Reminder: 19 open syzbot bugs in perf subsystem

From: Eric Biggers
Date: Tue Jul 23 2019 - 21:45:16 EST

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Of the currently open syzbot reports against the upstream kernel, I've manually
marked 19 of them as possibly being bugs in the perf subsystem. I've listed
these reports below, sorted by an algorithm that tries to list first the reports
most likely to be still valid, important, and actionable.

Of these 19 bugs, 4 were seen in mainline in the last week.

Of these 19 bugs, 2 were bisected to commits from the following people:

Song Liu <songliubraving@xxxxxx>
Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

If you believe a bug is no longer valid, please close the syzbot report by
sending a '#syz fix', '#syz dup', or '#syz invalid' command in reply to the
original thread, as explained at https://goo.gl/tpsmEJ#status

If you believe I misattributed a bug to the perf subsystem, please let me know,
and if possible forward the report to the correct people or mailing list.

Here are the bugs:

--------------------------------------------------------------------------------
Title: INFO: rcu detected stall in sys_sendfile64 (2)
Last occurred: 1 day ago
Reported: 185 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=6a6553c3d34bb00172b5cbd32f4912151b6133dc
Original thread: https://lkml.kernel.org/lkml/00000000000010b2fc057fcdfaba@xxxxxxxxxx/T/#u

This bug has a C reproducer.

syzbot has bisected this bug, but I think the bisection result is incorrect.

The original thread for this bug received 15 replies; the last was 125 days ago.

I'm not confident this bug is really in the perf subsystem. I also think it
might be in the fs/ext4 subsystem.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+1505c80c74256c6118a5@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/00000000000010b2fc057fcdfaba@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: INFO: rcu detected stall in ext4_file_write_iter
Last occurred: 3 days ago
Reported: 147 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=bc195cf62ac17381792072c72a692bf133c528d4
Original thread: https://lkml.kernel.org/lkml/0000000000009a01370582c6772a@xxxxxxxxxx/T/#u

This bug has a C reproducer.

The original thread for this bug received 4 replies; the last was 145 days ago.

I'm not confident this bug is really in the perf subsystem. I also think it
might be in the fs/ext4 subsystem.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+7d19c5fe6a3f1161abb7@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/0000000000009a01370582c6772a@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: INFO: task hung in do_exit
Last occurred: 1 day ago
Reported: 101 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=3e6c42e24155e5f0125368e609bee32f2b7394fe
Original thread: https://lkml.kernel.org/lkml/000000000000e02bf505866414ae@xxxxxxxxxx/T/#u

This bug has a syzkaller reproducer only.

syzbot has bisected this bug, but I think the bisection result is incorrect.

The original thread for this bug received 1 reply, 100 days ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+9880e421ec82313d6527@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000e02bf505866414ae@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING in arch_install_hw_breakpoint
Last occurred: 5 days ago
Reported: 121 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=7250aa28cb43ada4cba944fe46d80f67435022ef
Original thread: https://lkml.kernel.org/lkml/000000000000639f6a0584d11b82@xxxxxxxxxx/T/#u

This bug has a C reproducer.

The original thread for this bug received 8 replies; the last was 117 days ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+370a6b0f11867bf13515@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000639f6a0584d11b82@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING in tracepoint_probe_register_prio (3)
Last occurred: 0 days ago
Reported: 431 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=63e3738079e5b2a71cd19820e454b8ac315c7550
Original thread: https://lkml.kernel.org/lkml/000000000000ab6f84056c786b93@xxxxxxxxxx/T/#u

Unfortunately, this bug does not have a reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+774fddf07b7ab29a1e55@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000ab6f84056c786b93@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING in add_event_to_ctx
Last occurred: 21 days ago
Reported: 33 days ago
Branches: Mainline
Dashboard link: https://syzkaller.appspot.com/bug?id=c0b2e13c4e106f405e56cc89843b0e54eb6d9e52
Original thread: https://lkml.kernel.org/lkml/000000000000946842058bc1291d@xxxxxxxxxx/T/#u

This bug has a C reproducer.

This bug was bisected to:

commit 33ea4b24277b06dbc55d7f5772a46f029600255e
Author: Song Liu <songliubraving@xxxxxx>
Date: Wed Dec 6 22:45:16 2017 +0000

  perf/core: Implement the 'perf_uprobe' PMU

No one has replied to the original thread for this bug yet.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+704bfe2c7d156640ad7a@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000946842058bc1291d@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING in perf_reg_value
Last occurred: 25 days ago
Reported: 34 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=629d95983fbba49821af91acf780387bca180546
Original thread: https://lkml.kernel.org/lkml/000000000000734545058bb27ebb@xxxxxxxxxx/T/#u

This bug has a C reproducer.

This bug was bisected to:

commit 878068ea270ea82767ff1d26c91583263c81fba0
Author: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Date: Tue Apr 2 19:44:59 2019 +0000

  perf/x86: Support outputting XMM registers

The original thread for this bug has received 3 replies; the last was 33 days
ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+10189b9b0f8c4664badd@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000734545058bb27ebb@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: INFO: task hung in __do_page_fault (2)
Last occurred: 19 days ago
Reported: 269 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=9e5eb5f575324225d04b9b3095f5c3fc71700f08
Original thread: https://lkml.kernel.org/lkml/0000000000006e31980579315914@xxxxxxxxxx/T/#u

This bug has a C reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+6b074f741adbd93d2df5@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/0000000000006e31980579315914@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: KASAN: stack-out-of-bounds Read in update_stack_state
Last occurred: 28 days ago
Reported: 517 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=51b058f4d86b9045d31b6bbe97211d3ebc96d4fa
Original thread: https://lkml.kernel.org/lkml/001a1143e62e6f71d20565bf329f@xxxxxxxxxx/T/#u

