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upstream test error: BUG: using smp_processor_id() in preemptible code in ext4_map_blocks

Status: fixed on 2020/07/17 17:58
Subsystems: ext4
[Documentation on labels]
Fix commit: 811985365378 ext4: mballoc: Use this_cpu_read instead of this_cpu_ptr
First crash: 1471d, last: 1471d

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: 0 PID: 6730 Comm: systemd-rfkill 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+0x18f/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_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+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7efcfea40687
Code: Bad RIP value.
RSP: 002b:00007ffe6736fae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000555a4c432985 RCX: 00007efcfea40687
RDX: 00007ffe6736f9b0 RSI: 00000000000001ed RDI: 0000555a4c432985
RBP: 00007efcfea40680 R08: 0000000000000100 R09: 0000000000000000
R10: 0000555a4c432980 R11: 0000000000000246 R12: 00000000000001ed
R13: 00007ffe6736fc70 R14: 0000000000000000 R15: 0000000000000000

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/13 17:08 upstream df2fbf5bfa0e dbce178a .config console log report ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.