syzbot

INFO: task syz.0.17:5990 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:28456 pid:5990  tgid:5989  ppid:5944   task_flags:0x400640 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7026
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x2fc/0x4e0 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+0x979/0x5670 fs/coredump.c:1131
 get_signal+0x22e1/0x26d0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x8f/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x85/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f272c78f6c9
RSP: 002b:00007f272d5980e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f272c9e5fa8 RCX: 00007f272c78f6c9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f272c9e5fac
RBP: 00007f272c9e5fa0 R08: 00007f272d599000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f272c9e6038 R14: 00007ffe6df1d8f0 R15: 00007ffe6df1d9d8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e3c45a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e3c45a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #0: ffffffff8e3c45a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/5591:
 #0: ffff88814df250a0 (&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+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by syz.0.17/5991:
6 locks held by syz.1.24/6037:
1 lock held by syz.2.26/6063:
1 lock held by syz.3.27/6087:
1 lock held by syz.4.50/6176:
1 lock held by syz.5.54/6214:
1 lock held by syz.6.61/6264:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
 watchdog+0xf3f/0x1170 kernel/hung_task.c:495
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6176 Comm: syz.4.50 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:sha256_transform_rorx+0x1049/0x1110 lib/crypto/x86/sha256-avx2-asm.S:660
Code: f8 01 f0 48 83 c7 40 48 81 ff 00 02 00 00 0f 82 dd fc ff ff 48 8b bc 24 10 02 00 00 48 8b b4 24 08 02 00 00 48 83 c6 40 03 07 <89> 07 03 5f 04 89 5f 04 03 4f 08 89 4f 08 44 03 47 0c 44 89 47 0c
RSP: 0018:ffffc90002f77120 EFLAGS: 00000216
RAX: 000000003fe94905 RBX: 00000000f938c1f4 RCX: 000000008749ca75
RDX: 00000000e6becbc4 RSI: ffff888060c18d00 RDI: ffffc90002f774b0
RBP: ffffc90002f77338 R08: 00000000a1f498c7 R09: 0000000046c913a2
R10: 00000000b7422375 R11: 0000000006fb6d72 R12: 00000000a13080c4
R13: 0000000099da2c4f R14: 00000000d2ee2a5f R15: 00000000a04c9bbf
FS:  00007f46eb7bf6c0(0000) GS:ffff888124a0d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000007 CR3: 000000002f734000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 sha256_blocks_avx2+0x49/0x80 lib/crypto/x86/sha256.h:31
 sha256_blocks lib/crypto/x86/sha256.h:37 [inline]
 __sha256_update+0x123/0x140 lib/crypto/sha256.c:207
 crypto_sha256_update+0x23/0x30 crypto/sha256.c:142
 crypto_shash_finup+0x360/0x6d0 crypto/shash.c:123
 crypto_shash_update include/crypto/hash.h:1006 [inline]
 ima_calc_file_hash_tfm+0x297/0x350 security/integrity/ima/ima_crypto.c:491
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline]
 ima_calc_file_hash+0x1ba/0x490 security/integrity/ima/ima_crypto.c:568
 ima_collect_measurement+0x8a6/0xa50 security/integrity/ima/ima_api.c:293
 process_measurement+0x11fa/0x23e0 security/integrity/ima/ima_main.c:405
 ima_file_mmap+0x1b1/0x1d0 security/integrity/ima/ima_main.c:495
 security_mmap_file+0x88c/0x990 security/security.c:3051
 vm_mmap_pgoff+0xec/0x470 mm/util.c:575
 ksys_mmap_pgoff+0x1c8/0x5c0 mm/mmap.c:604
 __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+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46ea98f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f46eb7bf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f46eabe6090 RCX: 00007f46ea98f6c9
RDX: 00004000000000df RSI: 0100000000000004 RDI: 0000000000000000
RBP: 00007f46eaa11f91 R08: 0000000000000004 R09: 0000300000000000
R10: 0000000000040eb2 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46eabe6128 R14: 00007f46eabe6090 R15: 00007ffe914b7e28
 </TASK>