ci2 starts bisection 2026-08-08 15:01:45.44080481 +0000 UTC m=+39904.693409894 bisecting fixing commit since 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 building syzkaller on fb92f11c4789d9647a75c09c983dbee5c8488ccf ensuring issue is reproducible on original commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 958bb5b9fe372b324d4234f77cde368f08634f8ca62df17b3bed047affa93a80 run #0: crashed: KASAN: use-after-free Write in pppol2tp_release run #1: crashed: KASAN: use-after-free Read in rcu_cblist_dequeue run #2: crashed: KASAN: use-after-free Write in pppol2tp_release run #3: crashed: KASAN: use-after-free Write in pppol2tp_release run #4: crashed: KASAN: use-after-free Write in pppol2tp_release run #5: crashed: KASAN: use-after-free Write in pppol2tp_release run #6: crashed: KASAN: use-after-free Write in pppol2tp_release run #7: crashed: KASAN: use-after-free Write in pppol2tp_release run #8: crashed: KASAN: use-after-free Write in pppol2tp_release run #9: crashed: KASAN: use-after-free Read in rcu_cblist_dequeue run #10: crashed: KASAN: use-after-free Write in pppol2tp_release run #11: crashed: KASAN: use-after-free Write in pppol2tp_release run #12: crashed: KASAN: use-after-free Write in pppol2tp_release run #13: crashed: KASAN: use-after-free Read in rcu_cblist_dequeue run #14: crashed: KASAN: use-after-free Write in pppol2tp_release run #15: crashed: KASAN: use-after-free Write in pppol2tp_release run #16: crashed: KASAN: use-after-free Write in pppol2tp_release run #17: crashed: KASAN: use-after-free Write in pppol2tp_release run #18: crashed: KASAN: use-after-free Write in pppol2tp_release run #19: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] check whether we can drop unnecessary instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 51e8e8706289ed349a38b033123de84041777a004a2ff7eba4554938d564d9f3 run #0: crashed: KASAN: use-after-free Read in rcu_cblist_dequeue run #1: crashed: KASAN: use-after-free Read in rcu_cblist_dequeue run #2: crashed: KASAN: use-after-free Write in pppol2tp_release run #3: crashed: KASAN: use-after-free Write in pppol2tp_release run #4: crashed: KASAN: use-after-free Write in pppol2tp_release run #5: crashed: KASAN: use-after-free Write in pppol2tp_release run #6: crashed: KASAN: use-after-free Write in pppol2tp_release run #7: crashed: KASAN: use-after-free Write in pppol2tp_release run #8: crashed: KASAN: use-after-free Write in pppol2tp_release run #9: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] the bug reproduces without the instrumentation disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed kconfig minimization: base=4788 full=6024 leaves diff=248 split chunks (needed=false): <248> split chunk #0 of len 248 into 5 parts testing without sub-chunk 1/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 380003b6fb7b7e15189cac3d9656173214abbf1772d74539787c852fbe1e8b85 run #0: crashed: KASAN: use-after-free Write in pppol2tp_release run #1: crashed: KASAN: use-after-free Write in pppol2tp_release run #2: crashed: KASAN: use-after-free Write in pppol2tp_release run #3: crashed: KASAN: use-after-free Write in pppol2tp_release run #4: crashed: KASAN: use-after-free Write in pppol2tp_release run #5: crashed: KASAN: use-after-free Read in pppol2tp_release run #6: crashed: KASAN: use-after-free Read in pppol2tp_release run #7: crashed: KASAN: use-after-free Write in pppol2tp_release run #8: crashed: KASAN: use-after-free Write in pppol2tp_release run #9: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 11fff7f7fbf096944e1281722b0dcbb87c62eac60b669af377467a8c1fd194ce all runs: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 9cfe5bf0a0a1b9bda1c1afe4088f88b57492ccb337f772bcd931798c2052e836 all runs: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: e23ce941197291326eeab77359ee23cc6cc5bc504880b474726c7c6dfd576614 all runs: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit 79e905dd56a79bf38172e6986b7ed5074d0ec3e8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 79e905dd56a79bf38172e6986b7ed5074d0ec3e8: net/socket.c:1128:(.text+0x1307): undefined reference to `wext_handle_ioctl' net/socket.c:3397:(.text+0x17c7): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346:(.text+0x33b): undefined reference to `wext_proc_exit' net/core/net-procfs.c:330:(.text+0x4e2): undefined reference to `wext_proc_init' minimized to 48 configs; suspects: [HID_ZEROPLUS USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_DM9601 USB_NET_GL620A USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL USB_SERIAL_FTDI_SIO USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM USB_XHCI_PCI_RENESAS WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS ZEROPLUS_FF] disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing current HEAD 447db0046f21df411c817f9f05b9f6210adb9d81 testing commit 447db0046f21df411c817f9f05b9f6210adb9d81 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 074c2c5f25e2fe166b5539ac51b5c58c621a24de73c15b0294a126c338b6ff91 all runs: crashed: KASAN: use-after-free Write in pppol2tp_release representative crash: KASAN: use-after-free Write in pppol2tp_release, types: [KASAN-USE-AFTER-FREE-WRITE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h13m23.46361685s (build: 19m47.632123431s, test: 37m13.236364274s) crash still not fixed or there were kernel test errors commit msg: Merge 39ca700c8ac0 ("crypto: af_alg - Remove zero-copy support from skcipher and aead") into android13-5.10-lts crash: KASAN: use-after-free Write in pppol2tp_release ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:173 [inline] BUG: KASAN: use-after-free in mutex_lock+0x6b/0xd0 kernel/locking/mutex.c:298 Write of size 8 at addr ffff888113a8b550 by task syz.2.17/474 CPU: 0 PID: 474 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x81/0xac lib/dump_stack.c:118 print_address_description.constprop.0+0x24/0x160 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report.cold+0x82/0xdb mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x148/0x190 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] atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] __mutex_trylock_fast kernel/locking/mutex.c:173 [inline] mutex_lock+0x6b/0xd0 kernel/locking/mutex.c:298 pppol2tp_release+0x21a/0x3e0 net/l2tp/l2tp_ppp.c:442 __sock_release+0xc2/0x270 net/socket.c:597 sock_close+0x10/0x20 net/socket.c:1287 __fput+0x237/0x760 fs/file_table.c:281 ____fput+0x9/0x10 fs/file_table.c:314 task_work_run+0xc2/0x140 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x150/0x160 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x27/0x160 kernel/entry/common.c:274 do_syscall_64+0x3f/0x50 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fbd39ad7e59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdfe728da8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffdfe728e90 RCX: 00007fbd39ad7e59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000009f82 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b31520000 R11: 0000000000000246 R12: 00007ffdfe728ed0 R13: 00007fbd39d50fac R14: 0000000000009fb5 R15: 00007fbd39d50fa0 Allocated by task 475: kasan_save_stack+0x26/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] ____kasan_kmalloc mm/kasan/common.c:468 [inline] __kasan_kmalloc+0xae/0xe0 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1cd/0x360 mm/slub.c:4038 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [inline] l2tp_session_create+0x38/0xa80 net/l2tp/l2tp_core.c:1616 pppol2tp_connect+0xe03/0x19c0 net/l2tp/l2tp_ppp.c:772 __sys_connect_file+0x136/0x190 net/socket.c:1867 __sys_connect+0x101/0x130 net/socket.c:1884 __do_sys_connect net/socket.c:1894 [inline] __se_sys_connect net/socket.c:1891 [inline] __x64_sys_connect+0x6e/0xb0 net/socket.c:1891 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 474: kasan_save_stack+0x26/0x50 mm/kasan/common.c:38 kasan_set_track+0x25/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x24/0x40 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:362 [inline] ____kasan_slab_free mm/kasan/common.c:324 [inline] __kasan_slab_free+0x111/0x150 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0x9b/0x1a0 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc2/0x4e0 mm/slub.c:4196 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline] l2tp_session_put+0x7d/0x130 net/l2tp/l2tp_core.c:193 l2tp_session_delete net/l2tp/l2tp_core.c:1589 [inline] l2tp_session_delete+0x1c8/0x440 net/l2tp/l2tp_core.c:1578 pppol2tp_release+0x212/0x3e0 net/l2tp/l2tp_ppp.c:439 __sock_release+0xc2/0x270 net/socket.c:597 sock_close+0x10/0x20 net/socket.c:1287 __fput+0x237/0x760 fs/file_table.c:281 ____fput+0x9/0x10 fs/file_table.c:314 task_work_run+0xc2/0x140 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x150/0x160 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x27/0x160 kernel/entry/common.c:274 do_syscall_64+0x3f/0x50 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888113a8b400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 336 bytes inside of 512-byte region [ffff888113a8b400, ffff888113a8b600) The buggy address belongs to the page: page:ffffea00044ea200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113a88 head:ffffea00044ea200 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 319, ts 40849098613, free_ts 40848210613 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page mm/page_alloc.c:2462 [inline] get_page_from_freelist+0x1fee/0x2ad0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x2ae/0x2540 mm/page_alloc.c:5384 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] alloc_slab_page mm/slub.c:1670 [inline] allocate_slab+0x30f/0x460 mm/slub.c:1813 new_slab mm/slub.c:1874 [inline] new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc.constprop.0+0x32b/0x730 mm/slub.c:2796 __slab_alloc mm/slub.c:2836 [inline] slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc+0x32d/0x360 mm/slub.c:4034 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [inline] neigh_alloc net/core/neighbour.c:439 [inline] ___neigh_create+0xc5f/0x1be0 net/core/neighbour.c:592 __neigh_create+0x12/0x20 net/core/neighbour.c:680 ip6_finish_output2+0xceb/0x1960 net/ipv6/ip6_output.c:127 __ip6_finish_output.part.0+0x272/0x7b0 net/ipv6/ip6_output.c:201 __ip6_finish_output net/ipv6/ip6_output.c:216 [inline] ip6_finish_output+0x1cb/0x340 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:288 [inline] ip6_output+0x1d0/0x440 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:451 [inline] ip6_local_out+0x6a/0x90 net/ipv6/output_core.c:161 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline] udp_tunnel6_xmit_skb+0x5f1/0xb60 net/ipv6/ip6_udp_tunnel.c:110 send6+0x425/0xa20 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer+0xc7/0x1d0 drivers/net/wireguard/socket.c:178 wg_socket_send_buffer_to_peer+0x12e/0x190 drivers/net/wireguard/socket.c:200 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_pages_ok+0x44b/0x840 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xda/0xf0 mm/page_alloc.c:5454 __free_slab+0xde/0x1d0 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab+0x2b/0x40 mm/slub.c:1920 unfreeze_partials+0x1e1/0x240 mm/slub.c:2415 put_cpu_partial+0xce/0x120 mm/slub.c:2451 __slab_free+0x23f/0x560 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x255/0x2b0 mm/slub.c:3215 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x71/0x150 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15f/0x1c0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xaa/0xc0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook mm/slab.h:580 [inline] slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x39f/0x4f0 mm/slub.c:2965 sock_alloc_inode+0x17/0x1b0 net/socket.c:253 alloc_inode+0x5c/0x1e0 fs/inode.c:233 new_inode_pseudo+0xe/0xd0 fs/inode.c:968 sock_alloc+0x3c/0x270 net/socket.c:574 Memory state around the buggy address: ffff888113a8b400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113a8b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888113a8b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113a8b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113a8b600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================