ci2 starts bisection 2025-05-14 18:36:57.175695448 +0000 UTC m=+21507.104301658
bisecting fixing commit since d2bafcf224f3911b183113b2fcb536c9e90684a3
building syzkaller on d7d323527f8e6073ec1da024a08c26f50626254f
ensuring issue is reproducible on original commit d2bafcf224f3911b183113b2fcb536c9e90684a3

testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: e8166090eb1df0f8e8f14777a61a96a735bf1c8ae019210d2816dd6f2b157506
all runs: crashed: KASAN: use-after-free Read in ext4_inlinedir_to_tree
representative crash: KASAN: use-after-free Read in ext4_inlinedir_to_tree, types: [KASAN]
check whether we can drop unnecessary instrumentation
disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed
testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: 57e1b281405a90f13288a95ca2feab49c1ad88dda222cf3b7d78fa0de5b452b5
all runs: crashed: KASAN: use-after-free Read in ext4_inlinedir_to_tree
representative crash: KASAN: use-after-free Read in ext4_inlinedir_to_tree, types: [KASAN]
the bug reproduces without the instrumentation
disabling configs for [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed
kconfig minimization: base=4080 full=8129 leaves diff=2136
split chunks (needed=false): <2136>
split chunk #0 of len 2136 into 5 parts
testing without sub-chunk 1/5
disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: 434cabdd2c9be449e28e52305d02e02f3448a7508d8715a8283ae35c98575596
run #0: crashed: KASAN: out-of-bounds Read in ext4_read_inline_data
run #1: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #2: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #3: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #4: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #5: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #6: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #7: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #8: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #9: crashed: KASAN: use-after-free Read in ext4_read_inline_data
representative crash: KASAN: out-of-bounds Read in ext4_read_inline_data, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: f43ed166dd5fa9e2f66b4c3fcfdb76207d9d705166b8af0041104d84699c1a1b
run #0: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #1: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #2: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #3: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #4: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #5: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data
run #7: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #8: crashed: KASAN: use-after-free Read in ext4_read_inline_data
run #9: crashed: KASAN: use-after-free Read in ext4_read_inline_data
representative crash: KASAN: use-after-free Read in ext4_read_inline_data, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed
testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: a758d837ddbeb5334e13f70ca7e208a8d16f31801c47f47f9a48035a802ccbb9
all runs: crashed: KASAN: use-after-free Read in ext4_read_inline_data
representative crash: KASAN: use-after-free Read in ext4_read_inline_data, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed
testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: 3de9764ca8613815ce274ffe12f8132d468afbbb68630f3fc8b4e30caad38141
all runs: crashed: KASAN: use-after-free Read in ext4_read_inline_data
representative crash: KASAN: use-after-free Read in ext4_read_inline_data, types: [KASAN]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed
testing commit d2bafcf224f3911b183113b2fcb536c9e90684a3 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: d3359898674c1dca3c66fe005a108d9ba684e858be9db06d385e9acaa7156cf8
all runs: crashed: KASAN: use-after-free Read in ext4_read_inline_data
representative crash: KASAN: use-after-free Read in ext4_read_inline_data, types: [KASAN]
the chunk can be dropped
disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed
testing current HEAD c94d59a126cb9a8d1f71e3e044363d654dcd7af8
testing commit c94d59a126cb9a8d1f71e3e044363d654dcd7af8 gcc
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
kernel signature: 8b8ded2ed5d30a3ed99536d331feb04846242b7c537c975379a988ca6ce37502
all runs: crashed: KASAN: use-after-free Read in ext4_read_inline_data
representative crash: KASAN: use-after-free Read in ext4_read_inline_data, types: [KASAN]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 2h21m31.349962365s (build: 1h12m44.496805704s, test: 57m22.846435039s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'trace-v6.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
crash: KASAN: use-after-free Read in ext4_read_inline_data
EXT4-fs error (device loop0): htree_dirblock_to_tree:1082: inode #2: block 21: comm syz-executor: bad entry in directory: directory entry overrun - offset=1004, inode=0, rec_len=1000, size=1024 fake=0
==================================================================
BUG: KASAN: use-after-free in ext4_read_inline_data+0x18f/0x280 fs/ext4/inline.c:214
Read of size 324 at addr ffff8881298f8c05 by task syz-executor/2884

CPU: 0 UID: 0 PID: 2884 Comm: syz-executor Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xf4/0x170 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xb4/0x290 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x29a/0x2b0 mm/kasan/generic.c:189
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 ext4_read_inline_data+0x18f/0x280 fs/ext4/inline.c:214
 ext4_inlinedir_to_tree+0x2db/0xac0 fs/ext4/inline.c:1301
 ext4_htree_fill_tree+0x3cb/0xef0 fs/ext4/namei.c:1181
 ext4_dx_readdir fs/ext4/dir.c:601 [inline]
 ext4_readdir+0x233a/0x2d10 fs/ext4/dir.c:146
 iterate_dir+0x1a7/0x4c0 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0xd3/0x1a0 fs/readdir.c:389
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8f/0x170 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4fcddcc013
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 52 43 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8
RSP: 002b:00007fff3af56c48 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555573c61520 RCX: 00007f4fcddcc013
RDX: 0000000000008000 RSI: 0000555573c61520 RDI: 0000000000000006
RBP: 0000555573c614f4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000016 R14: 0000555573c614f0 R15: 00007fff3af59fe0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x6 pfn:0x1298f8
flags: 0x200000000000000(node=0|zone=2)
page_type: f0(buddy)
raw: 0200000000000000 ffffea0004aa6208 ffff88823fffade8 0000000000000000
raw: 0000000000000006 0000000000000003 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 2966, tgid 2966 (modprobe), ts 87180633347, free_ts 87188359572
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xec/0x120 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x2bf4/0x2db0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x26b/0x460 mm/page_alloc.c:4970
 alloc_pages_mpol+0xcb/0x270 mm/mempolicy.c:2301
 folio_alloc_mpol_noprof mm/mempolicy.c:2320 [inline]
 vma_alloc_folio_noprof+0x288/0x400 mm/mempolicy.c:2355
 folio_prealloc+0x24/0xf0 mm/memory.c:-1
 wp_page_copy mm/memory.c:3478 [inline]
 do_wp_page+0xaae/0x2db0 mm/memory.c:3939
 handle_pte_fault mm/memory.c:6013 [inline]
 __handle_mm_fault mm/memory.c:6140 [inline]
 handle_mm_fault+0x727/0x2100 mm/memory.c:6309
 do_user_addr_fault+0x31a/0xc30 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x54/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 2966 tgid 2966 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 free_unref_folios+0xa6f/0x11b0 mm/page_alloc.c:2782
 folios_put_refs+0x319/0x400 mm/swap.c:992
 free_pages_and_swap_cache+0x20d/0x3c0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu+0x2ba/0x500 mm/mmu_gather.c:404
 tlb_finish_mmu+0xaa/0x190 mm/mmu_gather.c:496
 exit_mmap+0x3b5/0x8b0 mm/mmap.c:1297
 __mmput+0x62/0x290 kernel/fork.c:1379
 exit_mm+0x11b/0x1b0 kernel/exit.c:589
 do_exit+0x66b/0x2020 kernel/exit.c:940
 do_group_exit+0x1b1/0x280 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8f/0x170 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8881298f8b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881298f8b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881298f8c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8881298f8c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881298f8d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================