[ 55.867488][ T6777] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.867493][ T6777] Call Trace: [ 55.867515][ T6777] dump_stack+0x18f/0x20d [ 55.867536][ T6777] check_preemption_disabled+0x20d/0x220 [ 55.867551][ T6777] ext4_mb_new_blocks+0xa4d/0x3b70 [ 55.867579][ T6777] ? ext4_ext_search_right+0x2ca/0xb20 [ 55.867593][ T6777] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 55.867616][ T6777] ext4_ext_map_blocks+0x201b/0x33e0 [ 55.867640][ T6777] ? ext4_ext_release+0x10/0x10 [ 55.867673][ T6777] ? down_write_killable+0x170/0x170 [ 55.867685][ T6777] ? ext4_es_lookup_extent+0x41d/0xd10 [ 55.867707][ T6777] ext4_map_blocks+0x4cb/0x1640 [ 55.867729][ T6777] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 55.867743][ T6777] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.867758][ T6777] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 55.867771][ T6777] ? prandom_u32_state+0xe/0x170 [ 55.867787][ T6777] ? __brelse+0x84/0xa0 [ 55.867800][ T6777] ? __ext4_new_inode+0x144/0x55e0 [ 55.867818][ T6777] ext4_getblk+0xad/0x520 [ 55.867836][ T6777] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 55.867856][ T6777] ? ext4_free_inode+0x1700/0x1700 [ 55.867875][ T6777] ext4_bread+0x7c/0x380 [ 55.867889][ T6777] ? ext4_getblk+0x520/0x520 [ 55.867902][ T6777] ? dquot_get_next_dqblk+0x180/0x180 [ 55.867923][ T6777] ext4_append+0x153/0x360 [ 55.867943][ T6777] ext4_mkdir+0x5e0/0xdf0 [ 55.867964][ T6777] ? ext4_rmdir+0xde0/0xde0 [ 55.867982][ T6777] ? security_inode_permission+0xc4/0xf0 [ 55.868003][ T6777] vfs_mkdir+0x419/0x690 [ 55.868020][ T6777] do_mkdirat+0x21e/0x280 [ 55.868037][ T6777] ? __ia32_sys_mknod+0xb0/0xb0 [ 55.868050][ T6777] ? do_syscall_64+0x1c/0xe0 [ 55.868065][ T6777] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.868082][ T6777] do_syscall_64+0x60/0xe0 [ 55.868098][ T6777] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.868109][ T6777] RIP: 0033:0x7eff015e3687 [ 55.868114][ T6777] Code: Bad RIP value. [ 55.868122][ T6777] RSP: 002b:00007fffe49af658 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 55.868134][ T6777] RAX: ffffffffffffffda RBX: 0000557e92881985 RCX: 00007eff015e3687 [ 55.868142][ T6777] RDX: 00007fffe49af520 RSI: 00000000000001ed RDI: 0000557e92881985 [ 55.868148][ T6777] RBP: 00007eff015e3680 R08: 0000000000000100 R09: 0000000000000000 [ 55.868156][ T6777] R10: 0000557e92881980 R11: 0000000000000246 R12: 00000000000001ed [ 55.868163][ T6777] R13: 00007fffe49af7e0 R14: 0000000000000000 R15: 0000000000000000 Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.252' (ECDSA) to the list of known hosts. 2020/06/15 16:52:36 fuzzer started 2020/06/15 16:52:36 connecting to host at 10.128.0.26:37491 2020/06/15 16:52:36 checking machine... 2020/06/15 16:52:36 checking revisions... 2020/06/15 16:52:36 testing simple program... syzkaller login: [ 61.843409][ T6837] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6837 [ 61.852567][ T6837] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 61.858554][ T6837] CPU: 1 PID: 6837 Comm: syz-fuzzer Not tainted 5.7.0-syzkaller #0 [ 61.866480][ T6837] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.876515][ T6837] Call Trace: [ 61.879789][ T6837] dump_stack+0x18f/0x20d [ 61.884117][ T6837] check_preemption_disabled+0x20d/0x220 [ 61.889733][ T6837] ext4_mb_new_blocks+0xa4d/0x3b70 [ 61.894829][ T6837] ? ext4_ext_search_right+0x2ca/0xb20 [ 61.900266][ T6837] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 61.905984][ T6837] ext4_ext_map_blocks+0x201b/0x33e0 [ 61.911274][ T6837] ? ext4_ext_release+0x10/0x10 [ 61.916112][ T6837] ? down_write_killable+0x170/0x170 [ 61.921373][ T6837] ? ext4_es_lookup_extent+0x41d/0xd10 [ 61.926811][ T6837] ext4_map_blocks+0x4cb/0x1640 [ 61.931643][ T6837] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 61.936834][ T6837] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 61.942356][ T6837] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.948312][ T6837] ? prandom_u32_state+0xe/0x170 [ 61.953227][ T6837] ? __brelse+0x84/0xa0 [ 61.957403][ T6837] ? __ext4_new_inode+0x144/0x55e0 [ 61.962497][ T6837] ext4_getblk+0xad/0x520 [ 61.966806][ T6837] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 61.972507][ T6837] ? ext4_free_inode+0x1700/0x1700 [ 61.977685][ T6837] ext4_bread+0x7c/0x380 [ 61.981907][ T6837] ? ext4_getblk+0x520/0x520 [ 61.986473][ T6837] ? dquot_get_next_dqblk+0x180/0x180 [ 61.991825][ T6837] ext4_append+0x153/0x360 [ 61.996239][ T6837] ext4_mkdir+0x5e0/0xdf0 [ 62.000548][ T6837] ? ext4_rmdir+0xde0/0xde0 [ 62.005035][ T6837] ? security_inode_permission+0xc4/0xf0 [ 62.010665][ T6837] vfs_mkdir+0x419/0x690 [ 62.014888][ T6837] do_mkdirat+0x21e/0x280 [ 62.019196][ T6837] ? __ia32_sys_mknod+0xb0/0xb0 [ 62.024025][ T6837] ? do_syscall_64+0x1c/0xe0 [ 62.028593][ T6837] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.034550][ T6837] do_syscall_64+0x60/0xe0 [ 62.038972][ T6837] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.044849][ T6837] RIP: 0033:0x4b02a0 [ 62.048736][ T6837] Code: Bad RIP value. [ 62.052796][ T6837] RSP: 002b:000000c0000ed4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 62.061196][ T6837] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0 [ 62.069158][ T6837] RDX: 00000000000001c0 RSI: 000000c0000f2d20 RDI: ffffffffffffff9c [ 62.077106][ T6837] RBP: 000000c0000ed510 R08: 0000000000000000 R09: 0000000000000000 [ 62.085054][ T6837] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 62.093191][ T6837] R13: 000000000000006a R14: 0000000000000069 R15: 0000000000000100 [ 62.108627][ T6849] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6849 [ 62.118135][ T6849] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.124031][ T6849] CPU: 1 PID: 6849 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 62.132267][ T6849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.142924][ T6849] Call Trace: [ 62.146205][ T6849] dump_stack+0x18f/0x20d [ 62.150518][ T6849] check_preemption_disabled+0x20d/0x220 [ 62.156130][ T6849] ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.161232][ T6849] ? ext4_ext_search_right+0x2ca/0xb20 [ 62.166668][ T6849] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 62.172400][ T6849] ext4_ext_map_blocks+0x201b/0x33e0 [ 62.177680][ T6849] ? ext4_ext_release+0x10/0x10 [ 62.182628][ T6849] ? down_write_killable+0x170/0x170 [ 62.187931][ T6849] ? ext4_es_lookup_extent+0x41d/0xd10 [ 62.193378][ T6849] ext4_map_blocks+0x4cb/0x1640 [ 62.198213][ T6849] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 62.203390][ T6849] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.208923][ T6849] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.214877][ T6849] ? prandom_u32_state+0xe/0x170 [ 62.219793][ T6849] ? __brelse+0x84/0xa0 [ 62.224800][ T6849] ? __ext4_new_inode+0x144/0x55e0 [ 62.229999][ T6849] ext4_getblk+0xad/0x520 [ 62.234318][ T6849] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 62.240041][ T6849] ? ext4_free_inode+0x1700/0x1700 [ 62.245134][ T6849] ext4_bread+0x7c/0x380 [ 62.249355][ T6849] ? ext4_getblk+0x520/0x520 [ 62.253922][ T6849] ? dquot_get_next_dqblk+0x180/0x180 [ 62.259275][ T6849] ext4_append+0x153/0x360 [ 62.263673][ T6849] ext4_mkdir+0x5e0/0xdf0 [ 62.267986][ T6849] ? ext4_rmdir+0xde0/0xde0 [ 62.272471][ T6849] ? security_inode_permission+0xc4/0xf0 [ 62.278085][ T6849] vfs_mkdir+0x419/0x690 [ 62.282314][ T6849] do_mkdirat+0x21e/0x280 [ 62.286647][ T6849] ? __ia32_sys_mknod+0xb0/0xb0 [ 62.291494][ T6849] ? do_syscall_64+0x1c/0xe0 [ 62.296063][ T6849] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.302055][ T6849] do_syscall_64+0x60/0xe0 [ 62.306471][ T6849] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.312342][ T6849] RIP: 0033:0x45bed7 [ 62.316211][ T6849] Code: Bad RIP value. [ 62.320269][ T6849] RSP: 002b:00007ffe0c01b968 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 62.328671][ T6849] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 62.336633][ T6849] RDX: 0000000000000003 RSI: 00000000000001c0 RDI: 00007ffe0c01bb40 [ 62.344592][ T6849] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000003640 [ 62.352548][ T6849] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 62.360515][ T6849] R13: 00007ffe0c01bb40 R14: 8421084210842109 R15: 00007ffe0c01bb4c [ 62.445846][ T6850] IPVS: ftp: loaded support on port[0] = 21 [ 62.484859][ T6850] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6850 [ 62.494329][ T6850] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.500304][ T6850] CPU: 0 PID: 6850 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 62.508675][ T6850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.518807][ T6850] Call Trace: [ 62.522087][ T6850] dump_stack+0x18f/0x20d [ 62.526752][ T6850] check_preemption_disabled+0x20d/0x220 [ 62.532381][ T6850] ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.537498][ T6850] ? ext4_ext_search_right+0x2ca/0xb20 [ 62.542960][ T6850] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 62.548662][ T6850] ext4_ext_map_blocks+0x201b/0x33e0 [ 62.553953][ T6850] ? ext4_ext_release+0x10/0x10 [ 62.558812][ T6850] ? down_write_killable+0x170/0x170 [ 62.564079][ T6850] ? ext4_es_lookup_extent+0x41d/0xd10 [ 62.569544][ T6850] ext4_map_blocks+0x4cb/0x1640 [ 62.574378][ T6850] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 62.579559][ T6850] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.585090][ T6850] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.591046][ T6850] ? prandom_u32_state+0xe/0x170 [ 62.595963][ T6850] ? __brelse+0x84/0xa0 [ 62.600098][ T6850] ? __ext4_new_inode+0x144/0x55e0 [ 62.605190][ T6850] ext4_getblk+0xad/0x520 [ 62.609500][ T6850] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 62.615203][ T6850] ? ext4_free_inode+0x1700/0x1700 [ 62.620292][ T6850] ext4_bread+0x7c/0x380 [ 62.624529][ T6850] ? ext4_getblk+0x520/0x520 [ 62.629103][ T6850] ? dquot_get_next_dqblk+0x180/0x180 [ 62.634458][ T6850] ext4_append+0x153/0x360 [ 62.638858][ T6850] ext4_mkdir+0x5e0/0xdf0 [ 62.643169][ T6850] ? ext4_rmdir+0xde0/0xde0 [ 62.647682][ T6850] ? security_inode_permission+0xc4/0xf0 [ 62.653310][ T6850] vfs_mkdir+0x419/0x690 [ 62.657544][ T6850] do_mkdirat+0x21e/0x280 [ 62.661875][ T6850] ? __ia32_sys_mknod+0xb0/0xb0 [ 62.666709][ T6850] ? do_syscall_64+0x1c/0xe0 [ 62.671302][ T6850] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.677269][ T6850] do_syscall_64+0x60/0xe0 [ 62.681684][ T6850] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.687556][ T6850] RIP: 0033:0x45bed7 [ 62.691422][ T6850] Code: Bad RIP value. [ 62.695463][ T6850] RSP: 002b:00007ffe0c01b858 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 62.703858][ T6850] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7 [ 62.711806][ T6850] RDX: 00007ffe0c01b8a3 RSI: 00000000000001ff RDI: 00007ffe0c01b8a0 [ 62.719769][ T6850] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 62.727735][ T6850] R10: 0000000000000064 R11: 0000000000000202 R12: 00000000004185c0 [ 62.735685][ T6850] R13: 00007ffe0c01b890 R14: 0000000000000000 R15: 00007ffe0c01b8a0 [ 62.785186][ T6850] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6850 [ 