general protection fault, probably for non-canonical address 0xdffffc0000000034: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7] CPU: 0 PID: 20675 Comm: syz-executor.4 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_multicast_to_unicast net/mac80211/tx.c:4070 [inline] RIP: 0010:ieee80211_subif_start_xmit+0x24e/0xee0 net/mac80211/tx.c:4154 Code: 03 80 3c 02 00 0f 85 83 0c 00 00 49 8b 9f 50 17 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb a4 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 58 0c 00 00 RSP: 0018:ffffc90000007588 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8851c61d RDX: 0000000000000034 RSI: ffffffff8851c6ad RDI: 00000000000001a4 RBP: ffff88802094f780 R08: 0000000000000000 R09: ffffffff8cecb9cf R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8a61f1e0 R13: ffff88805ccc7042 R14: 000000000000005a R15: ffff888025b50000 FS: 00007f6f428da700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000050a390 CR3: 0000000013715000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __netdev_start_xmit include/linux/netdevice.h:4718 [inline] netdev_start_xmit include/linux/netdevice.h:4732 [inline] xmit_one net/core/dev.c:3564 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3580 sch_direct_xmit+0x2e1/0xbd0 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4ba/0x15e0 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:131 [inline] qdisc_run include/net/pkt_sched.h:123 [inline] __dev_xmit_skb net/core/dev.c:3755 [inline] __dev_queue_xmit+0x1453/0x2da0 net/core/dev.c:4108 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0x8db/0x16c0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] mld_sendpack+0x92a/0xdb0 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x60a/0xf10 net/ipv6/mcast.c:2474 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:91 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:108 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:183 [inline] RIP: 0010:check_memory_region+0xde/0x180 mm/kasan/generic.c:192 Code: 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00 <74> f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c 2c eb 0c RSP: 0018:ffffc90008067498 EFLAGS: 00000246 RAX: ffffed100c03e942 RBX: ffffed100c03e943 RCX: ffffffff8204dd69 RDX: ffffed100c03e943 RSI: 0000000000000004 RDI: ffff8880601f4a10 RBP: ffffed100c03e942 R08: 0000000000000001 R09: ffff8880601f4a13 R10: ffffed100c03e942 R11: 0000000000000000 R12: 0000000000007fff R13: ffff888021a3c000 R14: ffff88802e9af840 R15: ffffc90008067868 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_dec_and_test include/asm-generic/atomic-instrumented.h:748 [inline] ext4_mb_pa_free+0x49/0x90 fs/ext4/mballoc.c:4471 ext4_mb_new_blocks+0x3d1d/0x4fb0 fs/ext4/mballoc.c:5012 ext4_ext_map_blocks+0x1fc1/0x5eb0 fs/ext4/extents.c:4238 ext4_map_blocks+0x64f/0x1770 fs/ext4/inode.c:628 ext4_alloc_file_blocks.isra.0+0x2ef/0xac0 fs/ext4/extents.c:4426 ext4_fallocate+0x406/0x3eb0 fs/ext4/extents.c:4705 vfs_fallocate+0x48d/0xd70 fs/open.c:309 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:494 file_ioctl fs/ioctl.c:534 [inline] do_vfs_ioctl+0xdf9/0x1090 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6f428d9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000013300 RCX: 000000000045deb9 RDX: 0000000020000040 RSI: 000000004030582a RDI: 0000000000000004 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fff2f38f8ef R14: 00007f6f428da9c0 R15: 000000000118bf2c Modules linked in: ---[ end trace 1f0f5dab8c56d1bf ]--- RIP: 0010:ieee80211_multicast_to_unicast net/mac80211/tx.c:4070 [inline] RIP: 0010:ieee80211_subif_start_xmit+0x24e/0xee0 net/mac80211/tx.c:4154 Code: 03 80 3c 02 00 0f 85 83 0c 00 00 49 8b 9f 50 17 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb a4 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 58 0c 00 00 RSP: 0018:ffffc90000007588 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8851c61d RDX: 0000000000000034 RSI: ffffffff8851c6ad RDI: 00000000000001a4 RBP: ffff88802094f780 R08: 0000000000000000 R09: ffffffff8cecb9cf R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8a61f1e0 R13: ffff88805ccc7042 R14: 000000000000005a R15: ffff888025b50000 FS: 00007f6f428da700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000050a390 CR3: 0000000013715000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400