From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (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 123E4175A74 for ; Sat, 21 Mar 2026 18:05:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774116304; cv=none; b=nWJUm/ZsysUeEUozlBj9xboNwJDX/L1wB18IF5w0w6SUv+0xf8uejYK0TRYeWo6mQhp+4yS6elqqmnsSilkS8AcPeuOUpkPRGdGhjhdN/Y1XBJik+iVtLdXXzD1ZtV3KVKp02EBdpllwFl1TgH1M/zGc5Z2mgO41u7+HVyNgMyk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774116304; c=relaxed/simple; bh=khFyHC1ik6igSVZArBONFJSYRQk2YxCr8RJHDmLuaUI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=MmdsH9JPcmoJDn+j+aPfXYwjYcpqV6QBJLSrXFf/pOxU1b7MsSHHLh+nSSIMgr0Q6Kqqnh8YbcDSun6iO+ZU7XVIKv/izglvnLeFPEQc6kyAt5nsBquTPySLVfJ9y/T0O4e/KypXSxuqFq3E1LgkjMwyi9iZuy/J1RJniIFTHDE= 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=209.85.161.69 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-oo1-f69.google.com with SMTP id 006d021491bc7-67bc5678917so12841208eaf.2 for ; Sat, 21 Mar 2026 11:05:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774116302; x=1774721102; 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=MyWU9Jmu5gntzq3qaTz2IUzPc4PgHUTECNhttSle1pM=; b=VeDI+JkIO/udVKLRLXA9SHCVlsSXpbK7qGpcNvPxhph0EsFyYahVBs98rjJi3FT4HK Je/qc5ljBLe3eMYHQPoXt1AwLaqujcrilK/2KYrq1zdV47gZuyggZ28f3FwcS7dR9651 w94267zKDv28HXsLg+oPH7Kh88zTOaBykVWIECxC7TntycvP2lttDng4Tv+D34qWh6Ev oryoqDBfIJetfxp1oD1MUIYIFfO020g45PEBpItU1njM4jkpGq2WDVULZuuNBhgk7BKn 2LkPbuk0YDCCAfCMa3GiZTCZAFjpjLgo/bCkb9cWBFy63EWF0htN/Vzf+Ak8CyNJXcl1 AWMw== X-Gm-Message-State: AOJu0Yy8yuOl8ybgmccSzJsqpzM/iqfS4gwnjMWyWUU7ann1kflV6ZeJ R0cXMb3ETg6ta78cRBH9EICqBkU8AzROXbwM0YoPOFHW9JPhr7N4IvHyXrXwUXO9cS113+ARIay q8FHKWjJUs4RhnrU7kMawc1bqwb3A8d+NnlGbIxOrChb/QYGvzlQtc2R/z/c= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:178c:b0:67b:b13c:5a0d with SMTP id 006d021491bc7-67c22f50ebcmr4806901eaf.46.1774116302077; Sat, 21 Mar 2026 11:05:02 -0700 (PDT) Date: Sat, 21 Mar 2026 11:05:02 -0700 In-Reply-To: <87a4w1rs7h.fsf@redhat.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69beddce.050a0220.3bf4de.0056.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.0.17:6440 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:28400 pid:6440 tgid:6438 ppid:6342 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: 0033:0x7f0a20d9af39 RSP: 002b:00007f0a21b690e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f0a21006098 RCX: 00007f0a20d9af39 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f0a2100609c RBP: 00007f0a21006090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0a21006128 R14: 00007ffdc3a2cb70 R15: 00007ffdc3a2cc58 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 4 locks held by kworker/u8:4/60: #0: ffff8880b853b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:647 #1: ffff8880b8524648 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:225 [inline] #1: ffff8880b8524648 (psi_seq){-.-.}-{0:0}, at: __schedule+0x2c11/0x6120 kernel/sched/core.c:6905 #2: ffff8880b8526358 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x6e7/0xca0 kernel/time/timer.c:1117 #3: ffffffff9b0f2e60 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x144/0x490 lib/debugobjects.c:835 2 locks held by getty/5582: #0: ffff888032e940a0 (&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.0.17/6439: 1 lock held by syz.1.18/6463: 1 lock held by syz.2.19/6486: 2 locks held by syz.3.20/6516: 1 lock held by syz.4.21/6547: 1 lock held by syz.5.22/6577: 1 lock held by syz.6.23/6614: 1 lock held by syz.7.24/6647: ============================================= 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: 6486 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:sha256_transform_rorx+0xdd2/0x1110 lib/crypto/x86/sha256-avx2-asm.S:650 Code: c4 43 7b f0 e3 02 44 03 54 3c 14 09 de 45 31 e6 45 89 dc 21 c6 41 21 dc 45 01 ef 44 01 d1 44 09 e6 45 01 f2 44 01 f9 45 01 fa <45> 89 c7 c4 63 7b f0 e9 19 c4 63 7b f0 f1 0b 41 31 d7 45 31 f5 c4 RSP: 0018:ffffc900033970a0 EFLAGS: 00000a03 RAX: 000000000fc16320 RBX: 0000000041b41c96 RCX: 00000000e2f40420 RDX: 00000000415f425e RSI: 00000000099521a6 RDI: 0000000000000100 RBP: ffffc900033972c0 R08: 00000000ec3afa8e R09: 00000000be60ae5f R10: 000000006a33a7ef R11: 00000000991721ee R12: 0000000001140086 R13: 0000000077102bc3 R14: 00000000f5b6baa6 R15: 00000000c96a7222 FS: 00007f1f36bc06c0(0000) GS:ffff88812472f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f331ad05ff8 CR3: 000000002b7a6000 CR4: 00000000003526f0 Call Trace: sha256_blocks_avx2+0x49/0x90 lib/crypto/x86/sha256.h:31 sha256_blocks lib/crypto/x86/sha256.h:37 [inline] __sha256_update+0x188/0x1c0 lib/crypto/sha256.c:208 crypto_sha256_update+0x23/0x30 crypto/sha256.c:142 crypto_shash_finup+0x34b/0x6b0 crypto/shash.c:123 crypto_shash_update include/crypto/hash.h:1006 [inline] ima_calc_file_hash_tfm+0x299/0x350 security/integrity/ima/ima_crypto.c:491 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: 0033:0x7f1f35d9af39 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:00007f1f36bc0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f1f36005fa0 RCX: 00007f1f35d9af39 RDX: 00004000000000df RSI: 0000004000000001 RDI: 0000000000000008 RBP: 00007f1f35e2fee0 R08: ffffffffffffffff R09: 0000300000000000 R10: 0000000000040eb1 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1f36006038 R14: 00007f1f36005fa0 R15: 00007fff0f5b0ad8 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=1242ccba580000 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=10bcccba580000