------------[ cut here ]------------ VFS: brelse: Trying to free free buffer WARNING: CPU: 1 PID: 6631 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline] WARNING: CPU: 1 PID: 6631 at fs/buffer.c:1229 brelse include/linux/buffer_head.h:324 [inline] WARNING: CPU: 1 PID: 6631 at fs/buffer.c:1229 __invalidate_bh_lrus fs/buffer.c:1498 [inline] WARNING: CPU: 1 PID: 6631 at fs/buffer.c:1229 invalidate_bh_lru+0x128/0x200 fs/buffer.c:1511 Modules linked in: CPU: 1 UID: 0 PID: 6631 Comm: syz.4.25 Tainted: G W 6.13.0-rc6-syzkaller-g6251d1776bc5 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __brelse fs/buffer.c:1229 [inline] pc : brelse include/linux/buffer_head.h:324 [inline] pc : __invalidate_bh_lrus fs/buffer.c:1498 [inline] pc : invalidate_bh_lru+0x128/0x200 fs/buffer.c:1511 lr : __brelse fs/buffer.c:1229 [inline] lr : brelse include/linux/buffer_head.h:324 [inline] lr : __invalidate_bh_lrus fs/buffer.c:1498 [inline] lr : invalidate_bh_lru+0x128/0x200 fs/buffer.c:1511 sp : ffff800080017360 x29: ffff800080017360 x28: 0000000000000001 x27: ffff0000eeb90010 x26: 0000000000000001 x25: 00000000ffffffff x24: ffff0001b3817998 x23: 0000000000000010 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000f11bea58 x19: ffff80008b842120 x18: 0000000000000008 x17: 0000000000000000 x16: ffff8000832776d4 x15: 0000000000000001 x14: 1fffe00036700eea x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000010103 x10: 0000000000ff0100 x9 : e0775d6991a13100 x8 : e0775d6991a13100 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800080016a98 x4 : ffff80008fa90460 x3 : ffff80008073e590 x2 : 0000000000000001 x1 : 0000000000010101 x0 : 0000000000000000 Call trace: __brelse fs/buffer.c:1229 [inline] (P) brelse include/linux/buffer_head.h:324 [inline] (P) __invalidate_bh_lrus fs/buffer.c:1498 [inline] (P) invalidate_bh_lru+0x128/0x200 fs/buffer.c:1511 (P) csd_do_func kernel/smp.c:134 [inline] __flush_smp_call_function_queue+0x520/0x20b4 kernel/smp.c:540 generic_smp_call_function_single_interrupt+0x18/0x24 kernel/smp.c:457 do_handle_IPI arch/arm64/kernel/smp.c:968 [inline] ipi_handler+0x1d8/0x7d4 arch/arm64/kernel/smp.c:1016 handle_percpu_devid_irq+0x174/0x308 kernel/irq/chip.c:942 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq_desc kernel/irq/irqdesc.c:714 [inline] generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:770 __gic_handle_irq drivers/irqchip/irq-gic-v3.c:865 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:916 [inline] gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:960 do_interrupt_handler+0xe0/0x138 arch/arm64/kernel/entry-common.c:312 __el1_irq arch/arm64/kernel/entry-common.c:560 [inline] el1_interrupt+0x34/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __sanitizer_cov_trace_pc+0x0/0x84 kernel/audit_tree.c:174 (P) __netif_receive_skb_one_core net/core/dev.c:5672 [inline] __netif_receive_skb+0x114/0x3c8 net/core/dev.c:5787 process_backlog+0x640/0x123c net/core/dev.c:6119 __napi_poll+0xb4/0x3fc net/core/dev.c:6885 napi_poll net/core/dev.c:6954 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:7076 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 __do_softirq+0x14/0x20 kernel/softirq.c:595 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:442 [inline] __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:662 irq_exit_rcu+0x14/0x84 kernel/softirq.c:678 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 preempt_count arch/arm64/include/asm/preempt.h:13 [inline] (P) check_kcov_mode kernel/kcov.c:183 [inline] (P) __sanitizer_cov_trace_pc+0x14/0x84 kernel/kcov.c:217 (P) shmem_acct_blocks mm/shmem.c:213 [inline] shmem_inode_acct_blocks+0xc8/0x3c8 mm/shmem.c:229 shmem_alloc_and_add_folio+0xc50/0x1564 mm/shmem.c:1868 shmem_get_folio_gfp+0x554/0x1790 mm/shmem.c:2358 shmem_get_folio mm/shmem.c:2464 [inline] shmem_write_begin+0x140/0x488 mm/shmem.c:3120 generic_perform_write+0x29c/0x868 mm/filemap.c:4046 shmem_file_write_iter+0x110/0x138 mm/shmem.c:3296 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x920/0xcf4 fs/read_write.c:679 ksys_write+0x15c/0x26c fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:739 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 66537 hardirqs last enabled at (66536): [] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234 hardirqs last disabled at (66537): [] __el1_irq arch/arm64/kernel/entry-common.c:557 [inline] hardirqs last disabled at (66537): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:575 softirqs last enabled at (62810): [] softirq_handle_end kernel/softirq.c:407 [inline] softirqs last enabled at (62810): [] handle_softirqs+0xb44/0xd34 kernel/softirq.c:589 softirqs last disabled at (66495): [] __do_softirq+0x14/0x20 kernel/softirq.c:595 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun