On 12/01/2014 05:49 PM, Robert Święcki wrote:
I don't have much more, cause my kernel is kASLRNized and gdb cannot handle that, but pasting output from kdb. Maybe somebody will be able to see something obvious. <0>[93699.703244] skbuff: skb_under_panic: text:ffffffff83cff03e len:104 put:56 head:ffff8803bd804ec0 data:ffff8803bd804ebc tail:0x64 end:0xc0 dev:<NULL>
Thanks for the report! On a first view, it looks like we should be using MAX_HEADER instead of LL_MAX_HEADER here, could you try with the following patch: diff --git a/net/sctp/output.c b/net/sctp/output.c index 42dffd4..fc5e45b 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -401,12 +401,12 @@ int sctp_packet_transmit(struct sctp_packet *packet) sk = chunk->skb->sk; /* Allocate the new skb. */ - nskb = alloc_skb(packet->size + LL_MAX_HEADER, GFP_ATOMIC); + nskb = alloc_skb(packet->size + MAX_HEADER, GFP_ATOMIC); if (!nskb) goto nomem; /* Make sure the outbound skb has enough header room reserved. */ - skb_reserve(nskb, packet->overhead + LL_MAX_HEADER); + skb_reserve(nskb, packet->overhead + MAX_HEADER); /* Set the owning socket so that we know where to get the * destination IP address.
[9]kdb> bt Stack traceback for pid 14150 0xffff88039c81ebf0 14150 15338 1 9 R 0xffff88039c81f0f0 *trinity-c9 ffff8805318ab4b8 0000000000000018 ffffffff83abddc4 ffff8803bd804ebc 0000000000000064 00000000000000c0 ffffffff84bc674d ffff8805318ab508 ffff8805318ab518 00000000ffffffff 0000000000000000 ffff8805318ab558 Call Trace: [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83cff03e>] ? ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac4551>] ? skb_push+0xc1/0x100 [<ffffffff83cff03e>] ? ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac8410>] ? __skb_checksum+0x110/0x730 [<ffffffff81604c92>] ? kmem_cache_free+0x1d2/0x210 [<ffffffff8437cf91>] ? sctp_v4_xmit+0x101/0x1a0 [<ffffffff843d5ba2>] ? sctp_packet_transmit+0xf32/0x2050 [<ffffffff8438fb8c>] ? sctp_chunkify+0x4c/0x2a0 [<ffffffff81622c64>] ? kasan_poison_shadow+0x34/0x40 [<ffffffff843d2a50>] ? sctp_csum_combine+0x20/0x20 [<ffffffff843d2a30>] ? sctp_packet_release_owner+0x50/0x50 [<ffffffff843a6dde>] ? sctp_outq_flush+0x6ee/0x2fa0 [<ffffffff81326b7f>] ? preempt_count_add+0x16f/0x1b0 [<ffffffff843ad8dd>] ? sctp_outq_uncork+0x6d/0x90 [<ffffffff84378765>] ? sctp_do_sm+0x2c25/0x4a40 [<ffffffff83ce2630>] ? __ip_route_output_key+0xa50/0x2830 [<ffffffff83e99011>] ? xfrm_lookup_route+0x21/0x100 [<ffffffff83ce5369>] ? ip_route_output_flow+0x69/0x90 [<ffffffff82305052>] ? extract_entropy+0xa2/0x230 [<ffffffff8437d7ff>] ? sctp_v4_get_dst+0x65f/0x1040 [<ffffffff843d2584>] ? sctp_primitive_ASSOCIATE+0x84/0xd0 [<ffffffff843c4ad6>] ? sctp_sendmsg+0x15b6/0x29b0 [<ffffffff81530000>] ? toggle_bp_slot.constprop.11+0x1d0/0x530 [<ffffffff81544636>] ? generic_perform_write+0x266/0x450 [<ffffffff83dda011>] ? inet_sendmsg+0x231/0x360 [<ffffffff83aa9e94>] ? sock_sendmsg+0xc4/0x150 [<ffffffff81681ab3>] ? __fdget+0x13/0x20 [<ffffffff83aa5a61>] ? sockfd_lookup_light+0x21/0x230 [<ffffffff83aaa086>] ? SYSC_sendto+0x166/0x240 [<ffffffff811561d2>] ? syscall_trace_enter_phase2+0x2f2/0x640 [<ffffffff83aac57e>] ? SyS_sendto+0xe/0x10 [<ffffffff845cb778>] ? tracesys_phase2+0xd8/0xdd [9]kdb> rd ax: 0000000000000087 bx: ffff8803c086ed00 cx: 0000000000000000 dx: 1ffffffff0a51c6b si: 1ffffffff0a51c6b di: ffffffff81391731 bp: ffff8805318ab528 sp: ffff8805318ab4b8 r8: ffffffff8528e415 r9: 0000000000000000 r10: ffffe8fff0a51c80 r11: 0000000000000007 r12: ffffffff849a5420 r13: 00000000000000c0 r14: 0000000000000064 r15: ffff8803bd804ebc ip: ffffffff83abddc4 flags: 00010296 cs: 00000010 ss: 00000018 ds: 00000018 es: 00000018 fs: 00000018 gs: 00000018 ONFIG_KASAN_INLINE enabled 0GPF could be caused by NULL-ptr deref or user memory access 2KGDB: re-enter exception: ALL breakpoints killed 0CONFIG_KASAN_INLINE enabled 0GPF could be caused by NULL-ptr deref or user memory access dCPU: 9 PID: 14150 Comm: trinity-c9 Tainted: G B W I 3.18.0-rc1+ #8 dHardware name: Dell Inc. Precision WorkStation T3500 /09KPNV, BIOS A08 09/16/2010 ffff8805318aacb8 00000000ea01fa3d 0000000000000000 00000000000003e8 ffff8805318aaa68 ffffffff845b35bb 1ffffffff0a512a4 ffffffff852ddd00 ffff8805318aab08 ffffffff81459b3d ffff880500000000 ffffffff811394e5 Call Trace: [<ffffffff845b35bb>] dump_stack+0x4f/0x7c [<ffffffff81459b3d>] kgdb_handle_exception+0x34d/0x360 [<ffffffff811394e5>] ? show_stack_log_lvl+0x1f5/0x480 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff811daa69>] kgdb_notify+0x39/0x80 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff81307c2d>] notify_die+0x3d/0x60 [<ffffffff81134b45>] do_general_protection+0x225/0x3c0 [<ffffffff845cd5e8>] general_protection+0x28/0x30 [<ffffffff811394e5>] ? show_stack_log_lvl+0x1f5/0x480 [<ffffffff81139325>] ? show_stack_log_lvl+0x35/0x480 [<ffffffff814640d9>] ? kdbgetaddrarg+0x559/0x850 [<ffffffff8113b84d>] show_stack+0x3d/0x100 [<ffffffff8146bf22>] kdb_show_stack+0xb2/0x1c0 [<ffffffff8146c6ee>] kdb_bt+0x56e/0x8b0 [<ffffffff8145e7c0>] ? kdb_printf+0x50/0x70 [<ffffffff8146700b>] kdb_parse+0x67b/0xf80 [<ffffffff8146827c>] kdb_main_loop+0x69c/0x9f0 [<ffffffff8146e9d0>] kdb_stub+0x6b0/0x1230 [<ffffffff81458dc9>] kgdb_cpu_enter+0x569/0xce0 [<ffffffff81459ab9>] kgdb_handle_exception+0x2c9/0x360 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff811daa69>] kgdb_notify+0x39/0x80 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff81307c2d>] notify_die+0x3d/0x60 [<ffffffff81133acf>] do_error_trap+0x5f/0x1b0 [<ffffffff845c1682>] ? preempt_schedule+0x62/0xa0 [<ffffffff81f29d44>] ? ___preempt_schedule+0x35/0x37 [<ffffffff81f29d0a>] ? trace_hardirqs_off_thunk+0x3a/0x3f [<ffffffff81134620>] do_invalid_op+0x20/0x30 [<ffffffff845cd09e>] invalid_op+0x1e/0x30 [<ffffffff845aea2a>] ? printk+0xa8/0xc3 [<ffffffff81391731>] ? vprintk_emit+0x341/0x720 [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83cff03e>] ? ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac4551>] skb_push+0xc1/0x100 [<ffffffff83cff03e>] ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac8410>] ? __skb_checksum+0x110/0x730 [<ffffffff81604c92>] ? kmem_cache_free+0x1d2/0x210 [<ffffffff8437cf91>] sctp_v4_xmit+0x101/0x1a0 [<ffffffff843d5ba2>] sctp_packet_transmit+0xf32/0x2050 [<ffffffff8438fb8c>] ? sctp_chunkify+0x4c/0x2a0 [<ffffffff81622c64>] ? kasan_poison_shadow+0x34/0x40 [<ffffffff843d2a50>] ? sctp_csum_combine+0x20/0x20 [<ffffffff843d2a30>] ? sctp_packet_release_owner+0x50/0x50 [<ffffffff843a6dde>] sctp_outq_flush+0x6ee/0x2fa0 [<ffffffff81326b7f>] ? preempt_count_add+0x16f/0x1b0 [<ffffffff843ad8dd>] sctp_outq_uncork+0x6d/0x90 [<ffffffff84378765>] sctp_do_sm+0x2c25/0x4a40 [<ffffffff83ce2630>] ? __ip_route_output_key+0xa50/0x2830 [<ffffffff83e99011>] ? xfrm_lookup_route+0x21/0x100 [<ffffffff83ce5369>] ? ip_route_output_flow+0x69/0x90 [<ffffffff82305052>] ? extract_entropy+0xa2/0x230 [<ffffffff8437d7ff>] ? sctp_v4_get_dst+0x65f/0x1040 [<ffffffff843d2584>] sctp_primitive_ASSOCIATE+0x84/0xd0 [<ffffffff843c4ad6>] sctp_sendmsg+0x15b6/0x29b0 [<ffffffff81530000>] ? toggle_bp_slot.constprop.11+0x1d0/0x530 [<ffffffff81544636>] ? generic_perform_write+0x266/0x450 [<ffffffff83dda011>] inet_sendmsg+0x231/0x360 [<ffffffff83aa9e94>] sock_sendmsg+0xc4/0x150 [<ffffffff81681ab3>] ? __fdget+0x13/0x20 [<ffffffff83aa5a61>] ? sockfd_lookup_light+0x21/0x230 [<ffffffff83aaa086>] SYSC_sendto+0x166/0x240 [<ffffffff811561d2>] ? syscall_trace_enter_phase2+0x2f2/0x640 [<ffffffff83aac57e>] SyS_sendto+0xe/0x10 [<ffffffff845cb778>] tracesys_phase2+0xd8/0xdd 0Kernel panic - not syncing: Recursive entry to debugger dCPU: 9 PID: 14150 Comm: trinity-c9 Tainted: G B W I 3.18.0-rc1+ #8 dHardware name: Dell Inc. Precision WorkStation T3500 /09KPNV, BIOS A08 09/16/2010 ffff8805318aacb8 00000000ea01fa3d 0000000000000000 00000000000003e8 ffff8805318aa9e8 ffffffff845b35bb 1ffffffff0a51c00 ffffffff84b62959 ffff8805318aaa68 ffffffff845ae6ed ffff880300000008 ffff8805318aaa78 Call Trace: [<ffffffff845b35bb>] dump_stack+0x4f/0x7c [<ffffffff845ae6ed>] panic+0x168/0x2c3 [<ffffffff81459b50>] kgdb_handle_exception+0x360/0x360 [<ffffffff811394e5>] ? show_stack_log_lvl+0x1f5/0x480 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff811daa69>] kgdb_notify+0x39/0x80 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff81307c2d>] notify_die+0x3d/0x60 [<ffffffff81134b45>] do_general_protection+0x225/0x3c0 [<ffffffff845cd5e8>] general_protection+0x28/0x30 [<ffffffff811394e5>] ? show_stack_log_lvl+0x1f5/0x480 [<ffffffff81139325>] ? show_stack_log_lvl+0x35/0x480 [<ffffffff814640d9>] ? kdbgetaddrarg+0x559/0x850 [<ffffffff8113b84d>] show_stack+0x3d/0x100 [<ffffffff8146bf22>] kdb_show_stack+0xb2/0x1c0 [<ffffffff8146c6ee>] kdb_bt+0x56e/0x8b0 [<ffffffff8145e7c0>] ? kdb_printf+0x50/0x70 [<ffffffff8146700b>] kdb_parse+0x67b/0xf80 [<ffffffff8146827c>] kdb_main_loop+0x69c/0x9f0 [<ffffffff8146e9d0>] kdb_stub+0x6b0/0x1230 [<ffffffff81458dc9>] kgdb_cpu_enter+0x569/0xce0 [<ffffffff81459ab9>] kgdb_handle_exception+0x2c9/0x360 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff811daa69>] kgdb_notify+0x39/0x80 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff81307c2d>] notify_die+0x3d/0x60 [<ffffffff81133acf>] do_error_trap+0x5f/0x1b0 [<ffffffff845c1682>] ? preempt_schedule+0x62/0xa0 [<ffffffff81f29d44>] ? ___preempt_schedule+0x35/0x37 [<ffffffff81f29d0a>] ? trace_hardirqs_off_thunk+0x3a/0x3f [<ffffffff81134620>] do_invalid_op+0x20/0x30 [<ffffffff845cd09e>] invalid_op+0x1e/0x30 [<ffffffff845aea2a>] ? printk+0xa8/0xc3 [<ffffffff81391731>] ? vprintk_emit+0x341/0x720 [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83cff03e>] ? ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac4551>] skb_push+0xc1/0x100 [<ffffffff83cff03e>] ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac8410>] ? __skb_checksum+0x110/0x730 [<ffffffff81604c92>] ? kmem_cache_free+0x1d2/0x210 [<ffffffff8437cf91>] sctp_v4_xmit+0x101/0x1a0 [<ffffffff843d5ba2>] sctp_packet_transmit+0xf32/0x2050 [<ffffffff8438fb8c>] ? sctp_chunkify+0x4c/0x2a0 [<ffffffff81622c64>] ? kasan_poison_shadow+0x34/0x40 [<ffffffff843d2a50>] ? sctp_csum_combine+0x20/0x20 [<ffffffff843d2a30>] ? sctp_packet_release_owner+0x50/0x50 [<ffffffff843a6dde>] sctp_outq_flush+0x6ee/0x2fa0 [<ffffffff81326b7f>] ? preempt_count_add+0x16f/0x1b0 [<ffffffff843ad8dd>] sctp_outq_uncork+0x6d/0x90 [<ffffffff84378765>] sctp_do_sm+0x2c25/0x4a40 [<ffffffff83ce2630>] ? __ip_route_output_key+0xa50/0x2830 [<ffffffff83e99011>] ? xfrm_lookup_route+0x21/0x100 [<ffffffff83ce5369>] ? ip_route_output_flow+0x69/0x90 [<ffffffff82305052>] ? extract_entropy+0xa2/0x230 [<ffffffff8437d7ff>] ? sctp_v4_get_dst+0x65f/0x1040 [<ffffffff843d2584>] sctp_primitive_ASSOCIATE+0x84/0xd0 [<ffffffff843c4ad6>] sctp_sendmsg+0x15b6/0x29b0 [<ffffffff81530000>] ? toggle_bp_slot.constprop.11+0x1d0/0x530 [<ffffffff81544636>] ? generic_perform_write+0x266/0x450 [<ffffffff83dda011>] inet_sendmsg+0x231/0x360 [<ffffffff83aa9e94>] sock_sendmsg+0xc4/0x150 [<ffffffff81681ab3>] ? __fdget+0x13/0x20 [<ffffffff83aa5a61>] ? sockfd_lookup_light+0x21/0x230 [<ffffffff83aaa086>] SYSC_sendto+0x166/0x240 [<ffffffff811561d2>] ? syscall_trace_enter_phase2+0x2f2/0x640 [<ffffffff83aac57e>] SyS_sendto+0xe/0x10 [<ffffffff845cb778>] tracesys_phase2+0xd8/0xdd 0Shutting down cpus with NMI PANIC: Recursive entry to debugger dCPU: 9 PID: 14150 Comm: trinity-c9 Tainted: G B W I 3.18.0-rc1+ #8 dHardware name: Dell Inc. Precision WorkStation T3500 /09KPNV, BIOS A08 09/16/2010 ffff88053f528f58 00000000ea01fa3d 0000000000000000 00000000000003e8 ffff88053f528de8 ffffffff845b35bb 1ffff100a7ea51fb ffffffff852ddd00 ffff88053f528e88 ffffffff81459b3d ffff88053f528e68 ffffffff81459f83 Call Trace: <#DB> [<ffffffff845b35bb>] dump_stack+0x4f/0x7c [<ffffffff81459b3d>] kgdb_handle_exception+0x34d/0x360 [<ffffffff81459f83>] ? kgdb_breakpoint+0x13/0x20 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff81307c2d>] ? notify_die+0x3d/0x60 [<ffffffff811dab26>] kgdb_ll_trap+0x76/0xa0 [<ffffffff81134d73>] do_int3+0x93/0x210 [<ffffffff845cd4da>] int3+0x3a/0x50 [<ffffffff81459f84>] ? kgdb_breakpoint+0x14/0x20 <<EOE>> [<ffffffff8145a029>] kgdb_panic_event+0x29/0x30 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff845ae73d>] panic+0x1b8/0x2c3 [<ffffffff81459b50>] kgdb_handle_exception+0x360/0x360 [<ffffffff811394e5>] ? show_stack_log_lvl+0x1f5/0x480 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff811daa69>] kgdb_notify+0x39/0x80 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff81307c2d>] notify_die+0x3d/0x60 [<ffffffff81134b45>] do_general_protection+0x225/0x3c0 [<ffffffff845cd5e8>] general_protection+0x28/0x30 [<ffffffff811394e5>] ? show_stack_log_lvl+0x1f5/0x480 [<ffffffff81139325>] ? show_stack_log_lvl+0x35/0x480 [<ffffffff814640d9>] ? kdbgetaddrarg+0x559/0x850 [<ffffffff8113b84d>] show_stack+0x3d/0x100 [<ffffffff8146bf22>] kdb_show_stack+0xb2/0x1c0 [<ffffffff8146c6ee>] kdb_bt+0x56e/0x8b0 [<ffffffff8145e7c0>] ? kdb_printf+0x50/0x70 [<ffffffff8146700b>] kdb_parse+0x67b/0xf80 [<ffffffff8146827c>] kdb_main_loop+0x69c/0x9f0 [<ffffffff8146e9d0>] kdb_stub+0x6b0/0x1230 [<ffffffff81458dc9>] kgdb_cpu_enter+0x569/0xce0 [<ffffffff81459ab9>] kgdb_handle_exception+0x2c9/0x360 [<ffffffff811da77e>] __kgdb_notify+0x10e/0x3c0 [<ffffffff811daa69>] kgdb_notify+0x39/0x80 [<ffffffff813064b2>] notifier_call_chain+0xc2/0x130 [<ffffffff81306917>] atomic_notifier_call_chain+0x37/0x50 [<ffffffff81307c2d>] notify_die+0x3d/0x60 [<ffffffff81133acf>] do_error_trap+0x5f/0x1b0 [<ffffffff845c1682>] ? preempt_schedule+0x62/0xa0 [<ffffffff81f29d44>] ? ___preempt_schedule+0x35/0x37 [<ffffffff81f29d0a>] ? trace_hardirqs_off_thunk+0x3a/0x3f [<ffffffff81134620>] do_invalid_op+0x20/0x30 [<ffffffff845cd09e>] invalid_op+0x1e/0x30 [<ffffffff845aea2a>] ? printk+0xa8/0xc3 [<ffffffff81391731>] ? vprintk_emit+0x341/0x720 [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83abddc4>] ? skb_panic+0x154/0x220 [<ffffffff83cff03e>] ? ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac4551>] skb_push+0xc1/0x100 [<ffffffff83cff03e>] ip_queue_xmit+0x12e/0x16d0 [<ffffffff83ac8410>] ? __skb_checksum+0x110/0x730 [<ffffffff81604c92>] ? kmem_cache_free+0x1d2/0x210 [<ffffffff8437cf91>] sctp_v4_xmit+0x101/0x1a0 [<ffffffff843d5ba2>] sctp_packet_transmit+0xf32/0x2050 [<ffffffff8438fb8c>] ? sctp_chunkify+0x4c/0x2a0 [<ffffffff81622c64>] ? kasan_poison_shadow+0x34/0x40 [<ffffffff843d2a50>] ? sctp_csum_combine+0x20/0x20 [<ffffffff843d2a30>] ? sctp_packet_release_owner+0x50/0x50 [<ffffffff843a6dde>] sctp_outq_flush+0x6ee/0x2fa0 [<ffffffff81326b7f>] ? preempt_count_add+0x16f/0x1b0 [<ffffffff843ad8dd>] sctp_outq_uncork+0x6d/0x90 [<ffffffff84378765>] sctp_do_sm+0x2c25/0x4a40 [<ffffffff83ce2630>] ? __ip_route_output_key+0xa50/0x2830 [<ffffffff83e99011>] ? xfrm_lookup_route+0x21/0x100 [<ffffffff83ce5369>] ? ip_route_output_flow+0x69/0x90 [<ffffffff82305052>] ? extract_entropy+0xa2/0x230 [<ffffffff8437d7ff>] ? sctp_v4_get_dst+0x65f/0x1040 [<ffffffff843d2584>] sctp_primitive_ASSOCIATE+0x84/0xd0 [<ffffffff843c4ad6>] sctp_sendmsg+0x15b6/0x29b0 [<ffffffff81530000>] ? toggle_bp_slot.constprop.11+0x1d0/0x530 [<ffffffff81544636>] ? generic_perform_write+0x266/0x450 [<ffffffff83dda011>] inet_sendmsg+0x231/0x360 [<ffffffff83aa9e94>] sock_sendmsg+0xc4/0x150 [<ffffffff81681ab3>] ? __fdget+0x13/0x20 [<ffffffff83aa5a61>] ? sockfd_lookup_light+0x21/0x230 [<ffffffff83aaa086>] SYSC_sendto+0x166/0x240 [<ffffffff811561d2>] ? syscall_trace_enter_phase2+0x2f2/0x640 [<ffffffff83aac57e>] SyS_sendto+0xe/0x10 [<ffffffff845cb778>] tracesys_phase2+0xd8/0xdd
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