loop6: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: use-after-free in dtCompare fs/jfs/jfs_dtree.c:3629 [inline] BUG: KASAN: use-after-free in dtSearch+0x12e4/0x1b28 fs/jfs/jfs_dtree.c:650 Read of size 1 at addr ffff0000de160118 by task syz.6.478/6056 CPU: 1 PID: 6056 Comm: syz.6.478 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306 dtCompare fs/jfs/jfs_dtree.c:3629 [inline] dtSearch+0x12e4/0x1b28 fs/jfs/jfs_dtree.c:650 jfs_lookup+0x13c/0x32c fs/jfs/namei.c:1459 __lookup_slow+0x24c/0x380 fs/namei.c:1663 lookup_slow+0x5c/0x80 fs/namei.c:1680 walk_component+0x2b0/0x3a8 fs/namei.c:1976 link_path_walk+0x590/0xb8c fs/namei.c:-1 path_openat+0x1c0/0x26e4 fs/namei.c:3738 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 5990: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x408 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1e0/0x3e4 mm/slub.c:3233 proc_alloc_inode+0x24/0xb0 fs/proc/inode.c:69 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x68/0x1fc fs/inode.c:1001 new_inode+0x38/0x174 fs/inode.c:1030 proc_pid_make_inode+0x30/0x1a0 fs/proc/base.c:1957 proc_ns_instantiate fs/proc/namespaces.c:105 [inline] proc_ns_dir_lookup+0x6b0/0x810 fs/proc/namespaces.c:172 lookup_open fs/namei.c:3440 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0xfbc/0x26e4 fs/namei.c:3739 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 4033: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 proc_free_inode+0x28/0x38 fs/proc/inode.c:85 i_callback+0x50/0x78 fs/inode.c:250 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0x7c8/0x1764 kernel/rcu/tree.c:2763 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776 handle_softirqs+0x344/0xbf0 kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:439 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:641 irq_exit+0x14/0x88 kernel/softirq.c:665 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x110/0x8f0 kernel/rcu/tree.c:3087 destroy_inode fs/inode.c:316 [inline] evict+0x748/0x810 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x320/0x598 fs/dcache.c:586 shrink_dentry_list+0x410/0x7c8 fs/dcache.c:1181 shrink_dcache_parent+0xb0/0x354 fs/dcache.c:-1 d_invalidate+0x10c/0x23c fs/dcache.c:1717 proc_invalidate_siblings_dcache+0x3c8/0x66c fs/proc/inode.c:150 proc_flush_pid+0x24/0x34 fs/proc/base.c:3431 release_task+0x14a4/0x16a0 kernel/exit.c:269 wait_task_zombie kernel/exit.c:1181 [inline] wait_consider_task+0x1508/0x27cc kernel/exit.c:1408 do_wait_thread kernel/exit.c:1471 [inline] do_wait+0x2f8/0xa98 kernel/exit.c:1588 kernel_wait4+0x1d0/0x318 kernel/exit.c:1751 __do_sys_wait4 kernel/exit.c:1779 [inline] __se_sys_wait4 kernel/exit.c:1775 [inline] __arm64_sys_wait4+0x120/0x2d0 kernel/exit.c:1775 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Second to last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x110/0x8f0 kernel/rcu/tree.c:3087 destroy_inode fs/inode.c:316 [inline] evict+0x748/0x810 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x320/0x598 fs/dcache.c:586 shrink_dentry_list+0x410/0x7c8 fs/dcache.c:1181 shrink_dcache_parent+0xb0/0x354 fs/dcache.c:-1 d_invalidate+0x10c/0x23c fs/dcache.c:1717 proc_invalidate_siblings_dcache+0x3c8/0x66c fs/proc/inode.c:150 proc_flush_pid+0x24/0x34 fs/proc/base.c:3431 release_task+0x14a4/0x16a0 kernel/exit.c:269 wait_task_zombie kernel/exit.c:1181 [inline] wait_consider_task+0x1508/0x27cc kernel/exit.c:1408 do_wait_thread kernel/exit.c:1471 [inline] do_wait+0x2f8/0xa98 kernel/exit.c:1588 kernel_wait4+0x1d0/0x318 kernel/exit.c:1751 __do_sys_wait4 kernel/exit.c:1779 [inline] __se_sys_wait4 kernel/exit.c:1775 [inline] __arm64_sys_wait4+0x120/0x2d0 kernel/exit.c:1775 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000de160000 which belongs to the cache proc_inode_cache of size 1240 The buggy address is located 280 bytes inside of 1240-byte region [ffff0000de160000, ffff0000de1604d8) The buggy address belongs to the page: page:000000006e60d14d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000de161560 pfn:0x11e160 head:000000006e60d14d order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d058ba01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc000373ca00 0000000400000004 ffff0000c0843200 raw: ffff0000de161560 0000000080170015 00000001ffffffff ffff0000d058ba01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000de160000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000de160080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000de160100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000de160180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000de160200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ERROR: (device loop6): dtSearch: stack overrun! ERROR: (device loop6): remounting filesystem as read-only btstack dump: bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 jfs_lookup: dtSearch returned -5