------------[ cut here ]------------ VFS: brelse: Trying to free free buffer WARNING: CPU: 1 PID: 6251 at fs/buffer.c:1235 __brelse fs/buffer.c:1235 [inline] WARNING: CPU: 1 PID: 6251 at fs/buffer.c:1235 brelse include/linux/buffer_head.h:309 [inline] WARNING: CPU: 1 PID: 6251 at fs/buffer.c:1235 __invalidate_bh_lrus fs/buffer.c:1487 [inline] WARNING: CPU: 1 PID: 6251 at fs/buffer.c:1235 invalidate_bh_lru+0x128/0x200 fs/buffer.c:1500 Modules linked in: CPU: 1 PID: 6251 Comm: udevd Not tainted 6.9.0-rc3-syzkaller-gb5d2afe8745b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __brelse fs/buffer.c:1235 [inline] pc : brelse include/linux/buffer_head.h:309 [inline] pc : __invalidate_bh_lrus fs/buffer.c:1487 [inline] pc : invalidate_bh_lru+0x128/0x200 fs/buffer.c:1500 lr : __brelse fs/buffer.c:1235 [inline] lr : brelse include/linux/buffer_head.h:309 [inline] lr : __invalidate_bh_lrus fs/buffer.c:1487 [inline] lr : invalidate_bh_lru+0x128/0x200 fs/buffer.c:1500 sp : ffff800080017e10 x29: ffff800080017e10 x28: ffff80008ee7d568 x27: 0000000000000000 x26: 0000000000000001 x25: 00000000ffffffff x24: ffff0001b3e00fd0 x23: 0000000000000000 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000eff137a0 x19: ffff80008b0bba00 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008ae71340 x15: 0000000000000001 x14: 1fffe000367be202 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000010004 x10: 0000000000ff0100 x9 : e6e5544d3aa0f400 x8 : e6e5544d3aa0f400 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800080017578 x4 : ffff80008ef65060 x3 : ffff8000805e9200 x2 : 0000000000000001 x1 : 0000000100010002 x0 : 0000000000000000 Call trace: __brelse fs/buffer.c:1235 [inline] brelse include/linux/buffer_head.h:309 [inline] __invalidate_bh_lrus fs/buffer.c:1487 [inline] invalidate_bh_lru+0x128/0x200 fs/buffer.c:1500 csd_do_func kernel/smp.c:133 [inline] __flush_smp_call_function_queue+0x534/0x20cc kernel/smp.c:511 generic_smp_call_function_single_interrupt+0x18/0x24 kernel/smp.c:428 do_handle_IPI arch/arm64/kernel/smp.c:900 [inline] ipi_handler+0x1e0/0x7dc arch/arm64/kernel/smp.c:950 handle_percpu_devid_irq+0x174/0x308 kernel/irq/chip.c:942 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq_desc kernel/irq/irqdesc.c:688 [inline] generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:744 __gic_handle_irq drivers/irqchip/irq-gic-v3.c:771 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:822 [inline] gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:866 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:310 __el1_irq arch/arm64/kernel/entry-common.c:536 [inline] el1_interrupt+0x34/0x68 arch/arm64/kernel/entry-common.c:551 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irq+0x34/0x80 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:401 [inline] loop_queue_work drivers/block/loop.c:883 [inline] loop_queue_rq+0x97c/0xadc drivers/block/loop.c:1874 __blk_mq_issue_directly block/blk-mq.c:2595 [inline] blk_mq_request_issue_directly+0x31c/0x568 block/blk-mq.c:2680 blk_mq_plug_issue_direct+0x200/0x4ec block/blk-mq.c:2701 blk_mq_flush_plug_list+0x648/0x1348 block/blk-mq.c:2810 __blk_flush_plug+0x388/0x444 block/blk-core.c:1188 blk_finish_plug+0x68/0x90 block/blk-core.c:1214 read_pages+0x4f8/0x694 mm/readahead.c:183 page_cache_ra_unbounded+0x460/0x560 mm/readahead.c:269 do_page_cache_ra mm/readahead.c:299 [inline] force_page_cache_ra+0x240/0x2a8 mm/readahead.c:330 page_cache_sync_ra+0x110/0x180 mm/readahead.c:684 page_cache_sync_readahead include/linux/pagemap.h:1300 [inline] filemap_get_pages+0x368/0x1630 mm/filemap.c:2505 filemap_read+0x350/0xc84 mm/filemap.c:2601 blkdev_read_iter+0x27c/0x3ac block/fops.c:754 call_read_iter include/linux/fs.h:2104 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0x78c/0x954 fs/read_write.c:476 ksys_read+0x15c/0x26c fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:627 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 423434 hardirqs last enabled at (423433): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (423433): [] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:202 hardirqs last disabled at (423434): [] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline] hardirqs last disabled at (423434): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551 softirqs last enabled at (423404): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (423402): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun