KASAN: use-after-free Read in tcp_retransmit

Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
linux-6.1	KASAN: use-after-free Read in tcp_retransmit_timer (3)			1	143d	143d	0/3	auto-obsoleted due to no activity on 2025/03/13 12:53
linux-4.19	KASAN: use-after-free Read in tcp_retransmit_timer (3)			1	908d	908d	0/1	auto-obsoleted due to no activity on 2023/02/27 17:38
linux-4.14	KASAN: slab-out-of-bounds Read in tcp_retransmit_timer			5	1448d	1523d	0/1	auto-closed as invalid on 2021/09/06 04:07
linux-6.1	KASAN: use-after-free Read in tcp_retransmit_timer			14	391d	409d	0/3	auto-obsoleted due to no activity on 2024/06/08 21:34
linux-5.15	KASAN: use-after-free Read in tcp_retransmit_timer (2)			13	365d	550d	0/3	auto-obsoleted due to no activity on 2024/08/04 05:25
linux-4.19	KASAN: use-after-free Read in tcp_retransmit_timer			2	1946d	1948d	0/1	auto-closed as invalid on 2020/04/25 09:53
linux-5.15	KASAN: use-after-free Read in tcp_retransmit_timer (3)			4	10d	88d	0/3	upstream: reported on 2025/01/28 00:08
upstream	KASAN: use-after-free Read in tcp_retransmit_timer (2) net			1	2231d	2231d	0/28	closed as invalid on 2019/04/19 21:45
linux-6.1	KASAN: use-after-free Read in tcp_retransmit_timer (2)			1	301d	301d	0/3	auto-obsoleted due to no activity on 2024/10/06 20:00
upstream	KASAN: use-after-free Read in tcp_retransmit_timer (5) net	C	unreliable	16000	875d	1888d	22/28	fixed on 2023/02/24 13:50
linux-4.19	KASAN: use-after-free Read in tcp_retransmit_timer (2)			6	1377d	1544d	0/1	auto-closed as invalid on 2021/11/16 03:14
upstream	KASAN: use-after-free Read in tcp_retransmit_timer (3) net			5	2143d	2163d	0/28	closed as invalid on 2019/07/01 18:06
upstream	KASAN: use-after-free Read in tcp_retransmit_timer net			4	2274d	2388d	0/28	closed as invalid on 2019/03/10 18:51
linux-4.19	KASAN: slab-out-of-bounds Read in tcp_retransmit_timer			9	1054d	1233d	0/1	auto-obsoleted due to no activity on 2022/10/04 11:51
upstream	KASAN: use-after-free Read in tcp_retransmit_timer (4) net			2	2088d	2088d	0/28	closed as invalid on 2019/10/03 04:18
linux-5.15	KASAN: use-after-free Read in tcp_retransmit_timer			76	660d	767d	0/3	auto-obsoleted due to no activity on 2023/09/14 02:10

