================================================================== BUG: KASAN: use-after-free in F2FS_SB fs/f2fs/f2fs.h:1884 [inline] BUG: KASAN: use-after-free in F2FS_I_SB fs/f2fs/f2fs.h:1889 [inline] BUG: KASAN: use-after-free in F2FS_M_SB fs/f2fs/f2fs.h:1894 [inline] BUG: KASAN: use-after-free in F2FS_P_SB fs/f2fs/f2fs.h:1899 [inline] BUG: KASAN: use-after-free in f2fs_release_page+0x2b1/0xa20 fs/f2fs/data.c:3800 Read of size 8 at addr ffff8881f05f63f0 by task syz-executor.5/29757 CPU: 1 PID: 29757 Comm: syz-executor.5 Not tainted 5.4.219-syzkaller-00012-ga8aad8851131 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x630 mm/kasan/report.c:384 __kasan_report+0xf6/0x130 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 F2FS_SB fs/f2fs/f2fs.h:1884 [inline] F2FS_I_SB fs/f2fs/f2fs.h:1889 [inline] F2FS_M_SB fs/f2fs/f2fs.h:1894 [inline] F2FS_P_SB fs/f2fs/f2fs.h:1899 [inline] f2fs_release_page+0x2b1/0xa20 fs/f2fs/data.c:3800 shrink_page_list+0x135c/0x3360 mm/vmscan.c:1447 shrink_inactive_list+0x51e/0xf60 mm/vmscan.c:1997 shrink_list mm/vmscan.c:2288 [inline] shrink_node_memcg+0x5c1/0x1080 mm/vmscan.c:2618 shrink_node+0x3be/0x1350 mm/vmscan.c:2831 shrink_zones+0x48d/0x960 mm/vmscan.c:3048 do_try_to_free_pages+0x21b/0x990 mm/vmscan.c:3106 try_to_free_mem_cgroup_pages+0x3e5/0x960 mm/vmscan.c:3407 try_charge+0x4fa/0x11f0 mm/memcontrol.c:2616 mem_cgroup_try_charge+0xd5/0x2a0 mm/memcontrol.c:6571 __add_to_page_cache_locked+0x246/0x970 mm/filemap.c:865 add_to_page_cache_lru+0x116/0x2b0 mm/filemap.c:962 pagecache_get_page+0x539/0x760 mm/filemap.c:1701 grab_cache_page_write_begin+0x50/0x90 mm/filemap.c:3261 ext4_da_write_begin+0x5ce/0xf80 fs/ext4/inode.c:3144 generic_perform_write+0x2f9/0x5a0 mm/filemap.c:3311 __generic_file_write_iter+0x239/0x490 mm/filemap.c:3440 ext4_file_write_iter+0x495/0x10e0 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1976 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5e3/0x780 fs/read_write.c:496 __kernel_write+0x12c/0x340 fs/read_write.c:515 dump_emit+0x223/0x360 fs/coredump.c:838 elf_core_dump+0x3f18/0x4870 fs/binfmt_elf.c:2352 do_coredump+0x1faf/0x2ed0 fs/coredump.c:801 get_signal+0xd5b/0x13f0 kernel/signal.c:2729 do_signal+0xb0/0x1200 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xdd/0x1d0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194 retint_user+0x8/0x8 Allocated by task 29644: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xbc/0x3c0 net/core/sock.c:1618 sk_alloc+0x30/0x390 net/core/sock.c:1676 __netlink_create net/netlink/af_netlink.c:636 [inline] netlink_create+0x3b7/0x620 net/netlink/af_netlink.c:699 __sock_create+0x393/0x730 net/socket.c:1408 sock_create net/socket.c:1459 [inline] __sys_socket+0x133/0x370 net/socket.c:1501 __do_sys_socket net/socket.c:1510 [inline] __se_sys_socket net/socket.c:1508 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1508 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 9: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x178/0x240 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kfree+0xc6/0x260 mm/slub.c:4071 sk_prot_free+0xa3/0x160 net/core/sock.c:1659 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch+0x49e/0xa10 kernel/rcu/tree.c:2167 rcu_core+0x4ba/0xca0 kernel/rcu/tree.c:2387 __do_softirq+0x23e/0x643 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881f05f6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1008 bytes inside of 2048-byte region [ffff8881f05f6000, ffff8881f05f6800) The buggy address belongs to the page: page:ffffea0007c17c00 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c0c000 raw: 0000000000000000 0000000000080008 00000001ffffffff 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 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x194/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x372/0x860 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3e0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x450 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x320/0x4a0 mm/slub.c:2667 __slab_alloc+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x197/0x2b0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_array_node include/linux/slab.h:653 [inline] kcalloc_node include/linux/slab.h:658 [inline] blk_mq_alloc_rq_map+0xb3/0x1a0 block/blk-mq.c:2155 blk_mq_sched_alloc_tags block/blk-mq-sched.c:508 [inline] blk_mq_init_sched+0x1f2/0xaf0 