================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:705 [inline] BUG: KASAN: use-after-free in queued_write_lock include/asm-generic/qrwlock.h:92 [inline] BUG: KASAN: use-after-free in __raw_write_lock_bh include/linux/rwlock_api_smp.h:204 [inline] BUG: KASAN: use-after-free in _raw_write_lock_bh+0x97/0x170 kernel/locking/spinlock.c:319 Write of size 4 at addr ffff888115b6d010 by task kworker/0:30/1560 CPU: 0 PID: 1560 Comm: kworker/0:30 Not tainted 5.10.234-syzkaller-00033-g094fc3778d6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events tipc_net_finalize_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:705 [inline] queued_write_lock include/asm-generic/qrwlock.h:92 [inline] __raw_write_lock_bh include/linux/rwlock_api_smp.h:204 [inline] _raw_write_lock_bh+0x97/0x170 kernel/locking/spinlock.c:319 tipc_mon_reinit_self+0xca/0x5e0 net/tipc/monitor.c:687 tipc_net_finalize+0xdc/0x130 net/tipc/net.c:135 tipc_net_finalize_work+0x65/0x90 net/tipc/net.c:144 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 10746: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] tipc_mon_create+0x115/0x5e0 net/tipc/monitor.c:626 tipc_enable_bearer net/tipc/bearer.c:349 [inline] __tipc_nl_bearer_enable+0xbac/0x1140 net/tipc/bearer.c:1020 tipc_nl_bearer_enable+0x22/0x30 net/tipc/bearer.c:1029 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x115d/0x16e0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485 genl_rcv+0x28/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 111: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 tipc_mon_delete+0x54e/0x680 net/tipc/monitor.c:675 bearer_disable+0x235/0x2c0 net/tipc/bearer.c:409 tipc_bearer_stop+0xbf/0x1c0 net/tipc/bearer.c:730 tipc_net_stop+0xcd/0x130 net/tipc/net.c:153 tipc_exit_net+0x82/0x160 net/tipc/core.c:114 ops_exit_list net/core/net_namespace.c:185 [inline] cleanup_net+0x66c/0xcb0 net/core/net_namespace.c:609 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff888115b6c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4112 bytes inside of 8192-byte region [ffff888115b6c000, ffff888115b6e000) The buggy address belongs to the page: page:ffffea000456da00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115b68 head:ffffea000456da00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042a80 raw: 0000000000000000 0000000000020002 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9534, ts 331812615014, free_ts 330726229450 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc_trace+0x1bd/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] audit_log_d_path+0xa1/0x2b0 kernel/audit.c:2150 audit_log_d_path_exe+0x42/0x70 kernel/audit.c:2221 audit_log_task+0x20d/0x2e0 kernel/auditsc.c:2631 audit_seccomp+0x7a/0x1e0 kernel/auditsc.c:2678 seccomp_log kernel/seccomp.c:1004 [inline] __seccomp_filter+0xd03/0x1e10 kernel/seccomp.c:1247 __secure_computing+0xf0/0x300 kernel/seccomp.c:1313 syscall_trace_enter kernel/entry/common.c:58 [inline] __syscall_enter_from_user_work kernel/entry/common.c:81 [inline] syscall_enter_from_user_mode+0xbf/0x1a0 kernel/entry/common.c:99 do_syscall_64+0x13/0x70 arch/x86/entry/common.c:41 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page+0x9e/0x370 mm/page_alloc.c:5407 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 __vunmap+0x7c1/0x940 mm/vmalloc.c:2301 __vfree mm/vmalloc.c:2350 [inline] vfree+0x5c/0x80 mm/vmalloc.c:2381 kcov_mmap+0x93/0x130 kernel/kcov.c:489 call_mmap include/linux/fs.h:2063 [inline] mmap_file+0x5f/0xb0 mm/util.c:1085 __mmap_region mm/mmap.c:1872 [inline] mmap_region+0x149f/0x1cd0 mm/mmap.c:3063 do_mmap+0x800/0xeb0 mm/mmap.c:1649 vm_mmap_pgoff+0x201/0x390 mm/util.c:543 ksys_mmap_pgoff+0x16f/0x1f0 mm/mmap.c:1700 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888115b6cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888115b6cf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888115b6d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888115b6d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888115b6d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 1560 Comm: kworker/0:30 Tainted: G B 5.10.234-syzkaller-00033-g094fc3778d6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events tipc_net_finalize_work RIP: 0010:tipc_mon_reinit_self+0x168/0x5e0 net/tipc/monitor.c:688 Code: 8b 33 49 81 c4 08 10 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 c3 56 11 fd 49 8b 1c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 83 03 00 00 44 89 33 48 8b 7d c8 e8 bf RSP: 0018:ffffc900010b7c98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff849707cd RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffff888115b6d008 RBP: ffffc900010b7cd0 R08: dffffc0000000000 R09: 0000000000000003 R10: fffff52000216f84 R11: dffffc0000000001 R12: ffff888115b6d008 R13: dffffc0000000000 R14: 000000000f1414ac R15: ffff8881283e46f8 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010a7c6000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tipc_net_finalize+0xdc/0x130 net/tipc/net.c:135 tipc_net_finalize_work+0x65/0x90 net/tipc/net.c:144 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace 722b9b8a24b3c3b8 ]--- RIP: 0010:tipc_mon_reinit_self+0x168/0x5e0 net/tipc/monitor.c:688 Code: 8b 33 49 81 c4 08 10 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 c3 56 11 fd 49 8b 1c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 83 03 00 00 44 89 33 48 8b 7d c8 e8 bf RSP: 0018:ffffc900010b7c98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff849707cd RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffff888115b6d008 RBP: ffffc900010b7cd0 R08: dffffc0000000000 R09: 0000000000000003 R10: fffff52000216f84 R11: dffffc0000000001 R12: ffff888115b6d008 R13: dffffc0000000000 R14: 000000000f1414ac R15: ffff8881283e46f8 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000660f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 33 mov (%rbx),%esi 2: 49 81 c4 08 10 00 00 add $0x1008,%r12 9: 4c 89 e0 mov %r12,%rax c: 48 c1 e8 03 shr $0x3,%rax 10: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 15: 74 08 je 0x1f 17: 4c 89 e7 mov %r12,%rdi 1a: e8 c3 56 11 fd call 0xfd1156e2 1f: 49 8b 1c 24 mov (%r12),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 83 03 00 00 jne 0x3ba 37: 44 89 33 mov %r14d,(%rbx) 3a: 48 8b 7d c8 mov -0x38(%rbp),%rdi 3e: e8 .byte 0xe8 3f: bf .byte 0xbf