------------[ cut here ]------------ WARNING: CPU: 1 PID: 6042 at mm/slab_common.c:936 free_large_kmalloc+0x34/0x138 mm/slab_common.c:937 Modules linked in: CPU: 1 PID: 6042 Comm: syz-executor.2 Not tainted 6.2.0-syzkaller-18302-g596b6b709632 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : free_large_kmalloc+0x34/0x138 mm/slab_common.c:937 lr : kfree+0x17c/0x220 mm/slab_common.c:1014 sp : ffff80001e677710 x29: ffff80001e677710 x28: ffff0000e601e0b0 x27: ffff0000e601f330 x26: ffff0000caa6b228 x25: ffff0000caa6b220 x24: 0000000000000000 x23: ffff0000e6018430 x22: dfff800000000000 x21: ffff800008813314 x20: ffff0000cef40000 x19: fffffc00033bd000 x18: 1fffe0003689f976 x17: ffff800015b8d000 x16: ffff80000830fe44 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000406 x12: ffff0000d16451c0 x11: ff8080000809b054 x10: 0000000000000000 x9 : 05ffc00000000000 x8 : ffff80001856d000 x7 : ffff800008775530 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : ffff0000cef40000 x0 : fffffc00033bd000 Call trace: free_large_kmalloc+0x34/0x138 mm/slab_common.c:937 kfree+0x17c/0x220 mm/slab_common.c:1014 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x2f0 fs/super.c:492 kill_block_super+0x70/0xdc fs/super.c:1386 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1291 __cleanup_mnt+0x20/0x30 fs/namespace.c:1298 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1302 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 irq event stamp: 10909890 hardirqs last enabled at (10909889): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (10909889): [] _raw_spin_unlock_irqrestore+0x44/0xa4 kernel/locking/spinlock.c:194 hardirqs last disabled at (10909890): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (10909206): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (10909204): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- object pointer: 0x00000000525259a6 ================================================================== BUG: KASAN: double-free in kfree+0x17c/0x220 mm/slab_common.c:1014 Free of addr ffff0000cef40000 by task syz-executor.2/6042 CPU: 1 PID: 6042 Comm: syz-executor.2 Tainted: G W 6.2.0-syzkaller-18302-g596b6b709632 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:417 kasan_report_invalid_free+0xc4/0x114 mm/kasan/report.c:482 __kasan_kfree_large+0xa4/0xc0 mm/kasan/common.c:272 kasan_kfree_large include/linux/kasan.h:185 [inline] free_large_kmalloc+0x70/0x138 mm/slab_common.c:940 kfree+0x17c/0x220 mm/slab_common.c:1014 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x2f0 fs/super.c:492 kill_block_super+0x70/0xdc fs/super.c:1386 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1291 __cleanup_mnt+0x20/0x30 fs/namespace.c:1298 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1302 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the physical page: page:0000000055c1a0b6 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x10ef40 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0003908608 fffffc0003772008 0000000000000000 raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cef3ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000cef3ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000cef40000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000cef40080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000cef40100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== page:0000000055c1a0b6 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x10ef40 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0003908608 fffffc0003772008 0000000000000000 raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:766! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 6042 Comm: syz-executor.2 Tainted: G B W 6.2.0-syzkaller-18302-g596b6b709632 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : put_page_testzero include/linux/mm.h:766 [inline] pc : __free_pages+0x15c/0x1cc mm/page_alloc.c:5637 lr : put_page_testzero include/linux/mm.h:766 [inline] lr : __free_pages+0x15c/0x1cc mm/page_alloc.c:5637 sp : ffff80001e6776d0 x29: ffff80001e6776d0 x28: ffff0000e601e0b0 x27: ffff0000e601f330 x26: ffff0000caa6b228 x25: ffff0000caa6b220 x24: 0000000000000000 x23: dfff800000000000 x22: 05ffc00000000000 x21: fffffc00033bd034 x20: 0000000000000000 x19: fffffc00033bd000 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80001235d16c x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: ff80800008837208 x10: 0000000000000000 x9 : ffff800008837208 x8 : ffff0000d16451c0 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001e676f58 x4 : ffff800015c74760 x3 : ffff800008596744 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000003e Call trace: put_page_testzero include/linux/mm.h:766 [inline] __free_pages+0x15c/0x1cc mm/page_alloc.c:5637 free_large_kmalloc+0xd4/0x138 mm/slab_common.c:945 kfree+0x17c/0x220 mm/slab_common.c:1014 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x2f0 fs/super.c:492 kill_block_super+0x70/0xdc fs/super.c:1386 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1291 __cleanup_mnt+0x20/0x30 fs/namespace.c:1298 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1302 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Code: f004e4a1 911f0021 aa1303e0 97fdd915 (d4210000) ---[ end trace 0000000000000000 ]---