Test for 6ed94e81a1492fe1d512

[Shigeru Yoshida]

#syz test

diff --git a/net/9p/client.c b/net/9p/client.c
index f0dcf252af7e..73098249f379 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -599,7 +599,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
smp_rmb();

if (err == -ERESTARTSYS && c->status == Connected &&
- type == P9_TFLUSH) {
+ type == P9_TFLUSH && !fatal_signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
goto again;

[Shigeru Yoshida]

#syz test

diff --git a/net/9p/client.c b/net/9p/client.c

index f0dcf252af7e..28742f19041e 100644

--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -599,7 +599,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
smp_rmb();

if (err == -ERESTARTSYS && c->status == Connected &&
- type == P9_TFLUSH) {
+ type == P9_TFLUSH && !fatal_signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
goto again;

@@ -609,7 +609,8 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
- if (err == -ERESTARTSYS && c->status == Connected) {
+ if (err == -ERESTARTSYS && c->status == Connected &&
+ !fatal_signal_pending(current)) {
p9_debug(P9_DEBUG_MUX, "flushing\n");
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
@@ -694,7 +695,8 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
- if (err == -ERESTARTSYS && c->status == Connected) {
+ if (err == -ERESTARTSYS && c->status == Connected &&
+ !fatal_signal_pending(current)) {
p9_debug(P9_DEBUG_MUX, "flushing\n");
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);

[syzbot]

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:
<TASK>
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
</TASK>

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:
<TASK>
__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
</TASK>
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:
<TASK>
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
</TASK>


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

[syzbot]

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:
<TASK>
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

</TASK>

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:
<TASK>
__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
</TASK>
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:
<TASK>
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

</TASK>


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

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+6ed94e...@syzkaller.appspotmail.com
Tested-by: syzbot+6ed94e...@syzkaller.appspotmail.com

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=164966da580000

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=10b166da580000

Note: testing is done by a robot and is best-effort only.