syzbot


INFO: rcu detected stall in ext4_file_write_iter
Status: fixed on 2020/09/25 01:17
Reported-by: syzbot+7d19c5fe6a3f1161abb7@syzkaller.appspotmail.com
Fix commit: 7e24969022cb block: allow for_each_bvec to support zero len bvec
First crash: 982d, last: 412d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: INFO: rcu detected stall in ext4_file_write_iter (log)
Repro: C syz .config

Fix bisection: fixed by (bisect log) :
commit 7e24969022cbd61ddc586f14824fc205661bb124
Author: Ming Lei <ming.lei@redhat.com>
Date: Mon Aug 17 10:00:55 2020 +0000

  block: allow for_each_bvec to support zero len bvec

similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: rcu detected stall in ext4_file_write_iter syz 2 847d 888d 0/3 public: reported syz repro on 2019/04/23 08:58
upstream INFO: rcu detected stall in ext4_file_write_iter (2) 1 350d 350d 0/22 auto-closed as invalid on 2021/01/10 12:58
linux-4.14 INFO: rcu detected stall in ext4_file_write_iter C 7 5d00h 899d 0/1 upstream: reported C repro on 2019/04/12 16:30
linux-4.19 INFO: rcu detected stall in ext4_file_write_iter C 7 7d01h 891d 0/1 upstream: reported C repro on 2019/04/20 13:09

Sample crash report:

Crashes (93):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2020/07/28 11:24 upstream 92ed30191993 cb93dc6a .config log report syz C
ci-upstream-kasan-gce-selinux-root 2020/07/27 20:57 upstream 92ed30191993 cb93dc6a .config log report syz C
ci-upstream-kasan-gce 2020/07/25 15:41 upstream 68845a55c31b 1f7cc1ca .config log report syz C
ci-upstream-kasan-gce 2020/07/24 04:54 upstream d15be546031c 70c104a1 .config log report syz C
ci-upstream-kasan-gce-smack-root 2019/06/22 20:00 upstream abf02e2964b3 34bf9440 .config log report syz C
ci-upstream-kasan-gce-root 2019/05/03 16:28 upstream ea9866793d1e 1bfa09b9 .config log report syz C
ci-upstream-kasan-gce-root 2019/04/12 03:29 upstream 2d06b235815e 13030ef8 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2019/02/22 06:00 upstream 8a61716ff2ab 7ff74a98 .config log report syz C
ci-upstream-linux-next-kasan-gce-root 2020/07/30 16:29 linux-next 04b457178630 233283a1 .config log report syz C
ci-upstream-linux-next-kasan-gce-root 2019/06/30 05:07 linux-next 48568d8c7f47 7509bf36 .config log report syz C
ci-upstream-kasan-gce-root 2020/07/28 01:23 upstream 92ed30191993 cb93dc6a .config log report syz
ci-upstream-kasan-gce-selinux-root 2020/07/27 09:43 upstream 92ed30191993 51265195 .config log report syz
ci-upstream-kasan-gce-smack-root 2020/07/25 11:27 upstream 68845a55c31b 1f7cc1ca .config log report syz
ci-upstream-linux-next-kasan-gce-root 2020/07/27 05:47 linux-next 26027945c94a 51265195 .config log report syz
ci-upstream-kasan-gce-selinux-root 2020/08/11 10:29 upstream 00e4db51259a bacaf5fa .config log report
ci-upstream-kasan-gce-smack-root 2020/07/29 09:26 upstream 6ba1b005ffc3 19a8de55 .config log report
ci-upstream-kasan-gce-selinux-root 2020/05/23 21:45 upstream 423b8baf18a8 9682898d .config log report
ci-upstream-kasan-gce-root 2020/04/21 02:39 upstream ae83d0b416db 98a9f9e6 .config log report
ci-upstream-kasan-gce-root 2020/04/18 08:08 upstream 95988fbc7c31 435c6d53 .config log report
ci-upstream-kasan-gce-root 2020/04/02 21:11 upstream 7be97138e727 a34e2c33 .config log report
ci-upstream-kasan-gce-root 2020/03/26 03:05 upstream 1b649e0bcae7 e8e6c7d2 .config log report
ci-upstream-kasan-gce-selinux-root 2020/03/19 18:23 upstream cd607737f3b8 2c31c529 .config log report
ci-upstream-kasan-gce-root 2020/03/11 09:50 upstream e94148454103 35f53e45 .config log report
ci-upstream-kasan-gce-selinux-root 2020/03/04 15:44 upstream 63623fd44972 c88c7b75 .config log report
ci-upstream-kasan-gce-selinux-root 2020/02/28 07:43 upstream f8788d86ab28 59b57593 .config log report
ci-upstream-kasan-gce-root 2020/02/17 15:26 upstream 11a48a5a18c6 2b411596 .config log report
ci-upstream-kasan-gce-selinux-root 2020/02/17 12:56 upstream 11a48a5a18c6 2b411596 .config log report
ci-upstream-kasan-gce-selinux-root 2020/02/15 22:49 upstream 829e69446995 5d7b90f1 .config log report
ci-upstream-kasan-gce-smack-root 2020/02/12 14:36 upstream 359c92c02bfa 84f4fc8a .config log report
ci-upstream-kasan-gce-selinux-root 2020/02/12 03:58 upstream 359c92c02bfa a75b198c .config log report
ci-upstream-kasan-gce-selinux-root 2020/02/11 15:39 upstream 0a679e13ea30 4d1ab643 .config log report
ci-upstream-kasan-gce-root 2020/02/03 23:16 upstream 754beeec1d90 93e5e335 .config log report
ci-upstream-kasan-gce-root 2020/01/12 22:47 upstream 6327edceb62b 31290a45 .config log report
ci-upstream-kasan-gce-smack-root 2020/01/08 02:23 upstream ae6088216ce4 6738e0b3 .config log report
ci-upstream-kasan-gce-smack-root 2020/01/08 01:13 upstream ae6088216ce4 6738e0b3 .config log report
ci-upstream-kasan-gce-root 2019/12/25 18:45 upstream 46cf053efec6 be5c2c81 .config log report
ci-upstream-kasan-gce-selinux-root 2019/12/21 11:32 upstream 6398b9fc818e bc586918 .config log report
ci-upstream-kasan-gce-smack-root 2019/12/03 09:47 upstream 596cf45cbf6e ab342da3 .config log report
ci-upstream-kasan-gce-smack-root 2019/12/02 23:38 upstream 596cf45cbf6e ab342da3 .config log report
ci-upstream-kasan-gce-root 2019/07/20 15:14 upstream abdfd52a295f 1656845f .config log report
ci-upstream-kasan-gce-smack-root 2019/06/20 07:02 upstream abf02e2964b3 34bf9440 .config log report
ci-upstream-kasan-gce-selinux-root 2019/06/14 09:21 upstream c11fb13a117e 998ccc76 .config log report
ci-upstream-kasan-gce-smack-root 2019/06/14 09:19 upstream c11fb13a117e 998ccc76 .config log report
ci-upstream-kasan-gce-root 2019/06/14 09:19 upstream c11fb13a117e 998ccc76 .config log report
ci-upstream-kasan-gce-root 2019/06/13 12:05 upstream b076173a309e 3f4e812b .config log report
ci-upstream-kasan-gce-smack-root 2019/01/19 05:29 upstream 2339e91d0e66 2103a236 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/06/13 19:36 linux-next e7b08814b16b dbce178a .config log report
ci-upstream-linux-next-kasan-gce-root 2020/06/13 06:12 linux-next e7b08814b16b f4724dd3 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/04/14 14:59 linux-next f19bb13a0eaf 3f3c5574 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/03/09 22:00 linux-next 770fbb32d34e 35f53e45 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/02/18 07:04 linux-next c25a951c50dc 1ce142dc .config log report
ci-upstream-linux-next-kasan-gce-root 2020/02/16 03:06 linux-next 9f01828e9e16 5d7b90f1 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/02/06 18:46 linux-next a0c61bf1c773 c91cbc9d .config log report
ci-upstream-linux-next-kasan-gce-root 2019/07/20 01:36 linux-next 6d21a41b7b1f 1656845f .config log report
ci-upstream-linux-next-kasan-gce-root 2019/07/02 08:57 linux-next 48a8a5f9a326 cccc4302 .config log report
ci-upstream-linux-next-kasan-gce-root 2019/06/23 05:58 linux-next dc636f5d78de 34bf9440 .config log report
ci-upstream-linux-next-kasan-gce-root 2019/06/17 14:26 linux-next a125097c8410 442206d7 .config log report