BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6449 caller is ext4_mb_new_blocks+0x361/0x1010 fs/ext4/mballoc.c:4711 CPU: 0 PID: 6449 Comm: syz-fuzzer Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xbb/0xe3 lib/dump_stack.c:118 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold+0x53/0x67 lib/smp_processor_id.c:57 ext4_mb_new_blocks+0x361/0x1010 fs/ext4/mballoc.c:4711 ext4_ext_map_blocks+0xbbc/0x11e0 fs/ext4/extents.c:4244 ext4_map_blocks+0x128/0x7b0 fs/ext4/inode.c:626 ext4_getblk+0x5f/0x270 fs/ext4/inode.c:833 ext4_bread+0x3d/0x140 fs/ext4/inode.c:883 ext4_append+0x5a/0x110 fs/ext4/namei.c:67 ext4_init_new_dir fs/ext4/namei.c:2757 [inline] ext4_mkdir+0x294/0x570 fs/ext4/namei.c:2802 vfs_mkdir+0x136/0x230 fs/namei.c:3641 do_mkdirat+0x11a/0x160 fs/namei.c:3664 do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4b02a0 Code: Bad RIP value. RSP: 002b:000000c0000dd4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 000000c00002e500 RCX: 00000000004b02a0 RDX: 00000000000001c0 RSI: 000000c00009eee0 RDI: ffffffffffffff9c RBP: 000000c0000dd510 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff R13: 0000000000000078 R14: 0000000000000077 R15: 0000000000000100