ci2 starts bisection 2026-11-07 23:12:29.1041772 +0000 UTC m=+184745.369065533 bisecting fixing commit since 31c263582f4e2d320dc8c8cfceb8674226afbadd building syzkaller on 7f27c57affd8bddc0f76bd42d53ecfc583fc548b ensuring issue is reproducible on original commit 31c263582f4e2d320dc8c8cfceb8674226afbadd testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 7c1db9470861e406a6fbc538fab6fd1e40aa7acbed2b530f466782207002b633 run #0: crashed: KASAN: use-after-free Read in xattr_find_entry run #1: crashed: KASAN: use-after-free Read in xattr_find_entry run #2: crashed: KASAN: use-after-free Read in xattr_find_entry run #3: crashed: KASAN: use-after-free Read in xattr_find_entry run #4: crashed: KASAN: use-after-free Read in xattr_find_entry run #5: crashed: KASAN: use-after-free Read in xattr_find_entry run #6: crashed: KASAN: use-after-free Read in xattr_find_entry run #7: crashed: KASAN: use-after-free Read in xattr_find_entry run #8: crashed: KASAN: use-after-free Read in xattr_find_entry run #9: crashed: KASAN: use-after-free Read in xattr_find_entry run #10: crashed: KASAN: use-after-free Read in xattr_find_entry run #11: crashed: KASAN: use-after-free Read in xattr_find_entry run #12: crashed: KASAN: use-after-free Read in xattr_find_entry run #13: crashed: KASAN: use-after-free Read in xattr_find_entry run #14: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #15: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #16: crashed: KASAN: use-after-free Read in xattr_find_entry run #17: crashed: KASAN: use-after-free Read in xattr_find_entry run #18: crashed: KASAN: use-after-free Read in xattr_find_entry run #19: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] check whether we can drop unnecessary instrumentation disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: b90ffada06d08547b8c49e457badf6cced0f00052c0b9fb51ad42ed7fd99209b run #0: crashed: KASAN: use-after-free Read in xattr_find_entry run #1: crashed: KASAN: use-after-free Read in xattr_find_entry run #2: crashed: KASAN: use-after-free Read in xattr_find_entry run #3: crashed: KASAN: use-after-free Read in xattr_find_entry run #4: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #5: crashed: KASAN: use-after-free Read in xattr_find_entry run #6: crashed: KASAN: use-after-free Read in xattr_find_entry run #7: crashed: KASAN: use-after-free Read in xattr_find_entry run #8: crashed: KASAN: use-after-free Read in xattr_find_entry run #9: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, 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=4925 full=6218 leaves diff=255 split chunks (needed=false): <255> split chunk #0 of len 255 into 5 parts testing without sub-chunk 1/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f9169f2ac9ea91dd3a798d3a6af5ddba75fa7f5110a1f6bf4cf943989956765a all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ubsan bug_or_warning locking atomic_sleep hang memleak], they are not needed testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: fd33ebd626769dafc6cb05be62b3efc40c84fe04f33e6abe9ffe8ea9730bbb45 all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 84219b16be2803cfcbdba27a5f229d092d8652e6c8a87490ad55adbd02c062a6 run #0: crashed: KASAN: use-after-free Read in xattr_find_entry run #1: crashed: KASAN: use-after-free Read in xattr_find_entry run #2: crashed: KASAN: use-after-free Read in xattr_find_entry run #3: crashed: KASAN: use-after-free Read in xattr_find_entry run #4: crashed: KASAN: use-after-free Read in xattr_find_entry run #5: crashed: KASAN: use-after-free Read in xattr_find_entry run #6: crashed: KASAN: slab-out-of-bounds Read in xattr_find_entry run #7: crashed: KASAN: use-after-free Read in xattr_find_entry run #8: crashed: KASAN: use-after-free Read in xattr_find_entry run #9: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f814568004f69463352ad7921ab7c1b3b4e9d4815686393e558099ecb0e3a684 all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 31c263582f4e2d320dc8c8cfceb8674226afbadd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 31c263582f4e2d320dc8c8cfceb8674226afbadd: net/socket.c:1189:(.text+0x6dea): undefined reference to `wext_handle_ioctl' net/socket.c:3390:(.text+0x73e4): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:343:(.text+0x33b): undefined reference to `wext_proc_exit' net/core/net-procfs.c:327:(.text+0x4e2): undefined reference to `wext_proc_init' minimized to 51 configs; suspects: [HID_ZEROPLUS 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 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing current HEAD 2316d138a3c3f2ec12cfb4b2f09ca9c95aa92ce5 testing commit 2316d138a3c3f2ec12cfb4b2f09ca9c95aa92ce5 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a5996ea8a4591505eab0d330f611f64833ee622ed55a18372e70690cc9a4e64a all runs: crashed: KASAN: use-after-free Read in xattr_find_entry representative crash: KASAN: use-after-free Read in xattr_find_entry, types: [KASAN-USE-AFTER-FREE-READ] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h26m26.08947953s (build: 26m56.506100205s, test: 50m11.457047868s) crash still not fixed or there were kernel test errors commit msg: Merge 5.15.223 into android13-5.15-lts crash: KASAN: use-after-free Read in xattr_find_entry EXT4-fs (loop2): mounted filesystem without journal. Opts: block_validity,errors=remount-ro,sysvgroups,norecovery,debug_want_extra_isize=0x0000000000000080,grpjquota=,nogrpid,noauto_da_alloc,norecovery,. Quota mode: none. ================================================================== BUG: KASAN: use-after-free in xattr_find_entry+0x237/0x260 fs/ext4/xattr.c:294 Read of size 4 at addr ffff88811b3e8004 by task syz.2.18/459 CPU: 1 PID: 459 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x38/0x49 lib/dump_stack.c:106 print_address_description.constprop.0+0x24/0x160 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report.cold+0x82/0xdb mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 xattr_find_entry+0x237/0x260 fs/ext4/xattr.c:294 ext4_xattr_ibody_get+0x241/0x500 fs/ext4/xattr.c:601 ext4_xattr_get+0x149/0xa00 fs/ext4/xattr.c:655 ext4_get_acl+0x4a/0x590 fs/ext4/acl.c:165 get_acl.part.0+0xb0/0x1d0 fs/posix_acl.c:153 get_acl fs/posix_acl.c:124 [inline] posix_acl_chmod fs/posix_acl.c:602 [inline] posix_acl_chmod+0x187/0x360 fs/posix_acl.c:591 ext4_setattr+0x642/0x2180 fs/ext4/inode.c:5672 notify_change+0x4b4/0xeb0 fs/attr.c:505 chmod_common+0x214/0x470 fs/open.c:583 do_fchmodat+0xa4/0x110 fs/open.c:622 __do_sys_fchmodat fs/open.c:635 [inline] __se_sys_fchmodat fs/open.c:632 [inline] __x64_sys_fchmodat+0x71/0xb0 fs/open.c:632 x64_sys_call+0x29e/0x990 arch/x86/include/generated/asm/syscalls_64.h:269 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7eff4da07e99 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:00007eff4d869028 EFLAGS: 00000246 ORIG_RAX: 000000000000010c RAX: ffffffffffffffda RBX: 00007eff4dc8ffa0 RCX: 00007eff4da07e99 RDX: 00000000ffffff50 RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007eff4da9deaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007eff4dc90038 R14: 00007eff4dc8ffa0 R15: 00007ffc7e81dd08 Allocated by task 0: 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:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] ____kasan_kmalloc mm/kasan/common.c:471 [inline] __kasan_kmalloc+0xae/0xe0 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc_track_caller+0x2d9/0x540 mm/slub.c:4959 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x8b/0x250 net/core/skbuff.c:428 __napi_alloc_skb+0x48/0x2b0 net/core/skbuff.c:569 napi_alloc_skb include/linux/skbuff.h:3102 [inline] page_to_skb+0x41a/0xa80 drivers/net/virtio_net.c:474 receive_mergeable drivers/net/virtio_net.c:1102 [inline] receive_buf+0x21f8/0x4b10 drivers/net/virtio_net.c:1212 virtnet_receive drivers/net/virtio_net.c:1504 [inline] virtnet_poll+0x554/0x1260 drivers/net/virtio_net.c:1620 __napi_poll+0xa4/0x440 net/core/dev.c:7110 napi_poll net/core/dev.c:7177 [inline] net_rx_action+0x2f3/0xb00 net/core/dev.c:7267 handle_softirqs+0x1c5/0x510 kernel/softirq.c:583 __do_softirq kernel/softirq.c:621 [inline] invoke_softirq kernel/softirq.c:443 [inline] __irq_exit_rcu kernel/softirq.c:670 [inline] irq_exit_rcu+0x66/0x110 kernel/softirq.c:682 common_interrupt+0xc2/0xe0 arch/x86/kernel/irq.c:242 asm_common_interrupt+0x27/0x40 arch/x86/include/asm/idtentry.h:667 Freed by task 267: 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:365 [inline] ____kasan_slab_free mm/kasan/common.c:327 [inline] __kasan_slab_free+0x111/0x150 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x94/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc2/0x2a0 