INFO: task syz.2.552:7917 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.552 state:D stack:28008 pid:7917 tgid:7913 ppid:6590 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_read_slowpath+0x552/0x880 kernel/locking/rwsem.c:1084
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x98/0x2e0 kernel/locking/rwsem.c:1526
filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
page_cache_ra_order+0x445/0xc70 mm/readahead.c:491
do_sync_mmap_readahead+0x4b5/0x5f0 mm/filemap.c:3271
filemap_fault+0x62a/0x1200 mm/filemap.c:3412
__do_fault+0x135/0x390 mm/memory.c:5189
do_read_fault mm/memory.c:5610 [inline]
do_fault mm/memory.c:5744 [inline]
do_pte_missing mm/memory.c:4251 [inline]
handle_pte_fault mm/memory.c:6089 [inline]
__handle_mm_fault+0x37ed/0x5620 mm/memory.c:6232
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6401
do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0xb7/0x290 lib/strncpy_from_user.c:130
Code: 00 00 4c 89 f6 e8 69 9f cb fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 e4 4c 89 fb <4f> 8b 34 27 48 b8 ff fe fe fe fe fe fe fe 4d 8d 3c 06 4d 89 f5 49
RSP: 0018:ffffc9000d8e7d30 EFLAGS: 00050246
RAX: ffffffff84f4c1e7 RBX: 0000200000001000 RCX: ffff888033025a00
RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000007
RBP: fffffffffffffff8 R08: ffff88807f4253ff R09: 1ffff1100fe84a7f
R10: dffffc0000000000 R11: ffffed100fe84a80 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000fe0 R15: 0000200000001000
getname_flags+0xf3/0x540 fs/namei.c:157
getname include/linux/fs.h:2903 [inline]
do_sys_openat2+0xbc/0x1c0 fs/open.c:1431
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fecc678e169
RSP: 002b:00007fecc7618038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fecc69b5fa0 RCX: 00007fecc678e169
RDX: 0000000000048882 RSI: 0000200000001000 RDI: ffffffffffffff9c
RBP: 00007fecc6810a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fecc69b5fa0 R15: 00007ffe2c5dd8b8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by kworker/u8:7/1327:
3 locks held by kworker/u8:9/3511:
1 lock held by udevd/5206:
2 locks held by getty/5598:
#0: ffff888030ae30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz.3.19/6704:
1 lock held by syz.2.552/7917:
#0: ffff888022d059c0 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
#0: ffff888022d059c0 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x445/0xc70 mm/readahead.c:491
4 locks held by syz-executor/13879:
1 lock held by syz.6.3320/13940:
#0: ffff888022d059c0 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
#0: ffff888022d059c0 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x445/0xc70 mm/readahead.c:491
1 lock held by syz-executor/14601:
1 lock held by syz.4.4006/15461:
#0: ffff888022d059c0 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
#0: ffff888022d059c0 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x445/0xc70 mm/readahead.c:491
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16234 Comm: syz-executor Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:218 [inline]
RIP: 0010:unwind_next_frame+0x247/0x2390 arch/x86/kernel/unwind_orc.c:494
Code: 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d 2c 85 f0 b8 db 90 48 89 e8 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 1c 1c 00 00 44 8b 45 00 <41> ff c0 4a 8d 04 6d 00 00 00 00 4c 01 e8 48 8d 34 45 3c 2c 27 90
RSP: 0018:ffffc9000d0ef7f8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 4c3d527d1fd69000
RDX: 00000000000a6873 RSI: ffffffff8be27220 RDI: ffffffff8be271e0
RBP: ffffffff90de5600 R08: 0000000000021c9e R09: ffffffff81729e15
R10: ffffc9000d0ef918 R11: ffffffff81acf710 R12: ffffffff81a74381
R13: 0000000000021c9e R14: ffffc9000d0ef8c8 R15: 000000000000a743
FS: 000055556be48500(0000) GS:ffff888125c5c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556be635c8 CR3: 0000000032dda000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
__call_rcu_common kernel/rcu/tree.c:3090 [inline]
call_rcu+0x142/0x990 kernel/rcu/tree.c:3210
__dentry_kill+0x4d2/0x660 fs/dcache.c:688
dput+0x19f/0x2b0 fs/dcache.c:911
do_unlinkat+0x360/0x560 fs/namei.c:4653
__do_sys_unlink fs/namei.c:4696 [inline]
__se_sys_unlink fs/namei.c:4694 [inline]
__x64_sys_unlink+0x47/0x50 fs/namei.c:4694
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f95a418d717
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007fff5da32b38 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f95a418d717
RDX: 00007fff5da32b60 RSI: 00007fff5da32bf0 RDI: 00007fff5da32bf0
RBP: 00007fff5da32bf0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff5da33c80
R13: 00007f95a4210854 R14: 00000000000552b3 R15: 00007fff5da33cc0