ci starts bisection 2022-08-28 13:19:02.063957086 +0000 UTC m=+131477.965537865 bisecting fixing commit since 351bdbb6419ca988802882badadc321d384d0254 building syzkaller on e2d91b1d0dd8c8b4760986ec8114469246022bb8 testing commit 351bdbb6419ca988802882badadc321d384d0254 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 6a4d67338b24d384f8cdcc4810c377c48a51cc71a6e2277207f5bb564365d48d run #0: crashed: KASAN: use-after-free Read in notifier_call_chain run #1: crashed: KASAN: use-after-free Read in notifier_call_chain run #2: crashed: KASAN: use-after-free Read in notifier_call_chain run #3: crashed: KASAN: use-after-free Read in notifier_call_chain run #4: crashed: KASAN: use-after-free Read in notifier_call_chain run #5: crashed: KASAN: use-after-free Read in notifier_call_chain run #6: crashed: KASAN: use-after-free Read in notifier_call_chain run #7: crashed: KASAN: use-after-free Read in notifier_call_chain run #8: crashed: KASAN: use-after-free Read in notifier_call_chain run #9: crashed: KASAN: use-after-free Read in notifier_call_chain run #10: crashed: KASAN: use-after-free Read in notifier_call_chain run #11: crashed: KASAN: use-after-free Read in notifier_call_chain run #12: crashed: KASAN: use-after-free Read in notifier_call_chain run #13: crashed: KASAN: use-after-free Read in notifier_call_chain run #14: crashed: SYZFAIL: wrong response packet run #15: crashed: KASAN: use-after-free Read in notifier_call_chain run #16: crashed: KASAN: use-after-free Read in notifier_call_chain run #17: crashed: KASAN: use-after-free Read in notifier_call_chain run #18: crashed: KASAN: use-after-free Read in notifier_call_chain run #19: crashed: KASAN: use-after-free Read in notifier_call_chain testing current HEAD 53a406803ca5b0b1f91beffacad4321fae4fa2a7 testing commit 53a406803ca5b0b1f91beffacad4321fae4fa2a7 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: a165ae3d5fdef482a4893ecd00573ff0cab35618f4ad2894519a8a36dd31deaa run #0: crashed: KASAN: use-after-free Read in __fib6_clean_all run #1: crashed: KASAN: use-after-free Read in notifier_call_chain run #2: crashed: KASAN: use-after-free Read in notifier_call_chain run #3: crashed: KASAN: use-after-free Read in notifier_call_chain run #4: crashed: KASAN: use-after-free Read in notifier_call_chain run #5: crashed: KASAN: use-after-free Read in notifier_call_chain run #6: crashed: KASAN: use-after-free Read in notifier_call_chain run #7: crashed: KASAN: use-after-free Read in __fib6_clean_all run #8: crashed: KASAN: use-after-free Read in notifier_call_chain run #9: crashed: KASAN: use-after-free Read in notifier_call_chain revisions tested: 2, total time: 23m46.789857557s (build: 12m57.582103321s, test: 10m3.015237989s) the crash still happens on HEAD commit msg: net_sched: remove impossible conditions crash: KASAN: use-after-free Read in notifier_call_chain ================================================================== BUG: KASAN: use-after-free in notifier_call_chain+0x160/0x170 kernel/notifier.c:75 Read of size 8 at addr ffff88807c778268 by task syz-executor.0/4054 CPU: 1 PID: 4054 Comm: syz-executor.0 Not tainted 6.0.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 notifier_call_chain+0x160/0x170 kernel/notifier.c:75 call_netdevice_notifiers_info+0x69/0xd0 net/core/dev.c:1942 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] netdev_wait_allrefs_any net/core/dev.c:10250 [inline] netdev_run_todo+0x9ca/0xe90 net/core/dev.c:10364 tun_detach drivers/net/tun.c:704 [inline] tun_chr_close+0xbd/0x150 drivers/net/tun.c:3455 __fput+0x1f5/0x8c0 fs/file_table.c:320 task_work_run+0xc0/0x160 kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x966/0x2440 kernel/exit.c:795 do_group_exit+0xb2/0x2a0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f80d5689049 Code: Unable to access opcode bytes at RIP 0x7f80d568901f. RSP: 002b:00007ffd802265f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007ffd802267a0 RCX: 00007f80d5689049 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 RBP: 0000000000000000 R08: 0000000000000025 R09: 00007ffd802267a0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f80d56e305e R13: 000000000000001c R14: 0000000000000004 R15: 00007ffd802267e0 Allocated by task 4054: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3268 kmem_cache_zalloc include/linux/slab.h:723 [inline] net_alloc net/core/net_namespace.c:404 [inline] copy_net_ns+0xfe/0x5b0 net/core/net_namespace.c:459 create_new_namespaces+0x35a/0x920 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x86/0x1a0 kernel/nsproxy.c:227 ksys_unshare+0x309/0x6b0 kernel/fork.c:3183 __do_sys_unshare kernel/fork.c:3254 [inline] __se_sys_unshare kernel/fork.c:3252 [inline] __x64_sys_unshare+0x28/0x40 kernel/fork.c:3252 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4143: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kmem_cache_free+0xeb/0x5b0 mm/slub.c:3551 net_free net/core/net_namespace.c:433 [inline] net_free net/core/net_namespace.c:429 [inline] cleanup_net+0x6fc/0x980 net/core/net_namespace.c:616 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x294/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88807c778000 which belongs to the cache net_namespace of size 6784 The buggy address is located 616 bytes inside of 6784-byte region [ffff88807c778000, ffff88807c779a80) The buggy address belongs to the physical page: page:ffffea0001f1de00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807c77d280 pfn:0x7c778 head:ffffea0001f1de00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88801b19ca81 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8880101db3c0 raw: ffff88807c77d280 0000000080040002 00000001ffffffff ffff88801b19ca81 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4054, tgid 4054 (syz-executor.0), ts 60826931821, free_ts 60824727543 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x7f1/0xe00 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x38c/0x3b0 mm/slub.c:3268 kmem_cache_zalloc include/linux/slab.h:723 [inline] net_alloc net/core/net_namespace.c:404 [inline] copy_net_ns+0xfe/0x5b0 net/core/net_namespace.c:459 create_new_namespaces+0x35a/0x920 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x86/0x1a0 kernel/nsproxy.c:227 ksys_unshare+0x309/0x6b0 kernel/fork.c:3183 __do_sys_unshare kernel/fork.c:3254 [inline] __se_sys_unshare kernel/fork.c:3252 [inline] __x64_sys_unshare+0x28/0x40 kernel/fork.c:3252 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2548 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] kmem_cache_alloc_trace+0x2c0/0x3e0 mm/slub.c:3282 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ref_tracker_alloc+0x113/0x420 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:3970 [inline] netdev_hold include/linux/netdevice.h:3999 [inline] netdev_hold include/linux/netdevice.h:3994 [inline] register_netdevice+0xd68/0x1410 net/core/dev.c:10090 __ip_tunnel_create+0x31b/0x490 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x235/0x7d0 net/ipv4/ip_tunnel.c:1072 ops_init+0x91/0x3c0 net/core/net_namespace.c:135 setup_net+0x588/0xb40 net/core/net_namespace.c:326 copy_net_ns+0x29b/0x5b0 net/core/net_namespace.c:472 create_new_namespaces+0x35a/0x920 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x86/0x1a0 kernel/nsproxy.c:227 Memory state around the buggy address: ffff88807c778100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c778180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807c778200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807c778280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c778300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================