==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
BUG: KASAN: slab-out-of-bounds in ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:946
Read of size 4 at addr ffff88812a4b1f18 by task kworker/u4:6/712
CPU: 1 PID: 712 Comm: kworker/u4:6 Tainted: G W 5.15.189-syzkaller-00091-gf32b52534f1d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-7:6)
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0xf1/0x140 mm/kasan/report.c:444
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:946
ext4_ext_map_blocks+0x1de/0x6280 fs/ext4/extents.c:4166
ext4_map_blocks+0x97b/0x1b20 fs/ext4/inode.c:674
mpage_map_one_extent fs/ext4/inode.c:2421 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline]
ext4_writepages+0x11e7/0x2f90 fs/ext4/inode.c:2842
do_writepages+0x48a/0x6c0 mm/page-writeback.c:2388
__writeback_single_inode+0xd5/0x9c0 fs/fs-writeback.c:1647
writeback_sb_inodes+0x9c0/0x1590 fs/fs-writeback.c:1930
wb_writeback+0x3f1/0x980 fs/fs-writeback.c:2106
wb_do_writeback fs/fs-writeback.c:2253 [inline]
wb_workfn+0x38f/0xe20 fs/fs-writeback.c:2294
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Allocated by task 4807:
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:433 [inline]
__kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
slab_alloc_node mm/slub.c:3240 [inline]
slab_alloc mm/slub.c:3250 [inline]
kmem_cache_alloc+0xf7/0x260 mm/slub.c:3255
kmem_cache_alloc_node include/linux/slab.h:489 [inline]
__alloc_skb+0xe0/0x740 net/core/skbuff.c:416
alloc_skb include/linux/skbuff.h:1183 [inline]
nlmsg_new include/net/netlink.h:953 [inline]
__neigh_notify+0x84/0x130 net/core/neighbour.c:3379
neigh_cleanup_and_release+0x2c/0x1a0 net/core/neighbour.c:101
neigh_flush_dev+0x6af/0x840 net/core/neighbour.c:374
neigh_changeaddr+0x30/0x40 net/core/neighbour.c:382
ndisc_netdev_event+0x219/0x3e0 net/ipv6/ndisc.c:1832
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391
call_netdevice_notifiers_info net/core/dev.c:2057 [inline]
__dev_notify_flags+0x3c3/0x500 net/core/dev.c:8913
dev_change_flags+0xe8/0x1a0 net/core/dev.c:8937
do_setlink+0xbed/0x3990 net/core/rtnetlink.c:2779
rtnl_group_changelink net/core/rtnetlink.c:3296 [inline]
__rtnl_newlink net/core/rtnetlink.c:3460 [inline]
rtnl_newlink+0xd6b/0x17b0 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x9e4/0xb90 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2511
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1922
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
__sys_sendmsg net/socket.c:2519 [inline]
__do_sys_sendmsg net/socket.c:2528 [inline]
__se_sys_sendmsg net/socket.c:2526 [inline]
__x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526
x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 4807:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1749
slab_free mm/slub.c:3521 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3539
kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1
__kfree_skb net/core/skbuff.c:758 [inline]
consume_skb+0xb3/0x1f0 net/core/skbuff.c:930
netlink_broadcast_filtered+0x113a/0x1230 net/netlink/af_netlink.c:1538
netlink_broadcast net/netlink/af_netlink.c:1560 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xed/0x1b0 net/netlink/af_netlink.c:2554
rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:759
__neigh_notify+0xd3/0x130 net/core/neighbour.c:3390
neigh_cleanup_and_release+0x2c/0x1a0 net/core/neighbour.c:101
neigh_flush_dev+0x6af/0x840 net/core/neighbour.c:374
neigh_changeaddr+0x30/0x40 net/core/neighbour.c:382
ndisc_netdev_event+0x219/0x3e0 net/ipv6/ndisc.c:1832
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391
call_netdevice_notifiers_info net/core/dev.c:2057 [inline]
__dev_notify_flags+0x3c3/0x500 net/core/dev.c:8913
dev_change_flags+0xe8/0x1a0 net/core/dev.c:8937
do_setlink+0xbed/0x3990 net/core/rtnetlink.c:2779
rtnl_group_changelink net/core/rtnetlink.c:3296 [inline]
__rtnl_newlink net/core/rtnetlink.c:3460 [inline]
rtnl_newlink+0xd6b/0x17b0 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x9e4/0xb90 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2511
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1922
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
__sys_sendmsg net/socket.c:2519 [inline]
__do_sys_sendmsg net/socket.c:2528 [inline]
__se_sys_sendmsg net/socket.c:2526 [inline]
__x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526
x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff88812a4b1dc0
which belongs to the cache skbuff_head_cache of size 248
The buggy address is located 96 bytes to the right of
248-byte region [ffff88812a4b1dc0, ffff88812a4b1eb8)
The buggy address belongs to the page:
page:ffffea0004a92c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88812a4b1640 pfn:0x12a4b1
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea000452df08 ffffea0004493e88 ffff8881081aa600
raw: ffff88812a4b1640 00000000000c0007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 3601, ts 80509660245, free_ts 80387132014
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
__alloc_pages+0x18f/0x440 mm/page_alloc.c:5795
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1932 [inline]
new_slab+0xa1/0x4d0 mm/slub.c:1995
___slab_alloc+0x381/0x810 mm/slub.c:3028
__slab_alloc+0x49/0x90 mm/slub.c:3115
slab_alloc_node mm/slub.c:3206 [inline]
slab_alloc mm/slub.c:3250 [inline]
kmem_cache_alloc+0x138/0x260 mm/slub.c:3255
skb_clone+0x1cf/0x360 net/core/skbuff.c:1547
____bpf_clone_redirect net/core/filter.c:2438 [inline]
bpf_clone_redirect+0xa7/0x380 net/core/filter.c:2423
0xffffffffa003814e
bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
bpf_test_run+0x33d/0x8d0 net/bpf/test_run.c:119
bpf_prog_test_run_skb+0x9ec/0x1150 net/bpf/test_run.c:669
bpf_prog_test_run+0x3d5/0x620 kernel/bpf/syscall.c:3348
__sys_bpf+0x52c/0x730 kernel/bpf/syscall.c:4651
__do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1472 [inline]
free_pcp_prepare mm/page_alloc.c:1544 [inline]
free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534
free_unref_page_list+0x134/0x9d0 mm/page_alloc.c:3671
release_pages+0xfda/0x1030 mm/swap.c:1014
free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320
tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
tlb_flush_mmu mm/mmu_gather.c:247 [inline]
tlb_finish_mmu+0x175/0x300 mm/mmu_gather.c:338
exit_mmap+0x40f/0x860 mm/mmap.c:3244
__mmput+0x93/0x320 kernel/fork.c:1180
mmput+0x50/0x150 kernel/fork.c:1203
exit_mm kernel/exit.c:554 [inline]
do_exit+0x9d2/0x27a0 kernel/exit.c:876
do_group_exit+0x141/0x310 kernel/exit.c:1003
get_signal+0x66a/0x1480 kernel/signal.c:2907
arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
Memory state around the buggy address:
ffff88812a4b1e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88812a4b1e80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
>ffff88812a4b1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88812a4b1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88812a4b2000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2433!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 712 Comm: kworker/u4:6 Tainted: G B W 5.15.189-syzkaller-00091-gf32b52534f1d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-7:6)
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2433 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline]
RIP: 0010:ext4_writepages+0x2eed/0x2f90 fs/ext4/inode.c:2842
Code: 00 74 08 48 89 df e8 22 01 ce ff 48 8b 3b 48 8b 74 24 28 48 8b 54 24 30 44 89 e9 45 89 f0 e8 6a 9b 07 00 eb 51 e8 23 86 8f ff <0f> 0b e8 1c 86 8f ff eb 2f e8 15 86 8f ff eb 5f e8 0e 86 8f ff 31
RSP: 0018:ffffc90000b07100 EFLAGS: 00010293
RAX: ffffffff81d929ad RBX: ffff88810cc19e90 RCX: ffff88811da2cf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b07470 R08: dffffc0000000000 R09: ffffed10219833cb
R10: ffffed10219833cb R11: 1ffff110219833ca R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8ee94cc000 CR3: 0000000126678000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_writepages+0x48a/0x6c0 mm/page-writeback.c:2388
__writeback_single_inode+0xd5/0x9c0 fs/fs-writeback.c:1647
writeback_sb_inodes+0x9c0/0x1590 fs/fs-writeback.c:1930
wb_writeback+0x3f1/0x980 fs/fs-writeback.c:2106
wb_do_writeback fs/fs-writeback.c:2253 [inline]
wb_workfn+0x38f/0xe20 fs/fs-writeback.c:2294
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Modules linked in:
---[ end trace cc4b1053c46b188d ]---
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2433 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline]
RIP: 0010:ext4_writepages+0x2eed/0x2f90 fs/ext4/inode.c:2842
Code: 00 74 08 48 89 df e8 22 01 ce ff 48 8b 3b 48 8b 74 24 28 48 8b 54 24 30 44 89 e9 45 89 f0 e8 6a 9b 07 00 eb 51 e8 23 86 8f ff <0f> 0b e8 1c 86 8f ff eb 2f e8 15 86 8f ff eb 5f e8 0e 86 8f ff 31
RSP: 0018:ffffc90000b07100 EFLAGS: 00010293
RAX: ffffffff81d929ad RBX: ffff88810cc19e90 RCX: ffff88811da2cf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b07470 R08: dffffc0000000000 R09: ffffed10219833cb
R10: ffffed10219833cb R11: 1ffff110219833ca R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4b6c8ff8 CR3: 000000011cea4000 CR4: 00000000003506a0