XFS (loop5): Invalid superblock magic number ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff88805293a4a0 by task syz-executor.0/12767 CPU: 0 PID: 12767 Comm: syz-executor.0 Not tainted 4.19.111-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.cold+0x7c/0x212 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396 __list_add_valid+0x93/0xa0 lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2380 [inline] rdma_listen+0x609/0x880 drivers/infiniband/core/cma.c:3408 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1100 ucma_write+0x285/0x350 drivers/infiniband/core/ucma.c:1689 __vfs_write+0xf7/0x760 fs/read_write.c:485 vfs_write+0x206/0x550 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdf81921c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fdf819226d4 RCX: 000000000045c849 RDX: 0000000000000010 RSI: 0000000020000980 RDI: 0000000000000005 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cc0 R14: 00000000004cee66 R15: 000000000076bf0c Allocated by task 12443: set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x4c/0x70 mm/slab.c:3696 kmalloc_node include/linux/slab.h:557 [inline] kzalloc_node include/linux/slab.h:720 [inline] qdisc_alloc+0xb6/0xa40 net/sched/sch_generic.c:836 qdisc_create_dflt+0x70/0x1d0 net/sched/sch_generic.c:910 mq_init+0x363/0x4b0 net/sched/sch_mq.c:95 qdisc_create_dflt+0xff/0x1d0 net/sched/sch_generic.c:917 attach_default_qdiscs net/sched/sch_generic.c:1056 [inline] dev_activate+0x8c1/0xb30 net/sched/sch_generic.c:1095 __dev_open+0x265/0x390 net/core/dev.c:1415 __dev_change_flags+0x4dd/0x620 net/core/dev.c:7663 dev_change_flags+0x7e/0x140 net/core/dev.c:7732 dev_ifsioc+0x286/0x8d0 net/core/dev_ioctl.c:237 dev_ioctl+0x1ab/0xc58 net/core/dev_ioctl.c:488 sock_do_ioctl+0x1b7/0x2f0 net/socket.c:973 sock_ioctl+0x325/0x610 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 12441: set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521 __cache_free mm/slab.c:3503 [inline] kfree+0xce/0x220 mm/slab.c:3822 qdisc_destroy+0x4aa/0x6b0 net/sched/sch_generic.c:997 shutdown_scheduler_queue net/sched/sch_generic.c:1291 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2107 [inline] dev_shutdown+0x11e/0x47a net/sched/sch_generic.c:1297 rollback_registered_many+0x64a/0xc40 net/core/dev.c:8173 rollback_registered+0xf2/0x1c0 net/core/dev.c:8222 unregister_netdevice_queue net/core/dev.c:9275 [inline] unregister_netdevice_queue+0x1d7/0x2b0 net/core/dev.c:9268 unregister_netdevice include/linux/netdevice.h:2614 [inline] __tun_detach+0xd86/0x1020 drivers/net/tun.c:737 tun_detach drivers/net/tun.c:754 [inline] tun_chr_close+0xd9/0x180 drivers/net/tun.c:3261 __fput+0x2cd/0x890 fs/file_table.c:278 task_work_run+0x13f/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x25a/0x2b0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88805293a2c0 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 480 bytes inside of 2048-byte region [ffff88805293a2c0, ffff88805293aac0) The buggy address belongs to the page: page:ffffea00014a4e80 count:1 mapcount:0 mapping:ffff88812c3dcc40 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea00014a9388 ffffea0002264108 ffff88812c3dcc40 raw: 0000000000000000 ffff88805293a2c0 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805293a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805293a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805293a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805293a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805293a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================