62.794604][ T6850] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.800777][ T6850] CPU: 1 PID: 6850 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0 [ 62.809019][ T6850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.819089][ T6850] Call Trace: [ 62.822387][ T6850] dump_stack+0x18f/0x20d [ 62.826740][ T6850] check_preemption_disabled+0x20d/0x220 [ 62.832388][ T6850] ext4_mb_new_blocks+0xa4d/0x3b70 [ 62.837528][ T6850] ? ext4_ext_search_right+0x2ca/0xb20 [ 62.843005][ T6850] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 62.848756][ T6850] ext4_ext_map_blocks+0x201b/0x33e0 [ 62.854054][ T6850] ? ext4_ext_release+0x10/0x10 [ 62.858906][ T6850] ? down_write_killable+0x170/0x170 [ 62.864248][ T6850] ? ext4_es_lookup_extent+0x41d/0xd10 [ 62.869694][ T6850] ext4_map_blocks+0x4cb/0x1640 [ 62.874533][ T6850] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 62.879720][ T6850] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.885264][ T6850] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.891411][ T6850] ? prandom_u32_state+0xe/0x170 [ 62.896344][ T6850] ? __brelse+0x84/0xa0 [ 62.900478][ T6850] ? __ext4_new_inode+0x144/0x55e0 [ 62.905572][ T6850] ext4_getblk+0xad/0x520 [ 62.909904][ T6850] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 62.915634][ T6850] ? ext4_free_inode+0x1700/0x1700 [ 62.920732][ T6850] ext4_bread+0x7c/0x380 [ 62.924963][ T6850] ? ext4_getblk+0x520/0x520 [ 62.929574][ T6850] ? dquot_get_next_dqblk+0x180/0x180 [ 62.934950][ T6850] ext4_append+0x153/0x360 [ 62.939349][ T6850] ext4_mkdir+0x5e0/0xdf0 [ 62.943662][ T6850] ? ext4_rmdir+0xde0/0xde0 [ 62.948148][ T6850] ? security_inode_permission+0xc4/0xf0 [ 62.953787][ T6850] vfs_mkdir+0x419/0x690 [ 62.958013][ T6850] do_mkdirat+0x21e/0x280 [ 62.962337][ T6850] ? __ia32_sys_mknod+0xb0/0xb0 [ 62.967170][ T6850] ? do_syscall_64+0x1c/0xe0 [ 62.971735][ T6850] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.977693][ T6850] do_syscall_64+0x60/0xe0 2020/06/15 16:52:37 building call list... [ 62.982105][ T6850] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.987972][ T6850] RIP: 0033:0x45bed7 [ 62.991857][ T6850] Code: Bad RIP value. [ 62.995900][ T6850] RSP: 002b:00007ffe0c01b858 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 [ 63.004294][ T6850] RAX: ffffffffffffffda RBX: 000000000000f543 RCX: 000000000045bed7 [ 63.012257][ T6850] RDX: 00007ffe0c01b8a3 RSI: 00000000000001ff RDI: 00007ffe0c01b8a0 [ 63.020206][ T6850] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 [ 63.028170][ T6850] R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000003 [ 63.036122][ T6850] R13: 00007ffe0c01b890 R14: 000000000000f533 R15: 00007ffe0c01b8a0 [ 63.285282][ T7] tipc: TX() has been purged, node left! [ 63.807147][ T7] ================================================================== [ 63.815382][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 63.823269][ T7] Write of size 1 at addr ffff88809a28c1e4 by task kworker/u4:0/7 [ 63.831060][ T7] [ 63.833391][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.7.0-syzkaller #0 [ 63.841181][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.851242][ T7] Workqueue: netns cleanup_net [ 63.855997][ T7] Call Trace: [ 63.859286][ T7] dump_stack+0x18f/0x20d [ 63.863615][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.869156][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.874694][ T7] ? afs_put_call+0xa40/0xa40 [ 63.879371][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 63.886421][ T7] ? vprintk_func+0x97/0x1a6 [ 63.891011][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.896552][ T7] kasan_report.cold+0x1f/0x37 [ 63.901318][ T7] ? rcu_read_lock_held+0x81/0xb0 [ 63.906341][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.911890][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 63.918058][ T7] ? afs_close_socket+0x320/0x320 [ 63.923080][ T7] ? afs_put_call+0xa40/0xa40 [ 63.927759][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 63.932869][ T7] ? afs_put_call+0xa40/0xa40 [ 63.938080][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.944494][ T7] rxrpc_call_completed+0xca/0xf0 [ 63.949523][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 63.954895][ T7] ? lock_sock_nested+0x94/0x110 [ 63.959833][ T7] rxrpc_listen+0x147/0x360 [ 63.964337][ T7] afs_close_socket+0x95/0x320 [ 63.969117][ T7] ? afs_purge_servers+0x16d/0x300 [ 63.974239][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 63.979715][ T7] ? init_wait_var_entry+0x200/0x200 [ 63.985004][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.990641][ T7] ? check_preemption_disabled+0x38/0x220 [ 63.996368][ T7] afs_net_exit+0x1bc/0x310 [ 64.000870][ T7] ? afs_net_init+0xe30/0xe30 [ 64.005544][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 64.010666][ T7] cleanup_net+0x511/0xa50 [ 64.015086][ T7] ? unregister_pernet_device+0x70/0x70 [ 64.020645][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.026688][ T7] process_one_work+0x965/0x1690 [ 64.031658][ T7] ? lock_release+0x800/0x800 [ 64.036434][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.041811][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 64.046771][ T7] worker_thread+0x96/0xe10 [ 64.051322][ T7] ? process_one_work+0x1690/0x1690 [ 64.056656][ T7] kthread+0x3b5/0x4a0 [ 64.060729][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.066444][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.072168][ T7] ret_from_fork+0x1f/0x30 [ 64.076598][ T7] [ 64.078920][ T7] Allocated by task 6850: [ 64.083257][ T7] save_stack+0x1b/0x40 [ 64.087411][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.093042][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.098413][ T7] afs_alloc_call+0x55/0x630 [ 64.103000][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 64.108452][ T7] afs_open_socket+0x292/0x360 [ 64.113213][ T7] afs_net_init+0xa6c/0xe30 [ 64.117719][ T7] ops_init+0xaf/0x420 [ 64.121785][ T7] setup_net+0x2de/0x860 [ 64.126022][ T7] copy_net_ns+0x293/0x590 [ 64.130436][ T7] create_new_namespaces+0x3fb/0xb30 [ 64.135727][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.141358][ T7] ksys_unshare+0x43d/0x8e0 [ 64.145881][ T7] __x64_sys_unshare+0x2d/0x40 [ 64.150643][ T7] do_syscall_64+0x60/0xe0 [ 64.155064][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.160941][ T7] [ 64.163262][ T7] Freed by task 7: [ 64.167156][ T7] save_stack+0x1b/0x40 [ 64.171309][ T7] __kasan_slab_free+0xf7/0x140 [ 64.176154][ T7] kfree+0x109/0x2b0 [ 64.180044][ T7] afs_put_call+0x585/0xa40 [ 64.184544][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 64.189909][ T7] rxrpc_listen+0x147/0x360 [ 64.194408][ T7] afs_close_socket+0x95/0x320 [ 64.199172][ T7] afs_net_exit+0x1bc/0x310 [ 64.203674][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 64.208779][ T7] cleanup_net+0x511/0xa50 [ 64.213192][ T7] process_one_work+0x965/0x1690 [ 64.218129][ T7] worker_thread+0x96/0xe10 [ 64.222625][ T7] kthread+0x3b5/0x4a0 [ 64.226778][ T7] ret_from_fork+0x1f/0x30 [ 64.231182][ T7] [ 64.233515][ T7] The buggy address belongs to the object at ffff88809a28c000 [ 64.233515][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 64.247562][ T7] The buggy address is located 484 bytes inside of [ 64.247562][ T7] 1024-byte region [ffff88809a28c000, ffff88809a28c400) [ 64.260912][ T7] The buggy address belongs to the page: [ 64.266544][ T7] page:ffffea000268a300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 64.275647][ T7] flags: 0xfffe0000000200(slab) [ 64.280500][ T7] raw: 00fffe0000000200 ffffea00024e3648 ffffea00029bbdc8 ffff8880aa000c40 [ 64.289086][ T7] raw: 0000000000000000 ffff88809a28c000 0000000100000002 0000000000000000 [ 64.297664][ T7] page dumped because: kasan: bad access detected [ 64.304085][ T7] [ 64.306420][ T7] Memory state around the buggy address: [ 64.312046][ T7] ffff88809a28c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.320106][ T7] ffff88809a28c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.328166][ T7] >ffff88809a28c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.336250][ T7] ^ [ 64.343441][ T7] ffff88809a28c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.351501][ T7] ffff88809a28c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.359559][ T7] ================================================================== [ 64.367703][ T7] Disabling lock debugging due to kernel taint [ 64.373950][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 64.380536][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.7.0-syzkaller #0 [ 64.389711][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.399758][ T7] Workqueue: netns cleanup_net [ 64.404509][ T7] Call Trace: [ 64.407796][ T7] dump_stack+0x18f/0x20d [ 64.412117][ T7] ? afs_wake_up_async_call+0x5f0/0x770 [ 64.417653][ T7] ? afs_put_call+0xa40/0xa40 [ 64.422321][ T7] panic+0x2e3/0x75c [ 64.426234][ T7] ? __warn_printk+0xf3/0xf3 [ 64.430847][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 64.436994][ T7] ? trace_hardirqs_on+0x55/0x220 [ 64.442009][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.447540][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.453070][ T7] ? afs_put_call+0xa40/0xa40 [ 64.457738][ T7] end_report+0x4d/0x53 [ 64.461886][ T7] kasan_report.cold+0xd/0x37 [ 64.466557][ T7] ? rcu_read_lock_held+0x81/0xb0 [ 64.471570][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.477116][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 64.482476][ T7] ? afs_close_socket+0x320/0x320 [ 64.487490][ T7] ? afs_put_call+0xa40/0xa40 [ 64.492157][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 64.497260][ T7] ? afs_put_call+0xa40/0xa40 [ 64.501938][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.508342][ T7] rxrpc_call_completed+0xca/0xf0 [ 64.513371][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 64.518756][ T7] ? lock_sock_nested+0x94/0x110 [ 64.523713][ T7] rxrpc_listen+0x147/0x360 [ 64.528212][ T7] afs_close_socket+0x95/0x320 [ 64.532967][ T7] ? afs_purge_servers+0x16d/0x300 [ 64.538091][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 64.543541][ T7] ? init_wait_var_entry+0x200/0x200 [ 64.548820][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.554442][ T7] ? check_preemption_disabled+0x38/0x220 [ 64.560155][ T7] afs_net_exit+0x1bc/0x310 [ 64.564649][ T7] ? afs_net_init+0xe30/0xe30 [ 64.569311][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 64.574412][ T7] cleanup_net+0x511/0xa50 [ 64.578818][ T7] ? unregister_pernet_device+0x70/0x70 [ 64.584358][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.590348][ T7] process_one_work+0x965/0x1690 [ 64.595300][ T7] ? lock_release+0x800/0x800 [ 64.599983][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.605360][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 64.610305][ T7] worker_thread+0x96/0xe10 [ 64.614817][ T7] ? process_one_work+0x1690/0x1690 [ 64.620016][ T7] kthread+0x3b5/0x4a0 [ 64.624088][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.629811][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.635534][ T7] ret_from_fork+0x1f/0x30 [ 64.641174][ T7] Kernel Offset: disabled [ 64.645538][ T7] Rebooting in 86400 seconds..