[ 59.359900][ T6782] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6782 [ 59.369529][ T6782] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.375503][ T6782] CPU: 1 PID: 6782 Comm: systemd-rfkill Not tainted 5.8.0-rc1-syzkaller #0 [ 59.384087][ T6782] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.394124][ T6782] Call Trace: [ 59.397403][ T6782] dump_stack+0x18f/0x20d [ 59.401717][ T6782] check_preemption_disabled+0x20d/0x220 [ 59.407334][ T6782] ext4_mb_new_blocks+0xa4d/0x3b70 [ 59.412476][ T6782] ? ext4_ext_search_right+0x2ca/0xb20 [ 59.417993][ T6782] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 59.423707][ T6782] ext4_ext_map_blocks+0x201b/0x33e0 [ 59.428982][ T6782] ? ext4_ext_release+0x10/0x10 [ 59.433826][ T6782] ? down_write_killable+0x170/0x170 [ 59.439094][ T6782] ? ext4_es_lookup_extent+0x41d/0xd10 [ 59.444537][ T6782] ext4_map_blocks+0x4cb/0x1640 [ 59.449428][ T6782] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 59.454665][ T6782] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 59.460195][ T6782] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.466156][ T6782] ? prandom_u32_state+0xe/0x170 [ 59.471091][ T6782] ? __brelse+0x84/0xa0 [ 59.475229][ T6782] ? __ext4_new_inode+0x144/0x55e0 [ 59.480348][ T6782] ext4_getblk+0xad/0x520 [ 59.484721][ T6782] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 59.490461][ T6782] ? ext4_free_inode+0x1700/0x1700 [ 59.495561][ T6782] ext4_bread+0x7c/0x380 [ 59.499804][ T6782] ? ext4_getblk+0x520/0x520 [ 59.504376][ T6782] ? dquot_get_next_dqblk+0x180/0x180 [ 59.509907][ T6782] ext4_append+0x153/0x360 [ 59.514320][ T6782] ext4_mkdir+0x5e0/0xdf0 [ 59.518634][ T6782] ? ext4_rmdir+0xde0/0xde0 [ 59.523118][ T6782] ? security_inode_permission+0xc4/0xf0 [ 59.528732][ T6782] vfs_mkdir+0x419/0x690 [ 59.532959][ T6782] do_mkdirat+0x21e/0x280 [ 59.537274][ T6782] ? __ia32_sys_mknod+0xb0/0xb0 [ 59.542104][ T6782] ? do_syscall_64+0x1c/0xe0 [ 59.546676][ T6782] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.552648][ T6782] do_syscall_64+0x60/0xe0 [ 59.557049][ T6782] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.562935][ T6782] RIP: 0033:0x7efd55fdf687 [ 59.567324][ T6782] Code: Bad RIP value. [ 59.571454][ T6782] RSP: 002b:00007ffe6c116be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 59.579858][ T6782] RAX: ffffffffffffffda RBX: 00005560bd982985 RCX: 00007efd55fdf687 [ 59.587811][ T6782] RDX: 00007ffe6c116ab0 RSI: 00000000000001ed RDI: 00005560bd982985 [ 59.595798][ T6782] RBP: 00007efd55fdf680 R08: 0000000000000100 R09: 0000000000000000 [ 59.603759][ T6782] R10: 00005560bd982980 R11: 0000000000000246 R12: 00000000000001ed [ 59.611912][ T6782] R13: 00007ffe6c116d70 R14: 0000000000000000 R15: 0000000000000000 Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. 2020/06/16 07:19:56 fuzzer started 2020/06/16 07:19:56 connecting to host at 10.128.0.26:34761 2020/06/16 07:19:56 checking machine... 2020/06/16 07:19:56 checking revisions... 2020/06/16 07:19:56 testing simple program... syzkaller login: [ 64.748586][ T6793] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6793 [ 64.757801][ T6793] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.763995][ T6793] CPU: 0 PID: 6793 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 64.772232][ T6793] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.782272][ T6793] Call Trace: [ 64.785547][ T6793] dump_stack+0x18f/0x20d [ 64.789870][ T6793] check_preemption_disabled+0x20d/0x220 [ 64.795486][ T6793] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.800606][ T6793] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.806060][ T6793] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 64.811769][ T6793] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.817128][ T6793] ? ext4_ext_release+0x10/0x10 [ 64.821971][ T6793] ? down_write_killable+0x170/0x170 [ 64.827236][ T6793] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.832704][ T6793] ext4_map_blocks+0x4cb/0x1640 [ 64.837640][ T6793] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.843373][ T6793] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.848916][ T6793] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.854884][ T6793] ? prandom_u32_state+0xe/0x170 [ 64.859828][ T6793] ? __brelse+0x84/0xa0 [ 64.864064][ T6793] ? __ext4_new_inode+0x144/0x55e0 [ 64.869159][ T6793] ext4_getblk+0xad/0x520 [ 64.873538][ T6793] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 64.879412][ T6793] ? ext4_free_inode+0x1700/0x1700 [ 64.884684][ T6793] ext4_bread+0x7c/0x380 [ 64.888917][ T6793] ? ext4_getblk+0x520/0x520 [ 64.893616][ T6793] ? dquot_get_next_dqblk+0x180/0x180 [ 64.898996][ T6793] ext4_append+0x153/0x360 [ 64.903418][ T6793] ext4_mkdir+0x5e0/0xdf0 [ 64.907737][ T6793] ? ext4_rmdir+0xde0/0xde0 [ 64.912246][ T6793] ? security_inode_permission+0xc4/0xf0 [ 64.917956][ T6793] vfs_mkdir+0x419/0x690 [ 64.922195][ T6793] do_mkdirat+0x21e/0x280 [ 64.926611][ T6793] ? __ia32_sys_mknod+0xb0/0xb0 [ 64.931442][ T6793] ? do_syscall_64+0x1c/0xe0 [ 64.936013][ T6793] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.941987][ T6793] do_syscall_64+0x60/0xe0 [ 64.946390][ T6793] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.952276][ T6793] RIP: 0033:0x4b02a0 [ 64.956172][ T6793] Code: Bad RIP value. [ 64.960213][ T6793] RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 64.968624][ T6793] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0 [ 64.976586][ T6793] RDX: 00000000000001c0 RSI: 000000c000027360 RDI: ffffffffffffff9c [ 64.984548][ T6793] RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000 [ 64.992517][ T6793] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 65.000497][ T6793] R13: 000000000000009c R14: 000000000000009b R15: 0000000000000100 [ 65.036100][ T6808] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6808 [ 65.045561][ T6808] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.051451][ T6808] CPU: 0 PID: 6808 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.060025][ T6808] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.071041][ T6808] Call Trace: [ 65.074410][ T6808] dump_stack+0x18f/0x20d [ 65.078877][ T6808] check_preemption_disabled+0x20d/0x220 [ 65.084524][ T6808] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.089635][ T6808] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.095199][ T6808] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.101190][ T6808] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.106475][ T6808] ? ext4_ext_release+0x10/0x10 [ 65.111324][ T6808] ? down_write_killable+0x170/0x170 [ 65.116719][ T6808] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.122335][ T6808] ext4_map_blocks+0x4cb/0x1640 [ 65.127229][ T6808] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.134148][ T6808] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.139865][ T6808] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.145863][ T6808] ? prandom_u32_state+0xe/0x170 [ 65.150790][ T6808] ? __brelse+0x84/0xa0 [ 65.154931][ T6808] ? __ext4_new_inode+0x144/0x55e0 [ 65.160064][ T6808] ext4_getblk+0xad/0x520 [ 65.164380][ T6808] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 65.170086][ T6808] ? ext4_free_inode+0x1700/0x1700 [ 65.175206][ T6808] ext4_bread+0x7c/0x380 [ 65.179456][ T6808] ? ext4_getblk+0x520/0x520 [ 65.184041][ T6808] ? dquot_get_next_dqblk+0x180/0x180 [ 65.189423][ T6808] ext4_append+0x153/0x360 [ 65.193861][ T6808] ext4_mkdir+0x5e0/0xdf0 [ 65.198181][ T6808] ? ext4_rmdir+0xde0/0xde0 [ 65.202808][ T6808] ? security_inode_permission+0xc4/0xf0 [ 65.208437][ T6808] vfs_mkdir+0x419/0x690 [ 65.212672][ T6808] do_mkdirat+0x21e/0x280 [ 65.217005][ T6808] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.221855][ T6808] ? do_syscall_64+0x1c/0xe0 [ 65.226452][ T6808] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.232525][ T6808] do_syscall_64+0x60/0xe0 [ 65.236936][ T6808] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.242826][ T6808] RIP: 0033:0x45bed7 [ 65.246940][ T6808] Code: Bad RIP value. [ 65.250988][ T6808] RSP: 002b:00007ffeac6ac348 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 65.259389][ T6808] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 65.268392][ T6808] RDX: 0000000000000003 RSI: 00000000000001c0 RDI: 00007ffeac6ac520 [ 65.276346][ T6808] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000002fc0 [ 65.284298][ T6808] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 65.292253][ T6808] R13: 00007ffeac6ac520 R14: 8421084210842109 R15: 00007ffeac6ac52c [ 65.380430][ T6809] IPVS: ftp: loaded support on port[0] = 21 [ 65.419708][ T6809] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6809 [ 65.429548][ T6809] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.435796][ T6809] CPU: 1 PID: 6809 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.444433][ T6809] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.454472][ T6809] Call Trace: [ 65.457749][ T6809] dump_stack+0x18f/0x20d [ 65.462089][ T6809] check_preemption_disabled+0x20d/0x220 [ 65.467710][ T6809] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.472835][ T6809] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.478291][ T6809] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.484126][ T6809] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.489399][ T6809] ? ext4_ext_release+0x10/0x10 [ 65.494255][ T6809] ? down_write_killable+0x170/0x170 [ 65.499527][ T6809] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.504970][ T6809] ext4_map_blocks+0x4cb/0x1640 [ 65.509804][ T6809] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.514983][ T6809] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.520520][ T6809] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.526495][ T6809] ? prandom_u32_state+0xe/0x170 [ 65.531673][ T6809] ? __brelse+0x84/0xa0 [ 65.535811][ T6809] ? __ext4_new_inode+0x144/0x55e0 [ 65.540920][ T6809] ext4_getblk+0xad/0x520 [ 65.545248][ T6809] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 65.550964][ T6809] ? ext4_free_inode+0x1700/0x1700 [ 65.556066][ T6809] ext4_bread+0x7c/0x380 [ 65.560288][ T6809] ? ext4_getblk+0x520/0x520 [ 65.564857][ T6809] ? dquot_get_next_dqblk+0x180/0x180 [ 65.570214][ T6809] ext4_append+0x153/0x360 [ 65.574613][ T6809] ext4_mkdir+0x5e0/0xdf0 [ 65.579013][ T6809] ? ext4_rmdir+0xde0/0xde0 [ 65.583497][ T6809] ? security_inode_permission+0xc4/0xf0 [ 65.589129][ T6809] vfs_mkdir+0x419/0x690 [ 65.593371][ T6809] do_mkdirat+0x21e/0x280 [ 65.597682][ T6809] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.602519][ T6809] ? do_syscall_64+0x1c/0xe0 [ 65.607088][ T6809] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.613055][ T6809] do_syscall_64+0x60/0xe0 [ 65.617474][ T6809] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.623888][ T6809] RIP: 0033:0x45bed7 [ 65.627756][ T6809] Code: Bad RIP value. [ 65.631814][ T6809] RSP: 002b:00007ffeac6ac238 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 65.640200][ T6809] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7 [ 65.648498][ T6809] RDX: 00007ffeac6ac283 RSI: 00000000000001ff RDI: 00007ffeac6ac280 [ 65.657113][ T6809] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 65.665089][ T6809] R10: 0000000000000064 R11: 0000000000000202 R12: 00000000004185c0 [ 65.673054][ T6809] R13: 00007ffeac6ac270 R14: 0000000000000000 R15: 00007ffeac6ac280 [ 65.725090][ T6809] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6809 [ 65.735242][ T6809] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.741309][ T6809] CPU: 1 PID: 6809 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.749897][ T6809] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.759981][ T6809] Call Trace: [ 65.763284][ T6809] dump_stack+0x18f/0x20d [ 65.767633][ T6809] check_preemption_disabled+0x20d/0x220 [ 65.773305][ T6809] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.778437][ T6809] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.783902][ T6809] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.789619][ T6809] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.794912][ T6809] ? ext4_ext_release+0x10/0x10 [ 65.799785][ T6809] ? down_write_killable+0x170/0x170 [ 65.805159][ T6809] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.810632][ T6809] ext4_map_blocks+0x4cb/0x1640 [ 65.815500][ T6809] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.820701][ T6809] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.826258][ T6809] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.832352][ T6809] ? prandom_u32_state+0xe/0x170 [ 65.837278][ T6809] ? __brelse+0x84/0xa0 [ 65.841560][ T6809] ? __ext4_new_inode+0x144/0x55e0 [ 65.846660][ T6809] ext4_getblk+0xad/0x520 [ 65.850971][ T6809] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 65.856689][ T6809] ? ext4_free_inode+0x1700/0x1700 [ 65.861781][ T6809] ext4_bread+0x7c/0x380 [ 65.866003][ T6809] ? ext4_getblk+0x520/0x520 [ 65.870569][ T6809] ? dquot_get_next_dqblk+0x180/0x180 [ 65.875921][ T6809] ext4_append+0x153/0x360 [ 65.880334][ T6809] ext4_mkdir+0x5e0/0xdf0 [ 65.884649][ T6809] ? ext4_rmdir+0xde0/0xde0 [ 65.889134][ T6809] ? security_inode_permission+0xc4/0xf0 [ 65.894760][ T6809] vfs_mkdir+0x419/0x690 [ 65.898992][ T6809] do_mkdirat+0x21e/0x280 [ 65.903310][ T6809] ? __ia32_sys_mknod+0xb0/0xb0 [ 65.908146][ T6809] ? do_syscall_64+0x1c/0xe0 [ 65.912724][ T6809] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 65.919006][ T6809] do_syscall_64+0x60/0xe0 [ 65.923471][ T6809] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.929341][ T6809] RIP: 0033:0x45bed7 [ 65.933210][ T6809] Code: Bad RIP value. [ 65.937261][ T6809] RSP: 002b:00007ffeac6ac238 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 65.945655][ T6809] RAX: ffffffffffffffda RBX: 00000000000100b7 RCX: 000000000045bed7 [ 65.953781][ T6809] RDX: 00007ffeac6ac283 RSI: 00000000000001ff RDI: 00007ffeac6ac280 [ 65.961767][ T6809] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 2020/06/16 07:19:58 building call list... [ 65.969724][ T6809] R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000003 [ 65.977677][ T6809] R13: 00007ffeac6ac270 R14: 00000000000100a2 R15: 00007ffeac6ac280 [ 66.203569][ T21] tipc: TX() has been purged, node left! [ 66.715625][ T21] ================================================================== [ 66.723878][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 66.731764][ T21] Write of size 1 at addr ffff8880a74619e4 by task kworker/u4:1/21 [ 66.739640][ T21] [ 66.741986][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 66.750221][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.760277][ T21] Workqueue: netns cleanup_net [ 66.765034][ T21] Call Trace: [ 66.768326][ T21] dump_stack+0x18f/0x20d [ 66.772659][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.778199][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.783738][ T21] ? afs_put_call+0xa40/0xa40 [ 66.788416][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 66.795446][ T21] ? vprintk_func+0x97/0x1a6 [ 66.800042][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.805587][ T21] kasan_report.cold+0x1f/0x37 [ 