INFO: task syz-executor.0:9300 blocked for more than 143 seconds. Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26688 pid:9300 tgid:9293 ppid:7307 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1250 [inline] __down_read kernel/locking/rwsem.c:1263 [inline] down_read+0x124/0x330 kernel/locking/rwsem.c:1528 inode_lock_shared include/linux/fs.h:805 [inline] lookup_slow fs/namei.c:1708 [inline] walk_component+0x342/0x5b0 fs/namei.c:2004 link_path_walk.part.0.constprop.0+0x77f/0xcd0 fs/namei.c:2331 link_path_walk fs/namei.c:2256 [inline] path_openat+0x22f/0x2990 fs/namei.c:3795 do_filp_open+0x1dc/0x430 fs/namei.c:3826 do_sys_openat2+0x17a/0x1e0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f72b047dea9 RSP: 002b:00007f72b111d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f72b05ac120 RCX: 00007f72b047dea9 RDX: 0000000000000000 RSI: 0000000020000680 RDI: ffffffffffffff9c RBP: 00007f72b04ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f72b05ac120 R15: 00007fffa6896ae8 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 6 locks held by kworker/u8:5/140: 2 locks held by kworker/u8:8/2478: 2 locks held by getty/4832: #0: ffff88802a5950a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201 2 locks held by kworker/1:4/5140: 2 locks held by syz-executor.0/9297: 1 lock held by syz-executor.0/9300: #0: ffff888076810188 (&type->i_mutex_dir_key#24){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:805 [inline] #0: ffff888076810188 (&type->i_mutex_dir_key#24){++++}-{3:3}, at: lookup_slow fs/namei.c:1708 [inline] #0: ffff888076810188 (&type->i_mutex_dir_key#24){++++}-{3:3}, at: walk_component+0x342/0x5b0 fs/namei.c:2004 2 locks held by syz-executor.1/11334: 1 lock held by syz-executor.3/11369: 2 locks held by syz-executor.0/11377: 1 lock held by syz-executor.4/11398: 2 locks held by syz-executor.2/11401: #0: ffffffff8f301588 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f301588 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xe60 net/core/rtnetlink.c:6592 #1: ffffffff8d7bc538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #1: ffffffff8d7bc538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x682/0x7a0 kernel/rcu/tree_exp.h:939 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 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:223 [inline] watchdog+0xf86/0x1240 kernel/hung_task.c:380 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11334 Comm: syz-executor.1 Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x20 kernel/kcov.c:283 Code: 0c 24 89 f2 89 fe bf 04 00 00 00 e9 ea fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 0c 24 48 89 f2 48 89 fe bf 06 00 00 00 e9 b8 fe RSP: 0018:ffffc90003ccee58 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff8fb7f4b8 RCX: 0000000000000000 RDX: fffffffff230de50 RSI: ffffffff81e8d310 RDI: ffffffff81e8d363 RBP: ffffffff8fb7f4cc R08: 0000000000000006 R09: ffffffff81e8d363 R10: ffffffff81e8d378 R11: 0000000000000000 R12: ffffffff81e8d363 R13: ffffffff81e8d310 R14: dffffc0000000000 R15: ffffffff8fb7f4c0 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa34252f000 CR3: 000000005c68e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __orc_find+0xc4/0x130 arch/x86/kernel/unwind_orc.c:102 orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x335/0x23a0 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x12e/0x380 mm/slub.c:4344 free_buffer_head+0x4e/0x110 fs/buffer.c:3017 try_to_free_buffers+0x1c5/0x2d0 fs/buffer.c:2958 jbd2_journal_try_to_free_buffers+0x1fa/0x270 fs/jbd2/transaction.c:2182 ext4_release_folio+0x1a5/0x3b0 fs/ext4/inode.c:3192 filemap_release_folio+0x1ed/0x280 mm/filemap.c:4132 block_invalidate_folio+0x4e9/0x5e0 fs/buffer.c:1633 folio_invalidate mm/truncate.c:158 [inline] truncate_cleanup_folio+0x2ac/0x3e0 mm/truncate.c:178 truncate_inode_pages_range+0x271/0xe90 mm/truncate.c:358 ext4_evict_inode+0x2cc/0x17d0 fs/ext4/inode.c:193 evict+0x2ed/0x6c0 fs/inode.c:667 iput_final fs/inode.c:1741 [inline] iput.part.0+0x5a8/0x7f0 fs/inode.c:1767 iput+0x5c/0x80 fs/inode.c:1757 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 dput.part.0+0x4b1/0x9b0 fs/dcache.c:845 dput+0x1f/0x30 fs/dcache.c:835 __fput+0x3bc/0xb80 fs/file_table.c:430 task_work_run+0x14e/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa7d/0x2c10 kernel/exit.c:878 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 get_signal+0x2616/0x2710 kernel/signal.c:2911 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x139/0x280 kernel/entry/common.c:231 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0xdba0c25f Code: Unable to access opcode bytes at 0xdba0c235. RSP: 002b:0000000020000348 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f75753ac050 RCX: 00007f757527dea9 RDX: 0000000020000040 RSI: 0000000020000340 RDI: 0000000091080400 RBP: 00007f75752ca4a4 R08: 0000000020000180 R09: 0000000020000180 R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000006e R14: 00007f75753ac050 R15: 00007ffea167c798