BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/9114
caller is ext4_mb_new_blocks+0xa77/0x3b30 fs/ext4/mballoc.c:4711
CPU: 2 PID: 9114 Comm: syz-fuzzer Not tainted 5.7.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 check_preemption_disabled lib/smp_processor_id.c:47 [inline]
 debug_smp_processor_id.cold+0x88/0x9b lib/smp_processor_id.c:57
 ext4_mb_new_blocks+0xa77/0x3b30 fs/ext4/mballoc.c:4711
 ext4_ext_map_blocks+0x2044/0x3410 fs/ext4/extents.c:4244
 ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
 ext4_getblk+0xad/0x520 fs/ext4/inode.c:833
 ext4_bread+0x7c/0x380 fs/ext4/inode.c:883
 ext4_append+0x153/0x360 fs/ext4/namei.c:67
 ext4_init_new_dir fs/ext4/namei.c:2757 [inline]
 ext4_mkdir+0x5e0/0xdf0 fs/ext4/namei.c:2802
 vfs_mkdir+0x419/0x690 fs/namei.c:3627
 do_mkdirat+0x21e/0x280 fs/namei.c:3650
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x4b02a0
Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c00004d4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 000000c00002ea00 RCX: 00000000004b02a0
RDX: 00000000000001c0 RSI: 000000c000122dc0 RDI: ffffffffffffff9c
RBP: 000000c00004d510 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
R13: 000000000000006f R14: 000000000000006e R15: 0000000000000100