syzbot


INFO: task can't die in iterate_supers

Status: auto-closed as invalid on 2021/01/13 08:38
Subsystems: ceph fs
[Documentation on labels]
Reported-by: syzbot+eeb3d03618bf784ed400@syzkaller.appspotmail.com
First crash: 1316d, last: 1316d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task can't die in iterate_supers (2) ceph fs 1 1104d 1100d 0/27 auto-closed as invalid on 2021/08/13 03:51

Sample crash report:
INFO: task syz-executor.1:18964 can't die for more than 143 seconds.
task:syz-executor.1  state:D stack:29632 pid:18964 ppid:  8476 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4269 [inline]
 __schedule+0x890/0x2030 kernel/sched/core.c:5019
 schedule+0xcf/0x270 kernel/sched/core.c:5098
 rwsem_down_read_slowpath+0x328/0xc90 kernel/locking/rwsem.c:1099
 __down_read kernel/locking/rwsem.c:1341 [inline]
 down_read+0x1ec/0x420 kernel/locking/rwsem.c:1494
 iterate_supers+0xdb/0x290 fs/super.c:692
 ksys_sync+0x86/0x150 fs/sync.c:114
 __do_sys_sync+0xa/0x10 fs/sync.c:125
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: Unable to access opcode bytes at RIP 0x45de8f.
RSP: 002b:00007fcdd2ecbc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00000000000352c0 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000118bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffdad4bd16f R14: 00007fcdd2ecc9c0 R15: 000000000118bf2c

Showing all locks held in the system:
1 lock held by khungtaskd/1656:
 #0: ffffffff8b339ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252
2 locks held by syz-executor.0/14179:
 #0: ffff8880726580e0 (&type->s_umount_key#72/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229
 #1: ffff8880165bc0e0 (&type->s_umount_key#73){++++}-{3:3}, at: grab_super+0x59/0x260 fs/super.c:389
2 locks held by syz-executor.0/14215:
 #0: ffff8880165bc0e0 (&type->s_umount_key#72/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229
 #1: ffff888070e14090 (&client->mount_mutex){+.+.}-{3:3}, at: ceph_real_mount fs/ceph/super.c:924 [inline]
 #1: ffff888070e14090 (&client->mount_mutex){+.+.}-{3:3}, at: ceph_get_tree+0x702/0x1750 fs/ceph/super.c:1093
1 lock held by syz-executor.1/18964:
 #0: ffff8880165bc0e0 (&type->s_umount_key#73){++++}-{3:3}, at: iterate_supers+0xdb/0x290 fs/super.c:692

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Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/14 08:37 linux-next 92edc4aef867 1bf9a662 .config console log report info ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.