================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x751/0x2830 net/ipv4/tcp_timer.c:546 Read of size 8 at addr ffff88802fbd1f08 by task syz.6.1370/11157 CPU: 0 PID: 11157 Comm: syz.6.1370 Not tainted 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:427 kasan_report+0x136/0x160 mm/kasan/report.c:531 tcp_retransmit_timer+0x751/0x2830 net/ipv4/tcp_timer.c:546 tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:676 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1820 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:661 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:__preempt_count_add kernel/rcu/tree.c:717 [inline] RIP: 0010:rcu_is_watching+0x2/0xb0 kernel/rcu/tree.c:720 Code: 44 24 21 02 0f 84 02 ff ff ff e9 6c ff ff ff 48 c7 c7 e0 50 33 8d 4c 89 f6 e8 fa 2d fb 02 e9 2b ff ff ff e8 80 8b 3d 09 41 57 <41> 56 53 65 ff 05 8c 27 8f 7e e8 bf a3 3d 09 89 c3 83 f8 08 73 76 RSP: 0018:ffffc90004cf75c8 EFLAGS: 00000257 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81699ea2 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ea0bd28 RBP: ffffc90004cf7750 R08: dffffc0000000000 R09: fffffbfff1d417a6 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff888054908528 R14: 0000000000000000 R15: 0000000000000000 trace_contention_begin+0x61/0x170 include/trace/events/lock.h:95 __mutex_lock_common kernel/locking/mutex.c:605 [inline] __mutex_lock+0x143/0xd80 kernel/locking/mutex.c:747 __unix_dgram_recvmsg+0x24e/0x12c0 net/unix/af_unix.c:2424 ____sys_recvmsg+0x285/0x530 net/socket.c:-1 ___sys_recvmsg net/socket.c:2780 [inline] do_recvmmsg+0x46d/0xad0 net/socket.c:2874 __sys_recvmmsg net/socket.c:2953 [inline] __do_sys_recvmmsg net/socket.c:2976 [inline] __se_sys_recvmmsg net/socket.c:2969 [inline] __x64_sys_recvmmsg+0x195/0x240 net/socket.c:2969 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3d5378e169 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:00007f3d54592038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f3d539b6080 RCX: 00007f3d5378e169 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f3d53810a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3d539b6080 R15: 00007ffdd2a32d68 </TASK> Allocated by task 4764: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:689 [inline] net_alloc net/core/net_namespace.c:423 [inline] copy_net_ns+0x13c/0x590 net/core/net_namespace.c:495 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226 ksys_unshare+0x531/0xa40 kernel/fork.c:3201 __do_sys_unshare kernel/fork.c:3272 [inline] __se_sys_unshare kernel/fork.c:3270 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3270 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 4422: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x292/0x510 mm/slub.c:3683 net_complete_free net/core/net_namespace.c:459 [inline] cleanup_net+0x99a/0xd20 net/core/net_namespace.c:653 process_one_work+0x917/0x1260 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1544 [inline] __run_timers+0x6a8/0x890 kernel/time/timer.c:1820 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:661 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1544 [inline] __run_timers+0x6a8/0x890 kernel/time/timer.c:1820 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578 run_ksoftirqd+0xc6/0x120 kernel/softirq.c:945 smpboot_thread_fn+0x52c/0xa30 kernel/smpboot.c:164 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88802fbd1c40 which belongs to the cache net_namespace of size 6976 The buggy address is located 712 bytes inside of 6976-byte region [ffff88802fbd1c40, ffff88802fbd3780) The buggy address belongs to the physical page: page:ffffea0000bef400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2fbd0 head:ffffea0000bef400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888056b41981 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000a64e00 dead000000000002 ffff888017e38500 raw: 0000000000000000 0000000080040004 00000001ffffffff ffff888056b41981 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 4253, tgid 4253 (syz-executor), ts 68878512574, free_ts 68875136158 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4328 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5606 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:689 [inline] net_alloc net/core/net_namespace.c:423 [inline] copy_net_ns+0x13c/0x590 net/core/net_namespace.c:495 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226 ksys_unshare+0x531/0xa40 kernel/fork.c:3201 __do_sys_unshare kernel/fork.c:3272 [inline] __se_sys_unshare kernel/fork.c:3270 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3270 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586 put_cpu_partial+0x17b/0x250 mm/slub.c:2662 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x137/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa1/0x230 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] tomoyo_add_entry security/tomoyo/common.c:2022 [inline] tomoyo_supervisor+0xeda/0x12d0 security/tomoyo/common.c:2094 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x58d/0x7f0 security/tomoyo/file.c:734 security_file_ioctl+0x6d/0xa0 security/security.c:1568 __do_sys_ioctl fs/ioctl.c:864 [inline] __se_sys_ioctl+0x47/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88802fbd1e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802fbd1e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802fbd1f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802fbd1f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802fbd2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 21 02 and %eax,(%rdx) 2: 0f 84 02 ff ff ff je 0xffffff0a 8: e9 6c ff ff ff jmp 0xffffff79 d: 48 c7 c7 e0 50 33 8d mov $0xffffffff8d3350e0,%rdi 14: 4c 89 f6 mov %r14,%rsi 17: e8 fa 2d fb 02 call 0x2fb2e16 1c: e9 2b ff ff ff jmp 0xffffff4c 21: e8 80 8b 3d 09 call 0x93d8ba6 26: 41 57 push %r15 * 28: 41 56 push %r14 <-- trapping instruction 2a: 53 push %rbx 2b: 65 ff 05 8c 27 8f 7e incl %gs:0x7e8f278c(%rip) # 0x7e8f27be 32: e8 bf a3 3d 09 call 0x93da3f6 37: 89 c3 mov %eax,%ebx 39: 83 f8 08 cmp $0x8,%eax 3c: 73 76 jae 0xb4

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/04/18 02:58	linux-6.1.y	420102835862	2a20f901	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan	KASAN: use-after-free Read in tcp_retransmit_timer
2025/03/28 06:40	linux-6.1.y	344a09659766	6c09fb82	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan	KASAN: use-after-free Read in tcp_retransmit_timer

Crashes (2):

Assets (help?)