ci2 starts bisection 2023-06-16 08:13:29.539439955 +0000 UTC m=+38232.732236724 bisecting fixing commit since f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 building syzkaller on 11c89444716852a015f612f3b171a06781707777 ensuring issue is reproducible on original commit f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 testing commit f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: cfe083f766ac0e449c35e0cf07954c0aa559daf28c22705c5e870aadaf2dbd8c run #0: crashed: KASAN: use-after-free Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: use-after-free Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: use-after-free Read in ext4_search_dir run #5: crashed: KASAN: use-after-free Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: use-after-free Read in ext4_search_dir run #10: crashed: KASAN: slab-use-after-free Read in ext4_search_dir run #11: crashed: KASAN: use-after-free Read in ext4_search_dir run #12: crashed: KASAN: use-after-free Read in ext4_search_dir run #13: crashed: KASAN: use-after-free Read in ext4_search_dir run #14: crashed: KASAN: use-after-free Read in ext4_search_dir run #15: crashed: KASAN: use-after-free Read in ext4_search_dir run #16: crashed: KASAN: use-after-free Read in ext4_search_dir run #17: crashed: KASAN: use-after-free Read in ext4_search_dir run #18: crashed: KASAN: use-after-free Read in ext4_search_dir run #19: crashed: KASAN: use-after-free Read in ext4_search_dir testing current HEAD 40f71e7cd3c6ac04293556ab0504a372393838ff testing commit 40f71e7cd3c6ac04293556ab0504a372393838ff gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 2dd7ccb9872336442f50d5ef9ca95fbe47a98651c6120cae91dd7d1dbb247a4b run #0: crashed: KASAN: slab-use-after-free Read in ext4_search_dir run #1: crashed: KASAN: use-after-free Read in ext4_search_dir run #2: crashed: KASAN: out-of-bounds Read in ext4_search_dir run #3: crashed: KASAN: use-after-free Read in ext4_search_dir run #4: crashed: KASAN: out-of-bounds Read in ext4_search_dir run #5: crashed: KASAN: use-after-free Read in ext4_search_dir run #6: crashed: KASAN: use-after-free Read in ext4_search_dir run #7: crashed: KASAN: use-after-free Read in ext4_search_dir run #8: crashed: KASAN: use-after-free Read in ext4_search_dir run #9: crashed: KASAN: slab-use-after-free Read in ext4_search_dir crash still not fixed/happens on the oldest tested release revisions tested: 2, total time: 38m0.919155636s (build: 30m32.131403662s, test: 6m45.691179242s) crash still not fixed on HEAD or HEAD had kernel test errors commit msg: Merge tag 'net-6.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net crash: KASAN: slab-use-after-free Read in ext4_search_dir EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ================================================================== BUG: KASAN: slab-use-after-free in ext4_search_dir+0xc4/0x150 fs/ext4/namei.c:1539 Read of size 1 at addr ffff888076b393ed by task syz-executor.0/5445 CPU: 0 PID: 5445 Comm: syz-executor.0 Not tainted 6.4.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x167/0x220 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x163/0x540 mm/kasan/report.c:462 kasan_report+0x176/0x1b0 mm/kasan/report.c:572 ext4_search_dir+0xc4/0x150 fs/ext4/namei.c:1539 ext4_find_inline_entry+0x36b/0x540 fs/ext4/inline.c:1719 __ext4_find_entry+0x25b/0x1650 fs/ext4/namei.c:1612 ext4_lookup_entry fs/ext4/namei.c:1767 [inline] ext4_lookup+0x14e/0x600 fs/ext4/namei.c:1835 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0xde1/0x2c10 fs/namei.c:3788 do_filp_open+0x22a/0x440 fs/namei.c:3818 do_sys_openat2+0x10f/0x430 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x1ef/0x240 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc4eea8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc4ef83f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fc4eebabf80 RCX: 00007fc4eea8c169 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100 RBP: 00007fc4eeae7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffefe99ccff R14: 00007fc4ef83f300 R15: 0000000000022000 Allocated by task 7: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 slab_alloc_node mm/slub.c:3451 [inline] kmem_cache_alloc_node+0x157/0x350 mm/slub.c:3496 __alloc_skb+0x11e/0x3b0 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1288 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x297/0xa10 drivers/net/netdevsim/dev.c:853 process_one_work+0x797/0xe20 kernel/workqueue.c:2405 worker_thread+0x8c9/0xfd0 kernel/workqueue.c:2552 kthread+0x27c/0x2f0 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 7: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] kmem_cache_free+0x297/0x520 mm/slub.c:3808 nsim_dev_trap_report drivers/net/netdevsim/dev.c:824 [inline] nsim_dev_trap_report_work+0x21f/0xa10 drivers/net/netdevsim/dev.c:853 process_one_work+0x797/0xe20 kernel/workqueue.c:2405 worker_thread+0x8c9/0xfd0 kernel/workqueue.c:2552 kthread+0x27c/0x2f0 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff888076b393c0 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 45 bytes inside of freed 232-byte region [ffff888076b393c0, ffff888076b394a8) The buggy address belongs to the physical page: page:ffffea0001dace40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76b39 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff888142248500 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 7, tgid 7 (kworker/0:0), ts 59224725371, free_ts 57935915048 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502 __alloc_pages+0x255/0x670 mm/page_alloc.c:4768 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192 __slab_alloc mm/slub.c:3291 [inline] __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] kmem_cache_alloc_node+0x1f3/0x350 mm/slub.c:3496 __alloc_skb+0x11e/0x3b0 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1288 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x297/0xa10 drivers/net/netdevsim/dev.c:853 process_one_work+0x797/0xe20 kernel/workqueue.c:2405 worker_thread+0x8c9/0xfd0 kernel/workqueue.c:2552 kthread+0x27c/0x2f0 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2705 release_pages+0x1a0f/0x1bc0 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline] tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu+0xe9/0x1e0 mm/mmu_gather.c:299 tlb_finish_mmu+0xb6/0x1c0 mm/mmu_gather.c:391 exit_mmap+0x351/0x890 mm/mmap.c:3123 __mmput+0xcb/0x300 kernel/fork.c:1351 exit_mm+0x1de/0x290 kernel/exit.c:567 do_exit+0x4f2/0x1d10 kernel/exit.c:861 do_group_exit+0x1b9/0x280 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888076b39280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076b39300: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc >ffff888076b39380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff888076b39400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076b39480: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc 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