syzbot

INFO: task syz-executor334:4247 blocked for more than 143 seconds.
      Not tainted 6.1.131-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor334 state:D stack:24120 pid:4247  ppid:4246   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5243 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6560
 schedule+0xbf/0x180 kernel/sched/core.c:6636
 io_schedule+0x88/0x100 kernel/sched/core.c:8788
 folio_wait_bit_common+0x878/0x1290 mm/filemap.c:1324
 lock_page include/linux/pagemap.h:995 [inline]
 pickup_page_for_submission fs/erofs/zdata.c:1348 [inline]
 z_erofs_submit_queue fs/erofs/zdata.c:1541 [inline]
 z_erofs_runqueue+0xa59/0x1e10 fs/erofs/zdata.c:1613
 z_erofs_readahead+0xc26/0x1030 fs/erofs/zdata.c:1760
 read_pages+0x17f/0x830 mm/readahead.c:161
 page_cache_ra_unbounded+0x68b/0x7b0 mm/readahead.c:270
 do_page_cache_ra mm/readahead.c:300 [inline]
 force_page_cache_ra+0x2a3/0x300 mm/readahead.c:331
 force_page_cache_readahead mm/internal.h:125 [inline]
 generic_fadvise+0x553/0x7b0 mm/fadvise.c:107
 vfs_fadvise mm/fadvise.c:185 [inline]
 ksys_fadvise64_64 mm/fadvise.c:199 [inline]
 __do_sys_fadvise64 mm/fadvise.c:214 [inline]
 __se_sys_fadvise64 mm/fadvise.c:212 [inline]
 __x64_sys_fadvise64+0x138/0x180 mm/fadvise.c:212
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f293080f119
RSP: 002b:00007fffba1d9bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000dd
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f293080f119
RDX: 000000000000ff39 RSI: 000000000000aa1f RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fffba1d9bf0
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fffba1d9bf0
R13: 00007fffba1d9e78 R14: 431bde82d7b634db R15: 00007f293085803b
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d32e890 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d32f090 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
 #0: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
2 locks held by getty/4016:
 #0: ffff88814cce3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x54a/0x1620 drivers/tty/n_tty.c:2198
1 lock held by syz-executor334/4247:
 #0: ffff888071240338 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline]
 #0: ffff888071240338 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xed/0x7b0 mm/readahead.c:226

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1ca/0x430 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf88/0xfd0 kernel/hung_task.c:377
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3612 Comm: klogd Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:mmdrop include/linux/sched/mm.h:49 [inline]
RIP: 0010:mmdrop_sched include/linux/sched/mm.h:78 [inline]
RIP: 0010:finish_task_switch+0x2a1/0x810 kernel/sched/core.c:5147
Code: 85 d9 01 00 00 f7 03 20 00 00 00 0f 85 15 01 00 00 49 8d be 90 00 00 00 be 04 00 00 00 e8 27 9a 82 00 f0 41 ff 8e 90 00 00 00 <74> 22 81 7d b8 80 00 00 00 74 2a 48 83 c4 20 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003297948 EFLAGS: 00000202
RAX: 1ffff1100f9be801 RBX: ffff88807cdf51d8 RCX: ffffffff815f7279
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888031dfe990
RBP: ffffc90003297990 R08: dffffc0000000000 R09: ffffed10063bfd33
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807cdf40a8
R13: dffffc0000000000 R14: ffff888031dfe900 R15: ffff88801fedd940
FS:  00007f7292428380(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005578a2c51600 CR3: 000000007e658000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x1447/0x4570 kernel/sched/core.c:6560
 schedule+0xbf/0x180 kernel/sched/core.c:6636
 syslog_print+0x270/0x620 kernel/printk/printk.c:1526
 do_syslog+0x819/0x910 kernel/printk/printk.c:1679
 __do_sys_syslog kernel/printk/printk.c:1771 [inline]
 __se_sys_syslog kernel/printk/printk.c:1769 [inline]
 __x64_sys_syslog+0x78/0x90 kernel/printk/printk.c:1769
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7292589fa7
Code: 73 01 c3 48 8b 0d 81 ce 0c 00 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 67 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 ce 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007fff300d6388 EFLAGS: 00000206 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007f72927284a0 RCX: 00007f7292589fa7
RDX: 00000000000003ff RSI: 00007f72927284a0 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000007 R09: a6d29bc7ec9a0e3f
R10: 0000000000004000 R11: 0000000000000206 R12: 00007f72927284a0
R13: 00007f7292718212 R14: 00007f7292728550 R15: 00007f7292728550
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.279 msecs