bcachefs (loop5): set_node_max(): u64s 11 type btree_ptr_v2 0:82:0 len 0 ver 0: seq 4dc858ad08044b41 written 16 min_key POS_MIN durability: 1 ptr: 0:141:0 gen 0 -> SPOS_MAX done bcachefs (loop5): accounting_read... done bcachefs (loop5): alloc_read... done bcachefs (loop5): snapshots_read... done bcachefs (loop5): check_allocations... ================================================================== BUG: KASAN: slab-use-after-free in __journal_key_cmp fs/bcachefs/btree_journal_iter.h:63 [inline] BUG: KASAN: slab-use-after-free in __bch2_journal_key_search+0x57b/0x12e0 fs/bcachefs/btree_journal_iter.c:54 Read of size 4 at addr ffff888020ad3694 by task syz.5.275/8219 CPU: 0 UID: 0 PID: 8219 Comm: syz.5.275 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __journal_key_cmp fs/bcachefs/btree_journal_iter.h:63 [inline] __bch2_journal_key_search+0x57b/0x12e0 fs/bcachefs/btree_journal_iter.c:54 bch2_journal_key_search fs/bcachefs/btree_journal_iter.c:73 [inline] bch2_journal_iter_init fs/bcachefs/btree_journal_iter.c:540 [inline] __bch2_btree_and_journal_iter_init_node_iter+0x3ad/0x9f0 fs/bcachefs/btree_journal_iter.c:659 btree_node_iter_and_journal_peek+0x210/0x10a0 fs/bcachefs/btree_iter.c:899 btree_path_down fs/bcachefs/btree_iter.c:956 [inline] bch2_btree_path_traverse_one+0x148d/0x21d0 fs/bcachefs/btree_iter.c:1199 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:252 [inline] __bch2_btree_iter_peek fs/bcachefs/btree_iter.c:2266 [inline] bch2_btree_iter_peek_max+0xa56/0x6580 fs/bcachefs/btree_iter.c:2385 bch2_btree_iter_peek_max_type fs/bcachefs/btree_iter.h:769 [inline] bch2_gc_btree fs/bcachefs/btree_gc.c:736 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:800 [inline] bch2_check_allocations+0x149b/0x5870 fs/bcachefs/btree_gc.c:1099 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:487 [inline] __bch2_run_recovery_passes+0x3b7/0x1090 fs/bcachefs/recovery_passes.c:543 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:614 bch2_fs_recovery+0x1af4/0x2c20 fs/bcachefs/recovery.c:813 bch2_fs_start+0x97f/0xd10 fs/bcachefs/super.c:1405 bch2_fs_get_tree+0xb35/0x1540 fs/bcachefs/fs.c:2446 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbe4319038a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbe43ffde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbe43ffdef0 RCX: 00007fbe4319038a RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007fbe43ffdeb0 RBP: 0000200000000080 R08: 00007fbe43ffdef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007fbe43ffdeb0 R14: 0000000000024c71 R15: 0000200000000040 Allocated by task 8219: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x21c/0x3a0 mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:909 [inline] bch2_journal_key_insert fs/bcachefs/btree_journal_iter.c:360 [inline] bch2_journal_key_delete+0xff/0x230 fs/bcachefs/btree_journal_iter.c:379 bch2_btree_repair_topology_recurse+0xeb2/0x5070 fs/bcachefs/btree_gc.c:379 bch2_check_topology+0x1059/0x19f0 fs/bcachefs/btree_gc.c:614 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:487 [inline] __bch2_run_recovery_passes+0x3b7/0x1090 fs/bcachefs/recovery_passes.c:543 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:614 bch2_fs_recovery+0x1af4/0x2c20 fs/bcachefs/recovery.c:813 bch2_fs_start+0x97f/0xd10 fs/bcachefs/super.c:1405 bch2_fs_get_tree+0xb35/0x1540 fs/bcachefs/fs.c:2446 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 8219: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x18e/0x440 mm/slub.c:4879 bch2_journal_key_insert_take+0x160e/0x1af0 fs/bcachefs/btree_journal_iter.c:300 set_node_max+0x3f7/0x680 fs/bcachefs/btree_gc.c:172 btree_repair_node_end fs/bcachefs/btree_gc.c:329 [inline] bch2_btree_repair_topology_recurse+0x3942/0x5070 fs/bcachefs/btree_gc.c:447 bch2_check_topology+0x1059/0x19f0 fs/bcachefs/btree_gc.c:614 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:487 [inline] __bch2_run_recovery_passes+0x3b7/0x1090 fs/bcachefs/recovery_passes.c:543 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:614 bch2_fs_recovery+0x1af4/0x2c20 fs/bcachefs/recovery.c:813 bch2_fs_start+0x97f/0xd10 fs/bcachefs/super.c:1405 bch2_fs_get_tree+0xb35/0x1540 fs/bcachefs/fs.c:2446 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888020ad3680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 20 bytes inside of freed 64-byte region [ffff888020ad3680, ffff888020ad36c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888020ad3500 pfn:0x20ad3 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801a8418c0 ffffea0001628b90 ffffea0001622410 raw: ffff888020ad3500 000000000020001f 00000000f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 3181363425, free_ts 3021738106 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x330 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbd1/0x13e0 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_noprof+0x2f1/0x4b0 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:913 [inline] acpi_ut_initialize_buffer+0x150/0x240 drivers/acpi/acpica/utalloc.c:-1 acpi_rs_create_resource_list+0x107/0x1d0 drivers/acpi/acpica/rscreate.c:137 acpi_rs_get_method_data+0xb9/0x110 drivers/acpi/acpica/rsutils.c:662 acpi_walk_resources+0x14b/0x4e0 drivers/acpi/acpica/rsxface.c:616 acpi_mipi_check_crs_csi2+0xe4/0x520 drivers/acpi/mipi-disco-img.c:181 acpi_bus_check_add+0x284/0x820 drivers/acpi/scan.c:2130 acpi_ns_walk_namespace+0x268/0x690 drivers/acpi/acpica/nswalk.c:-1 acpi_walk_namespace+0xe8/0x130 drivers/acpi/acpica/nsxfeval.c:606 acpi_bus_scan+0xe8/0x4b0 drivers/acpi/scan.c:2587 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 __slab_free+0x2e7/0x390 mm/slub.c:4591 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_remove_cache+0xd9/0x190 mm/kasan/quarantine.c:364 kmem_cache_shrink+0xd/0x20 mm/slab_common.c:558 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1605 acpi_purge_cached_objects+0x8f/0xd0 drivers/acpi/acpica/utxface.c:239 acpi_initialize_objects+0x10/0x70 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init+0xb4/0x550 drivers/acpi/bus.c:1367 acpi_init+0xa1/0x1f0 drivers/acpi/bus.c:1456 do_one_initcall+0x233/0x820 init/main.c:1281 do_initcall_level+0x104/0x190 init/main.c:1343 do_initcalls+0x59/0xa0 init/main.c:1359 kernel_init_freeable+0x334/0x4b0 init/main.c:1591 kernel_init+0x1d/0x1d0 init/main.c:1481 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148 Memory state around the buggy address: ffff888020ad3580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888020ad3600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888020ad3680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888020ad3700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888020ad3780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================