block/blk-mq-sched.c:556 elevator_init_mq+0x2cd/0x3f0 block/elevator.c:692 __device_add_disk+0xf1/0x1200 block/genhd.c:706 add_disk include/linux/genhd.h:444 [inline] loop_add+0x554/0x710 drivers/block/loop.c:2176 loop_init+0x26b/0x2b5 drivers/block/loop.c:2387 do_one_initcall+0x1b5/0x6d0 init/main.c:1203 do_initcall_level+0x109/0x25b init/main.c:1270 page_owner free stack trace missing Memory state around the buggy address: ffff8881f05f6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f05f6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881f05f6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881f05f6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f05f6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 29757 Comm: syz-executor.5 Tainted: G B 5.4.219-syzkaller-00012-ga8aad8851131 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:f2fs_release_page+0x2c1/0xa20 fs/f2fs/data.c:3800 Code: 00 4c 03 23 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 2f 61 9f ff bb 90 05 00 00 49 03 1c 24 48 89 d8 48 c1 e8 03 <42> 8a 04 30 84 c0 0f 85 fd 06 00 00 8b 1b bd 00 00 00 40 be 00 00 RSP: 0018:ffff8881e719db50 EFLAGS: 00010206 RAX: 00000000000000b2 RBX: 0000000000000590 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000246 RDI: 0000000000000001 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff0d9270d R10: fffffbfff0d9270d R11: 1ffffffff0d9270c R12: ffff8881f05f63f0 R13: ffffea00078bbcc8 R14: dffffc0000000000 R15: ffffea00078bbcc0 FS: 00007f577f3fb700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f43d943b000 CR3: 00000001a1587000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_page_list+0x135c/0x3360 mm/vmscan.c:1447 shrink_inactive_list+0x51e/0xf60 mm/vmscan.c:1997 shrink_list mm/vmscan.c:2288 [inline] shrink_node_memcg+0x5c1/0x1080 mm/vmscan.c:2618 shrink_node+0x3be/0x1350 mm/vmscan.c:2831 shrink_zones+0x48d/0x960 mm/vmscan.c:3048 do_try_to_free_pages+0x21b/0x990 mm/vmscan.c:3106 try_to_free_mem_cgroup_pages+0x3e5/0x960 mm/vmscan.c:3407 try_charge+0x4fa/0x11f0 mm/memcontrol.c:2616 mem_cgroup_try_charge+0xd5/0x2a0 mm/memcontrol.c:6571 __add_to_page_cache_locked+0x246/0x970 mm/filemap.c:865 add_to_page_cache_lru+0x116/0x2b0 mm/filemap.c:962 pagecache_get_page+0x539/0x760 mm/filemap.c:1701 grab_cache_page_write_begin+0x50/0x90 mm/filemap.c:3261 ext4_da_write_begin+0x5ce/0xf80 fs/ext4/inode.c:3144 generic_perform_write+0x2f9/0x5a0 mm/filemap.c:3311 __generic_file_write_iter+0x239/0x490 mm/filemap.c:3440 ext4_file_write_iter+0x495/0x10e0 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1976 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5e3/0x780 fs/read_write.c:496 __kernel_write+0x12c/0x340 fs/read_write.c:515 dump_emit+0x223/0x360 fs/coredump.c:838 elf_core_dump+0x3f18/0x4870 fs/binfmt_elf.c:2352 do_coredump+0x1faf/0x2ed0 fs/coredump.c:801 get_signal+0xd5b/0x13f0 kernel/signal.c:2729 do_signal+0xb0/0x1200 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xdd/0x1d0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194 retint_user+0x8/0x8 Modules linked in: ---[ end trace 95a6b3389c425e33 ]--- RIP: 0010:f2fs_release_page+0x2c1/0xa20 fs/f2fs/data.c:3800 Code: 00 4c 03 23 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 2f 61 9f ff bb 90 05 00 00 49 03 1c 24 48 89 d8 48 c1 e8 03 <42> 8a 04 30 84 c0 0f 85 fd 06 00 00 8b 1b bd 00 00 00 40 be 00 00 RSP: 0018:ffff8881e719db50 EFLAGS: 00010206 RAX: 00000000000000b2 RBX: 0000000000000590 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000246 RDI: 0000000000000001 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff0d9270d R10: fffffbfff0d9270d R11: 1ffffffff0d9270c R12: ffff8881f05f63f0 R13: ffffea00078bbcc8 R14: dffffc0000000000 R15: ffffea00078bbcc0 FS: 00007f577f3fb700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84e8a72718 CR3: 00000001a1587000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 4c 03 23 add %cl,0x23(%rbx,%rax,1) 4: 4c 89 e0 mov %r12,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 10: 74 08 je 0x1a 12: 4c 89 e7 mov %r12,%rdi 15: e8 2f 61 9f ff callq 0xff9f6149 1a: bb 90 05 00 00 mov $0x590,%ebx 1f: 49 03 1c 24 add (%r12),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 8a 04 30 mov (%rax,%r14,1),%al <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 fd 06 00 00 jne 0x733 36: 8b 1b mov (%rbx),%ebx 38: bd 00 00 00 40 mov $0x40000000,%ebp 3d: be .byte 0xbe