INFO: task syz-executor.0:14235 blocked for more than 143 seconds. Not tainted 6.7.0-rc5-next-20231215-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:24592 pid:14235 tgid:14234 ppid:5093 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5399 [inline] __schedule+0xf15/0x5c80 kernel/sched/core.c:6726 __schedule_loop kernel/sched/core.c:6801 [inline] schedule+0xe7/0x270 kernel/sched/core.c:6816 wait_extent_bit fs/btrfs/extent-io-tree.c:822 [inline] lock_extent+0x656/0x730 fs/btrfs/extent-io-tree.c:1868 btrfs_page_mkwrite+0x820/0x1420 fs/btrfs/inode.c:8176 do_page_mkwrite+0x17a/0x380 mm/memory.c:2959 wp_page_shared mm/memory.c:3346 [inline] do_wp_page+0xb00/0x3750 mm/memory.c:3486 handle_pte_fault mm/memory.c:5151 [inline] __handle_mm_fault+0x1f7c/0x48f0 mm/memory.c:5276 handle_mm_fault+0x476/0xa00 mm/memory.c:5441 do_user_addr_fault+0x3cf/0x1000 arch/x86/mm/fault.c:1413 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc9000532f8d8 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000000000038 RCX: 0000000000000038 RDX: fffff52000a65f32 RSI: ffffc9000532f958 RDI: 00000000200015e0 RBP: 00000000200015e0 R08: 0000000000000000 R09: fffff52000a65f31 R10: ffffc9000532f98f R11: 0000000000000001 R12: ffffc9000532f958 R13: 0000000020001618 R14: 0000000000000000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user lib/usercopy.c:41 [inline] _copy_to_user+0xa8/0xb0 lib/usercopy.c:34 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x232/0x380 fs/ioctl.c:145 emit_last_fiemap_cache fs/btrfs/extent_io.c:2555 [inline] extent_fiemap+0x13df/0x19f0 fs/btrfs/extent_io.c:3082 btrfs_fiemap+0xe4/0x160 fs/btrfs/inode.c:7844 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x339/0x1920 fs/ioctl.c:811 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x112/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f7e5007cba9 RSP: 002b:00007f7e50d280c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7e5019bf80 RCX: 00007f7e5007cba9 RDX: 00000000200015c0 RSI: 00000000c020660b RDI: 0000000000000004 RBP: 00007f7e50d28120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f7e5019bf80 R15: 00007fffbf407fe8 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8d1ac360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8d1ac360 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8d1ac360 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 2 locks held by kworker/u4:4/59: #0: ffff8880b983c718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558 #1: ffff8880b9828408 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988 2 locks held by getty/4820: #0: ffff88814c1720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900015e72f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc4/0x1490 drivers/tty/n_tty.c:2201 4 locks held by syz-executor.0/14235: #0: ffff88803d40de38 (&sb->s_type->i_mutex_key#25){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline] #0: ffff88803d40de38 (&sb->s_type->i_mutex_key#25){++++}-{3:3}, at: btrfs_inode_lock+0xf9/0x100 fs/btrfs/inode.c:379 #1: ffff88806cfacda0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #1: ffff88806cfacda0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5468 [inline] #1: ffff88806cfacda0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x580 mm/memory.c:5528 #2: ffff88803a860518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x380 mm/memory.c:2959 #3: ffff88803d40dcc0 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x8b1/0x1420 fs/btrfs/inode.c:8165 2 locks held by syz-executor.1/16365: 1 lock held by syz-executor.4/16381: 2 locks held by udevadm/16388: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc5-next-20231215-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf86/0x1210 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 49 Comm: kworker/u4:3 Not tainted 6.7.0-rc5-next-20231215-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: bat_events batadv_dat_purge RIP: 0010:lock_acquire+0xf7/0x530 kernel/locking/lockdep.c:5727 Code: 37 3a 8f 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 cd 03 00 00 <8b> 0d 7b b9 d1 0d 85 c9 0f 84 e3 00 00 00 65 8b 05 9c 07 9a 7e 85 RSP: 0018:ffffc90000b9fb68 EFLAGS: 00000246 RAX: 0000000000000003 RBX: 1ffff92000173f6f RCX: 1ffffffff1e746e3 RDX: 0000000000000000 RSI: ffffffff8b2f7cc0 RDI: ffffffff8ca85a60 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1e7406a R10: ffffffff8f3a0357 R11: 0000000000000002 R12: 0000000000000001 R13: 0000000000000000 R14: ffff88803add7f18 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564b3b5abc28 CR3: 0000000086c41000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] __batadv_dat_purge.part.0+0xfa/0x3b0 net/batman-adv/distributed-arp-table.c:174 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:167 [inline] batadv_dat_purge+0x4b/0xa0 net/batman-adv/distributed-arp-table.c:205 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242