bpf test error: BUG: using smp_processor_id() in preemptible code in ext4_mb_new

bpf test error: BUG: using smp_processor_id() in preemptible code in ext4_mb_new_blocks
Status: fixed on 2020/07/17 17:58
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: 811985365378 ext4: mballoc: Use this_cpu_read instead of this_cpu_ptr
First crash: 540d, last: 538d

Sample crash report:

BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6730
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 1 PID: 6730 Comm: systemd-rfkill 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+0x18f/0x20d lib/dump_stack.c:118
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
 ext4_ext_map_blocks+0x201b/0x33e0 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:3641
 do_mkdirat+0x21e/0x280 fs/namei.c:3664
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f3f5ea41687
Code: Bad RIP value.
RSP: 002b:00007ffeaa42f998 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 000055fb3da07985 RCX: 00007f3f5ea41687
RDX: 00007ffeaa42f860 RSI: 00000000000001ed RDI: 000055fb3da07985
RBP: 00007f3f5ea41680 R08: 0000000000000100 R09: 0000000000000000
R10: 000055fb3da07980 R11: 0000000000000246 R12: 00000000000001ed
R13: 00007ffeaa42fb20 R14: 0000000000000000 R15: 0000000000000000

Crashes (48):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report
ci-upstream-bpf-kasan-gce	2020/06/18 08:15	bpf	8030e250d882	d45a4d69	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/18 05:57	bpf	8030e250d882	d45a4d69	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 19:45	bpf	8030e250d882	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 19:45	bpf	8030e250d882	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 18:50	bpf	02553b91da5d	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 18:50	bpf	02553b91da5d	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 18:50	bpf	02553b91da5d	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 05:11	bpf	6903cdae9f9f	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 05:11	bpf	6903cdae9f9f	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/17 05:10	bpf	6903cdae9f9f	b9f3810b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 20:28	bpf	6903cdae9f9f	559fbe2d	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 20:28	bpf	6903cdae9f9f	559fbe2d	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 20:28	bpf	6903cdae9f9f	559fbe2d	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 17:45	bpf	463f91b0a1f7	559fbe2d	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 17:45	bpf	463f91b0a1f7	559fbe2d	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 17:45	bpf	463f91b0a1f7	559fbe2d	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 15:17	bpf	463f91b0a1f7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 15:17	bpf	463f91b0a1f7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 15:17	bpf	463f91b0a1f7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 13:33	bpf	6903cdae9f9f	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 13:33	bpf	6903cdae9f9f	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 13:33	bpf	6903cdae9f9f	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 07:02	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 07:02	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 07:02	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 05:55	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 05:55	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 05:55	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 03:40	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 03:40	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 03:40	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 02:15	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 02:15	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 02:15	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 00:33	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 00:33	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/16 00:33	bpf	c34a06c56df7	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/15 22:30	bpf	b3a9e3b9622a	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/15 22:30	bpf	b3a9e3b9622a	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/15 22:30	bpf	b3a9e3b9622a	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/15 20:44	bpf	b3a9e3b9622a	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/15 20:44	bpf	b3a9e3b9622a	baca2611	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/15 20:44	bpf	b3a9e3b9622a	baca2611	.config	log	report