This bug has a C reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+2990ca6e76c080858a9c@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/001a1143e62e6f71d20565bf329f@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING in perf_group_attach
Last occurred: 14 days ago
Reported: 207 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=bc574683e1e3241992f8460c82ddac937e3c88b9
Original thread: https://lkml.kernel.org/lkml/0000000000001282e1057e14848e@xxxxxxxxxx/T/#u

This bug has a C reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+23fe48cbe532abffa52e@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/0000000000001282e1057e14848e@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: INFO: task hung in exit_mm
Last occurred: 26 days ago
Reported: 22 days ago
Branches: Mainline
Dashboard link: https://syzkaller.appspot.com/bug?id=dd115babf1498c3370fab8758d58940b7c6bffa4
Original thread: https://lkml.kernel.org/lkml/000000000000a193aa058c9a6499@xxxxxxxxxx/T/#u

This bug has a syzkaller reproducer only.

The original thread for this bug has received 3 replies; the last was 21 days
ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+8cc1843d4eec9c0dfb35@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000a193aa058c9a6499@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: KASAN: use-after-free Read in refcount_sub_and_test_checked (2)
Last occurred: 95 days ago
Reported: 202 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=eaf7abde8e5497bbf7403a3d2afb9226005362cf
Original thread: https://lkml.kernel.org/lkml/0000000000004a6d7c057e77e97e@xxxxxxxxxx/T/#u

This bug has a syzkaller reproducer only.

syzbot has bisected this bug, but I think the bisection result is incorrect.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+b0775615fa4c4479b691@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/0000000000004a6d7c057e77e97e@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: KASAN: use-after-free Read in uprobe_perf_close
Last occurred: 158 days ago
Reported: 476 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=3fb9c4777053e79a6d2a65ac3738664c87629a21
Original thread: https://lkml.kernel.org/lkml/001a113f8bf6a9acd90568e8ea59@xxxxxxxxxx/T/#u

This bug has a C reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+cef9473c7fa0fe8ab95e@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/001a113f8bf6a9acd90568e8ea59@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: KASAN: use-after-free Read in _free_event
Last occurred: 30 days ago
Reported: 29 days ago
Branches: Mainline
Dashboard link: https://syzkaller.appspot.com/bug?id=178d9570289a3e1aaf929f00e78b0d9596fccc7c
Original thread: https://lkml.kernel.org/lkml/000000000000dea828058c0d815d@xxxxxxxxxx/T/#u

Unfortunately, this bug does not have a reproducer.

The original thread for this bug has received 1 reply, 29 days ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+37100ea87beb0cac28f4@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000dea828058c0d815d@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: general protection fault in perf_tp_event
Last occurred: 21 days ago
Reported: 445 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=db96e8cebcedb255a170187c8add3ea0745db13b
Original thread: https://lkml.kernel.org/lkml/000000000000c39de9056b5a46ca@xxxxxxxxxx/T/#u

Unfortunately, this bug does not have a reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+2f86b8550eb66cbd5808@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000c39de9056b5a46ca@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING: ODEBUG bug in __do_softirq
Last occurred: 95 days ago
Reported: 521 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=26c9593893aa8625f556867ea71649010a07e74d
Original thread: https://groups.google.com/d/msgid/syzkaller-bugs/001a1143e62eb6a9510565640e76%40google.com

This bug has a syzkaller reproducer only.

syzbot has bisected this bug, but I think the bisection result is incorrect.

For some reason the original report email for this bug is missing from the LKML
archive at lore.kernel.org, so my script couldn't check whether anyone has
replied to it or not. The Google Groups link above should still work, though.
Also try searching for the bug title.

--------------------------------------------------------------------------------
Title: INFO: rcu detected stall in __perf_sw_event
Last occurred: 103 days ago
Reported: 166 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=c97097e0408c6c6f60ac89b78faaf0e42663cbac
Original thread: https://lkml.kernel.org/lkml/00000000000003cadb05814f3284@xxxxxxxxxx/T/#u

This bug has a syzkaller reproducer only.

syzbot has bisected this bug, but I think the bisection result is incorrect.

The original thread for this bug received 2 replies; the last was 117 days ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+a41ac89a0712acde0e84@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/00000000000003cadb05814f3284@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: WARNING in event_function_local
Last occurred: 286 days ago
Reported: 542 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=ea9e1f49354606d70d272294fcc1d80a86ea0e6b
Original thread: https://lkml.kernel.org/lkml/001a1140589435c9b60563c76e3f@xxxxxxxxxx/T/#u

This bug has a C reproducer.

The original thread for this bug received 8 replies; the last was 160 days ago.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+352bd10e338d9a90e5e0@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/001a1140589435c9b60563c76e3f@xxxxxxxxxx

--------------------------------------------------------------------------------
Title: INFO: task hung in uprobe_start_dup_mmap
Last occurred: 106 days ago
Reported: 320 days ago
Branches: Mainline and others
Dashboard link: https://syzkaller.appspot.com/bug?id=4432696d9b58dd75ab7ea39171bfaaed10f44d47
Original thread: https://lkml.kernel.org/lkml/000000000000d83699057536ce5b@xxxxxxxxxx/T/#u

Unfortunately, this bug does not have a reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
Reported-by: syzbot+cad3df271fa4d88da051@xxxxxxxxxxxxxxxxxxxxxxxxx

If you send any email or patch for this bug, please consider replying to the
original thread. For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000d83699057536ce5b@xxxxxxxxxx