attempt to access beyond end of device loop2: rw=0, want=6491538, limit=128 Buffer I/O error on dev loop2, logical block 3245768, async page read ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5738 at fs/inode.c:389 inc_nlink+0x130/0x168 fs/inode.c:389 Modules linked in: CPU: 1 PID: 5738 Comm: syz.2.307 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : inc_nlink+0x130/0x168 fs/inode.c:389 lr : inc_nlink+0x130/0x168 fs/inode.c:389 sp : ffff80001f7e7b90 x29: ffff80001f7e7b90 x28: dfff800000000000 x27: 0000000000000000 x26: 1fffe0001bbbe00c x25: ffff80001155ce08 x24: 0000000000000000 x23: 1fffe0001bbbe010 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000dddf0038 x19: ffff0000dddf0080 x18: 0000000000000000 x17: 0000000000000002 x16: ffff80001119ef40 x15: 0000000000000003 x14: 00000000ffff8000 x13: 00000000cda9336b x12: 0000000000080000 x11: 0000000000003ba7 x10: ffff80002216a000 x9 : ffff80000894f338 x8 : 0000000000003ba8 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000000 x2 : ffff0000ddde6bc0 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: inc_nlink+0x130/0x168 fs/inode.c:389 inode_inc_link_count include/linux/fs.h:2497 [inline] sysv_mkdir+0x2c/0x138 fs/sysv/namei.c:119 vfs_mkdir+0x314/0x4d4 fs/namei.c:4065 do_mkdirat+0x1bc/0x508 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 222026 hardirqs last enabled at (222025): [] kasan_quarantine_put+0xc4/0x204 mm/kasan/quarantine.c:231 hardirqs last disabled at (222026): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (221950): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (221948): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace cbea43de4c527919 ]--- ================================================================== BUG: KASAN: use-after-free in sysv_new_inode+0xd54/0xec8 fs/sysv/ialloc.c:153 Read of size 2 at addr ffff0000ddc001ce by task syz.2.307/5738 CPU: 0 PID: 5738 Comm: syz.2.307 Tainted: G W 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307 sysv_new_inode+0xd54/0xec8 fs/sysv/ialloc.c:153 sysv_mkdir+0x44/0x138 fs/sysv/namei.c:121 vfs_mkdir+0x314/0x4d4 fs/namei.c:4065 do_mkdirat+0x1bc/0x508 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 4545: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x408 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1e0/0x3e4 mm/slub.c:3233 sock_alloc_inode+0x24/0xc4 net/socket.c:303 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x68/0x1fc fs/inode.c:1001 sock_alloc net/socket.c:626 [inline] __sock_create+0x140/0x8b4 net/socket.c:1450 sock_create net/socket.c:1542 [inline] __sys_socket+0xf0/0x18c net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1591 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 20: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 sock_free_inode+0x28/0x38 net/socket.c:324 i_callback+0x50/0x78 fs/inode.c:250 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0x7c8/0x1764 kernel/rcu/tree.c:2763 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776 handle_softirqs+0x344/0xbf0 kernel/softirq.c:558 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:925 smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x110/0x8f0 kernel/rcu/tree.c:3087 destroy_inode fs/inode.c:316 [inline] evict+0x748/0x810 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x320/0x598 fs/dcache.c:586 dentry_kill+0xc8/0x248 fs/dcache.c:-1 dput+0x23c/0x458 fs/dcache.c:893 __fput+0x494/0x7f8 fs/file_table.c:319 ____fput+0x20/0x30 fs/file_table.c:339 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Second to last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x110/0x8f0 kernel/rcu/tree.c:3087 destroy_inode fs/inode.c:316 [inline] evict+0x748/0x810 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 __sock_release net/socket.c:661 [inline] sock_release+0x110/0x140 net/socket.c:677 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] sctp_ctrlsock_exit+0x64/0x7c net/sctp/protocol.c:1465 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x5c4/0xa14 net/core/net_namespace.c:618 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 The buggy address belongs to the object at ffff0000ddc00000 which belongs to the cache sock_inode_cache of size 1408 The buggy address is located 462 bytes inside of 1408-byte region [ffff0000ddc00000, ffff0000ddc00580) The buggy address belongs to the page: page:000000004c67030c refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000ddc06c00 pfn:0x11dc00 head:000000004c67030c order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d18a6001 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003a20c00 0000000200000002 ffff0000c085a480 raw: ffff0000ddc06c00 0000000080150013 00000001ffffffff ffff0000d18a6001 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ddc00080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ddc00100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000ddc00180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ddc00200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ddc00280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== unable to read i-node block sysv_new_block: new block 512 is not in data zone unable to read i-node block sysv_free_inode: unable to read inode block on device loop2