RAX: ffffffffffffffda RBX: 00007f421cf76080 RCX: 00007f421cd85d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007f421dc77090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f421cf76080 R15: 00007ffc72efe938 ================================================================== BUG: KASAN: slab-out-of-bounds in instrument_write include/linux/instrumented.h:40 [inline] BUG: KASAN: slab-out-of-bounds in ___clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:44 [inline] BUG: KASAN: slab-out-of-bounds in __clear_open_fd fs/file.c:324 [inline] BUG: KASAN: slab-out-of-bounds in __put_unused_fd+0xdb/0x2a0 fs/file.c:600 Write of size 8 at addr ffff88807c937c78 by task syz.1.575/8639 CPU: 0 UID: 0 PID: 8639 Comm: syz.1.575 Not tainted 6.13.0-rc3-next-20241220-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_write include/linux/instrumented.h:40 [inline] ___clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:44 [inline] __clear_open_fd fs/file.c:324 [inline] __put_unused_fd+0xdb/0x2a0 fs/file.c:600 put_unused_fd+0x5c/0x70 fs/file.c:609 __do_sys_fanotify_init fs/notify/fanotify/fanotify_user.c:1628 [inline] __se_sys_fanotify_init+0x800/0x970 fs/notify/fanotify/fanotify_user.c:1466 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f421cd85d29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f421dc77038 EFLAGS: 00000246 ORIG_RAX: 000000000000012c RAX: ffffffffffffffda RBX: 00007f421cf76080 RCX: 00007f421cd85d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007f421dc77090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f421cf76080 R15: 00007ffc72efe938 Allocated by task 8618: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_lru_noprof+0x1dd/0x390 mm/slub.c:4183 shmem_alloc_inode+0x28/0x40 mm/shmem.c:5036 alloc_inode+0x65/0x1a0 fs/inode.c:336 new_inode_pseudo fs/inode.c:1174 [inline] new_inode+0x22/0x1d0 fs/inode.c:1193 __shmem_get_inode mm/shmem.c:2934 [inline] shmem_get_inode+0x39d/0xf20 mm/shmem.c:3008 shmem_symlink+0x129/0x6b0 mm/shmem.c:3983 vfs_symlink+0x137/0x2e0 fs/namei.c:4669 do_symlinkat+0x222/0x3a0 fs/namei.c:4695 __do_sys_symlinkat fs/namei.c:4711 [inline] __se_sys_symlinkat fs/namei.c:4708 [inline] __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807c937590 which belongs to the cache shmem_inode_cache of size 1544 The buggy address is located 224 bytes to the right of allocated 1544-byte region [ffff88807c937590, ffff88807c937b98) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807c9361f8 pfn:0x7c930 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802efa9101 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff888140aaf280 ffffea0001f4d210 ffffea0001c68010 raw: ffff88807c9361f8 000000000013000f 00000000f5000000 ffff88802efa9101 head: 00fff00000000240 ffff888140aaf280 ffffea0001f4d210 ffffea0001c68010 head: ffff88807c9361f8 000000000013000f 00000000f5000000 ffff88802efa9101 head: 00fff00000000003 ffffea0001f24c01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5836, tgid 5836 (syz-executor), ts 78311711727, free_ts 78302897301 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4754 alloc_pages_mpol+0x30e/0x550 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4183 shmem_alloc_inode+0x28/0x40 mm/shmem.c:5036 alloc_inode+0x65/0x1a0 fs/inode.c:336 new_inode_pseudo fs/inode.c:1174 [inline] new_inode+0x22/0x1d0 fs/inode.c:1193 __shmem_get_inode mm/shmem.c:2934 [inline] shmem_get_inode+0x39d/0xf20 mm/shmem.c:3008 shmem_mknod+0x191/0x3d0 mm/shmem.c:3730 shmem_mkdir+0x33/0x70 mm/shmem.c:3796 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311 do_mkdirat+0x264/0x3a0 fs/namei.c:4334 page last free pid 5837 tgid 5837 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 discard_slab mm/slub.c:2684 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3153 put_cpu_partial+0x17c/0x250 mm/slub.c:3228 __slab_free+0x290/0x380 mm/slub.c:4479 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] __kmalloc_cache_noprof+0x1d9/0x390 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] nsim_fib6_rt_create drivers/net/netdevsim/fib.c:547 [inline] nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:752 [inline] nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline] nsim_fib_event_work+0x19c5/0x4130 drivers/net/netdevsim/fib.c:1493 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88807c937b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807c937b80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807c937c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807c937c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807c937d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================