BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6800
caller is ext4_mb_new_blocks+0x301/0x1620 fs/ext4/mballoc.c:4711
CPU: 1 PID: 6800 Comm: syz-fuzzer Not tainted 5.8.0-rc1-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+0x1f0/0x31e lib/dump_stack.c:118
 check_preemption_disabled+0x1c9/0x240 lib/smp_processor_id.c:48
 ext4_mb_new_blocks+0x301/0x1620 fs/ext4/mballoc.c:4711
 ext4_ext_map_blocks+0x2ad5/0x6d20 fs/ext4/extents.c:4244
 ext4_map_blocks+0x8c1/0x19e0 fs/ext4/inode.c:626
 ext4_getblk+0xa4/0x460 fs/ext4/inode.c:833
 ext4_bread+0x48/0x330 fs/ext4/inode.c:883
 ext4_append+0x153/0x2d0 fs/ext4/namei.c:67
 ext4_init_new_dir fs/ext4/namei.c:2757 [inline]
 ext4_mkdir+0x75f/0x14c0 fs/ext4/namei.c:2802
 vfs_mkdir+0x42a/0x620 fs/namei.c:3641
 do_mkdirat+0x1b9/0x310 fs/namei.c:3664
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4b02a0
Code: Bad RIP value.
RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 000000c00002e500 RCX: 00000000004b02a0
RDX: 00000000000001c0 RSI: 000000c0000dea80 RDI: ffffffffffffff9c
RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
R13: 0000000000000055 R14: 0000000000000054 R15: 0000000000000100