44.746749][ T6800] ext4_mkdir+0x75f/0x14c0 [ 44.751177][ T6800] vfs_mkdir+0x42a/0x620 [ 44.756087][ T6800] do_mkdirat+0x1b9/0x310 [ 44.760522][ T6800] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.766661][ T6800] do_syscall_64+0x73/0xe0 [ 44.771057][ T6800] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.776923][ T6800] RIP: 0033:0x4b02a0 [ 44.780883][ T6800] Code: Bad RIP value. [ 44.785007][ T6800] RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 44.793399][ T6800] RAX: ffffffffffffffda RBX: 000000c00002e500 RCX: 00000000004b02a0 [ 44.801354][ T6800] RDX: 00000000000001c0 RSI: 000000c0000dea80 RDI: ffffffffffffff9c [ 44.809475][ T6800] RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000 [ 44.817506][ T6800] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 44.825496][ T6800] R13: 0000000000000055 R14: 0000000000000054 R15: 0000000000000100 [ 44.846513][ T6804] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6804 [ 44.856074][ T6804] caller is ext4_mb_new_blocks+0x301/0x1620 [ 44.862413][ T6804] CPU: 0 PID: 6804 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 44.871221][ T6804] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.881360][ T6804] Call Trace: [ 44.884631][ T6804] dump_stack+0x1f0/0x31e [ 44.889145][ T6804] check_preemption_disabled+0x1c9/0x240 [ 44.894859][ T6804] ext4_mb_new_blocks+0x301/0x1620 [ 44.900070][ T6804] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 44.905359][ T6804] ? ext4_map_blocks+0x7ea/0x19e0 [ 44.910544][ T6804] ext4_map_blocks+0x8c1/0x19e0 [ 44.915858][ T6804] ext4_getblk+0xa4/0x460 [ 44.920379][ T6804] ext4_bread+0x48/0x330 [ 44.924666][ T6804] ext4_append+0x153/0x2d0 [ 44.929073][ T6804] ext4_mkdir+0x75f/0x14c0 [ 44.933480][ T6804] vfs_mkdir+0x42a/0x620 [ 44.937728][ T6804] do_mkdirat+0x1b9/0x310 [ 44.942068][ T6804] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.948232][ T6804] do_syscall_64+0x73/0xe0 [ 44.953014][ T6804] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 44.958984][ T6804] RIP: 0033:0x45bed7 [ 44.963003][ T6804] Code: Bad RIP value. [ 44.967059][ T6804] RSP: 002b:00007ffd47255808 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 44.975470][ T6804] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 44.983427][ T6804] RDX: 0000000000000002 RSI: 00000000000001c0 RDI: 00007ffd472559e0 [ 44.991391][ T6804] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000002cc0 [ 44.999342][ T6804] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 45.007756][ T6804] R13: 00007ffd472559e0 R14: 8421084210842109 R15: 00007ffd472559ec [ 45.077203][ T6805] IPVS: ftp: loaded support on port[0] = 21 [ 45.112882][ T6805] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6805 [ 45.122342][ T6805] caller is ext4_mb_new_blocks+0x301/0x1620 [ 45.128328][ T6805] CPU: 1 PID: 6805 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 45.137117][ T6805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.147160][ T6805] Call Trace: [ 45.150430][ T6805] dump_stack+0x1f0/0x31e [ 45.155017][ T6805] check_preemption_disabled+0x1c9/0x240 [ 45.163032][ T6805] ext4_mb_new_blocks+0x301/0x1620 [ 45.168238][ T6805] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 45.173609][ T6805] ? ext4_map_blocks+0x7ea/0x19e0 [ 45.178622][ T6805] ext4_map_blocks+0x8c1/0x19e0 [ 45.183459][ T6805] ext4_getblk+0xa4/0x460 [ 45.188373][ T6805] ext4_bread+0x48/0x330 [ 45.192608][ T6805] ext4_append+0x153/0x2d0 [ 45.197026][ T6805] ext4_mkdir+0x75f/0x14c0 [ 45.201434][ T6805] vfs_mkdir+0x42a/0x620 [ 45.207577][ T6805] do_mkdirat+0x1b9/0x310 [ 45.211897][ T6805] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.217973][ T6805] do_syscall_64+0x73/0xe0 [ 45.222538][ T6805] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.228453][ T6805] RIP: 0033:0x45bed7 [ 45.232579][ T6805] Code: Bad RIP value. [ 45.236634][ T6805] RSP: 002b:00007ffd472556f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 45.245015][ T6805] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7 [ 45.252961][ T6805] RDX: 00007ffd47255743 RSI: 00000000000001ff RDI: 00007ffd47255740 [ 45.261284][ T6805] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 45.269593][ T6805] R10: 0000000000000064 R11: 0000000000000202 R12: 00000000004185c0 [ 45.277538][ T6805] R13: 00007ffd47255730 R14: 0000000000000000 R15: 00007ffd47255740 [ 45.332440][ T6805] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6805 [ 45.343830][ T6805] caller is ext4_mb_new_blocks+0x301/0x1620 [ 45.349886][ T6805] CPU: 0 PID: 6805 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 45.358484][ T6805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.368605][ T6805] Call Trace: [ 45.371875][ T6805] dump_stack+0x1f0/0x31e [ 45.376185][ T6805] check_preemption_disabled+0x1c9/0x240 [ 45.381825][ T6805] ext4_mb_new_blocks+0x301/0x1620 [ 45.387043][ T6805] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 45.392589][ T6805] ? ext4_map_blocks+0x7ea/0x19e0 [ 45.397711][ T6805] ext4_map_blocks+0x8c1/0x19e0 [ 45.402561][ T6805] ext4_getblk+0xa4/0x460 [ 45.406869][ T6805] ext4_bread+0x48/0x330 [ 45.411098][ T6805] ext4_append+0x153/0x2d0 [ 45.415517][ T6805] ext4_mkdir+0x75f/0x14c0 [ 45.419968][ T6805] vfs_mkdir+0x42a/0x620 [ 45.424319][ T6805] do_mkdirat+0x1b9/0x310 [ 45.428645][ T6805] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.434711][ T6805] do_syscall_64+0x73/0xe0 [ 45.439154][ T6805] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.445053][ T6805] RIP: 0033:0x45bed7 [ 45.449014][ T6805] Code: Bad RIP value. [ 45.453061][ T6805] RSP: 002b:00007ffd472556f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 45.461629][ T6805] RAX: ffffffffffffffda RBX: 000000000000b106 RCX: 000000000045bed7 [ 45.469582][ T6805] RDX: 00007ffd47255743 RSI: 00000000000001ff RDI: 00007ffd47255740 2020/06/15 13:04:45 building call list... [ 45.477571][ T6805] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 [ 45.485695][ T6805] R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000003 [ 45.493661][ T6805] R13: 00007ffd47255730 R14: 000000000000b0f5 R15: 00007ffd47255740 [ 45.671372][ T1153] BUG: using smp_processor_id() in preemptible [00000000] code: khugepaged/1153 [ 45.680773][ T1153] caller is ext4_mb_new_blocks+0x301/0x1620 [ 45.686819][ T1153] CPU: 1 PID: 1153 Comm: khugepaged Not tainted 5.8.0-rc1-syzkaller #0 [ 45.695053][ T1153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.705132][ T1153] Call Trace: [ 45.708550][ T1153] dump_stack+0x1f0/0x31e [ 45.712934][ T1153] check_preemption_disabled+0x1c9/0x240 [ 45.718729][ T1153] ext4_mb_new_blocks+0x301/0x1620 [ 45.723861][ T1153] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 