66.810383][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.816015][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.821562][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 66.826932][ T21] ? afs_close_socket+0x320/0x320 [ 66.831957][ T21] ? afs_put_call+0xa40/0xa40 [ 66.836636][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 66.841758][ T21] ? afs_put_call+0xa40/0xa40 [ 66.846434][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.852854][ T21] rxrpc_call_completed+0xca/0xf0 [ 66.857886][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 66.863259][ T21] ? lock_sock_nested+0x94/0x110 [ 66.868205][ T21] rxrpc_listen+0x147/0x360 [ 66.872714][ T21] afs_close_socket+0x95/0x320 [ 66.877474][ T21] ? afs_purge_servers+0x16d/0x300 [ 66.882602][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 66.888066][ T21] ? init_wait_var_entry+0x200/0x200 [ 66.893365][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.899006][ T21] ? check_preemption_disabled+0x38/0x220 [ 66.904734][ T21] afs_net_exit+0x1bc/0x310 [ 66.909240][ T21] ? afs_net_init+0xe30/0xe30 [ 66.914034][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 66.919164][ T21] cleanup_net+0x511/0xa50 [ 66.923590][ T21] ? unregister_pernet_device+0x70/0x70 [ 66.929147][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.935135][ T21] process_one_work+0x965/0x1690 [ 66.940084][ T21] ? lock_release+0x800/0x800 [ 66.944761][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.950144][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 66.955091][ T21] worker_thread+0x96/0xe10 [ 66.959607][ T21] ? process_one_work+0x1690/0x1690 [ 66.964833][ T21] kthread+0x3b5/0x4a0 [ 66.968899][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.974620][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.980342][ T21] ret_from_fork+0x1f/0x30 [ 66.984768][ T21] [ 66.987091][ T21] Allocated by task 6809: [ 66.991461][ T21] save_stack+0x1b/0x40 [ 66.995619][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 67.001247][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 67.006618][ T21] afs_alloc_call+0x55/0x630 [ 67.011230][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 67.016694][ T21] afs_open_socket+0x292/0x360 [ 67.021451][ T21] afs_net_init+0xa6c/0xe30 [ 67.025947][ T21] ops_init+0xaf/0x420 [ 67.030007][ T21] setup_net+0x2de/0x860 [ 67.034245][ T21] copy_net_ns+0x293/0x590 [ 67.038657][ T21] create_new_namespaces+0x3fb/0xb30 [ 67.044011][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 67.049663][ T21] ksys_unshare+0x43d/0x8e0 [ 67.054163][ T21] __x64_sys_unshare+0x2d/0x40 [ 67.059030][ T21] do_syscall_64+0x60/0xe0 [ 67.063454][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.069333][ T21] [ 67.071655][ T21] Freed by task 21: [ 67.075993][ T21] save_stack+0x1b/0x40 [ 67.080170][ T21] __kasan_slab_free+0xf7/0x140 [ 67.085134][ T21] kfree+0x109/0x2b0 [ 67.089058][ T21] afs_put_call+0x585/0xa40 [ 67.093846][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 67.099232][ T21] rxrpc_listen+0x147/0x360 [ 67.103745][ T21] afs_close_socket+0x95/0x320 [ 67.108507][ T21] afs_net_exit+0x1bc/0x310 [ 67.113007][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 67.118113][ T21] cleanup_net+0x511/0xa50 [ 67.122532][ T21] process_one_work+0x965/0x1690 [ 67.127563][ T21] worker_thread+0x96/0xe10 [ 67.132067][ T21] kthread+0x3b5/0x4a0 [ 67.136627][ T21] ret_from_fork+0x1f/0x30 [ 67.141047][ T21] [ 67.143374][ T21] The buggy address belongs to the object at ffff8880a7461800 [ 67.143374][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 67.157943][ T21] The buggy address is located 484 bytes inside of [ 67.157943][ T21] 1024-byte region [ffff8880a7461800, ffff8880a7461c00) [ 67.171296][ T21] The buggy address belongs to the page: [ 67.176930][ T21] page:ffffea00029d1840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 