From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f70.google.com (mail-oa1-f70.google.com [209.85.160.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 478892F1FED for ; Sat, 21 Mar 2026 18:23:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774117384; cv=none; b=csnk7VAi/5QH1dcTxlL2pDrc9hWTKjQD30ma9AJM1mXqQxwzhyuHeP6cQS5zfPxplA854MEf2r2Oi00DyZw4dHpCGOjwZixSXUt4tXAu9B8w1cPjRRUjcuBKex+xM/IQeBBF59mJ6Mfp4fWH0qNlHvBnXuTIRVUccrd0zQDoTio= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774117384; c=relaxed/simple; bh=CM/AhOsaMLKtMkaIPw4XuK9xpN5TkjgbjmED9X04sAQ=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=h3vTbcsY/Jgly3WFcPY/40iqpFqUnLqlgnnQxL+eULNPUc+YjPDrS+zLky2ibUVyhv3H4hbjqmQp8DcKslxnDBvfgLEMOb9Z9gwQW/9F9n2iqzS0mq35a9vC5kLn6w8qnsHc4HsIujaEKSVqDKrFcMBtfy+NvgScW0D73bAuz8M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.160.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f70.google.com with SMTP id 586e51a60fabf-417323e3806so13025293fac.2 for ; Sat, 21 Mar 2026 11:23:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774117382; x=1774722182; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IcgXqIyxAHIOe2FthrA+nqxVSGArWTo1PbSSv9HunHo=; b=rBT2sB6dKe2QMXYzGDdkQVMDf8MM5eRuN9a+sOPdHEqRS0uR/3fecwjEUVvDJ1J/lt TTQLHHpn8yONrqj5shrfZwMM7WWBb/iWcYoBCMmHFJ7Z7aw0x7NIWjussdq7dcj9L7Pd ZWbgOJ4FR6lH3aIt9VgzE0ao23UUtF7GJtYjgm3HR4LzPTjZMC7fdRRrcw+Xx9ZfaGLK MhHww51iwXn0AmldwnX9mtbkyDNwfgs6lWYFKq9rUGJix2K9o38vx8YujkXku+5JpDpp VMgR2SrCd2ZIQaIOU5wtK2YTU6VIkLYD/empph5SEVL5cSGxeg7iwZJ3cuOSESvK6ztK pdBA== X-Gm-Message-State: AOJu0YzofxBh1gvNTDrgobP+8FtMDVKbV9Xfy/WB+l8wYM35K96fQeAC q63rWtWOPXoPj7OTCY7ccR02aGJ/tBsQaTk1T35y0H2iW7Z8om2cO6QANkhwW3HFbAF2xzCPEUC LrYTtKUVrCc+rS6Dwn4YscEmBwKEwIU+8ieruIzu0z7f99ZnOy8K/rukxU88= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1f06:b0:67b:a8c3:6c9f with SMTP id 006d021491bc7-67c22ef67ccmr5051301eaf.18.1774117382225; Sat, 21 Mar 2026 11:23:02 -0700 (PDT) Date: Sat, 21 Mar 2026 11:23:02 -0700 In-Reply-To: <871phdrrii.fsf@redhat.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bee206.050a0220.3bf4de.005b.GAE@google.com> Subject: Re: [syzbot] [kernel?] INFO: task hung in vfs_coredump (2) From: syzbot To: linux-kernel@vger.kernel.org, syoshida@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in vfs_coredump INFO: task syz.0.17:6434 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:28424 pid:6434 tgid:6432 ppid:6327 task_flags:0x400640 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0xfee/0x6120 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7008 schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121 wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:269 coredump_wait fs/coredump.c:534 [inline] vfs_coredump+0x80d/0x5570 fs/coredump.c:1197 get_signal+0x1f2a/0x21e0 kernel/signal.c:3019 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x668/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f994879af39 RSP: 002b:00007f99497010e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f9948a06098 RCX: 00007f994879af39 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9948a0609c RBP: 00007f9948a06090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9948a06128 R14: 00007ffd4eff3890 R15: 00007ffd4eff3978 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e5ce2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e5ce2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e5ce2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775 2 locks held by getty/5581: #0: ffff888037b420a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1500 drivers/tty/n_tty.c:2211 1 lock held by syz.0.17/6433: 1 lock held by syz.1.18/6456: 1 lock held by syz.2.19/6480: 5 locks held by syz.3.20/6510: 1 lock held by syz.4.21/6540: 1 lock held by syz.5.22/6569: 2 locks held by syz.6.23/6606: 1 lock held by syz.7.24/6637: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x141/0x190 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline] watchdog+0xd25/0x1050 kernel/hung_task.c:515 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6480 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:memset_orig+0x3a/0xb0 arch/x86/lib/memset_64.S:71 Code: 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 <48> 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 RSP: 0018:ffffc90002e77028 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffc90002e77240 RCX: 0000000000000024 RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff88805e0546c0 RBP: 0000000000001000 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88805e054000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc90002e77248 R14: 0000000000001000 R15: 0000000000000000 FS: 00007fd2a88bb6c0(0000) GS:ffff88812472f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555882e94e8 CR3: 000000007846e000 CR4: 00000000003526f0 Call Trace: zero_to_iter lib/iov_iter.c:461 [inline] iterate_kvec include/linux/iov_iter.h:86 [inline] iterate_and_advance2 include/linux/iov_iter.h:308 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] iov_iter_zero+0x9bd/0x15b0 lib/iov_iter.c:467 hugetlbfs_read_iter+0x6e3/0x8c0 fs/hugetlbfs/inode.c:277 __kernel_read+0x397/0xac0 fs/read_write.c:532 integrity_kernel_read+0x7e/0xb0 security/integrity/iint.c:28 ima_calc_file_hash_tfm+0x25e/0x350 security/integrity/ima/ima_crypto.c:480 ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x18c/0x480 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x887/0xa40 security/integrity/ima/ima_api.c:295 process_measurement+0xdfe/0x2350 security/integrity/ima/ima_main.c:407 ima_file_mmap+0x1c4/0x1f0 security/integrity/ima/ima_main.c:505 security_mmap_file+0x278/0x9b0 security/security.c:2504 vm_mmap_pgoff+0xec/0x470 mm/util.c:575 ksys_mmap_pgoff+0x273/0x650 mm/mmap.c:605 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd2a799af39 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd2a88bb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fd2a7c05fa0 RCX: 00007fd2a799af39 RDX: 00004000000000df RSI: 0000004000000001 RDI: 0000000000000008 RBP: 00007fd2a7a2fee0 R08: ffffffffffffffff R09: 0000300000000000 R10: 0000000000040eb1 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd2a7c06038 R14: 00007fd2a7c05fa0 R15: 00007fff04aad838 Tested on: commit: 113ae7b4 Merge tag 'hwmon-for-v7.0-rc5' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13e2ccba580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c91defb609dfc805 dashboard link: https://syzkaller.appspot.com/bug?extid=6ed94e81a1492fe1d512 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=1082ccba580000