================================================================== BUG: KASAN: double-free or invalid-free in bdev_free_inode+0x57/0x80 fs/block_dev.c:787 CPU: 1 PID: 4892 Comm: systemd-udevd Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2c6 mm/kasan/report.c:230 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:355 ____kasan_slab_free+0xcc/0xe0 mm/kasan/common.c:341 kasan_slab_free include/linux/kasan.h:188 [inline] __cache_free mm/slab.c:3424 [inline] kfree+0xed/0x270 mm/slab.c:3760 bdev_free_inode+0x57/0x80 fs/block_dev.c:787 i_callback+0x3f/0x70 fs/inode.c:222 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723 __do_softirq+0x2a5/0x9f7 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:fsnotify+0xb/0x1070 fs/notify/fsnotify.c:464 Code: fe ff ff 48 89 df e8 64 94 e2 ff e9 45 fe ff ff e8 5a 94 e2 ff e9 a2 fe ff ff 0f 1f 44 00 00 41 57 41 89 d7 41 56 41 55 41 54 <55> 48 bd 00 00 00 00 00 fc ff df 53 4c 89 cb 48 81 ec f0 00 00 00 RSP: 0018:ffffc90001397da8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff888012932550 RDI: 0000000040020000 RBP: ffff8880347baa88 R08: 0000000000000000 R09: ffff888039300640 R10: ffffffff8381b7fd R11: 0000000000004000 R12: ffff888039300640 R13: ffff888012932540 R14: ffff888012932550 R15: 0000000000000001 fsnotify_parent include/linux/fsnotify.h:71 [inline] fsnotify_file include/linux/fsnotify.h:90 [inline] fsnotify_perm include/linux/fsnotify.h:115 [inline] fsnotify_perm include/linux/fsnotify.h:94 [inline] security_file_permission+0x304/0x560 security/security.c:1452 iterate_dir+0x9e/0x660 fs/readdir.c:50 __do_sys_getdents fs/readdir.c:283 [inline] __se_sys_getdents fs/readdir.c:268 [inline] __x64_sys_getdents+0x13a/0x2b0 fs/readdir.c:268 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f6000083f2b Code: fc ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 41 56 48 63 ff 41 55 41 54 b8 4e 00 00 00 55 53 48 89 f3 48 83 ec 08 0f 05 <48> 3d 00 f0 ff ff 77 55 48 8d 2c 06 49 89 c4 48 39 ee 73 34 90 44 RSP: 002b:00007fffcc1e5370 EFLAGS: 00000202 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 000056511f5464c0 RCX: 00007f6000083f2b RDX: 0000000000008000 RSI: 000056511f5464c0 RDI: 000000000000000f RBP: 000056511f5464c0 R08: 00007f600036a318 R09: 0000000000008040 R10: 0000000000000020 R11: 0000000000000202 R12: fffffffffffffe50 R13: 0000000000000000 R14: 00000000000000ff R15: 000056511f50c410 Allocated by task 4892: 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:401 [inline] ____kasan_kmalloc.constprop.0+0x7f/0xa0 mm/kasan/common.c:429 kasan_kmalloc include/linux/kasan.h:215 [inline] kmem_cache_alloc_trace+0x1e0/0x400 mm/slab.c:3554 kmalloc include/linux/slab.h:552 [inline] kernfs_get_open_node fs/kernfs/file.c:571 [inline] kernfs_fop_open+0x957/0xd40 fs/kernfs/file.c:717 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3254 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3371 do_filp_open+0x17e/0x3c0 fs/namei.c:3398 do_sys_openat2+0x16d/0x420 fs/open.c:1172 do_sys_open fs/open.c:1188 [inline] __do_sys_open fs/open.c:1196 [inline] __se_sys_open fs/open.c:1192 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1192 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4892: 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:356 ____kasan_slab_free+0xb0/0xe0 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:188 [inline] __cache_free mm/slab.c:3424 [inline] kfree+0xed/0x270 mm/slab.c:3760 kernfs_fop_release+0xe3/0x190 fs/kernfs/file.c:779 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888031fa2400 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff888031fa2400, ffff888031fa2480) The buggy address belongs to the page: page:000000000a8a7bad refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888031fa2c00 pfn:0x31fa2 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea000044bf88 ffffea0000a89a48 ffff888010040400 raw: ffff888031fa2c00 ffff888031fa2000 000000010000000f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888031fa2300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888031fa2380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888031fa2400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888031fa2480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888031fa2500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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