ci2 starts bisection 2026-08-05 00:45:16.268241374 +0000 UTC m=+41663.684230607
bisecting fixing commit since 93741761e5e3fa630ddc1fc19a460ac42baece80
building syzkaller on de5aae85e5f28e2fa1c7deefcc24fe286abe5140
ensuring issue is reproducible on original commit 93741761e5e3fa630ddc1fc19a460ac42baece80

testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: b8d5457ed556eb84d0e52b76fa7e9d208bfc9c0ab1551a280c4cc09caf1e66f7
run #0: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #1: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #2: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #3: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #4: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #5: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #6: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #7: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #8: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #9: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #10: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #11: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #12: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #13: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #14: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #15: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #16: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #17: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #18: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #19: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
check whether we can drop unnecessary instrumentation
disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed
testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 81e68fead751e0d056418c59c3933913333db2b986642350e3d3b7d11419df20
all runs: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
the bug reproduces without the instrumentation
disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed
kconfig minimization: base=3707 full=7425 leaves diff=2099
split chunks (needed=false): <2099>
split chunk #0 of len 2099 into 5 parts
testing without sub-chunk 1/5
disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed
testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 21a982d7a9c506ca3720c38093dbf31e912211938d958004dc1aa7d6f7b08b27
all runs: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed
testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 477673d314806fd5a5209fa835381fd50e3dd46099141863aa17a711b3433f2d
run #0: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #2: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #3: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #4: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #5: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #6: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #7: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #8: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #9: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 93b38a1887123c1ebc15d3ffd12c5a9935dc411b12966d0746af2b606a45028b
all runs: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed
testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 3a2a13421bed377935034812dd516d5da5ebaa203b0bff5f5a15aa05a3cdb952
run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #1: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #2: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #3: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #4: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #6: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #7: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #8: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #9: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing commit 93741761e5e3fa630ddc1fc19a460ac42baece80 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: e6c5beb9a591ecdac1fede9b991e97f8d771900c1771bca93113cfef99ad90ac
run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #1: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #2: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #3: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #4: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #5: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #6: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #7: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #8: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #9: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ]
the chunk can be dropped
disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed
testing current HEAD 6e2fd6534337574c1b553646a7e0c9cc641c0494
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 94610ddb082f352c7f2ad2f036b2b4211c8973e54a25589c5a1d3554a5770e76
run #0: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #3: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #5: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_get_inode_usage
run #7: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #8: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
run #9: crashed: KASAN: use-after-free Read in ext4_get_inode_usage
representative crash: KASAN: use-after-free Read in ext4_get_inode_usage, types: [KASAN-USE-AFTER-FREE-READ KASAN-READ]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 1h59m15.320684392s (build: 52m1.789721163s, test: 51m22.036562466s)
crash still not fixed or there were kernel test errors
commit msg: Linux 5.15.213
crash: KASAN: use-after-free Read in ext4_get_inode_usage
System zones: 0-1, 3-36
EXT4-fs (loop3): mounted filesystem without journal. Opts: grpquota,delalloc,resuid=0x0000000000000000,debug,dioread_nolock,bsddf,nomblk_io_submit,noauto_da_alloc,,errors=continue. Quota mode: writeback.
==================================================================
BUG: KASAN: use-after-free in ext4_get_inode_usage+0x704/0x820 fs/ext4/xattr.c:821
Read of size 4 at addr ffff88811a19b070 by task syz.3.17/2582

CPU: 1 PID: 2582 Comm: syz.3.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x41/0x5e lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:451
 ext4_get_inode_usage+0x704/0x820 fs/ext4/xattr.c:821
 __dquot_transfer+0x1a8/0x15c0 fs/quota/dquot.c:2037
 dquot_transfer+0x238/0x3c0 fs/quota/dquot.c:2189
 ext4_setattr+0x3b6/0x1d60 fs/ext4/inode.c:5477
 notify_change+0x4b4/0xea0 fs/attr.c:505
 chown_common+0x4c5/0x5f0 fs/open.c:680
 vfs_fchown fs/open.c:748 [inline]
 vfs_fchown fs/open.c:740 [inline]
 ksys_fchown+0xbb/0x110 fs/open.c:759
 __do_sys_fchown fs/open.c:767 [inline]
 __se_sys_fchown fs/open.c:765 [inline]
 __x64_sys_fchown+0x6a/0xb0 fs/open.c:765
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f78dd718e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f78dd57b028 EFLAGS: 00000246 ORIG_RAX: 000000000000005d
RAX: ffffffffffffffda RBX: 00007f78dd991fa0 RCX: 00007f78dd718e59
RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f78dd7aed6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f78dd992038 R14: 00007f78dd991fa0 R15: 00007ffdf5fb8778
 </TASK>

Allocated by task 2525:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x61/0x80 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x211/0x310 mm/slub.c:3238
 vm_area_alloc+0x17/0xf0 kernel/fork.c:351
 __mmap_region mm/mmap.c:1782 [inline]
 mmap_region+0x778/0x1000 mm/mmap.c:2933
 do_mmap+0x624/0xe70 mm/mmap.c:1586
 vm_mmap_pgoff+0x160/0x200 mm/util.c:551
 ksys_mmap_pgoff+0x396/0x570 mm/mmap.c:1635
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 2525:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook mm/slub.c:1736 [inline]
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0x7e/0x450 mm/slub.c:3520
 remove_vma mm/mmap.c:188 [inline]
 exit_mmap+0x255/0x580 mm/mmap.c:3227
 __mmput kernel/fork.c:1128 [inline]
 mmput+0x90/0x390 kernel/fork.c:1149
 exit_mm kernel/exit.c:557 [inline]
 do_exit+0x90a/0x2270 kernel/exit.c:877
 do_group_exit+0xe7/0x290 kernel/exit.c:1004
 __do_sys_exit_group kernel/exit.c:1015 [inline]
 __se_sys_exit_group kernel/exit.c:1013 [inline]
 __x64_sys_exit_group+0x35/0x40 kernel/exit.c:1013
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88811a19b000
 which belongs to the cache vm_area_struct of size 192
The buggy address is located 112 bytes inside of
 192-byte region [ffff88811a19b000, ffff88811a19b0c0)
The buggy address belongs to the page:
page:ffffea00046866c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a19b
flags: 0x200000000000200(slab|node=0|zone=2)
raw: 0200000000000200 ffffea00043cd9c0 0000000200000002 ffff88810012fa00
raw: 0000000000000000 0000000000100010 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 482, ts 10415982769, free_ts 0
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1319/0x2e50 mm/page_alloc.c:4192
 __alloc_pages+0x2b3/0x590 mm/page_alloc.c:5501
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab+0x2eb/0x430 mm/slub.c:1917
 new_slab mm/slub.c:1980 [inline]
 ___slab_alloc+0xb1c/0xf80 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x2d7/0x310 mm/slub.c:3238
 vm_area_dup+0x73/0x280 kernel/fork.c:359
 dup_mmap kernel/fork.c:558 [inline]
 dup_mm kernel/fork.c:1467 [inline]
 copy_mm kernel/fork.c:1519 [inline]
 copy_process+0x507b/0x7050 kernel/fork.c:2291
 kernel_clone+0xb8/0x920 kernel/fork.c:2681
 __do_sys_clone+0xa8/0xe0 kernel/fork.c:2798
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811a19af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811a19af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811a19b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff88811a19b080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88811a19b100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================