ci2 starts bisection 2026-07-05 08:20:09.053768675 +0000 UTC m=+127802.879672281 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: slab-out-of-bounds 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 [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: 81e68fead751e0d056418c59c3933913333db2b986642350e3d3b7d11419df20 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 bug reproduces without the instrumentation disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], 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 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: slab-out-of-bounds 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: 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 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: 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: slab-out-of-bounds 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 [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: 93b38a1887123c1ebc15d3ffd12c5a9935dc411b12966d0746af2b606a45028b 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: slab-out-of-bounds 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] the chunk can be dropped testing without sub-chunk 4/5 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: 3a2a13421bed377935034812dd516d5da5ebaa203b0bff5f5a15aa05a3cdb952 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 5/5 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: e6c5beb9a591ecdac1fede9b991e97f8d771900c1771bca93113cfef99ad90ac 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: 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] the chunk can be dropped disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing current HEAD c86c4726e7f044ab73b493c6f00527aafef640cd testing commit c86c4726e7f044ab73b493c6f00527aafef640cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 47fdb3ced08beab75968db4150a98ea54947583f6e10738b7f0939ec8acbb26c 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: slab-out-of-bounds 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] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 1h34m39.615182446s (build: 25m31.714139187s, test: 52m52.722852989s) crash still not fixed or there were kernel test errors commit msg: Linux 5.15.211 crash: KASAN: use-after-free Read in ext4_get_inode_usage EXT4-fs (loop3): Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE [EXT4 FS bs=1024, gc=1, bpg=131072, ipg=32, mo=e855c01c, mo2=0003] 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 ffff88810de3f070 by task syz.3.17/2583 CPU: 0 PID: 2583 Comm: syz.3.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __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: 0033:0x7f1d378d4e59 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:00007f1d37737028 EFLAGS: 00000246 ORIG_RAX: 000000000000005d RAX: ffffffffffffffda RBX: 00007f1d37b4dfa0 RCX: 00007f1d378d4e59 RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f1d3796ad6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1d37b4e038 R14: 00007f1d37b4dfa0 R15: 00007ffd8ea04198 Allocated by task 2404: 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_dup+0x73/0x280 kernel/fork.c:359 __split_vma+0x88/0x420 mm/mmap.c:2730 mprotect_fixup+0x595/0x820 mm/mprotect.c:483 do_mprotect_pkey+0x3c5/0x750 mm/mprotect.c:636 __do_sys_mprotect mm/mprotect.c:662 [inline] __se_sys_mprotect mm/mprotect.c:659 [inline] __x64_sys_mprotect+0x6f/0xb0 mm/mprotect.c:659 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 2404: 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:551 [inline] do_exit+0x90a/0x2270 kernel/exit.c:871 do_group_exit+0xe7/0x290 kernel/exit.c:998 __do_sys_exit_group kernel/exit.c:1009 [inline] __se_sys_exit_group kernel/exit.c:1007 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:1007 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 ffff88810de3f000 which belongs to the cache vm_area_struct of size 192 The buggy address is located 112 bytes inside of 192-byte region [ffff88810de3f000, ffff88810de3f0c0) The buggy address belongs to the page: page:ffffea0004378fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10de3f memcg:ffff88811bf6b301 flags: 0x200000000000200(slab|node=0|zone=2) raw: 0200000000000200 0000000000000000 dead000000000122 ffff88810012fa00 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff88811bf6b301 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 2404, ts 49456104481, free_ts 49451643439 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 __split_vma+0x88/0x420 mm/mmap.c:2730 mprotect_fixup+0x595/0x820 mm/mprotect.c:483 do_mprotect_pkey+0x3c5/0x750 mm/mprotect.c:636 __do_sys_mprotect mm/mprotect.c:662 [inline] __se_sys_mprotect mm/mprotect.c:659 [inline] __x64_sys_mprotect+0x6f/0xb0 mm/mprotect.c:659 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 last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare+0x34e/0x730 mm/page_alloc.c:1391 free_unref_page_prepare mm/page_alloc.c:3317 [inline] free_unref_page_list+0x168/0x9a0 mm/page_alloc.c:3433 release_pages+0x9f2/0x1100 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:241 [inline] tlb_flush_mmu mm/mmu_gather.c:248 [inline] tlb_finish_mmu+0x125/0x6c0 mm/mmu_gather.c:371 exit_mmap+0x185/0x580 mm/mmap.c:3218 __mmput kernel/fork.c:1128 [inline] mmput+0x90/0x390 kernel/fork.c:1149 exit_mm kernel/exit.c:551 [inline] do_exit+0x90a/0x2270 kernel/exit.c:871 do_group_exit+0xe7/0x290 kernel/exit.c:998 __do_sys_exit_group kernel/exit.c:1009 [inline] __se_sys_exit_group kernel/exit.c:1007 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:1007 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 Memory state around the buggy address: ffff88810de3ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810de3ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810de3f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810de3f080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88810de3f100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================