name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 32200 Comm: syz.7.8760 Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xf6/0x150 lib/dump_stack.c:120 ================================================================== BUG: KCSAN: data-race in desc_read_finalized_seq / prb_reserve write to 0xffffffff868b6668 of 8 bytes by task 32176 on cpu 0: prb_reserve+0x750/0xb80 kernel/printk/printk_ringbuffer.c:-1 vprintk_store+0x552/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 __ext4_error_inode+0x2e7/0x410 fs/ext4/super.c:848 __ext4_mark_inode_dirty+0xc3/0x440 fs/ext4/inode.c:6060 ext4_evict_inode+0x82d/0xdf0 fs/ext4/inode.c:257 evict+0x2de/0x550 fs/inode.c:810 iput_final fs/inode.c:1898 [inline] iput+0x42a/0x5b0 fs/inode.c:1924 ext4_process_orphan+0x1a9/0x1c0 fs/ext4/orphan.c:360 ext4_orphan_cleanup+0x69c/0x9f0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5607 [inline] ext4_fill_super+0x3215/0x3580 fs/ext4/super.c:5726 get_tree_bdev_flags+0x2b4/0x330 fs/super.c:1636 get_tree_bdev+0x1f/0x30 fs/super.c:1659 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5758 vfs_get_tree+0x56/0x1e0 fs/super.c:1759 do_new_mount+0x246/0x6b0 fs/namespace.c:3878 path_mount+0x49b/0xb30 fs/namespace.c:4205 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4406 __x64_sys_mount+0x67/0x80 fs/namespace.c:4406 x64_sys_call+0xd11/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868b6668 of 8 bytes by task 32200 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:486 [inline] desc_read_finalized_seq+0x163/0x280 kernel/printk/printk_ringbuffer.c:1874 prb_read kernel/printk/printk_ringbuffer.c:1922 [inline] _prb_read_valid+0x142/0x710 kernel/printk/printk_ringbuffer.c:2113 desc_update_last_finalized kernel/printk/printk_ringbuffer.c:1515 [inline] prb_final_commit+0x147/0x200 kernel/printk/printk_ringbuffer.c:1782 vprintk_store+0x737/0x860 kernel/printk/printk.c:2352 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline] show_trace_log_lvl+0x382/0x410 arch/x86/kernel/dumpstack.c:285 __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xf6/0x150 lib/dump_stack.c:120 dump_stack+0x15/0x1a lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x261/0x270 lib/fault-inject.c:174 should_failslab+0x8f/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4091 [inline] slab_alloc_node mm/slub.c:4167 [inline] kmem_cache_alloc_node_noprof+0x5c/0x340 mm/slub.c:4239 __alloc_skb+0x10d/0x320 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1340 [inline] netlink_alloc_large_skb+0xad/0xe0 net/netlink/af_netlink.c:1187 netlink_sendmsg+0x3da/0x720 net/netlink/af_netlink.c:1858 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:727 ____sys_sendmsg+0x350/0x4e0 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x1a0/0x240 net/socket.c:2652 __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2655 x64_sys_call+0x26f3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000002599 -> 0x0000000000004599 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 32200 Comm: syz.7.8760 Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== dump_stack+0x15/0x1a lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x261/0x270 lib/fault-inject.c:174 should_failslab+0x8f/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4091 [inline] slab_alloc_node mm/slub.c:4167 [inline] kmem_cache_alloc_node_noprof+0x5c/0x340 mm/slub.c:4239 __alloc_skb+0x10d/0x320 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1340 [inline] netlink_alloc_large_skb+0xad/0xe0 net/netlink/af_netlink.c:1187 netlink_sendmsg+0x3da/0x720 net/netlink/af_netlink.c:1858 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:727 ____sys_sendmsg+0x350/0x4e0 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x1a0/0x240 net/socket.c:2652 __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2655 x64_sys_call+0x26f3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3cea2fd169 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:00007f3ce895f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3cea515fa0 RCX: 00007f3cea2fd169 RDX: 0000000000000000 RSI: 0000200000001540 RDI: 0000000000000004 RBP: 00007f3ce895f090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f3cea515fa0 R15: 00007fff58fbd798