EXT4-fs error (device loop1): ext4_get_journal_inode:5762: inode #5: comm syz.1.16103: unexpected bad inode w/o EXT4_IGET_BAD
EXT4-fs (loop1): no journal found
==================================================================
BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff88bbe5bb of 1 bytes by task 14496 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 string+0x16c/0x210 lib/vsprintf.c:728
 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2803
 vscnprintf+0x42/0x90 lib/vsprintf.c:2909
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2197
 vprintk_store+0x570/0x810 kernel/printk/printk.c:2311
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68
 _printk+0x7a/0xa0 kernel/printk/printk.c:2432
 chnl_flowctrl_cb+0x1fa/0x490 net/caif/chnl_net.c:151
 caif_disconnect_client+0xe7/0x150 net/caif/cfcnfg.c:199
 chnl_net_open+0x4ff/0x5a0 net/caif/chnl_net.c:326
 __dev_open+0x1f7/0x2e0 net/core/dev.c:1476
 __dev_change_flags+0x155/0x410 net/core/dev.c:8841
 dev_change_flags+0x59/0xd0 net/core/dev.c:8913
 do_setlink+0x844/0x2490 net/core/rtnetlink.c:2929
 rtnl_setlink+0x255/0x300 net/core/rtnetlink.c:3230
 rtnetlink_rcv_msg+0x6aa/0x710 net/core/rtnetlink.c:6675
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2551
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6693
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:744
 sock_write_iter+0x15e/0x1a0 net/socket.c:1165
 do_iter_readv_writev+0x394/0x450
 vfs_writev+0x2d4/0x880 fs/read_write.c:1064
 do_writev+0xf8/0x220 fs/read_write.c:1111
 __do_sys_writev fs/read_write.c:1184 [inline]
 __se_sys_writev fs/read_write.c:1181 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1181
 x64_sys_call+0x1f18/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:21
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88bbe5b8 of 8 bytes by task 14494 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2301
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68
 _printk+0x7a/0xa0 kernel/printk/printk.c:2432
 __ext4_msg+0x18e/0x1a0 fs/ext4/super.c:991
 ext4_get_journal_inode+0x52/0x140 fs/ext4/super.c:5764
 ext4_calculate_overhead+0x871/0x990 fs/ext4/super.c:4206
 __ext4_fill_super fs/ext4/super.c:5436 [inline]
 ext4_fill_super+0x2f57/0x3a10 fs/ext4/super.c:5686
 get_tree_bdev+0x256/0x2e0 fs/super.c:1635
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5718
 vfs_get_tree+0x56/0x1e0 fs/super.c:1800
 do_new_mount+0x227/0x690 fs/namespace.c:3507
 path_mount+0x49b/0xb30 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4032
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4032
 x64_sys_call+0x203e/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000100007a10 -> 0x6c665f6c6e68633a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14494 Comm: syz.1.16103 Tainted: G        W          6.12.0-rc3-syzkaller-00389-g3d5ad2d4eca3 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================
EXT4-fs (loop1): can't get journal size
EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 ro without journal. Quota mode: writeback.