mm/slub.c:4588 skb_free_head+0xb8/0x110 net/core/skbuff.c:656 skb_release_data+0x3dc/0x520 net/core/skbuff.c:678 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb+0x40/0x60 net/core/skbuff.c:757 sk_eat_skb include/net/sock.h:2800 [inline] tcp_recvmsg_locked+0x1000/0x2230 net/ipv4/tcp.c:2520 tcp_recvmsg+0x117/0x470 net/ipv4/tcp.c:2566 inet_recvmsg+0xf7/0x4c0 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:967 [inline] sock_recvmsg net/socket.c:985 [inline] sock_recvmsg net/socket.c:981 [inline] sock_read_iter+0x2da/0x510 net/socket.c:1058 call_read_iter include/linux/fs.h:2212 [inline] new_sync_read+0x489/0x6d0 fs/read_write.c:404 vfs_read+0x34a/0x4b0 fs/read_write.c:485 ksys_read+0x192/0x210 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x6e/0xb0 fs/read_write.c:631 x64_sys_call+0x982/0x990 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88811b3e8000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 4 bytes inside of 1024-byte region [ffff88811b3e8000, ffff88811b3e8400) The buggy address belongs to the page: page:ffffea00046cfa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b3e8 head:ffffea00046cfa00 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 267, ts 19715756330, free_ts 19715735216 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook mm/page_alloc.c:2610 [inline] prep_new_page+0x1a2/0x310 mm/page_alloc.c:2616 get_page_from_freelist+0x1da1/0x3180 mm/page_alloc.c:4492 __alloc_pages+0x300/0x2d60 mm/page_alloc.c:5829 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] alloc_slab_page mm/slub.c:1798 [inline] allocate_slab+0x39d/0x530 mm/slub.c:1937 new_slab mm/slub.c:2000 [inline] ___slab_alloc.constprop.0+0x3ca/0x890 mm/slub.c:3033 __slab_alloc.constprop.0+0x42/0x80 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x501/0x540 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x8b/0x250 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] __tcp_send_ack.part.0+0x63/0x5f0 net/ipv4/tcp_output.c:4000 __tcp_send_ack net/ipv4/tcp_output.c:4032 [inline] tcp_send_ack+0x6f/0x90 net/ipv4/tcp_output.c:4032 tcp_cleanup_rbuf+0x195/0x340 net/ipv4/tcp.c:1600 tcp_recvmsg_locked+0x592/0x2230 net/ipv4/tcp.c:2536 tcp_recvmsg+0x117/0x470 net/ipv4/tcp.c:2566 inet_recvmsg+0xf7/0x4c0 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:967 [inline] sock_recvmsg net/socket.c:985 [inline] sock_recvmsg net/socket.c:981 [inline] sock_read_iter+0x2da/0x510 net/socket.c:1058 call_read_iter include/linux/fs.h:2212 [inline] new_sync_read+0x489/0x6d0 fs/read_write.c:404 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1477 [inline] free_pcp_prepare+0x263/0x660 mm/page_alloc.c:1549 free_unref_page_prepare mm/page_alloc.c:3540 [inline] free_unref_page+0x84/0x760 mm/page_alloc.c:3622 free_the_page mm/page_alloc.c:808 [inline] free_compound_page+0x91/0xb0 mm/page_alloc.c:831 destroy_compound_page include/linux/mm.h:1000 [inline] __put_compound_page mm/swap.c:111 [inline] __put_page+0x91/0x110 mm/swap.c:127 put_page include/linux/mm.h:1306 [inline] __skb_frag_unref include/linux/skbuff.h:3275 [inline] skb_release_data+0x39d/0x520 net/core/skbuff.c:673 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb+0x40/0x60 net/core/skbuff.c:757 sk_eat_skb include/net/sock.h:2800 [inline] tcp_recvmsg_locked+0x1000/0x2230 net/ipv4/tcp.c:2520 tcp_recvmsg+0x117/0x470 net/ipv4/tcp.c:2566 inet_recvmsg+0xf7/0x4c0 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:967 [inline] sock_recvmsg net/socket.c:985 [inline] sock_recvmsg net/socket.c:981 [inline] sock_read_iter+0x2da/0x510 net/socket.c:1058 call_read_iter include/linux/fs.h:2212 [inline] new_sync_read+0x489/0x6d0 fs/read_write.c:404 vfs_read+0x34a/0x4b0 fs/read_write.c:485 ksys_read+0x192/0x210 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x6e/0xb0 fs/read_write.c:631 x64_sys_call+0x982/0x990 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88811b3e7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811b3e7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811b3e8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811b3e8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811b3e8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop2): xattr_find_entry:297: inode #12: comm syz.2.18: corrupted xattr entries EXT4-fs (loop2): Remounting filesystem read-only