================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] BUG: KASAN: slab-use-after-free in __fscache_relinquish_cookie+0x2a/0x650 fs/netfs/fscache_cookie.c:977 Write of size 8 at addr ffff888054f900f0 by task syz-executor.1/27117 CPU: 1 PID: 27117 Comm: syz-executor.1 Not tainted 6.9.0-rc1-syzkaller-00009-g7033999ecd7b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] __fscache_relinquish_cookie+0x2a/0x650 fs/netfs/fscache_cookie.c:977 fscache_relinquish_cookie include/linux/fscache.h:308 [inline] v9fs_evict_inode+0x102/0x150 fs/9p/vfs_inode.c:356 evict+0x2ed/0x6c0 fs/inode.c:667 iput_final fs/inode.c:1741 [inline] iput.part.0+0x5a8/0x7f0 fs/inode.c:1767 iput+0x5c/0x80 fs/inode.c:1757 v9fs_fid_iget_dotl+0x1b4/0x260 fs/9p/vfs_inode_dotl.c:96 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] v9fs_mount+0x515/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 RIP: 0023:0xf7351579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5f4b5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000200003c0 RDX: 0000000020000b80 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 19662: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3852 kmem_cache_zalloc include/linux/slab.h:739 [inline] fscache_alloc_cookie fs/netfs/fscache_cookie.c:335 [inline] __fscache_acquire_cookie+0xb6/0x13c0 fs/netfs/fscache_cookie.c:470 fscache_acquire_cookie include/linux/fscache.h:253 [inline] v9fs_cache_inode_get_cookie+0x21d/0x3a0 fs/9p/cache.c:66 v9fs_fid_iget+0x32e/0x3c0 fs/9p/vfs_inode.c:395 v9fs_get_inode_from_fid fs/9p/v9fs.h:232 [inline] v9fs_vfs_lookup+0x3dc/0x550 fs/9p/vfs_inode.c:679 __lookup_slow+0x24f/0x460 fs/namei.c:1692 lookup_slow fs/namei.c:1709 [inline] walk_component+0x350/0x5b0 fs/namei.c:2004 link_path_walk.part.0.constprop.0+0x77f/0xcd0 fs/namei.c:2331 link_path_walk fs/namei.c:2255 [inline] path_lookupat+0x93/0x770 fs/namei.c:2484 filename_lookup+0x4a6/0x5b0 fs/namei.c:2516 user_path_at_empty+0x42/0x60 fs/namei.c:2921 user_path_at include/linux/namei.h:57 [inline] __do_sys_pivot_root+0x1ff/0x1660 fs/namespace.c:4195 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 Freed by task 15296: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x12e/0x380 mm/slub.c:4344 fscache_free_cookie+0x26a/0x510 fs/netfs/fscache_cookie.c:79 fscache_put_cookie+0xf5/0x150 fs/netfs/fscache_cookie.c:1014 __fscache_relinquish_cookie+0x260/0x650 fs/netfs/fscache_cookie.c:996 fscache_relinquish_cookie include/linux/fscache.h:308 [inline] v9fs_evict_inode+0x102/0x150 fs/9p/vfs_inode.c:356 evict+0x2ed/0x6c0 fs/inode.c:667 dispose_list+0x117/0x1e0 fs/inode.c:700 evict_inodes+0x34e/0x450 fs/inode.c:750 generic_shutdown_super+0xb5/0x3d0 fs/super.c:626 kill_anon_super+0x3a/0x60 fs/super.c:1225 v9fs_kill_super+0x3d/0xa0 fs/9p/vfs_super.c:193 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x275/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x8a/0x120 arch/x86/entry/common.c:324 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 The buggy address belongs to the object at ffff888054f90000 which belongs to the cache fscache_cookie_jar of size 280 The buggy address is located 240 bytes inside of freed 280-byte region [ffff888054f90000, ffff888054f90118) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54f90 head: order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff80000000840(slab|head|node=1|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 04fff80000000840 ffff88801630d7c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080170017 00000001ffffffff 0000000000000000 head: 04fff80000000840 ffff88801630d7c0 dead000000000122 0000000000000000 head: 0000000000000000 0000000080170017 00000001ffffffff 0000000000000000 head: 04fff80000000001 ffffea000153e401 dead000000000122 00000000ffffffff head: 0000000200000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 19662, tgid 19640 (syz-executor.2), ts 307201143230, free_ts 307056958528 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x670/0x16d0 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x2e9/0x320 mm/slub.c:3852 kmem_cache_zalloc include/linux/slab.h:739 [inline] fscache_alloc_cookie fs/netfs/fscache_cookie.c:335 [inline] __fscache_acquire_cookie+0xb6/0x13c0 fs/netfs/fscache_cookie.c:470 fscache_acquire_cookie include/linux/fscache.h:253 [inline] v9fs_cache_inode_get_cookie+0x21d/0x3a0 fs/9p/cache.c:66 v9fs_fid_iget+0x32e/0x3c0 fs/9p/vfs_inode.c:395 v9fs_get_inode_from_fid fs/9p/v9fs.h:232 [inline] v9fs_vfs_lookup+0x3dc/0x550 fs/9p/vfs_inode.c:679 __lookup_slow+0x24f/0x460 fs/namei.c:1692 lookup_slow fs/namei.c:1709 [inline] walk_component+0x350/0x5b0 fs/namei.c:2004 link_path_walk.part.0.constprop.0+0x77f/0xcd0 fs/namei.c:2331 link_path_walk fs/namei.c:2255 [inline] path_lookupat+0x93/0x770 fs/namei.c:2484 filename_lookup+0x4a6/0x5b0 fs/namei.c:2516 page last free pid 18178 tgid 18178 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3852 kmem_cache_zalloc include/linux/slab.h:739 [inline] jbd2_alloc_handle include/linux/jbd2.h:1591 [inline] new_handle fs/jbd2/transaction.c:476 [inline] jbd2__journal_start+0x1dc/0x730 fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x358/0x660 fs/ext4/ext4_jbd2.c:112 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] __ext4_unlink+0x418/0xcb0 fs/ext4/namei.c:3262 ext4_unlink+0x422/0x610 fs/ext4/namei.c:3321 vfs_unlink+0x2fb/0x910 fs/namei.c:4338 do_unlinkat+0x5c0/0x750 fs/namei.c:4402 __do_sys_unlink fs/namei.c:4450 [inline] __se_sys_unlink fs/namei.c:4448 [inline] __ia32_sys_unlink+0xc6/0x110 fs/namei.c:4448 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 Memory state around the buggy address: ffff888054f8ff80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff888054f90000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888054f90080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888054f90100: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888054f90180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi