ci2 starts bisection 2026-09-13 18:45:35.257477785 +0000 UTC m=+150998.253770110 bisecting fixing commit since 92668decd5e08edc7a6c138256abd2c37c4970f2 building syzkaller on 5d63f80b763910b40ae04a96c13dc75d621bea67 ensuring issue is reproducible on original commit 92668decd5e08edc7a6c138256abd2c37c4970f2 testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: c3d6ddcadfaeacf6a1339436d989fbf42d2e2bc0adbb3de20b4742fe41fb33a5 run #0: crashed: KASAN: use-after-free Read in check_tty_count run #1: crashed: KASAN: use-after-free Read in check_tty_count run #2: crashed: KASAN: use-after-free Read in check_tty_count run #3: crashed: KASAN: use-after-free Read in check_tty_count run #4: crashed: KASAN: use-after-free Read in check_tty_count run #5: crashed: KASAN: use-after-free Read in check_tty_count run #6: crashed: KASAN: use-after-free Read in check_tty_count run #7: crashed: KASAN: use-after-free Read in check_tty_count run #8: crashed: KASAN: use-after-free Read in check_tty_count run #9: crashed: KASAN: use-after-free Read in check_tty_count run #10: crashed: KASAN: use-after-free Read in check_tty_count run #11: crashed: KASAN: use-after-free Read in check_tty_count run #12: crashed: KASAN: use-after-free Read in check_tty_count run #13: crashed: KASAN: use-after-free Read in check_tty_count run #14: crashed: KASAN: use-after-free Read in check_tty_count run #15: crashed: KASAN: use-after-free Read in check_tty_count run #16: crashed: KASAN: use-after-free Read in check_tty_count run #17: crashed: KASAN: use-after-free Read in check_tty_count run #18: crashed: KASAN: use-after-free Read in tty_open run #19: crashed: KASAN: use-after-free Read in check_tty_count representative crash: KASAN: use-after-free Read in check_tty_count, types: [KASAN-USE-AFTER-FREE-READ] check whether we can drop unnecessary instrumentation disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 7c766ebe630e94c95b1a9ed96c6dd33a91afaf980d1fab6e76e171865d40b54a run #0: crashed: KASAN: use-after-free Read in check_tty_count run #1: crashed: KASAN: use-after-free Read in tty_open run #2: crashed: KASAN: use-after-free Read in tty_open run #3: crashed: KASAN: use-after-free Read in check_tty_count run #4: crashed: KASAN: use-after-free Read in check_tty_count run #5: crashed: KASAN: use-after-free Read in check_tty_count run #6: crashed: KASAN: use-after-free Read in check_tty_count run #7: crashed: KASAN: use-after-free Read in check_tty_count run #8: crashed: KASAN: use-after-free Read in check_tty_count run #9: crashed: KASAN: use-after-free Read in check_tty_count representative crash: KASAN: use-after-free Read in check_tty_count, types: [KASAN-USE-AFTER-FREE-READ] the bug reproduces without the instrumentation disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed kconfig minimization: base=5186 full=6558 leaves diff=267 split chunks (needed=false): <267> split chunk #0 of len 267 into 5 parts testing without sub-chunk 1/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: e67084ad4a203cb669ecb654f93bd0932bed6073ebd834310860be6a9234ef78 run #0: crashed: KASAN: use-after-free Read in check_tty_count run #1: crashed: KASAN: use-after-free Read in check_tty_count run #2: crashed: KASAN: use-after-free Read in check_tty_count run #3: crashed: KASAN: use-after-free Read in check_tty_count run #4: crashed: KASAN: use-after-free Read in check_tty_count run #5: crashed: KASAN: use-after-free Read in check_tty_count run #6: crashed: KASAN: use-after-free Read in check_tty_count run #7: crashed: KASAN: use-after-free Read in tty_open run #8: crashed: KASAN: use-after-free Read in check_tty_count run #9: crashed: KASAN: use-after-free Read in check_tty_count representative crash: KASAN: use-after-free Read in check_tty_count, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 743a48b94131a54e65abda497a21ac934be75d6774deed19f6efc7f987e41513 run #0: crashed: KASAN: use-after-free Read in check_tty_count run #1: crashed: KASAN: use-after-free Read in check_tty_count run #2: crashed: KASAN: use-after-free Read in check_tty_count run #3: crashed: KASAN: use-after-free Read in check_tty_count run #4: crashed: KASAN: use-after-free Read in check_tty_count run #5: crashed: KASAN: use-after-free Read in check_tty_count run #6: crashed: KASAN: use-after-free Read in tty_open run #7: crashed: KASAN: use-after-free Read in check_tty_count run #8: crashed: KASAN: use-after-free Read in check_tty_count run #9: crashed: KASAN: use-after-free Read in check_tty_count representative crash: KASAN: use-after-free Read in check_tty_count, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 00d7f73959a66bc17707e05b2d20f982407b989abf7f318f4c661fdfc3c3355c run #0: crashed: KASAN: use-after-free Read in tty_open run #1: crashed: KASAN: use-after-free Read in check_tty_count run #2: crashed: KASAN: use-after-free Read in check_tty_count run #3: crashed: KASAN: use-after-free Read in check_tty_count run #4: crashed: KASAN: use-after-free Read in check_tty_count run #5: crashed: KASAN: use-after-free Read in check_tty_count run #6: crashed: KASAN: use-after-free Read in check_tty_count run #7: crashed: KASAN: use-after-free Read in check_tty_count run #8: crashed: KASAN: use-after-free Read in tty_open run #9: crashed: KASAN: use-after-free Read in check_tty_count representative crash: KASAN: use-after-free Read in tty_open, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 7c9713d007a66f5d56ae197be73419f26823f2d0b0f0032a3b3e09e05f56fc92 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit 92668decd5e08edc7a6c138256abd2c37c4970f2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 failed building 92668decd5e08edc7a6c138256abd2c37c4970f2: ld.lld: error: undefined symbol: wext_proc_init ld.lld: error: undefined symbol: wext_proc_exit ld.lld: error: undefined symbol: wext_handle_ioctl ld.lld: error: undefined symbol: compat_wext_handle_ioctl minimized to 105 configs; suspects: [COMMON_CLK HAVE_CLK HID_ZEROPLUS SND SOUND USB_ARMLINUX USB_BELKIN USB_CONFIGFS USB_CONFIGFS_ACM USB_CONFIGFS_ECM USB_CONFIGFS_ECM_SUBSET USB_CONFIGFS_EEM USB_CONFIGFS_F_ACC USB_CONFIGFS_F_AUDIO_SRC USB_CONFIGFS_F_FS USB_CONFIGFS_F_HID USB_CONFIGFS_F_LB_SS USB_CONFIGFS_F_MIDI USB_CONFIGFS_F_PRINTER USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CONFIGFS_UEVENT USB_DWC3_OF_SIMPLE USB_EHSET_TEST_FIXTURE USB_F_ACC USB_F_ACM USB_F_AUDIO_SRC USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI USB_F_NCM USB_F_OBEX USB_F_PRINTER USB_F_RNDIS USB_F_SERIAL USB_F_SS_LB USB_F_SUBSET USB_F_UAC1 USB_F_UAC1_LEGACY USB_F_UAC2 USB_F_UVC USB_GADGET_DEBUG_FILES USB_GADGET_DEBUG_FS USB_IPHETH USB_ISP1760 USB_ISP1760_HCD USB_ISP1760_HOST_ROLE USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_MON USB_NET_CDC_MBIM 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_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 V4L2_ASYNC V4L2_FWNODE VIDEO_CAMERA_SENSOR WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_PURELIFI WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_SILABS WLAN_VENDOR_ZYDAS ZEROPLUS_FF] disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing current HEAD 6308d6d3f1b14871eacf2a598b2fa32b93d167b4 testing commit 6308d6d3f1b14871eacf2a598b2fa32b93d167b4 