syz.2.2226 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=1000 CPU: 0 UID: 0 PID: 9789 Comm: syz.2.2226 Not tainted 6.16.0-rc3-syzkaller-00057-g92ca6c498a5e #0 PREEMPT(voluntary) ================================================================== BUG: KCSAN: data-race in data_push_tail / vsnprintf write to 0xffffffff88e3b26a of 45 bytes by task 9812 on cpu 1: vsnprintf+0x2ce/0x890 lib/vsprintf.c:2826 va_format lib/vsprintf.c:1715 [inline] pointer+0x833/0xcf0 lib/vsprintf.c:2496 vsnprintf+0x491/0x890 lib/vsprintf.c:2878 vscnprintf+0x41/0x90 lib/vsprintf.c:2939 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216 vprintk_store+0x599/0x860 kernel/printk/printk.c:2336 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 __ext4_grp_locked_error+0x599/0x780 fs/ext4/super.c:1054 ext4_mb_generate_buddy+0x243/0x2c0 fs/ext4/mballoc.c:1217 ext4_mb_init_cache+0x82b/0xb70 fs/ext4/mballoc.c:1406 ext4_mb_init_group+0x25b/0x3f0 fs/ext4/mballoc.c:1543 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2704 [inline] ext4_mb_regular_allocator+0xb1a/0x2300 fs/ext4/mballoc.c:2903 ext4_mb_new_blocks+0x800/0x2050 fs/ext4/mballoc.c:6215 ext4_ext_map_blocks+0xff5/0x38a0 fs/ext4/extents.c:4383 ext4_map_create_blocks fs/ext4/inode.c:609 [inline] ext4_map_blocks+0x61c/0xd70 fs/ext4/inode.c:813 mpage_map_one_extent fs/ext4/inode.c:2348 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2401 [inline] ext4_do_writepages+0x12d5/0x21c0 fs/ext4/inode.c:2863 ext4_writepages+0x176/0x300 fs/ext4/inode.c:2953 do_writepages+0x1c3/0x310 mm/page-writeback.c:2636 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] file_write_and_wait_range+0x156/0x2c0 mm/filemap.c:794 generic_buffers_fsync_noflush+0x45/0x120 fs/buffer.c:609 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x1ab/0x690 fs/ext4/fsync.c:147 vfs_fsync_range+0x10a/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:3031 [inline] ext4_buffered_write_iter+0x34f/0x3c0 fs/ext4/file.c:305 ext4_file_write_iter+0x383/0xf00 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x49d/0x8e0 fs/read_write.c:686 ksys_pwrite64 fs/read_write.c:793 [inline] __do_sys_pwrite64 fs/read_write.c:801 [inline] __se_sys_pwrite64 fs/read_write.c:798 [inline] __x64_sys_pwrite64+0xfd/0x150 fs/read_write.c:798 x64_sys_call+0xe45/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:19 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff88e3b288 of 8 bytes by task 9789 on cpu 0: data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline] data_push_tail+0xfd/0x420 kernel/printk/printk_ringbuffer.c:679 data_alloc+0xbf/0x2b0 kernel/printk/printk_ringbuffer.c:1054 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 dump_stack_print_info+0xee/0x1b0 lib/dump_stack.c:57 __dump_stack+0x11/0x30 lib/dump_stack.c:93 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x81/0x220 mm/oom_kill.c:467 oom_kill_process+0x334/0x3f0 mm/oom_kill.c:1040 out_of_memory+0x979/0xb80 mm/oom_kill.c:1178 mem_cgroup_out_of_memory mm/memcontrol.c:1654 [inline] mem_cgroup_oom mm/memcontrol.c:1677 [inline] try_charge_memcg+0x5e6/0x9e0 mm/memcontrol.c:2404 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2803 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2847 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:4976 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2419 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline] alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2510 vm_area_alloc_pages mm/vmalloc.c:3634 [inline] __vmalloc_area_node mm/vmalloc.c:3712 [inline] __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3885 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5037 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0x3c9/0x960 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x4c3/0x590 net/netfilter/nfnetlink.c:303 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2534 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:668 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x59e/0x670 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x142/0x180 net/socket.c:727 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655 x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffff10d -> 0x747369736e6f636e Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 9789 Comm: syz.2.2226 Not tainted 6.16.0-rc3-syzkaller-00057-g92ca6c498a5e #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x81/0x220 mm/oom_kill.c:467 oom_kill_process+0x334/0x3f0 mm/oom_kill.c:1040 out_of_memory+0x979/0xb80 mm/oom_kill.c:1178 mem_cgroup_out_of_memory mm/memcontrol.c:1654 [inline] mem_cgroup_oom mm/memcontrol.c:1677 [inline] try_charge_memcg+0x5e6/0x9e0 mm/memcontrol.c:2404 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2803 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2847 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:4976 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2419 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline] alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2510 vm_area_alloc_pages mm/vmalloc.c:3634 [inline] __vmalloc_area_node mm/vmalloc.c:3712 [inline] __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3885 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5037 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0x3c9/0x960 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x4c3/0x590 net/netfilter/nfnetlink.c:303 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2534 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:668 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x59e/0x670 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x142/0x180 net/socket.c:727 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655 x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb0b88ce929 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:00007fb0b6f37038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb0b8af5fa0 RCX: 00007fb0b88ce929 RDX: 0000000000000800 RSI: 0000200000000040 RDI: 0000000000000006 RBP: 00007fb0b8950b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb0b8af5fa0 R15: 00007fffa6342948 memory: usage 307200kB, limit 307200kB, failcnt 596 memory+swap: usage 307384kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307164kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz2: cache 4096 rss 16384 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 519 workingset_refault_file 505 swap 200704 swapcached 12288 pgpgin 171325 pgpgout 171319 pgfault 190351 pgmajfault 189 inactive_anon 8192 active_anon 8192 inactive_file 0 active_file 8192 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 4096 total_rss 16384 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 519 total_workingset_refault_file 505 total_swap 200704 total_swapcached 12288 total_pgpgin 171325 total_pgpgout 171319 total_pgfault 190351 total_pgmajfault 189 total_inactive_anon 8192 total_active_anon 8192 total_inactive_file 0 total_active_file 8192 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz2,task_memcg=/syz2,task=syz.2.2226,pid=9788,uid=0 Memory cgroup out of memory: Killed process 9788 (syz.2.2226) total-vm:93752kB, anon-rss:1056kB, file-rss:22472kB, shmem-rss:0kB, UID:0 pgtables:124kB oom_score_adj:1000