45.729155][ T1153] ? ext4_map_blocks+0x7ea/0x19e0 [ 45.734252][ T1153] ext4_map_blocks+0x8c1/0x19e0 [ 45.739121][ T1153] ext4_writepages+0x150c/0x3750 [ 45.744172][ T1153] ? mark_lock+0x102/0x1b00 [ 45.748701][ T1153] ? __lock_acquire+0x116c/0x2c30 [ 45.753762][ T1153] ? ext4_readpage+0x140/0x140 [ 45.758533][ T1153] do_writepages+0xda/0x1f0 [ 45.763205][ T1153] __filemap_fdatawrite_range+0x2a5/0x350 [ 45.768944][ T1153] collapse_file+0x2edc/0x39d0 [ 45.773758][ T1153] khugepaged_scan_mm_slot+0x6353/0x69a0 [ 45.779408][ T1153] ? __lock_acquire+0x116c/0x2c30 [ 45.784668][ T1153] ? lock_acquire+0x160/0x720 [ 45.789365][ T1153] ? khugepaged_do_scan+0x1ac/0x590 [ 45.794599][ T1153] khugepaged_do_scan+0x22f/0x590 [ 45.799725][ T1153] khugepaged+0xa5/0x7b0 [ 45.803966][ T1153] ? init_wait_entry+0xd0/0xd0 [ 45.808745][ T1153] kthread+0x37e/0x3a0 [ 45.812819][ T1153] ? start_stop_khugepaged+0x3b0/0x3b0 [ 45.818290][ T1153] ? kthread_blkcg+0xd0/0xd0 [ 45.822872][ T1153] ret_from_fork+0x1f/0x30 [ 45.899778][ T1153] BUG: using smp_processor_id() in preemptible [00000000] code: khugepaged/1153 [ 45.908940][ T1153] caller is ext4_mb_new_blocks+0x301/0x1620 [ 45.914932][ T1153] CPU: 1 PID: 1153 Comm: khugepaged Not tainted 5.8.0-rc1-syzkaller #0 [ 45.923182][ T1153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.933759][ T1153] Call Trace: [ 45.937071][ T1153] dump_stack+0x1f0/0x31e [ 45.941396][ T1153] check_preemption_disabled+0x1c9/0x240 [ 45.947222][ T1153] ext4_mb_new_blocks+0x301/0x1620 [ 45.952450][ T1153] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 45.958040][ T1153] ? ext4_map_blocks+0x7ea/0x19e0 [ 45.963063][ T1153] ext4_map_blocks+0x8c1/0x19e0 [ 45.969086][ T1153] ext4_writepages+0x150c/0x3750 [ 45.974848][ T1153] ? ext4_readpage+0x140/0x140 [ 45.979616][ T1153] do_writepages+0xda/0x1f0 [ 45.984125][ T1153] __filemap_fdatawrite_range+0x2a5/0x350 [ 45.990201][ T1153] collapse_file+0x2edc/0x39d0 [ 45.994977][ T1153] khugepaged_scan_mm_slot+0x6353/0x69a0 [ 46.000623][ T1153] ? __lock_acquire+0x116c/0x2c30 [ 46.005680][ T1153] ? lock_acquire+0x160/0x720 [ 46.010353][ T1153] ? khugepaged_do_scan+0x1ac/0x590 [ 46.015576][ T1153] khugepaged_do_scan+0x22f/0x590 [ 46.020794][ T1153] khugepaged+0xa5/0x7b0 [ 46.025078][ T1153] ? init_wait_entry+0xd0/0xd0 [ 46.029926][ T1153] kthread+0x37e/0x3a0 [ 46.034003][ T1153] ? start_stop_khugepaged+0x3b0/0x3b0 [ 46.039623][ T1153] ? kthread_blkcg+0xd0/0xd0 [ 46.044207][ T1153] ret_from_fork+0x1f/0x30 [ 46.049722][ T7] tipc: TX() has been purged, node left! [ 46.098340][ T1153] BUG: using smp_processor_id() in preemptible [00000000] code: khugepaged/1153 [ 46.107653][ T1153] caller is ext4_mb_new_blocks+0x301/0x1620 [ 46.113539][ T1153] CPU: 1 PID: 1153 Comm: khugepaged Not tainted 5.8.0-rc1-syzkaller #0 [ 46.121765][ T1153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.132038][ T1153] Call Trace: [ 46.135334][ T1153] dump_stack+0x1f0/0x31e [ 46.139663][ T1153] check_preemption_disabled+0x1c9/0x240 [ 46.145297][ T1153] ext4_mb_new_blocks+0x301/0x1620 [ 46.150415][ T1153] ext4_ext_map_blocks+0x2ad5/0x6d20 [ 46.155709][ T1153] ? ext4_map_blocks+0x7ea/0x19e0 [ 46.160742][ T1153] ext4_map_blocks+0x8c1/0x19e0 [ 46.165602][ T1153] ext4_writepages+0x150c/0x3750 [ 46.170586][ T1153] ? ext4_readpage+0x140/0x140 [ 46.175428][ T1153] do_writepages+0xda/0x1f0 [ 46.179942][ T1153] __filemap_fdatawrite_range+0x2a5/0x350 [ 46.186297][ T1153] collapse_file+0x2edc/0x39d0 [ 46.191339][ T1153] khugepaged_scan_mm_slot+0x6353/0x69a0 [ 46.197187][ T1153] ? __lock_acquire+0x116c/0x2c30 [ 46.202274][ T1153] ? lock_acquire+0x160/0x720 [ 46.206962][ T1153] ? khugepaged_do_scan+0x1ac/0x590 [ 46.212241][ T1153] khugepaged_do_scan+0x22f/0x590 [ 46.217307][ T1153] khugepaged+0xa5/0x7b0 [ 46.221547][ T1153] ? init_wait_entry+0xd0/0xd0 [ 46.226305][ T1153] kthread+0x37e/0x3a0 [ 46.230376][ T1153] ? start_stop_khugepaged+0x3b0/0x3b0 [ 46.235825][ T1153] ? kthread_blkcg+0xd0/0xd0 [ 46.240406][ T1153] ret_from_fork+0x1f/0x30 [ 46.698019][ T7] ================================================================== [ 46.706217][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x16f/0x1c0 [ 46.714098][ T7] Write of size 1 at addr ffff8880827129e4 by task kworker/u4:0/7 [ 46.721928][ T7] [ 46.724257][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 46.732392][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.742448][ T7] Workqueue: netns cleanup_net [ 46.747235][ T7] Call Trace: [ 46.750538][ T7] dump_stack+0x1f0/0x31e [ 46.754864][ T7] print_address_description+0x66/0x5a0 [ 46.760423][ T7] ? vprintk_emit+0x342/0x3c0 [ 46.765096][ T7] ? printk+0x62/0x83 [ 46.769114][ T7] ? vprintk_emit+0x339/0x3c0 [ 46.773792][ T7] kasan_report+0x132/0x1d0 [ 46.778305][ T7] ? afs_wake_up_async_call+0x16f/0x1c0 [ 46.783847][ T7] ? afs_make_call+0x24f0/0x24f0 [ 46.788774][ T7] afs_wake_up_async_call+0x16f/0x1c0 [ 46.794140][ T7] ? afs_make_call+0x24f0/0x24f0 [ 46.799068][ T7] rxrpc_notify_socket+0x1e7/0x4a0 [ 46.804178][ T7] rxrpc_call_completed+0x131/0x210 [ 46.809382][ T7] ? afs_rx_new_call+0x240/0x240 [ 46.814339][ T7] rxrpc_discard_prealloc+0x60d/0x710 [ 46.819970][ T7] rxrpc_listen+0x246/0x370 [ 46.824476][ T7] afs_close_socket+0x57/0x280 [ 46.829230][ T7] ? afs_purge_servers+0x21f/0x280 [ 46.834332][ T7] ? init_wait_var_entry+0x150/0x150 [ 46.839718][ T7] afs_net_exit+0x4f/0x90 [ 46.844049][ T7] cleanup_net+0x708/0xba0 [ 46.848505][ T7] process_one_work+0x789/0xfc0 [ 46.853390][ T7] worker_thread+0xaa4/0x1460 [ 46.858117][ T7] kthread+0x37e/0x3a0 [ 46.862188][ T7] ? rcu_lock_release+0x20/0x20 [ 46.867033][ T7] ? kthread_blkcg+0xd0/0xd0 [ 46.871680][ T7] ret_from_fork+0x1f/0x30 [ 46.876371][ T7] [ 46.878880][ T7] Allocated by task 6805: [ 46.883219][ T7] __kasan_kmalloc+0x103/0x140 [ 46.887986][ T7] kmem_cache_alloc_trace+0x234/0x300 [ 46.893368][ T7] afs_alloc_call+0x89/0x2f0 [ 46.897962][ T7] afs_charge_preallocation+0xf0/0x2a0 [ 46.903436][ T7] afs_open_socket+0x3c7/0x510 [ 46.908233][ T7] afs_net_init+0x772/0x940 [ 46.912753][ T7] ops_init+0x320/0x410 [ 46.916983][ T7] setup_net+0x1cb/0x770 [ 46.921200][ T7] copy_net_ns+0x339/0x540 [ 46.925588][ T7] create_new_namespaces+0x52e/0x9f0 [ 46.931124][ T7] unshare_nsproxy_namespaces+0x123/0x190 [ 46.936823][ T7] ksys_unshare+0x463/0x950 [ 46.941322][ T7] __x64_sys_unshare+0x34/0x40 [ 46.946073][ T7] do_syscall_64+0x73/0xe0 [ 46.950472][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.956333][ T7] [ 46.958636][ T7] Freed by task 7: [ 46.962334][ T7] __kasan_slab_free+0x114/0x170 [ 46.967244][ T7] kfree+0x10a/0x220 [ 46.971122][ T7] afs_put_call+0x30e/0x420 [ 46.975866][ T7] rxrpc_discard_prealloc+0x5e2/0x710 [ 46.981266][ T7] rxrpc_listen+0x246/0x370 [ 46.985939][ T7] afs_close_socket+0x57/0x280 [ 46.990701][ T7] afs_net_exit+0x4f/0x90 [ 46.995004][ T7] cleanup_net+0x708/0xba0 [ 46.999398][ T7] process_one_work+0x789/0xfc0 [ 47.004234][ T7] worker_thread+0xaa4/0x1460 [ 47.008888][ T7] kthread+0x37e/0x3a0 [ 47.012933][ T7] ret_from_fork+0x1f/0x30 [ 47.017320][ T7] [ 47.019638][ T7] The buggy address belongs to the object at ffff888082712800 [ 47.019638][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 47.033676][ T7] The buggy address is located 484 bytes inside of [ 47.033676][ T7] 1024-byte region [ffff888082712800, ffff888082712c00) [ 47.047113][ T7] The buggy address belongs to the page: [ 47.052740][ T7] page:ffffea000209c480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 47.061818][ T7] flags: 0xfffe0000000200(slab) [ 47.066655][ T7] raw: 00fffe0000000200 ffffea000222e388 ffffea000222fe88 ffff8880aa400c40 [ 47.075235][ T7] raw: 0000000000000000 ffff888082712000 0000000100000002 0000000000000000 [ 47.083802][ T7] page dumped because: kasan: bad access detected [ 47.090189][ T7] [ 47.092491][ T7] Memory state around the buggy address: [ 47.098095][ T7] ffff888082712880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.106274][ T7] ffff888082712900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.114348][ T7] >ffff888082712980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.122511][ T7] ^ [ 47.131527][ T7] ffff888082712a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.139576][ T7] ffff888082712a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.147771][ T7] ================================================================== [ 47.155818][ T7] Disabling lock debugging due to kernel taint [ 47.162038][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 47.168624][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 47.178599][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.189185][ T7] Workqueue: netns cleanup_net [ 47.193961][ T7] Call Trace: [ 47.197411][ T7] dump_stack+0x1f0/0x31e [ 47.201923][ T7] panic+0x264/0x7a0 [ 47.205812][ T7] ? trace_hardirqs_on+0x30/0x80 [ 47.210772][ T7] ? _raw_spin_unlock_irqrestore+0xa5/0xd0 [ 47.216616][ T7] kasan_report+0x1c9/0x1d0 [ 47.221517][ T7] ? afs_wake_up_async_call+0x16f/0x1c0 [ 47.228027][ T7] ? afs_make_call+0x24f0/0x24f0 [ 47.232935][ T7] afs_wake_up_async_call+0x16f/0x1c0 [ 47.238296][ T7] ? afs_make_call+0x24f0/0x24f0 [ 47.243212][ T7] rxrpc_notify_socket+0x1e7/0x4a0 [ 47.248296][ T7] rxrpc_call_completed+0x131/0x210 [ 47.253462][ T7] ? afs_rx_new_call+0x240/0x240 [ 47.258468][ T7] rxrpc_discard_prealloc+0x60d/0x710 [ 47.263994][ T7] rxrpc_listen+0x246/0x370 [ 47.268629][ T7] afs_close_socket+0x57/0x280 [ 47.273872][ T7] ? afs_purge_servers+0x21f/0x280 [ 47.278973][ T7] ? init_wait_var_entry+0x150/0x150 [ 47.284253][ T7] afs_net_exit+0x4f/0x90 [ 47.288578][ T7] cleanup_net+0x708/0xba0 [ 47.292986][ T7] process_one_work+0x789/0xfc0 [ 47.297816][ T7] worker_thread+0xaa4/0x1460 [ 47.302479][ T7] kthread+0x37e/0x3a0 [ 47.306532][ T7] ? rcu_lock_release+0x20/0x20 [ 47.311369][ T7] ? kthread_blkcg+0xd0/0xd0 [ 47.315932][ T7] ret_from_fork+0x1f/0x30 [ 47.321669][ T7] Kernel Offset: disabled [ 47.325998][ T7] Rebooting in 86400 seconds..