================================================================== BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:381 [inline] BUG: KASAN: slab-use-after-free in gfs2_discard fs/gfs2/aops.c:589 [inline] BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:627 Read of size 8 at addr ffff88804008b248 by task kworker/0:0H/11 CPU: 0 UID: 0 PID: 11 Comm: kworker/0:0H Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: gfs2-glock/syz:syz glock_work_func Call Trace: dump_stack_lvl+0xe8/0x150 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 list_empty include/linux/list.h:381 [inline] gfs2_discard fs/gfs2/aops.c:589 [inline] gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:627 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d8/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xd90 mm/truncate.c:404 inode_go_inval+0x21f/0x360 fs/gfs2/glops.c:382 do_xmote+0x29c/0x750 fs/gfs2/glock.c:695 glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1010 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 5341: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:214 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:251 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline] iomap_file_buffered_write+0x5b2/0x9c0 fs/iomap/buffered-io.c:1188 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 1048: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6781 trans_drain fs/gfs2/log.c:1015 [inline] gfs2_log_flush+0x17a2/0x24c0 fs/gfs2/log.c:1153 gfs2_write_inode+0x23f/0x3e0 fs/gfs2/super.c:447 write_inode fs/fs-writeback.c:1582 [inline] __writeback_single_inode+0x7e1/0x1240 fs/fs-writeback.c:1802 writeback_sb_inodes+0x93a/0x1870 fs/fs-writeback.c:2030 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2107 wb_writeback+0x43f/0xaa0 fs/fs-writeback.c:2218 wb_check_start_all fs/fs-writeback.c:2344 [inline] wb_do_writeback fs/fs-writeback.c:2370 [inline] wb_workfn+0x8ee/0xed0 fs/fs-writeback.c:2403 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 The buggy address belongs to the object at ffff88804008b230 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff88804008b230, ffff88804008b280) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4008b flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff8880007d2c80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000240024 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5341, tgid 5340 (syz.0.0), ts 76589516617, free_ts 76508329946 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0x24e0/0x2580 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xe53/0x1820 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5270 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_meta+0x2cf/0x960 fs/gfs2/trans.c:276 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline] gfs2_alloc_blocks+0x7a0/0x2080 fs/gfs2/rgrp.c:2447 alloc_dinode+0x258/0x550 fs/gfs2/inode.c:436 gfs2_create_inode+0xbc8/0x15b0 fs/gfs2/inode.c:822 gfs2_atomic_open+0x116/0x200 fs/gfs2/inode.c:1402 atomic_open fs/namei.c:4295 [inline] lookup_open fs/namei.c:4406 [inline] open_last_lookups fs/namei.c:4540 [inline] path_openat+0x11f8/0x3dd0 fs/namei.c:4784 do_filp_open+0x1fa/0x410 fs/namei.c:4814 do_sys_openat2+0x121/0x200 fs/open.c:1430 page last free pid 5339 tgid 5339 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xc8e/0x1720 kernel/rcu/tree.c:2857 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 Memory state around the buggy address: ffff88804008b100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ffff88804008b180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb >ffff88804008b200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ^ ffff88804008b280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc ffff88804008b300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================