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 2b7dc8c45417429b51b40dfe5c2671754119dccc9aea800adaf55f2ee595e209 run #0: crashed: KASAN: use-after-free Read in tty_open run #1: crashed: KASAN: use-after-free Read in check_tty_count run #2: crashed: KASAN: use-after-free Read in check_tty_count run #3: crashed: KASAN: use-after-free Read in check_tty_count run #4: crashed: KASAN: use-after-free Read in check_tty_count run #5: crashed: KASAN: use-after-free Read in check_tty_count run #6: crashed: KASAN: use-after-free Read in tty_open run #7: crashed: KASAN: use-after-free Read in check_tty_count run #8: crashed: KASAN: use-after-free Read in check_tty_count run #9: crashed: KASAN: use-after-free Read in check_tty_count representative crash: KASAN: use-after-free Read in tty_open, types: [KASAN-USE-AFTER-FREE-READ] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h45m35.368755906s (build: 22m53.381241262s, test: 1h1m20.347299727s) crash still not fixed or there were kernel test errors commit msg: UPSTREAM: Bluetooth: hci_conn: fix potential UAF in create_big_sync crash: KASAN: use-after-free Read in tty_open ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: use-after-free in tty_port_kopened include/linux/tty_port.h:228 [inline] BUG: KASAN: use-after-free in tty_open_by_driver drivers/tty/tty_io.c:2060 [inline] BUG: KASAN: use-after-free in tty_open+0x7a7/0xdd0 drivers/tty/tty_io.c:2128 Read of size 8 at addr ffff88811aad7910 by task syz.0.17/480 CPU: 1 PID: 480 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x19/0x1c lib/dump_stack.c:88 dump_stack_lvl+0xcc/0x11c lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:72 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] tty_port_kopened include/linux/tty_port.h:228 [inline] tty_open_by_driver drivers/tty/tty_io.c:2060 [inline] tty_open+0x7a7/0xdd0 drivers/tty/tty_io.c:2128 chrdev_open+0x4e2/0x5f0 fs/char_dev.c:414 do_dentry_open+0x68c/0xed0 fs/open.c:884 vfs_open+0x6e/0x80 fs/open.c:1017 do_open fs/namei.c:3633 [inline] path_openat+0x2047/0x2610 fs/namei.c:3790 do_filp_open+0x1dd/0x3d0 fs/namei.c:3817 do_sys_openat2+0x125/0x720 fs/open.c:1343 do_sys_open fs/open.c:1359 [inline] __do_sys_openat fs/open.c:1375 [inline] __se_sys_openat fs/open.c:1370 [inline] __x64_sys_openat+0xf1/0x120 fs/open.c:1370 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fbe2419e0d9 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:00007fbe24f81028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbe24425fa0 RCX: 00007fbe2419e0d9 RDX: 0000000000000002 RSI: 0000200000000800 RDI: ffffffffffffff9c RBP: 00007fbe24235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbe24426038 R14: 00007fbe24425fa0 R15: 00007fff9d03ccc8 Allocated by task 475: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] kmalloc_trace+0x40/0xb0 mm/slab_common.c:1033 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] gs_port_alloc drivers/usb/gadget/function/u_serial.c:1166 [inline] gserial_alloc_line_no_console+0x202/0x6b0 drivers/usb/gadget/function/u_serial.c:1246 obex_alloc_inst+0x81/0xc0 drivers/usb/gadget/function/f_obex.c:435 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xf3/0x2d0 drivers/usb/gadget/functions.c:44 function_make+0x102/0x320 drivers/usb/gadget/configfs.c:652 configfs_mkdir+0x4ae/0x910 fs/configfs/dir.c:1329 vfs_mkdir+0x2cc/0x460 fs/namei.c:4113 do_mkdirat+0x13a/0x420 fs/namei.c:4138 __do_sys_mkdirat fs/namei.c:4153 [inline] __se_sys_mkdirat fs/namei.c:4151 [inline] __x64_sys_mkdirat+0x84/0x90 fs/namei.c:4151 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 475: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728 kfree+0x6f/0xf0 mm/slab_common.c:990 gserial_free_port+0x1e0/0x270 drivers/usb/gadget/function/u_serial.c:1210 gserial_free_line+0x85/0xb0 drivers/usb/gadget/function/u_serial.c:1227 obex_free_inst+0x34/0x60 drivers/usb/gadget/function/f_obex.c:421 usb_put_function_instance+0x91/0xa0 drivers/usb/gadget/functions.c:77 obex_attr_release+0x9/0x10 drivers/usb/gadget/function/f_obex.c:391 config_item_cleanup fs/configfs/item.c:128 [inline] config_item_release fs/configfs/item.c:137 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x134/0x180 fs/configfs/item.c:149 configfs_rmdir+0x84c/0x900 fs/configfs/dir.c:1540 vfs_rmdir+0x19e/0x3f0 fs/namei.c:4198 do_rmdir+0x1ec/0x5a0 fs/namei.c:4259 __do_sys_rmdir fs/namei.c:4278 [inline] __se_sys_rmdir fs/namei.c:4276 [inline] __x64_sys_rmdir+0x44/0x50 fs/namei.c:4276 x64_sys_call+0x68e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:85 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88811aad7800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 272 bytes inside of 1024-byte region [ffff88811aad7800, ffff88811aad7c00) The buggy address belongs to the physical page: page:ffffea00046ab400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11aad0 head:ffffea00046ab400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043080 raw: 0000000000000000 0000000000100010 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8, tgid 8 (kworker/u4:0), ts 44487770558, free_ts 44296952065 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook mm/page_alloc.c:2673 [inline] prep_new_page+0x594/0x660 mm/page_alloc.c:2680 get_page_from_freelist+0x304b/0x30c0 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x7c/0x360 mm/slub.c:2020 ___slab_alloc+0x5ee/0x990 mm/slub.c:3177 __slab_alloc+0x53/0x90 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0x93/0x180 mm/slab_common.c:958 kmalloc_reserve net/core/skbuff.c:449 [inline] __alloc_skb+0x19d/0x3f0 net/core/skbuff.c:518 alloc_skb include/linux/skbuff.h:1322 [inline] nlmsg_new include/net/netlink.h:987 [inline] __neigh_notify+0x7f/0x100 net/core/neighbour.c:3516 neigh_cleanup_and_release+0x1f/0x120 net/core/neighbour.c:101 neigh_flush_dev+0x641/0x7a0 net/core/neighbour.c:429 __neigh_ifdown+0x44/0x390 net/core/neighbour.c:446 neigh_ifdown+0xb/0x10 net/core/neighbour.c:464 rt6_disable_ip+0x6c5/0x730 net/ipv6/route.c:4933 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x748/0x750 mm/page_alloc.c:3622 free_unref_page+0x95/0x4e0 mm/page_alloc.c:3720 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x66/0xe0 mm/page_alloc.c:6021 __free_slab+0xae/0x160 mm/slub.c:2044 free_slab mm/slub.c:2059 [inline] discard_slab mm/slub.c:2065 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2614 put_cpu_partial+0x9c/0xc0 mm/slub.c:2690 __slab_free+0x1c4/0x280 mm/slub.c:3589 do_slab_free mm/slub.c:3666 [inline] ___cache_free+0xbf/0xd0 mm/slub.c:3722 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x280 mm/slab.h:768 slab_alloc_node mm/slub.c:3382 [inline] __kmem_cache_alloc_node+0x194/0x2d0 mm/slub.c:3423 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ____ip_mc_inc_group+0x101/0x690 net/ipv4/igmp.c:1452 __ip_mc_inc_group net/ipv4/igmp.c:1487 [inline] ip_mc_inc_group net/ipv4/igmp.c:1493 [inline] ip_mc_up+0xe3/0x180 net/ipv4/igmp.c:1792 Memory state around the buggy address: ffff88811aad7800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811aad7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811aad7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811aad7980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811aad7a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================