netlink: 176 bytes leftover after parsing attributes in process `syz-executor4'. BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 #PF error: [normal kernel read fault] kobject: 'loop1' (0000000047f8097d): kobject_uevent_env PGD 0 P4D 0 kobject: 'loop1' (0000000047f8097d): fill_kobj_path: path = '/devices/virtual/block/loop1' Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 23807 Comm: modprobe Not tainted 4.20.0+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:slab_equal_or_root mm/slab.h:228 [inline] RIP: 0010:cache_from_obj mm/slab.h:374 [inline] RIP: 0010:cache_from_obj mm/slab.h:356 [inline] RIP: 0010:kmem_cache_free+0x207/0x260 mm/slab.c:3752 Code: ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 49 39 c4 0f 84 19 fe ff ff <4c> 3b a0 80 00 00 00 0f 85 70 1e 00 00 49 89 c4 e9 04 fe ff ff 0f RSP: 0018:ffff8880ae707b00 EFLAGS: 00010282 kobject: 'loop0' (00000000a6a8428c): kobject_uevent_env RAX: 0000000000000000 RBX: ffff888085375780 RCX: ffff8880ae730557 kobject: 'loop0' (00000000a6a8428c): fill_kobj_path: path = '/devices/virtual/block/loop0' RDX: 0000000000000000 RSI: ffffffff8139c494 RDI: 0000000000000007 RBP: ffff8880ae707b20 R08: ffff88808ac606c0 R09: ffff88808ac60f60 R10: ffff88808ac60f40 R11: 0000000000000001 R12: ffff8880a5c31c80 R13: ffff888085375b38 R14: 1ffff11015ce0f94 R15: ffff8880ae707d20 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000000a40a5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop2' (00000000ca1e3514): kobject_uevent_env DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_i_callback+0x20/0x30 fs/ext4/super.c:1081 kobject: 'loop2' (00000000ca1e3514): fill_kobj_path: path = '/devices/virtual/block/loop2' __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0xc4a/0x1680 kernel/rcu/tree.c:2754 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:debug_lockdep_rcu_enabled+0x5e/0xa0 kernel/rcu/update.c:248 Code: 85 d2 74 3b 48 c7 c0 f4 30 5b 8a 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 04 <84> d2 75 23 8b 05 7c 2f f0 08 85 c0 74 07 e8 2f ff ff ff 5d c3 31 RSP: 0018:ffff8880953b73f8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 1ffff11012a76e82 RCX: 1ffffffff14b661e RDX: 0000000000000000 RSI: 00000000000004c8 RDI: ffffffff8853a5e0 RBP: ffff8880953b73f8 R08: ffff88808ac606c0 R09: ffffed10151804f3 R10: ffffed10151804f2 R11: ffff8880a8c02793 R12: 0000000000000000 R13: ffffffff8853a5e0 R14: 00000000000004c8 R15: dffffc0000000000 ___might_sleep+0x6e/0x310 kernel/sched/core.c:6113 zap_pud_range mm/memory.c:1224 [inline] zap_p4d_range mm/memory.c:1243 [inline] unmap_page_range+0x176d/0x25a0 mm/memory.c:1264 unmap_single_vma+0x19d/0x300 mm/memory.c:1309 unmap_vmas+0xae/0x180 mm/memory.c:1339 exit_mmap+0x2d4/0x5d0 mm/mmap.c:3156 __mmput kernel/fork.c:1050 [inline] mmput+0x240/0x640 kernel/fork.c:1071 exit_mm kernel/exit.c:545 [inline] do_exit+0x9da/0x26f0 kernel/exit.c:854 do_group_exit+0x177/0x430 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:979 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f61df5251e8 Code: Bad RIP value. RSP: 002b:00007ffc41a198d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f61df5251e8 RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00007f61df7fa840 R08: 00000000000000e7 R09: ffffffffffffffa8 R10: 00007f61df800740 R11: 0000000000000246 R12: 00007f61df7fa840 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000080 ---[ end trace 22162fcf32b9a504 ]--- RIP: 0010:slab_equal_or_root mm/slab.h:228 [inline] RIP: 0010:cache_from_obj mm/slab.h:374 [inline] RIP: 0010:cache_from_obj mm/slab.h:356 [inline] RIP: 0010:kmem_cache_free+0x207/0x260 mm/slab.c:3752 Code: ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 49 39 c4 0f 84 19 fe ff ff <4c> 3b a0 80 00 00 00 0f 85 70 1e 00 00 49 89 c4 e9 04 fe ff ff 0f RSP: 0018:ffff8880ae707b00 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff888085375780 RCX: ffff8880ae730557 RDX: 0000000000000000 RSI: ffffffff8139c494 RDI: 0000000000000007 RBP: ffff8880ae707b20 R08: ffff88808ac606c0 R09: ffff88808ac60f60 R10: ffff88808ac60f40 R11: 0000000000000001 R12: ffff8880a5c31c80 R13: ffff888085375b38 R14: 1ffff11015ce0f94 R15: ffff8880ae707d20 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f61df5251be CR3: 00000000a40a5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400