================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3c2f/0x5470 kernel/locking/lockdep.c:4897 Read of size 8 at addr ffff88802a8e9640 by task syz-executor.3/31745 CPU: 0 PID: 31745 Comm: syz-executor.3 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __lock_acquire+0x3c2f/0x5470 kernel/locking/lockdep.c:4897 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 remove_wait_queue+0x1d/0x180 kernel/sched/wait.c:55 ep_remove_wait_queue+0x88/0x1a0 fs/eventpoll.c:545 ep_unregister_pollwait fs/eventpoll.c:561 [inline] ep_remove+0x106/0x9c0 fs/eventpoll.c:690 eventpoll_release_file+0xe1/0x130 fs/eventpoll.c:923 eventpoll_release include/linux/eventpoll.h:53 [inline] __fput+0x87b/0x9f0 fs/file_table.c:271 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f42c5ff9c2b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd794fdab0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f42c5ff9c2b RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007f42c615b960 R08: 0000000000000000 R09: 00007f42c615ea88 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000000f7fd6 R13: 00007f42c615eea0 R14: 00007f42c6159f60 R15: 0000000000000000 Allocated by task 31748: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:582 [inline] psi_trigger_create.part.0+0x15e/0x7f0 kernel/sched/psi.c:1141 cgroup_pressure_write+0x17e/0x6e0 kernel/cgroup/cgroup.c:3647 cgroup_file_write+0x1de/0x760 kernel/cgroup/cgroup.c:3877 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 31751: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x130/0x160 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xcb/0x280 mm/slub.c:4562 cgroup_pressure_write+0x1b3/0x6e0 kernel/cgroup/cgroup.c:3653 cgroup_file_write+0x1de/0x760 kernel/cgroup/cgroup.c:3877 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802a8e9600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 64 bytes inside of 192-byte region [ffff88802a8e9600, ffff88802a8e96c0) The buggy address belongs to the page: page:ffffea0000aa3a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a8e9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000987a40 dead000000000007 ffff888010c41a00 raw: 0000000000000000 0000000080100010 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 31254, ts 991993803929, free_ts 991920884723 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2190 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28a/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87c/0xe90 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x2fb/0x340 mm/slub.c:4420 kmalloc_array include/linux/slab.h:622 [inline] kcalloc include/linux/slab.h:653 [inline] ext4_find_extent+0xa38/0xd10 fs/ext4/extents.c:905 ext4_ext_map_blocks+0x1e2/0x5f40 fs/ext4/extents.c:4101 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637 ext4_alloc_file_blocks.isra.0+0x2c1/0xae0 fs/ext4/extents.c:4472 ext4_fallocate+0x488/0x41d0 fs/ext4/extents.c:4753 vfs_fallocate+0x48d/0xe10 fs/open.c:307 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:294 file_ioctl fs/ioctl.c:334 [inline] do_vfs_ioctl+0x1144/0x15d0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:860 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 __unfreeze_partials+0x320/0x340 mm/slub.c:2536 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5e/0xf0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:738 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:706 [inline] journal_alloc_journal_head fs/jbd2/journal.c:2858 [inline] jbd2_journal_add_journal_head+0x1cb/0x5c0 fs/jbd2/journal.c:2927 jbd2_journal_get_create_access+0x40/0x560 fs/jbd2/transaction.c:1262 __ext4_journal_get_create_access+0x50/0x1f0 fs/ext4/ext4_jbd2.c:322 ext4_ext_grow_indepth fs/ext4/extents.c:1331 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1427 [inline] ext4_ext_insert_extent+0x12ab/0x4160 fs/ext4/extents.c:2097 ext4_ext_map_blocks+0x121c/0x5f40 fs/ext4/extents.c:4306 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637 ext4_alloc_file_blocks.isra.0+0x2c1/0xae0 fs/ext4/extents.c:4472 ext4_fallocate+0x488/0x41d0 fs/ext4/extents.c:4753 vfs_fallocate+0x48d/0xe10 fs/open.c:307 Memory state around the buggy address: ffff88802a8e9500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802a8e9580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88802a8e9600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802a8e9680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802a8e9700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================