67.186035][ T21] flags: 0xfffe0000000200(slab) [ 67.190924][ T21] raw: 00fffe0000000200 ffffea00029d0e88 ffffea00029b6f88 ffff8880aa000c40 [ 67.199519][ T21] raw: 0000000000000000 ffff8880a7461000 0000000100000002 0000000000000000 [ 67.208095][ T21] page dumped because: kasan: bad access detected [ 67.214521][ T21] [ 67.216840][ T21] Memory state around the buggy address: [ 67.222468][ T21] ffff8880a7461880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.230526][ T21] ffff8880a7461900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.238592][ T21] >ffff8880a7461980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.246647][ T21] ^ [ 67.253841][ T21] ffff8880a7461a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.262161][ T21] ffff8880a7461a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 67.270213][ T21] ================================================================== [ 67.278285][ T21] Disabling lock debugging due to kernel taint [ 67.284472][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 67.291056][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 67.300668][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.310722][ T21] Workqueue: netns cleanup_net [ 67.315491][ T21] Call Trace: [ 67.318778][ T21] dump_stack+0x18f/0x20d [ 67.323100][ T21] ? afs_wake_up_async_call+0x670/0x770 [ 67.328636][ T21] ? afs_put_call+0xa40/0xa40 [ 67.333306][ T21] panic+0x2e3/0x75c [ 67.337196][ T21] ? __warn_printk+0xf3/0xf3 [ 67.341803][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 67.347950][ T21] ? trace_hardirqs_on+0x55/0x220 [ 67.352970][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.358505][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.364042][ T21] ? afs_put_call+0xa40/0xa40 [ 67.368712][ T21] end_report+0x4d/0x53 [ 67.372865][ T21] kasan_report.cold+0xd/0x37 [ 67.377543][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 67.383178][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.388721][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 67.394084][ T21] ? afs_close_socket+0x320/0x320 [ 67.399111][ T21] ? afs_put_call+0xa40/0xa40 [ 67.403783][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 67.408889][ T21] ? afs_put_call+0xa40/0xa40 [ 67.413558][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 67.420082][ T21] rxrpc_call_completed+0xca/0xf0 [ 67.425107][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 67.430476][ T21] ? lock_sock_nested+0x94/0x110 [ 67.435413][ T21] rxrpc_listen+0x147/0x360 [ 67.439914][ T21] afs_close_socket+0x95/0x320 [ 67.444674][ T21] ? afs_purge_servers+0x16d/0x300 [ 67.449778][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 67.455232][ T21] ? init_wait_var_entry+0x200/0x200 [ 67.460601][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 67.466230][ T21] ? check_preemption_disabled+0x38/0x220 [ 67.471942][ T21] afs_net_exit+0x1bc/0x310 [ 67.476436][ T21] ? afs_net_init+0xe30/0xe30 [ 67.481106][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 67.486217][ T21] cleanup_net+0x511/0xa50 [ 67.490627][ T21] ? unregister_pernet_device+0x70/0x70 [ 67.496169][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 67.502144][ T21] process_one_work+0x965/0x1690 [ 67.507081][ T21] ? lock_release+0x800/0x800 [ 67.511749][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 67.517124][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 67.522060][ T21] worker_thread+0x96/0xe10 [ 67.526569][ T21] ? process_one_work+0x1690/0x1690 [ 67.531757][ T21] kthread+0x3b5/0x4a0 [ 67.535818][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.541536][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.547256][ T21] ret_from_fork+0x1f/0x30 [ 67.553152][ T21] Kernel Offset: disabled [ 67.557502][ T21] Rebooting in 86400 seconds..