================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3157 [inline] BUG: KASAN: double-free or invalid-free in kfree+0xdb/0x3c0 mm/slub.c:4194 CPU: 0 PID: 8531 Comm: syz-executor.1 Not tainted 5.10.0-rc7-next-20201210-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/0x2f8 mm/kasan/report.c:230 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:355 ____kasan_slab_free.part.0+0xfd/0x110 mm/kasan/common.c:345 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1548 [inline] slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1586 slab_free mm/slub.c:3157 [inline] kfree+0xdb/0x3c0 mm/slub.c:4194 bdev_free_inode+0x57/0x80 fs/block_dev.c:788 i_callback+0x3f/0x70 fs/inode.c:222 rcu_do_batch kernel/rcu/tree.c:2502 [inline] rcu_core+0x735/0x1020 kernel/rcu/tree.c:2737 __do_softirq+0x2b7/0xa76 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:424 [inline] irq_exit_rcu+0x194/0x210 kernel/softirq.c:436 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:__sanitizer_cov_trace_const_cmp1+0x0/0x80 kernel/kcov.c:269 Code: 39 fe 72 1f 48 83 c2 01 4c 89 44 38 e8 48 c7 44 38 e0 06 00 00 00 48 89 4c 38 f0 4e 89 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 <53> 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 00 f0 01 00 48 RSP: 0018:ffffc900016bf8e0 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 000000000000000f RCX: 0000000000000000 RDX: ffff88801151d100 RSI: 000000000000000f RDI: 0000000000000010 RBP: ffff8880241f5900 R08: 0000000000000000 R09: 000000000000000e R10: ffffffff83898c37 R11: 0000000000000010 R12: 0000000000000062 R13: 0000000000000365 R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x34a/0x5a0 security/tomoyo/util.c:1092 tomoyo_supervisor+0x312/0xf20 security/tomoyo/common.c:2089 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x2ec/0x3f0 security/tomoyo/file.c:838 tomoyo_path_unlink+0x8e/0xd0 security/tomoyo/tomoyo.c:150 security_path_unlink+0xd7/0x150 security/security.c:1102 do_unlinkat+0x375/0x660 fs/namei.c:3894 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dea7 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff57f78518 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dea7 RDX: 00007fff57f78530 RSI: 00007fff57f78530 RDI: 00007fff57f785c0 RBP: 000000000000011f R08: 0000000000000000 R09: 0000000000000010 R10: 000000000000000a R11: 0000000000000246 R12: 00007fff57f79650 R13: 0000000002a72a60 R14: 0000000000000000 R15: 0000000000069fa4 Allocated by task 4907: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:39 kasan_set_track mm/kasan/common.c:47 [inline] set_alloc_info mm/kasan/common.c:405 [inline] ____kasan_kmalloc mm/kasan/common.c:436 [inline] ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:408 kmalloc include/linux/slab.h:565 [inline] kernfs_get_open_node fs/kernfs/file.c:571 [inline] kernfs_fop_open+0x884/0xdf0 fs/kernfs/file.c:717 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x1bdc/0x27a0 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 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 4907: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:39 kasan_set_track+0x1c/0x30 mm/kasan/common.c:47 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:355 ____kasan_slab_free.part.0+0xe1/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1548 [inline] slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1586 slab_free mm/slub.c:3157 [inline] kfree+0xdb/0x3c0 mm/slub.c:4194 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+0x1f0/0x200 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 ffff888026758e00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff888026758e00, ffff888026758e80) The buggy address belongs to the page: page:00000000a01235b1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26758 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea000061bac0 0000000700000007 ffff888010841640 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888026758d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026758d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888026758e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026758e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888026758f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================